Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. इंटरनेट मानक “!ान $ एक न’ भारत का +नम-ण” Satyanarayan Gangaram Pitroda “Invent a New India Using Knowledge” “प0रा1 को छोड न’ 5 तरफ” Jawaharlal Nehru “Step Out From the Old to the New” “जान1 का अ+धकार, जी1 का अ+धकार” Mazdoor Kisan Shakti Sangathan “The Right to Information, The Right to Live” “!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता ह ै” Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” IS 3028 (1998): Automotive Vehicles - Noise Emitted by Moving Vehicles - Method of Measurement [TED 4: Automotive Braking Systems]
Transcript
Disclosure to Promote the Right To Information
Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.
इंटरनेट मानक
“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda
“Invent a New India Using Knowledge”
“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru
“Step Out From the Old to the New”
“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan
“The Right to Information, The Right to Live”
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”
“Invent a New India Using Knowledge”
है”ह”ह
IS 3028 (1998): Automotive Vehicles - Noise Emitted byMoving Vehicles - Method of Measurement [TED 4: AutomotiveBraking Systems]
IS 3028:1998
itm?a7—
( wwl~-@oIndian Standard
AUTOMOTIVE VEHICLES — NOISE EMITTEDBY MOVING VEHICLES — METHOD OF
MEASUREMENT
(Second Revision)
ICS 17.140.30
0 BIS 1998
BUREAU OF IN DIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
December 1998 Price Group 7
Automotive Vehicle Testing and Performance Evaluation Sectional Committee, TED 8
FOREWORD
This Indian Standard (Second Revision) was adopted by the Bureau of Indian Standards, after the draft finalizedby the Automotive Vehicle Testing and Performance Evaluation Sectional Committee had been approved bythe Transport Engineering Division Council.
This standard was first revised in 1980 to incorporate the changes in accordance with latest ISO standards onthe subject. In view of the growing noise pollution, it has necessitated the Government to laydown limits fordifferent categories of vehicles in Central Motor Vehicle Rules (CMVR). Hence, the limits are not specified inthe standard. The standard is now being revised to bring it in line with the procedures outlined in the latest EECdirectives.
While revising the standard considerable assistance has been derived from the following:
971241EC
70/ 157/EEc
IEC 651:1993
1S0 10534-1:1996
1S0 10534-2:1996
1S0 10844:1994
Permissible sound level and exhaust system of Two or Three-wheel motor vehicles
Amended by Directive 96/20iEC
Sound level meters
Acoustics — Determination of sound absorption coefficient and impedence inimpedence tubes Part 1: Method using standing wave ratio
Acoustics — Determination of sound absorption coefficient and impedence inimpedence tubes Part 2: Method using two microphones
Acoustics — Specification for test tracks for the purpose of measuring noise emittedby road vehicles
The noise emitted by stationary used vehicles is covered separately by IS 10399:1998 ‘Automotive vehicles— Noise emitted by stationary vehicles — Method of measurement (@@ revision)’.
The composition of the committee responsible for preparation of this standard is given in Annex E.
For the purpose of deciding whether a particular requirement of this standard is complied with, the final value,observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance withIS 2: 1960 ‘Rules for rounding off numerical values (revised)’. The number of significant places retained inthe rounded off value should be the same that of the specified value in this standard.
IS 3028:1998
Indian Standard
AUTOMOTIVE VEHICLES — NOISE EMITTEDBY MOVING VEHICLES — METHOD OF
MEASUREMENT
(Second Revision)
1 SCOPE
This standard specifies the method for measuring theexternal noise emitted by road vehicles in movingcondition.
2 REFERENCES
The following standards contain provisions whichthrough reference in this text, constitute provision ofthis standard. At the time of publication, the editionsindicated were valid. All standards are subject torevision, and parties to agreements based on thisstandard are encouraged to investigate the possibilityof applying the most recent editions of the standardsindicated below:
IS No.
9211:1979
9726:1984
9779:1981
11422:
. .14272(Part 1
986
:1995
Title
Denominations and definitions ofweights of road vehicles
Terms and definitions of weights ofmopeds (first revision)
Sound level meters
Terms and definitions of weights ofscooters and motorcycles
Automotive vehicles — Types —Terminology: Part 1 Three and fourwheelers
3 TECHNICAL CHARACTERISTICS OF THEVEHICLE
3.1 Technical characteristics of the vehicle as relevantto noise performance, shall be declared by vehiclemanufacturer and shall contain atleast the details givenin Annex A.
NOTE — If the specifications submitted for complete typeapproval of a vehicle contain the details given in Annex A, thereis no necessity of submitting this information again.
,3.2 Modifications/Changes in TechnicalCharacteristics
3.2.1 In case test is conducted for verification ofcompliance to statutory requirement the followingshall be carried out.
3.2.2 Every functional modification pertaining totechnical characteristics of noise performance ofvehicle declared in accordance with 3.1 shall beintimated to the testing agency. Testing agency maythen consider, whether the vehicle with modificationscomplies with specified performance requirements; orany further testing is required. For consideringwhether testing is required or not, guidelines given inAnnex B shall be followed.
After successful compliance to the performancerequirements, if needed, the earlier test results shall bevalidated for the modifications/changes also. Theseconditions are applicable irrespective of any change incommercial name of the model.
4 INSTRUMENTATION
4.1 Acoustic Measurements
The apparatus used for measuring the noise level shallbe a sound-level meter of the type described inIS 9779 or the equivalent IEC publication and themeasurements shall be carried out using the fastresponse of the sound-level meter and the ‘A’weighting curve which are also described in thatpublication. The frontal mode of operation of thesound-level meter shall be used. At the beginning andend of each set of measurements, the sound-levelmeter shall be calibrated according to the instructionsgiven by the manufacturer of the instrument, bymeans of an appropriate sound source such as pistonphone. The test shall be considered invalid, if thesound-level meter errors registered during thesecalibrations exceed 1 dB.
4.2 Speed Measurementsm, . ..— >... 2.. -1-! -1-. —-- J__.LA1IEeng:ne Speeu 2UKI VC[l IUC SpCUJ W 111~testSeC[lonshall be determined to within f 3 percent by thesuitable instrumentation.
5 CONDITIONS OF MEASUREMENT
5.1 Test Site
The test site shall consist of a central accelerationsection surrounded by a substantially flat test area.The test acceleration section shall be level; the track
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IS 3028:1998
surface shall be dry and such that rolling noiseremains low. The test site shall be such that thevariations in the free sound field between the soundsource at the centre of the acceleration section and themicrophone are within 1 dB (A). These conditionsshall be deemed to have been met, if there are no largesound-reflecting objects such as fences, rocks, bridgesor buildings within 50 metres radius of the centre ofthe acceleration section. The test-track surface shallcomply with the requirements specified in Annex C.There shall be no obstacle that affects the sound fieldwithin the vicinity of the microphone and no personshall stand between the microphone and the soundsource. The observer carrying out the measurementshall so position himself as not to affect the readingsof the measuring instrument.
5.2 Meteorological Conditions
The measurement shall not be made in adverseweather conditions such as rain, storm and heavywinds that would affect noise, instruments and testresults.
5.3 Ambient Noise
For measurements, the A-weighted sound level ofsound sources other than those of the vehicle to betested and of wind effects shall be at least 10 dB (A)below the sound level produced by the vehicle. Asuitable windscreen shall be fitted to the microphoneprovided that care is taken of its effect on thesensitivity and directional characteristics of themicrophone. If the difference between the ambientnoise and the measured noise is between 10 and 16dB (A), in order to calculate the test results anappropriate correction shall be subtracted from thereadings on the sound level meter, as shown in Fig. 1.
dB(A’
0.4
O*3
0.2
0.1
0CJ
-’v-
6 PREPARATION OF THE VEHICLE
6.1 The vehicle shall conform in all its parts,components and systems to the design andlorproduction series as applicable.
6.2 Prior to test, the vehicle shall be run-in asrecommended by the manufacturer.
6.3 The vehicle’s tyres shall be of the type normallyfitted to such vehicles by the manufacturer. Tyres thathave covered only 10 percent or less of their expectedlife shall be fitted on the veh:cle.
6.4 The tyres shall be inflated to the appropriatepressure(s) for the load condition prescribed for thetest as specified by the vehicle manufacturer.
6.5 Before the measurements are obtained, the engineshall be brought to its normal operating condition withregard to temperatures, settings, fuel, spark plugs,carburetor, etc.
6.6 If the vehicle is fitted with fan(s) having anautomatic actuating mechanism, this system shall notbe interfered duringthe’measurements.
6.7 Prior to testing it shall be ensured that the vehicleis in running order as defined for the kerb weightcondition, and with the test driver/rider. The kerbweight condition shall be the same as defined inIS 9211, IS 9726, IS 11422 as appropriate. In the caseof two and three wheelers the combined weight of therider and the test equipment used on the vehicle shallbe within 80 * 10 kg. If necessary additional weightsmay be added to the vehicle to meet this requirement.
6.8 If the vehicle is designed to be attached withtrailer or semi-frailer, they shall be uncoupled except
I dB(A)
11 12 13 14 15 16
FIG.1 DIFFERENCE BETWEEN AMBIENT NOISEAND NOISETO BE MEASURED
2
in the case of vehicles where trailer or semi-trailercannot be uncoupled.
6.9 Only the normal highway drive shall reengagedin vehicle with more than two drive wheels
6.10 Incaseoftwo wheelers fitted withasidecar, theside car shall be detached.
6.11 The test shall be carried out on fully builtvehicles where applicable including cabin and loadbody or on a drive away chassi$ on manufacturer’srequest. If the manufacturer so desires the drive awaychassis may be loaded according to Table 1 below tocompensate the weight of the cab and load body.
Table 1 Load Schedule
GrossVehicleWeightin Tonne (t)
(1)
Below 33and above
but less than 44 and above
but less than 66 and above
but less than 1010 and above
CabWeightin Tonne(t)
(2)
Not applicableNot applicable
Not applicable
0.40
0.40
BodyWeightin Tonne(t)
(3)
0.120.20
0.40
0.70
1,00
IS 3028:1998
7 METHOD OF MEASUREMENT
7.1 Nature and Number of Measurements
The maximum sound level expressed in A-weighteddecibels [dB(A)] shall be measured as the vehicle isdriven between lines AA’ and BB’ (Fig. 2). Themeasurement shall be invalid if an abnormaldiscrepancy between the peak value and the generalsound level is recorded. At least two measurementsshall be taken on each side of the vehicle. Themeasurements are considered valid if the difference ‘between two consecutive measurements on the sameside of the vehicle does not exceed 2 dB (A).
7.2 Positioning of the Microphone
The microphone shall be located at a distance of 7.5+ 0.2 m from the reference line CC’ (Fig. 2) of thetrack and 1.2 t 0.1 m above the ground. Its axis ofmaximum sensitivity shall be horizontal andperpendicular to the path of the vehicle (line CC’).
7.3 Operating Conditions
7.3.1 For all measurements, the vehicle shall bedriven in a straight line over the acceleration sectionin such a way that the median longitudinal plane ofthe vehicle is as close as possible to the line CC’.
c’I
B bi B’
Eyo+1 I
I
I
‘T’Ic
FIG.2 POSITIONFOR TESTINGTHEVEHICLEINMOTION
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1S 3028:1998
7.3.2 The vehicle shall approach the line AA’ at asteady approach speed as specified in 8, with the gearengaged as per 9. When the front end of the vehiclehas reached the lineAA’, the accelerator control is fullyoperated as rapidly and smoothly as possible and heldin the fully opened position until the rear of thevehicle reaches the line BB’; the accelerator controlshall be released as quickly as possible. The trailers ofarticulated vehicles which cannot be uncoupled shallnot be taken into account with regard to crossing ofline BB’.
8 APPROACH SPEED
8.1 For two wheelers with maximum design speednot exceeding 45 km/h and if fitted with a thermicengine, engine capacity not exceeding 50cc.
The approach speed shall be 30 km/h or top speed, ifthis is less than 30 km/h.
8.2 For All Other Two Wheelers
8.2.1 Vehicle with Manual Shiji Gear Box
The approach speed shall be the lowest of thefollowing:— 50 kmlh.
speed corresponding to an engine rpm equal to75 percent of the engine rpm at whichmaximum rated power is developed.speed corresponding to an engine rpm equal to75 percent of the maximum engine rpm permittedby the governor.
8.2.2 Vehicle with Automatic Gear Box
a)
b)
Vehicle without a manual selector or with
fixed transmission ratio
The tests shall be carried out at approach
speeds of 30, 40 and 50 km/h. If any of theabove speeds exceed 75 percent of maximumdesign speed the test need not be conducted forthose speeds (see 11.4).
Vehicle equipped with manual selector with‘X’ forward drive positions
The approach speed shall be as per 8.2.1. How-ever, during the test at an approach speed of50 krnlh, the kick down occurs, the approachspeed of the vehicle may be increased to amaximum of 60 km/h to avoid the kick down.
8.3 For Three Wheelers
a)
b)
For vehicles with fixed transmission ratio orwith manual shift gear box the approach speedshall be as given in 8.2.1.For vehicle with automatic gear box the ap-proach speed shall be 50 kmlh or three-quarters of its maximum design speed,whichever is the lowest.
8.4 For Four Wheelers and Multi-Axle Vehicles
8.4.1 The approach speed shall be that correspondingLOthe lower of the following two speeds:— 50 km /h.— The speed corresponding to an engine speed equal
to three-quarters of the speed (S) at which theengine develops its rated maximum power, in thecase of vehicles of category Ml and in the case ofvehicles of the other categories having an enginepower not greater than 225 kW.
— The speed corresponding to an engine speed equalto half the speed (S) at which the engine developsits rated maximum power, in the case of vehiclesnot belonging to category M 1 having an enginepower greater than 225 kW.
8.4.2 However, if in the case of vehicles equippedwith an automatic transmission having more than twodiscrete ratios there is a possibility for change-downto first gear during the test. In such cases themanufacturer may select either of the following testprocedures:— The speed (S) of the vehicle is increased to a
maximum of 60 kfi in order to avoid such achange-down, or
— The speed (S) shall remain at 50 km/h and fuelsupply to the engine limited to 95 percent of thesupply necessary for full load. This condition isconsidered to be satisfied:— In the case of a spark-ignition engine, when
the angle of the throttle opening is 90 percent,and
— In the case of a compression-ignition engine,when the movement of the central rack of theinjection pump is limited to 90 percent of itstravel.
8.4.3 If the vehicle is equipped with an automatictransmission that has no manual override, it shall betested at different approach speeds, such as 30,40 and50 krrdh, or at three-quarters of maximum road speedin case this value is lower.
9 SELECTION OF GEAR RATIOS
9.1 For Two Wheelers (with Maximum DesignSpeed not Exceeding 45 krnh and if Fitted with aThermic Engine with Capacity not Exceeding50 cc)
If the velicle is fitted with a manual-shift gearbox thehighest gear which allows it to cross line AA’ with atleast half the full-power engine rpm shall be selected.
9.2 For All Other Two Wheelers
9.2.1 Vehicle with Manual Shijl Gear Box
9.2.1.1 Vehicle fitted with a gear box having amaximum of four ratios, shall be tested only in second
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IS 3028:1998
gear, whatever may be the cylinder capacities subjectto 9.2.1.4.
9.2.1.2 Vehicles fitted withengineshaving acylindercapacity not exceeding 175 cc and a gearbox withfive or more ratios shall be tested only in third gear.
9.2.1.3 Vehicles tittedwith engines having acylindercapacity of more than 175 cc and a gear box with fiveor more ratios shall be tested once in second gear andonce in third gear, subject to 9.2.1.4 (see 11.2).
9.2.1.4 If during the test in second gear (see 9.2.1.1and 9.2.1.3), the engine speed on the approach to theline marking the end of the test area (at the line Bl?’)exceeds 100 percent of the speed at which the enginedevelops rated maximum power, the test shall beperformed in third gear (see 11.3).
9.3 For Three Wheelers
9.3.1 Vehicle with Manual Shifi Gear Box
If the vehicle is fitted with gear box with two, three orfour ratios, second gear shall be used. If the gear boxhas more than four ratios, third gear shall be used. Ifthe engine reaches a speed of rotation beyond itsmaximum power at a line BB’, instead of second orthird gear the next higher gear shall be engaged toreach line BB’ on the test track without exceeding thisengine speed. Over drive shall not be selected, duringthe test. If the vehicle has a dual ratio final drive, theratio selected shall be that corresponding to that ofhighest speed of the vehicle.
9.3.2 Vehicle with Automatic Gear Box
Where several forward drive positions are available,the position that produces highest average accelerationof the vehicle between lines AA’ and BB’ shall beselected. The selector position used for braking,maneuvering or similar slow movements shall not beused.
9.4 For Four Wheelers
9.4.1 Choice of Gear Ratios (for Vehicles Fitted withGear Boxes)
9.4.1.1 Manually-operated, non-automatic gear box
a) The category M 1 and N 1 vehicles equippedwith a manually operated gear box having fouror less forward gear ratios shall be tested insecond gear. Vehicles in these categoriesequipped with a manually operated gear boxhaving more than four forward gear ratios shallbe tested in second and third gears successive-ly. Only overall gear ratios intended for normalroad usage shall be considered. The arithmeticmean of the sound levels recorded for each ofthese two conditions shall be calculated.
i) If during the test in second gear, theengine speed exceeds the engine speed
(S) at which the engine develops its ratedmaximum power, the test shall berepeated with an approach speed andlorapproach engine speed reduced in stepsof 5 percent of S until the engine speedattained no longer exceeds S. If the en-gine speed ‘S’ is still attained with anapproach engine speed corresponding tothe idle speed, then the test shall beperformed only in the third gear and therelevant results shall be evaluated.
ii) However, the vehicles in category M 1having more than four forward gears andequipped with an engine developing amaximum power greater than 140 kW,and whose permissible maximumpower/maximum mass ratio exceeds75 kW/t, may be tested in third gear only,provided that the speed at which the rearof the vehicle passes the line BB’ in thirdgear is greater than61 ktnh.
NOTE — The category of vehicles such as M 1and N 1are defined in 1S 14272 (Pml1).
b) Vehicle categories other than Ml and N i inwhich the total number of forward gear ratio isx ( including the ratios obtained by means ofan auxiliary gear box or a multi-ratio driveaxle) shall be tested using, in turn, ratios equalto or higher than X/n, where:
i) n=2, for vehicles having an enginepower not greater than 225 kW;
ii) n=3, for vehicles having an enginepower greater than 225 kW.
If tin does not correspond to a whole number,the nearest higher gear ratio shall be used.The test results shall be those obtained fromthe ratio producing maximum sound level.Shifting of gears from tin shall be terminated in ‘‘the gear X where the engine speed (S) at whichthe engine develops its rated maximum powerand is reached earlier while passing the line BB’.In case of vehicles having different overallgear ratios (including a different number ofgears) the representative type of the testvehicle shall be determined as follows:—
—
—
If the highest sound level is obtainedbetween the ratio tin and X the vehicleselected is deemed to be the representativeof this type,If the highest sound level is obtained atratio tin the vehicle selected is deemedrepresentative of its type only for thosevehicles which have a lower overall gearratio at tin, andIf the highest sound level is obtained atratio X the vehicle selected is deemed tobe the representative of this type only for
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IS 3028:1998
9.4.1.2
‘ those vehicles which haveahigheroverallgear ratio at X.
However, the vehicle is deemed to be the rep-resentative of this type also, if, at the requestof”the vehicle manufacturer, the tests are ex-tended over more ratios than foreseen, and thehighest sound level is obtained between theextreme ratios test.
The test is conducted with the selector in a positionrecommended by the manufacturer for normal driving.External downshifts (for example, kick down) shall beput out of operation
10 INTERPRETATION OF RESULTS
10.1 In order to take into account the inaccuracies inthe measuring instruments, the result obtained fromeach measurement is determined by deducting1 dB (A) from the meter reading.
10.2 Correction of Results for DifferentCategories of Vehicles
10.2.1 For vehicles of category M2, with GVW notexceeding 3.5 tonnes, and in categories M 1 and N1,the values obtained as per 10.1, shall be reduced by 1dB(A) if they are equipped with a direct injectiondiesel engine,
10.2.2 For vehicles with maximum permissiblemass of over two tonnes designed for off-road use,the values obtained as per 10.1, shall be reduced by 1dB (A) if their engine power is less than 150 kW and2 dB (A), if their engine power is 150 kW or more.
10.2,3 For Ml category of vehicles, equipped with amanually operated gear box having more than fourforward gears and with an engine developing amaximum power exceeding 140 kW/t and whosepermissible maximum power/maximum mass ratioexceeds 75 kW/t the values obtained as per 10.1, shallbe reduced by 1 dB (A) if the speed at which the rearof the vehicle passes the line BB’ (Fig. 1) in third gearis greater than 61 km/h.
11 FINAL RESULTS OF TEST
11.1 The arithmetic average of the four results of the “measurements as per 7.1, corrected and valid asper 10.1 rounded off to the nearest decibel shallconstitute the final result of the test.
11.2 In the case of 9.2.1.3 (subject to 9.2.1.4) theaverage of tlnal results of tests once in second gearand once in third gear shall be constituted as the endresult,
11.3 In case of 9.2.1.4 the final result of the testconducted in third gear only shall be constituted as theend result.
11.4 In case of 8.2.2 (a) and 8.4.3 the values obtainedduring each test with different approach speeds shallbe interpreted in accordance with 10.1 and their finalresult as per 11.1 shall be calculated. The highest ofthe reading rounding off to the nearest decibel shallconstitute the final test result.
11.5 Should the result exceed the minimumpermissible sound level for the category of vehicletested by 1dB (A), two further measurements made oneach side at the corresponding microphone positionshall fall within the prescribed limits.
IS 3028:1998
ANNEX A
(Clause 3.1)
DETAILS OF VEHICLE
A-1 GENERAL
A-1.l Name andaddress of the Manufacturer
A-1.2 Vehicle Model
A-1.3 Variants
A-1.4 Category of Vehicle:[As per IS 14272 (Part 1) where applicable]
A-2.3 Overall Transmission Ratio:(Gear box ratic x Drive axle ratio x Any other ratio)1st gear:2nd gear:3rd gear:4th gear:and so on
A-3 ENGINE
A-3.1 Name and Address of Manufacturer
A-3.2 Type — Diesel/petrol, 2 stroke/4 stroke, N.WTC/DUIDI
A-3.3 Number and arrangement of cylinders
A-3.4 Cubic capacity
A-3.5 Rated maximum power (Specify relevant standard)
A-3.6 Engine speed at rated maximum power
A-3.7 Maximum governed engine speed (if applicable)
A-4 INTAKE SYSTEM
A-4.1
A-4.1.1
A-4.1.2
A-4.2
Air filter
Name of manufacturer
Type and identification
Description of complete intake system:(with a general arrangement drawing including duct length and cross section sizes)
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IS 3028:1998
A-5 EXHAUST SYSTEM
A-5.1
A-5.1.1
A-5.1.2
A-5.2
Silencer
Name of manufacturer
Identification marking
Description of exhaust system:(With a general arrangement drawing of exhaust systemindicating the lengths of exhaust pipe. tail pipe, exhaustoutlet location, and internal diameter of exhaust pipe)
A-6 COOLING SYSTEM
A-6.1 Type (Natural Air/Forced Air/Liquid)
A-6.2 Tip diameter of radiator fan
A-6.3 Maximum rpm of fan
A-6.4 Radiator core open area
A-7 FUEL SYSTEM
A-7.1 Carburetor Type: Side draughtldown draught, single “barrel/multi barrel
A-7.2 Fuel Injection Type: Inline/rotary
A-8 TYRES
A-8.1
A-8.1.1
A-8.1.2
A-8.1.3
A-8.2
A-8.3
A-8.4
Size and ply rating
Front
Rear
Others
Type (Radial/Cross Ply)
No. of tyres
Inflation pressure (Unladen)
8
IS 3028:1998
,.
ANNEX B
(Clause 3.2.2)
GUIDELINES FOR DECIDING WHETHER TESTING IS NEEDED
B-1 This Annex gives factors to be considered while performance adversely, and is still within theselecting a vehicle to represent a range or variants for stipulated limits, the type approval certificate can hetesting the vehicle for type approval as per this extended. The changes in parameters that affect thestandard and the extension of type approval certificate noise performance are listed in B-3.of one model to changes in technical specifications, orits variant(s). B-3 In the cases of following changes, with respect to
the vehicle tested, in the details submitted as perB-2 In general, when changes in technical Annex A, tests are necessary for establishingspecifications of vehicle do not affect the noise compliance:
I1 ~Engine type, capacity, number and To be tested
I arrangement of cylinders.2 ~Change in maximum power To be tested if the power is increased in excess
of 5 percent (see also B-4)
3 Approach speed for test, due to change in To be tested in case of decrease in excess of 5 percentparameters such as (see also B-4)Engine rpm at peak power, Maximumgoverned rpm, Transmission ratio, Changeof tyre size, etc.
4 Intake SystemConstruction, duct length, cross section To be tested in case of any changeAir filter type To be tested in case of any changeFuel system To be tested in case of any changeTurbocharger, supercharger To be tested in case of inclusion or deletion
5 Exhaust SystemSilencer To be tested in case of any change designExhaust front and rear pipe To be tested in case of decrease in lengthInternal diameter To be tested in case of any changeTail pipe location To be tested in case of any change
6 Type of Transmission To be tested in case of any change
71 Transmission Ratio (i) If approach speed is affected, as per S1 No. 3(ii) If the engine rpm at line Hi’ is affected such that
the gear in which testis conducted is not same
8 Unladen Weight To be tested if decrease in excess of 5 percent (see alsoB-4)
9 Body, Cab To be tested if the change caused a decrease in theengine enclosure (such as sleeper cab to normal cab)
10 Tyre
4
Size To be tested if the diameter is reducedType To be tested if change is from cross ply to radial plyNumber of tyres ~
11 Cooling SystemFan tip speed To be tested in case of increase in the fan tip speedChange in radiator core To be tested if the open area of the radiator core is
increased.
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IS 3028:1998
B-4 Inthecase ofchangesat SI No. 2,3and8 (asgiven in B-3), even if the changes are within the limitsprescribed, retest needs to be conducted to establishcompliance, it’the difference between the final results
“ as per 11 and the statutory limits is not more than1 dB(A).
B-5 On manufacturer’s request, during the typeapproval , a separate test may be conducted to decidethe engine rpm at the end of test area (line BB’), beforecarrying out the noise test, in order to decide the gear
in which the test has to be carried out. In the case ofevaluating changes in type approval test has beencarried out, except in the case of S1 No. 3 (as given inB-3). In the case of S1 No. 3 (as given in B-3) theappropriate gear in relation to engine rpm at line BB’,shall b“echosen for the test, as given in 9.
B-6 Changes other than those listed above, areconsidered to be having no adverse effect on the soundlevel.
ANNEX C
(Clause 5.1)
REQUIREMENTS OF TEST TRACK
C-O This Ann~x specifies requirements relating to thephysical characteristics of the paving and the layout ofthe test track paving.
C-1 REQUIREMENTS OF SURFACECHARACTERISTICS
A surface is considered to conform to this standardprovided that the texture and voids content or soundabsorption coefficient have been measured and foundto fu!fill all the requirements given in C-1.l to C-1.4and provided that the design requirements (see C-2.2)have been met.
C-1.l Residual Voids Content
The residual voids content (Vc) of the test track pavingmixture shall not exceed 8 percent. The measurementprocedure is outlined in C-3.1.
C-1.2 Sound Absorption Coefllcient
If the surface fails to comply with the residual voidscontent requirement, the surface shall be acceptableonly if its sound absorption coefficient (cx) is less thanor equal to O. 10. The measurement procedure isoutlined in C-3.2. The requirements specified in C-1.land C-1.2 shall only be considered as met if only soundabsorption coefficient has been measured and found tobe less than or equal to 0.10.
C-1.3 Texture Depth
The texture depth (TD) measured according to thevolumetric method (.ree C-3.3) shall be:
TD 20.4 mm.
C-1.4 Homogeneity of the Surface
Every possible effort shall be undertaken to ensure thatthe surface is made to be as homogeneous as possiblewithin the test area. This includes the texture and voidscontent, but it shall also be observed that if the rollingprocess results in more effective rolling at someplaces than at others, the texture may be different andunevenness causing bumps may also occur.
C-1.5 Period of Testing
In order to check whether the surface continues to ,.,conform to the texture and voids content or soundabsorption requirements stipulated in this standard,periodic testing of the surface shall be performed at thefollowing intervals:
a) For residual voids content or sound absorption:— when the surface is new, s— if the surface meets the requirements
when it is new, it may do so later becausesurfaces tend to become clogged andcompacted with time.
b) For texture depth (TD) :— when the surface is new,— when the noise testing starts (not before
four weeks after laying),— then every twelve months.
C-2 TEST SURFACE DESIGN
C-2.1 Area
When designing the test track layout it is important toensure that, as a minimum requirement, the areatraversed by the vehicles running through the test stripis covered with the specified test material with suitablemargins for safe and practical driving. This requires awidth of at least 3 m and length of the track extendedbeyond the lines AA’ and BB’ by at least 10 metres ateither end. Figure 3 shows the plan of a suitable testsite that indicates the minimum area which, shall belaid and compacted by a machine with the specitledtest surface material.
C-2.2 Design Requirements for the Surlace
The test surface shall comply with the following fourdesign requirements:
a) It shall be of dense asphaltic concrete;b) The maximum chipping size shall be 8 mm
(tolerance value between 6.3 and 10 mm);c) The thickness of the wearing course shall be
greater than or equal to 30 mm; and
10
d) The binder shall be a straight penetration gradebitumen without any modification.
As a guide to the test surface constructor, an aggregategrading curve which shall give desired characteristicsis shown in Fig. 4. In addition, Table 2 gives someguidelines in order to obtain the desired texture anddurability. The grading curve fits the followingformula:
P (percent passing) – lf)() (d’h/dMa.)
where
d = square mesh sieve size, in mm; and
dM,,, = 8 mm for the mean curve,10 mm for the lower tolerance curve,6.3 mm for the upper tolerance curve.
In addition to the above, the followingrecommendations shall also be considered:
.
—
——
—
—
The sand fraction (0.063 mm< square mesh sievesize < 2 mm) shall include no more than 55percent natural sand and atleast 45 percentcrushed sand;The base and sub-base shall ensure a goodstability and evenness, according to best roadconstruction practice;The chippings shall be crushed (100 percentcrushed faces) and of a material with a highresistance to crushing;The chippings used in the mix shall be washed;No extra chippings shall be added on to thesurface;The binder hardness expressed as PEN value shallbe 40 to 60,60 to 80 or even 80 to 100, dependingon the climatic conditions of that place. It isrecommended that to the extent possible a hardbinder shall be used; andThe temperature of the mix before rolling shall bechosen so as to achieve by subsequent rolling therequired voids content. In order to increase theprobability or complying with the requirements ofC-1.l to C-1.4, the compactness shall be studiednot only by an appropriate choice of mixingtemperature, but also by an appropriate number ofpassing and also by the choice of compactingvehicle.
C-3 SOUND ABSORPTION AND RESIDUALVOIDS CONTENT
C-3.1 Measurement of the Residual Voids Content
For the purpose of this measurement, cores shall betaken from the track at least at four different positionswhich are equally distributed in the test area betweenlines AA’ and BB’ (see Fig. 2). In order to avoidinhomogeneity and unevenness in the wheel tracks,cores shall not be taken in the wheel tracks themselves,but close to them. Two cores (minimum) shall be takenclose to the wheel tracks and one core (minimum) shallbe taken approximately midway between the wheeltracks and each microphone location.
1s 3U.U5 : lYY?$
Table 2 Design Guidelines(Clause C-2.2)
AggregateSize TargetValues Tolerance*/ \
ByTotal By MassMass of of theMixture,Approcase,Percent Percent
Mass of binder ( bitumen ) 5.8 N.A * 0.5Maximum clipping size ._8 mm_ 6.3-10Binder hardness 4- (.ree below)+Polished stone value (PSV) - >50-Compactness, relative to Marshall _98-
compactness
C-3.1.1 If there is a suspicion that the condition ofhomogeneity is not met (see C-1.4), cores shall betaken from more locations within the test area.
C-3.1.2 The residual voids content shall bedetermined for each core. Then the average value fromall cores is calculated and compared with therequirement of C-1.l. In addition, no single core shallhave a voids value higher than 10 percent.
C-3.1.3 The test surface constructor shall bereminded of the problem which may arise when thetest area is heated by pipes or electrical wires and coresshall be taken from this area. Such installations shallbe carefully planned with respect to future core drillinglocations. It is recommended to leave a few locationsof size approximately 200 mm x 300 mm where thereare no wires or pipes, or where the latter are locateddeep enough not to get damaged by cores taken fromthe surface layer.
C-3.2 Sound Absorption Coefficient
The sound absorption coefficient (normal incidence)shall be measured by the impedance tube method usingthe procedure specified in 1S0 10534-1 and 2:1996‘Acoustics — Determination of sound absorptioncoefficient and impedance by a tube method Part 1:Method using standing wave ratio, Part 2: Methodusing two microphones’. Regarding test specimens,the requirements outlined in C-3.1 for themeasurement of residual voids contents shall befollowed. The sound absorption shall be measured inthe range 400 to 800 Hz and in the range 80(1 to 1600Hz (at least at the centre frequencies of third octavebands) and the maximum values shall be identified forboth of these frequency ranges. Then the average ofthese values, for all test cores constitute the final result.
C-3.3 Volumetric Macro Texture Measurement
For the purpose of this standard, texture depthmeasurements shall be carried out on atleast at 10
11
IS 3028:1998
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positions evenly spaced along the wheel tracks of thetest strip and the average value obtained shall becompared with the specified minimum texture depth,The measurement procedure is outlined in Annex D.
C-4 STABILITY IN TIME ANDMAINTENANCE
C-4.1 Age Influence
It is a known fact that the tyre/road noise levelsmeasured on the test surface may increase slightlyduring the first 6 to 12 months after construction. Thesurface shall achieve its required characteristics notearlier than four weeks after construction.
The stability over time is determined mainly by thepolishing and compaction by vehicles driving on thesurface. It shall be periodically checked as statedin C-1.5.
C-4.2 Maintenance of the Surface
Loose debris or dust which could significantly reducethe effective texture depth shall be removed from thesurface.
C-4.3 Repaving the Test Area
If it is necessary to repave the test track, it is usuallyunnecessary to repave more than the test strip (of 3 mwidth as shown in Fig. 3) where vehicles are driving,provided the test area outside the strip met therequirement of residual voids content or soundabsorption when it is measured.
C-5 RECORD OF THE SURFACE AND THETESTS PERFORMED ON IT
C-5.1 Record of the Test Surface
The following shall be recorded in a format describingthe test surface:
a)b)
c)
d)
e)
f)
1S 3028:1998
Location of the test track;Type of binder, binder hardness, type of ag-gregate, maximum theoretical density of theconcrete (’DR’), thickness of the wearingcourse and grading curve determined fromcores from the test track;Method of compaction (for example, type ofroller mass, roller mass, number of passes);Temperature of the mix, temperature of theambient air and wind speed during laying ofthe surface;Date when the surface was laid and con-structed;All or atleast the latest test result, including:
i)ii)
iii)
iv)
v)
vi)
vii)
Residual voids content of each core;-Locations in the test area from where thecores for voids measurement have beentaken; .
Sound absorption coefficient of eachcore (if measured), specify the resultsboth for each core and each frequencyrange as well as the overall average;Locations in the test area from where thecores for absorption measurement havebeen taken;Texture depth, including the number oftests and standard deviation;Institution responsible for tests (i) and(iii) and the type of equipment used; andDate of the test(s) and date when thecores were taken from the test track.
C-5.2 The record of vehicle noise tests concluded onthe surface. In the format describing the vehicle noisetest(s) it shall be stated whether all the requirementshave been fulfilled or not. Reference shall be made tothe format in accordance with C-5.1.
ANNEX D
(Clause C-3.3)
MEASUREMENT OF PAVEMENT SURFACE MACROTEXTURE DEPTH USING AVOLUMETRIC PATCH TECHNIQUE
D-1 SCOPE D-1.2 This text method is suitable for field tests to
D-1.l This annex describes a procedure fordetermining the average depth of pavement surfacemacrotexture by careful application of a knownvolume of material on the surface and subsequentmeasurement of the total area covered. The techniqueis designed to provide an average depth value of onlythe pavement macrotexture and is considered in-sensitive to pavement microtexture characteristics.
determine the average macrotexture depth of apavement surface. When used in conjunction withother physical tests, the macrotexture depth valuesderived from this test method may be used todetermine the pavement skid resistance capability,noise characteristics and the suitability of pavingmaterials or finishing techniques. When used withother tests, care should be taken that all tests areapplied at the same location.
13
IS 3028:1998
D-2 SUMMARY OF TEST METHOD
The standard materials and test apparatus consist of aquantity of uniform material, a container of knownvolume, a suitable wind screen or shield, brushes forcleaning the surface, a flat disc for spreading thematerial on the surface, and a ruler or other measuringdevice for determining the area covered by thematerial. A laboratory balance is also recommendedto ensure consistent amounts for each measurementsample.
The test procedure involves spreading a knownvolume of material on a clean and dry pavementsurface, measuring the area covered and subsequentlycalculating the average depth between the bottom ofthe pavement surface voids and the tops of surfaceaggregate particles.
In spreading the material specified in this test method,the surface voids are completely filled flush to the tipsof the surrounding aggregate particles.
Pavement aggregate particle shape, size anddistribution surface texture features not addressed inthis procedure. The method is not meant to provide acomplete assessment of pavement surface texturecharacteristics. In particular, care should be exercisedin interpreting the result if the method if applied toporous surfaces and to deeply grooved surfaces.
The method can be applied to a wide range of surfaces.Nevertheless, care should be taken in interpretingresults falling outside the range of 0.25 to 5 mm intexture depth.
D-3 MATERIALS AND APPARATUS
D-3.1 Material
Solid glass spheres being essentially round shall beused. The spheres shall be graded to have a minimumof 90 percent by weight passing a 0.250 mm sieve andretained on a 0.180 m sieve complying with ISO 565.
D-3.2 Sample Container
A cylindrical metal or plastic container with apredetermined internal volume of at least 25000 mm3(25 m) shall be used to determine the volume of sandspread.
D-3.3 Spreader Tool
A flat, hard disc approximately 25 mm thick and 60 to75 mm in diameter shall be used to spread the sand.The bottom surface or face of the disc shall be coveredwith a hard rubber material and a suitable handle maybe attached to the top surface of the disc.
D-3.4 Brushes
A stiff wire brush and a soft bristle brush shall be usedto clean thoroughly the pavement surface prior toapplication of the material sample.
D-3.5 Whdshield
A suitable screen or shield may be placed on thepavement surface to protect the material sample fromthe wind and turbulence created by traffic.
D-3.6 Scale and Balance
A standard scale 300 mm or greater in length andhaving 1 mm divisions should be used.
Use of a laboratory baiance, sensitive to 0.1 g, isrecommended with this test method to provideadditional control and to ensure that the mass ofmaterial used for the surface macrotexture depthmeasurement is constant.
D-4 PROCEDURE
D-4.1 Test Surface
Inspect the pavement surface to be measured andselect a dry, homogeneous area that contains nounique, localized features such as cracks and joints.Thoroughly clean the surface using the stiff wire brushfirst and subsequently using the soft bristle brush toremove any residpe, debris or loosely bondedaggregate particles from the surface. Position theportable windshield around the surface test area.
D-4.2 Material Sample
Fill a cylinder of known volume with dry material andgently tap the base of the cylinder serveral times on arigid surface. Add more material to fill the cylinder tothe top, and level with a straightedge. If a laboratorybalance is available, determine the mass of material inthe cylinder and use this mass of material sample foreach measurement.
D-4.3 Determination
Pour the measured volume or mass of material on tothe cleaned test surface. Carefully spread the materialinto a circular patch, with the disc tool, rubber-coveredside down, filling the surface voids flush with theaggregate particle tips. Use a slight pressure on thehand, just ~nough to ensure that the disc will spreadout the material so that the disc touches the surfaceaggregate particle tips.
Measure and record the diameter of the circular areacovered by the material at a minimum of four equallyspaced locations around the sample circumference.Calculate and record the average diameter.
For very smooth pavement surfaces where the patchdiameters are greater than 300 mm, it is recommendedthat half the normal volume of material be used.
D-4.4 Number of Measurements
The same operator shall perform at least four randomlyspaced measurements on a given test pavementsurface type. The arithmetic average of the indi vidual
14
IS 3028:1998
values shall be considered to be the average surface ‘ - - ‘--- ------texture (macrotexture) depth of the tested pavementsurf ace.
~./ ‘1’BSK KJ$J’UKI
The test report for each pavement test surface shallcontain data on the following items:
D-5 CALCULATION
D-5.1 Cylinder Volume
Calculate the internal volume of the sample cylinderas follows:
V= xd2h/4
where
v = internal cylinder volume in mm3;
d = internal cylinder diameter, in mm; and
h = cylinder height, in mm.
D-5.2 Surface Mean Texture Depth
Calculate the mean texture depth (MTD) using thefollowing equation:
where
MTD =
v=
D=
MTD=4VIRDZ
mean texture depth, in mm;
sample volume (that is, internal cylindervolume) in mm3; and
average diameter of the area covered bythe material, in mm.
D-6 SAFETY CONSIDERATIONS
This test method may involve hazardous operationswhen measurements are made on traffickedpavements. This standard does not support to addressall the safety problems associated with its use. It is theresponsibility of the user of this standard to establishappropriate safety and health practices and determinethe applicability of regulatory limitations prior to use.
.
—.
.—
—
—
location and identification of test pavementsurface date;identification of the operator;volume of material used for each testmeasurement, in cubic millimetres;number of test measurements;average diameter of the area covered by thematerial, in millimetres for each test;surface texture depth, in millimetres, for each test;andaverage texture depth, in millimetres, for totalpavement text surface.
D-8 PRECISION OF THE METHOD
Controlled tests have been conducted on laboratoryspecimens having a range of macrotexture depth 0.5to 1.2 mm.
The standard deviation of the repeated measurementsby the same operator on the same surface can be as lowas 1 percent of the average texture depth.
The standard deviation of the repeated measurementby different operators on the surface can be as low as2 percent of the average texture depth.
The standard deviation of the site-to-site variation maybe as large as 27 percent of the average texture depth.Here, site defines a randomly selected location withina nominally homogeneous pavement section. Thismeans that a large number of measurementobservations would be necessary to estimate theaverage texture depth reliably for given pavementtypes with large variations in texture, despite the factthat the method is highly repeatable and not subject tolarge operational influences.
15
IS 3028:1998
ANNEX E
(Foreword)
COMMITTEE COMPOSITION
Automotive Testing and Performance Evaluation Sectional Committee, TED 8
ChairmanSIiRI R. RAMAKRISHNAN
28, ICross Road, Kasturi Bai Nagw, Adyar, Chennai 600020Memfrer.s
St!w R R. G. MENONStmi R. C. BALAKRISHANAN (Alternate)
SHRI RAJAT NANDISHRIS. G. SHAH (A/fernafe)
SHRI V. K. BHA’t’IASIIRI HIRA LAL (A/temafe)
SHRI K, E. TAKAVALESIIRI AKBAR BADUSH(A[rer-rrate)
SHRI T. M. BALARAMANSHRI V. M. MANEL (Alternate)
SHRI V. M, MLINDADASHRI R, M. KANITKAR (Alfernafe)
SIIRI S. R. TAPADESHRI P, C. BARJATIA (Ahernafe)
SHRI R. S. DASSSIIRI M. L. MEHTA (Akrnafe)
Sfnu P. K. SAHA
MAJORBALWINDERSINGH(Ahernate)SHRI DINJNI TYAGI
SHRISURYA PATNAIK (Alferrrate)SHRI N. K. KAUSHAL
Stw S. K. GAUTAM (Alternate)SHRI S. K. BHARIJ
SFiRIR. K. TRIPATI (Alfernafe)SHRI VEENLIMA’rHuRSHRI K. C. JAIN
SHRTR. K. GuM’A (Alfernafe)SHRI S. B. GLTPTA
SHRI HARJIT SINGH (Alternate)SHRI U K. KINI
SHW M. G. JHINGRAN (Alternate)DR K. K. GANDf+I
SHRI MUKESHSAXENA (Alfernafe)SHRI P. V. BHANDARESIIRI S. K. MUKHERJEE
SHRIZ. A. MUJAWAR (AUerrrafe)SHRI 1.V. RACJ
SHRI P. PANDA (Alternate)SHRI S. N. SRINIVASAN
SHRI K. D. DIGHE (Alternate)DR Y, SATYANARAYANA
SHRI M. L. GORE (Akernate)SHRI LAKHINDERSINGH
SHRIS. R. AGRAHARI (Altewrate)SHRI A. T. PHATAK
Stwa A. V. KULKARNI (Alternate)SHRI R. C. SETHI
SHiU R. RAJARAMAN(Alternate)SHRI M. K. MISHRA
SHRI R. G. KAREMORE(Alfernute)SHRI P, N. RANGANSIIRI A. R. GULAn,
Director (Transport Engg)
Representing
Ashok Leyland Ltd, Chenncri
Association of Indian Automobile Manufactures, New Delhi
Association of State Road Transport Undertakings, New Delhi
Automotive Research Association of Indirr Ltd, Pune
Bajaj Auto Ltd, Pune
Bajaj Tempo Ltd, Pune
Central Institute of Road Transport, Pune
Central Farm Machine Training and Testing Institute, Budni
Controllerate of Quality Assurance (Vehicles) [DGAQ(V)],Ministry of Defence Ahmednagar
Daewoo Motors India Ltd, New Delhi
Directorate General of Supplies and Disposrds. New Delhi
Department of Industrial Development, New Delhi
Royal Enfield Motors Ltd, ChennaiEscorts Ltd, Faridabad
Hero Honda Motors Ltd, New Delhi
Hindustan Motors Ltd, Hooghly
Indian Institute of Petroleum Dehradun
Kinetic Engg Ltd, PuneMahindra and Mahindra Ltd, Mumbai
Vehicle Research and Develpoment Establishment, Ahmednagar
Vehicle Factory, Jabalpur, Ministry of Defence, OFB
Volvo India Pvt Ltd, BangaloreDirector Geneml, BIS (Ex-oficio member)
Member- Secretary
SHRIA.K,NAGPAL
Additional Director (Transport Engg), BIS
16
Bureau of Indian Standards
BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promoteharmonious development of the activities of standardization, marking and quality certification of goodsand attending to connected matters in the country.
Copyright
BIS has the copyright of all its publications. No part of these publications may be reproduced in any formwithout the prior permission in writing of BIS. This does not preclude the free use, in the course ofimplementing the standard, of necessary details, such as symbols and sizes, type or grade designations.Enquiries relating to copyright be addressed to the Director (Publications), BIS.
Review of Indian Standards
Amendments are issued to standards as the need arises on the basis of comments. Standards are alsoreviewed periodically; a standard along with amendments is reaffirmed when such review indicates thatno changes are needed; if the review indicates that changes are needed, it is taken up for revision. Usersof Indian Standards should ascertain that they are in possession of the latest amendments or edition byreferring to the latest issue of ‘BIS Handbook’ and ‘Standards: Monthly Additions’.
This Indian Standard has been developed from Doc : No. TED 8 ( 4754 ).
Amendments Issued Since Publication
Amend No. Date of Issue Text Affected
BUREAU OF INDIAN STANDARDS
Headquarters:
Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002Telephones :3230131, 3233375, 3239402
Regional Offices’ :
Central : Manak Bhavan, 9 Bahadur Shah Zafar MargNEW DELHI 1.10002
Eastern : 1/14 C. LT. Scheme VII M, V. I. P. Road, KankurgachiCALCUTTA 700054
IS 3028:1998 AUTOMOTIVE VEHICLES — NOISE /!EMITTED BY MOVING VEIIICL,ES — METI1OD
OF MEASUREMENT
( .!kwtd Revision )
[Paxe 3, .’iaz[.$e6.11(.we a/so Atnendment No I)] — Insert the following atthe end:
‘Actual weight during testing shall not vary from the specified unladen weight bymore than 15 percent of described weight.’
(’rED 4)
Reprography Unit, BIS, New Delhi, India
w,‘, -...,—. :
.
.,. -.— ‘-” . . ----- -:
...
AMENDMENT NO. 4 NOVEMBER 2012TO
IS 3028 : 1998 AUTOMOTIVE VEHICLES – NOISEEMITTED BY MOVING VEHICLES – METHOD OF
MEASUREMENT
( Second Revision )
[Page 5, clause 9.4.1.1(b)] ― Insert the following at the end:
‘In the case of vehicles having different overall gear ratios the representative ofthe type by the test vehicle is determined as follows:
a) If the highest sound level is obtained between the ratio x/n and ratio Xthe vehicle shall be deemed representative of its type;
b) If the highest sound level is obtained at ratio x/n the vehicle selectedshall be deemed representative of its type only for those vehicles whichhave a lower overall gear ratio at x/n;
c) If the highest sound level is obtained at ratio X the vehicle selected shallbe deemed representative of its type only for those vehicles which havea higher overall gear ratio than the gear ratio X.
d) However the vehicle is deemed representative of its type also, if at theapplicant's request the tests are extended over more ratios and thehighest sound level is obtained between the extreme ratios tested.’
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