7. RotorDynamics and Active Detection of Faults in Rotating Bodies

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Standard fault diagnosticsFaults can cause high harmonics and modulation in thenormal vibrationsspeed responseConventional fault diagnosticsUse measurements during operationSignal processing, neural networks and statisticsIn practice,Small defects produce small changes in the signalsUnbalance dominant responselow SNR for detection of faultsConsequently: Faults are only detected when theyexceed dangerous levelsI. Bucher
Whirl in presence of a crack0 O0 Oforward 50.4 [Hz]Stress - constant180 O180 O 0 O360 OStatic StressbackwardsStress-50.1 [Hz]1x0 OStress 2x90 O0 O180 O180 O0 O 360 ODynamic Stress
Page 1 and 2: Rotor Dynamics andActive Detection
Page 9 and 10: Disk dynamicsDifferences & similari
Page 11 and 12: RotationStationary excitation & res
Page 14 and 15: Transient signal&signal processingI
Page 16 and 17: Forward & backward whirlseparationI
Page 18 and 19: Time-frequency• SpectrogramI. Buc
Page 20 and 21: Campbell diagram - measuredfrequenc
Page 22: Complete test-rigI. Bucher
Page 29 and 30: Test Rig - OverviewLaserMeasurement
Page 31 and 32: Using laserDisksMeasurement systemI
Page 33: 21Actuator &sensorActuator &sensorI
Page 37 and 38: First forward critical speed :62.9
Page 39 and 40: Kirson Y. Problems relating to bala
Page 41 and 42: Shaft anisotropyDeviatory stiffness
Page 43 and 44: sensorHarmonic balance & Taylor exp
Page 45 and 46: 53I. Bucher
Page 47 and 48: asymmetric rotor with and without a
Page 49 and 50: frequencyspeed59I. Bucher
Page 51 and 52: I. Bucher
Page 53 and 54: Thank youI. Bucher
Page 55 and 56: Angular unbalanceAsymmetric discDoF
Page 57 and 58: Perfectly balancedSymmetric disce3A
Page 59 and 60: Classical Rotor Dynamics Modelling3
Page 61 and 62: SDT Rotor1 D beam/mass (critical sp
Page 63 and 64: Inertial C.S.General formSeries Sol
Page 65 and 66: Engine order domain+forwardtime (sp
Page 67 and 68: 26I. Bucher
Page 69 and 70: I. Bucher

7. RotorDynamics and Active Detection of Faults in Rotating Bodies

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