Calculation and verification for crankshaft torsional vibration of hypercompressor in LDPE unit
Multi-body dynamics and lumped parameter methods were adopted respectively to do modal and response computation for an in-service secondary compressor shafting in low density polyethylene unit.Its torsional vibration was tested and evaluated by the wireless strain testing system to obtain the dynamic torque and first-order natural frequency of the shafting.The comparison results between the calculation and the test show that the computation errors in time domain for both the multi-body dynamics method and the lumped parameter method to test results are less than 17%,and that for the first-order natural frequency is less than 3%.Both methods are suitable for analyzing the torsional vibration of the shafting with similar structure without obvious dynamic characteristics,and the computation accuracy of both methods can meet engineering requirements.
low density polyethylenetorsional vibrationmultibody dynamics methodlumped parameter methodcompressor
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