Fig. 1: In-situ balancing with open shaft: Balancing computer with key-phasor laser
resonance problems
•Onsitetroubleshootingforunresolved
vibrationproblems
•Acceptancetestsandconditionmoni-
toringofshaftswithbushbearings
•Ballbearingdiagnosis:Usingacoustic
emissiontechniquesfaultsinballbea-
ringscanbedetectedinanearlystate
Balancing of machines without disassembling
Fig. 3: In-situ balancing of a ventilator with the “VibXpert” analysis device
Benefits
Focusofallourservicesistheimmediate
benefitforthepersoninchargeofthe
machines:
•Promptandclearreportsand
presentations
•Reliablestatementstosupportdecisi-
onmakingonfurthermainte-
nancestrategy
•Rapidresponsetoordersand
flexibleworkplanning
Success stories
Wehavebalancedseveralfans
inpowerplants,allofwhich
haveimprovedvibrationlevels
greatly.
How is in-situ balancing done?
In-situbalancingisasimpleandproven
method.Alotofmachinescanbeba-
lancedbycausingonlylittledowntimes.
Whencarryingoutbalancingin-situ,all
actionisdonewiththemachineassem-
bled.Forasuccessfulbalancing,onlyfive
stepsanecessary:
1.Determinationofvibrationstate”as-is“
2.Mountingofalittlemassontothe
rotorintendingtoperturbthesystem
3.Determinationofthevibrationstate
ofthemanipulatedsystem
4.Knowingthevibrationoftheoriginal
andmanipulatedsystemabalancing
softwarecalculatesthemassandang-
leneededtobalancethesystem
5.Applicationofthefinalbalancing
massandvibrationmeasure-
menttocheckthesuccessof
thebalancingprocess
Toconducttwo-planebalancing
onlyoneadditionalbalancing
cycleisneeded.
Further services
In-situbalancingispartofour
comprehensiveservicesinthe
fieldofvibrationassessmentand
conditionmonitoring:
•In-situbalancingaccordingto
ISO14694
•Experimentalmodalanalysisforsolving
In-situ balancing of rotors
In-situ balancing: Benefits
Withoutdisassemblingtherotor(“in-
situ”)manymachinescanbebalanced
whichsignificantlyimprovedvibration
levels.Poorbalancingisoneofthemain
causesforprematuremachinefailure.
Withonlyaminorbreakinoperation
in-situbalancingyieldsawellbalanced,
smooth-runningmachinewiththefollo-
wingadvantagesforyou:
•Lowvibrationensureslittleloadonbea-
ringsandsupportingstructure
•Wearundfatiguepossiblyleadingto
unpredictedfailurecanbeprevented-
longeroperatingtime
•Vibrationlimitsofacceptancetests,stan-
dards,andperiodicaltestscanberea-
chedmoreeasily
Applications
Fans / ventilators
Duetoadhesionofdustthebalanceof
manyfansdeterioratesovertime;even
cleaningoffanscannotalwaysreesta-
blishgoodbalance.Moreover,vibration
levelsoffansareoftensensitivetopoor
balancingduetothelowstiffnessoftheir
supportingstructures.Here,in-situbalan-
cingcanimprovebalanceandvibration
immediately.
Mills, gas turbines and jet engines
Anymachinecanbebalancedin-situ,if:
•Vibrationmeasurementsarepossible
•abalancingmasscanbemounted
Fig. 5: Balancing as maintenance: the success of balancing is visible in the decline of vibration
Fig. 2: Balanced fan with mounted balancing mass (red circle)
Fig. 4: The success of balancing as seen in a polar diagram: the closer to the origin the lower the vibration level
MONITORINGSYSTEMS CONDITIONMONITORING ROTORDYNAMICSSOUNDANDVIBRATIONANALYSIS
CONTACT
How to find us...
www.kerntech.de
Leave the A2 at the AS Bad Nenndorf exit (38) towards Barsin-
ghausen and follow the B65. Leave the B65 and drive straight
ahead following the L391. Turn to your right on Nienstedter Straße
(L401) after about 3-4 kilometres. Follow this road for approxima-
tely 70 meters before turning left in the street Neue Rehre. Leave
the Neue Rehre and turn to your left in the Steinradweg. You find
your destination on the right side at the Forsthaus.
Layo
ut: B
ernd
.Sch
uste
r@xx
sdes
ign.
deIn-situ balancing of rotorsIn-situ balancing of rotors
Kerntech GmbHAm Forsthaus 8D-30890 BarsinghausenTel.+49.511.67668873Fax+49.511.67668888Vanity:0700-KERNTECH
E-mail: [email protected]@[email protected]@kerntech.de
Executive director: Dr. Jürgen FiedlerHRB Hannover 59019
References: Inparticularwehavemanyyearsofworkexperiencewith:
E.ON-KernkraftE.ONKraftwerkeVattenfallMTUVWSincorRichterChemietechnik
Certified according to DIN EN ISO 9001:2008
CONDITIONMONITORINGSYSTEMS ROTORDYNAMICS SOUNDANDVIBRATIONANALYSIS
