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AMRL-TR.75-50 Volume 4 j 00 USAF BIOENVIRONMENTAL NOISE DATA HANDBOOK C Volume 4 MA-1A Power Unit, Gas Turbine Engine (AiIkesearch) JUNE 1975 DDC Approved for public release; ditribution unlimited fPcc = SEP 14 19T6 D AEROSPACE MEDICAL RESEARCH LABORATORY AEROSPACE MEDICAL DIVISION Air Force Systems Command Wrlght-Patlerson Air Force Base, Ohio 45433
Transcript

AMRL-TR.75-50

Volume 4

j00

USAF BIOENVIRONMENTAL NOISE DATAHANDBOOK

C Volume 4MA-1A Power Unit, Gas Turbine Engine(AiIkesearch)

JUNE 1975

DDCApproved for public release; ditribution unlimited fPcc =

SEP 14 19T6

D

AEROSPACE MEDICAL RESEARCH LABORATORYAEROSPACE MEDICAL DIVISIONAir Force Systems CommandWrlght-Patlerson Air Force Base, Ohio 45433

IT

NOTICES

WhenUS Government drawings, specifications, or other data are used for any parpose other than a dvtfinitelyrelated Government procurement operation, the Government thereby irn.urs no responsibility nor anyobligation whatsoever, and the fact that the Government may have formulated, furnished, or in any waysupplied the said drawings, -spe0cications, or other data, is not to be regarded by implication or otherwise, asin any manner licensing the holder or any other person or corporation, or conve3 ing an rights or pe.missionto manufacture, use, or sell-any patented invention that may in any way be related thereto.

Do not return this, copy. Retain or destroy.

Please do not request copies of this report from Aerospace Medical Rtsearch Laborator). Additional copiesmay be purchased from:

National Technical Information Service5285 Port Royal RoadSpringfield, Virginia 22161

Federal Government agencies and their contradors regi:tered with Defense Documentation Center (DDC)should direct requests for copies of this report to:

DDCCameron StationAlexandria, Virginia 22314

This report has been reviewed by the Infometion Office (01) and is ruleasable to the National Techni,'alIntormation Service (NTIS). At NTIS, it will be available to the gunw-0l piblic, including foreign nations.

This technical report has been reviewed and is approved for publication.

FOR THE COMMANDER

If .' NNIN<J. VON Ull-ItKil-l)arcciorlbiodynamics and Bionics )ivisiunAerospace Mcdical Rcscarch Laboratory

-1Ai - A.. ir P

SECURITY CLASSIFICATION OF THIS PAGE (When Data Entered) ___

REPORT DOCUMENTATION PAGE REAL INSTRUCTIONSBEFORE LOMPLETING FORM/1. REPORT NUMBER 2. GOVT ACCESSION No. 3. RECIPIENT'S CATALOG NUMBER

MRL-TR-75-50....Vok-4 __________

~ TiLE (and Sub~t~e S. TYPE OF REPORT & PERIOD COVEREDSAIOENVIRONMENTAL NOISE DATAHAND---- K- \fo ~ e '/ '-- " olume 4 of a series

MA-lA Power Unit, Gas Turbine Engine 6. PERFORMING ORG. REPORT NUMBER

7. R( ~ i.CNRCOUMBER(s)

'ick A. Farinacci,.. 9PE F RMING ORGAN IZ TION NAME AND A DDR SOT PROG A E EME T

ARE AORK UT NUMBERSAerospace Medical Research LaboratoryAerospace Medical Division, Air Force Systems 62202AC. 7 23 1

70 4 -6o0 F,7231)0418

Command, Wright-Patterson AER1 OR 45433 /~II. CONTROLLING OFFICE NAME AND ADDRESS 12. REPON'ATE

Same as above 0 I UMBER OF PXGES,-• , 64

14. MONITORING AGENCY NAME & ADORES ontrotitng Office) 15. SECURITY CLASS. (of this report)

ISa. DECLASSIFICATION/DOWNGRADING

jY-II /ISCHEDULE

16, DISTRIBUTION STATEMENT (of this Report)

Approved for public release; distribution unlimited

17. DISTRIBUTION STA'EMENT (of the abstract entered In Btock 20. If different trom Report)

IS. SUPPLEMENTARY NOTES

19. KEY WORDS (Continle o.i tevetla aide if neceeaary and Identify by block number)

NoiseNoise EnvironmentsBioenvironmental NoiseAerospace Ground EquipmentMA-1A Power Unit, _Gas Turbine Engine (AiResearh)

Z0. ABSTRACT (Continue on ,evetoe aide It neceaseay and identify by block number)

"'AThe MA-lA Power Unit is a turbine engine driven source of pneumaticpower for starting aircraft jet engines and furnishing heated pneumatic powerto other types of pneumatically operated equipment. This report providesmeasured and extrapolated data defining the bioacoustic environments producedby this unit operating outdoors on a concrete apron at normal rated/loaded con-ditions. Near-field data. are reported for 37 locations in a wide variety c fDDFORM

DD JAN 73 1473 EDITION OF I NOV 65 IS OBSOLETE

SECURITY CLASSIFICbTION OF Thl, . AGE (1'7'.on Dta Vr.t -d)

_ _- . _ _

SECURITY CLASSIFICATION' OF THIS PAGE(Whon Data Entated)

physical and psychoacoustic measures: overall and band sound pressure levels,

C-weighted and A-weighted sound levels, preferred speech interference level,perceived noise level, and limiting times for total daily exposure of personnelwith and without standard Air Force ear protectors. Far-field data measuredat 36 locations are normalized to standard meteorological conditions and extrapolated from 5-800 meters to derive sets of equal-value contours for thesesame seven acoustic measures as functions of ngle and distance from thesource. Refer to Volume 1 of this handbook, TUSAF Bioenvironmental NoiseData Handbook, Vol 1: Organization, Content and Application, '-"AMRL-TR-75-50(1) 1975, for discussion of the objective and- design of the handbook, thetypes-of data presented, measurement procedures, instrumentation, data pro-

cessing, definitions of quantities, symbols, equations, applications, limitationetc.

.1

Ois It SctIl

ON gulf Seties 0

UKANIIDJ ctl 0

OISTRIBUTION/AYAILAnIIITY CrDES

Slit. AVAL aINsi ECi A

1 -SECURITY CLASSIFICATION OF THIS PAGE(147sn Data Fnteed)

PREFACE

This report was prepared by the Biodynamic Environment Branch Aerospace Medical- ResearchSLaboratory, under Projectnsask 723104, Measurement of Noise and Vibration Environments of Air

Force Operations.

The author acknowledges the efforts of Mr. Robert T. England and Mr. Robert G. Powell who conductedthe field measurements, and Mr. John N. Cole who -established the data analysis requirements andassisted in the preparation of this report. Mr. Henry Mohlman and Mr. David Eilerman of the Univer-sity of Dayton assisted in the mechanics of data processing; and Mrs. Norma Peachy and Mr. MikePatterson prepared the graphics.

t

(\

It

Table of Contents

Page

INTRODUCTION ........................................................................ 3

NEAR-FIELD NOISE ................................................................... 4

FAR-FIELD N OISE ..................................................................... 5

REFEREN CES .......................................................................... 62

List of Tables

NEAR-FIELD NOISE1. Measurement Location and Test Condition for

Operator Noise Measurements ....................................................... 42. Measured Sound Pressure Level

113 Octave Band ................................................................... 7-0Octave Band ....................................................................... 10- 12

3. Measures of Human Noise Exposure .................................................. 13-15

FAR-FIELD NOISE4. Measured Sound Pressure Level

113 Octave Band ................................................................... 16--17

List of Figures

NEAR-FIELD NOISE1. M easurement Locations ............................................................... 19

FAR-FIELD NOISE

1. Measurement Locations ............................................................... 192. Normalized Noise Levels .............................................................. 20- 213. Overall Sound Pressure Level - Contours ............................................ 22-234. C-Weighted Sound Level - Contours .................................................. 2.1-255. A-Weighted Sound Level - Contours ................................................. 26-276. Perceived Noise Level - Cont, urs .................................................... 28-297. Speech Interference Level - Contours ................................................ 30-318. Permissible Exposure Time - Contours ............................................... 32-439. Octave Band Sound Pressure Level - Contours ............................. 44-61

2

~INTRODUCTION

The MA-1A Power Unit is a turbine engine-driven source of pneumatic power for starting aircraft jet

engines and furnishing heated pneumatic power to other types of pneumatically-operated equipment.This unit is manufactured by the AiResearch Manufacturing Company.

This volume provides measured and extrapolated da-La defining the bioacoustic environments pro-duced by this unit. Such data are essential to evaluate ear protection requirements, limiting personnelexposure times, voice communication capabilities, and annoyance problems associated with operationof the MA-1A power unit.

This volume is one of a series published by the Aerospace Medical Research Laboratory (AMRL) undertWe same report number (AMRL-TR-75.50) as a multi-volume handbook that quantifies the noise

i , environments produced at flight/ground crew locations and in surrounding communities by operations2of Air Force aircraft and aerospace ground equipment. The far-field, coimmunity-type, noise data in thehandbook describe the noise produced duringground opoaraions of aircraft, aerospace ground equip-ment, and other ground-based equipment or facilities.

Volume 1 of this handbook discusses the objectives and design of the handbook, the types of datapresented, measuremaent procedures, instrumentation, data processing, definitions of quantities,symbols, equations, applications, limitations, etc. Volume 2 provides a method and data for adjustingthe handbook's far-field noise (Ito, which are for standard meteorological conditions (15C tempera-ture, 70% rel humidity, 0.760 meters Hig barometric pressure) to derive comparable data for othermeteorological conditions. Refer to Volumes I nd 2 (references 1 and 2) for such information because itis not repeated in other handbook volumes.

A cumulative index lists those aerospace systems contained In the handbook, and identifies the specificvolumes containing each type of environmental noise data available (i.e., inflight/flight crew andpassenger noise, near-field/ground crew noise, far-field/community noise). Volume numbers ore as-signed sequentially as individual volumes are published. T is index is periodically updated as indi-vidual volumes are published, and is available upon request from AMRIJBB E, Wright-Patterson AFB,O 145433. Organizations on the distribution list for the handbook will automatically receive a copy ofthe updated index as it is generated.

Direct any questions concerning the techlmical data in this report and other handbook volumes to:AMRL/BBE, Wright-Patterson AFB, OH ,15433; Autovon 78.53675 or 78.53604; Commercial (513) 255-3675 or (513) 255-3664.

_ _ _ _ _ _ _ _ _3

',I

NEAR-FIELD NOISE

MEASUREMENTSA standard MA-1A power unit was operated outdoors on a concrete apt on at normal rated conditions of42,500 RPM with no significant sound-reflective surfaces prescnt except the ground plane. Table 1notes the surface meteorological conditions at the time of measurement.

Figure 1 identifies 72 noise measurement locations at a height of 1.5 meters above the concrete apron(nominal ear level of ground crew). The 0 degree reference direction passes through tht tow bar. The 36locations on the two inner circles are in the acoustic near-field of the source where the sound wave -

fronts generally do not spherically diverge and the source appears to be spatially distributed (i.e., not apoint source). Consequently, these near-field data cannot be extrapolated to longer distances but doproperly define the levels at locations close to the unit.

Near-field measurements were also made at ear level at the operator control panel. Table 1 lists thenumericialphabetic designator used on the data pages in this report to identify the operator measure-ment location and test condition. The designator 1/A means operator location 1 and tept condition A.Such a descriptor is essential in many handbook volumes t*.at involve multiple combinations oflocations/conditio.is. It is used in this report to maintain format consistency.

RESULTSThe measured data presented in Table 2 define the sound pressure levels (SPL) produced by the MA.1Aumt at the 37 specified, near-field locations. This table includes the overall, 113 octave band, and octaveband levels. From these data one can calculate the variety of measures in Table 3 which are widely usedto assess the effects of noise on personnel and their performance.

For (ata at other intermediate near-field locations (i.e., for radial distances less than 5 meters) you caninterpolate between the 72 measured data points. All near-field data are for the meteorologicalconditions tt the time of test but are valid for till typical airbase meteorology because of the short

distances over which the sound is propagated.

TABLE I

M!EASURIEMENT LOCATION AND TEST CONDITIONFOR OPERATOR NOISE MEASURE.MENTS

MA-1A Power Unit. Gas Turbine Engine (AiRlosearch)Eglin AFB, 26 Jul 1971

Serial 0 2835SODEF0SD

Nea*IufrefoeIt 1.0ratioat

1 Operator Control Panel

AGE Operation

A 42,500 RPM

Meteorology

Teniperature 29 CBar Pressure .70 M ligRel lunidity 80%

.1.

FA-IL OSMESREETNus esrmnseeas aeo h aeMA1 ntudrtesm etcniin i h

~~-* MESURETS

Table -1 hist the overall and 132 octa~e band SPL measured at the 36 far-field locations unvder theAIi I mneteozological conditions at the time of test. These data were normalized to 10 meters distance and -

standard meteorolugical conditions (15C temperature, 70% rel humidity, 0.760 meter Hg barometricpruwsurej and used tu deri% t the gi aphic, data in Figure 2 which providles a comp~act summary of thefar-field noise characteristics of the MIA-lA power unit in a standard format.

Theseu measuied data wvere also used to derive sets of equal noise contours (Figures 3 through 9)describing seven different iseasures of noise as functionsh of angle and distance froml the source forandalili dayi mleteuroulugy. Note that Figure 8 contursiduntify limiting expoeure times fur personnel.MAlsaing datta poito onl an) Jfthe '.untours aret hL res:ult of eliminating measured data MIch containedexcessive influence of spurius bcckgrund novise present at the time uf measurement. In some cases,-Luntur Ic'. els it, these missing dtta points were estimated and Indicated with dashed lines.

VltmeiL 2 uf tile handbook defines tile influence of meteorology on far field noise environments andpros leN ift euatlled, thet factors nczessary to adjusbt thle handbook standard meteorological (lay data.

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REFERENCES

1. Cole, John N., USAF Bioenvironmental Noise Data Handbook, Volume 1: Organization, Content andApplication, AMRL-TR-75-50 (1), Aerospace Medical Research Laboratory, Wright-Patterson AirForce Base, Ohio, 1975.

2. Cole, John N., USAF Bioenvironmental Noise Data Handbook, Volume 2: Procedure to EvaluateEffects of Non-standard Meteorological Conditions on Far-Field Noise, AMRL-TR-75-50 (2), AMRL,WPAFB, OH, 1975.

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