Dynamic Characterization of Noise and Vibration Transmission Paths in Linear Cyclic Systems: Part II - Experimental Validation

摘要

Linear cyclic systems (LCS) are a class of systems whose dynamic behaviors change periodically. The first part of this two-part paper derives a generic expression that describes how the noise and/or vibration are transmitted between two (or multiple) points in LCS. In Part II, some experimental results validate the theoretical development in Part I. Noise and vibration transmission paths of scroll and rotary compressors (two typical LCS) are examined to show that LCS indeed generate a series of amplitude modulated input signals at the output, where the carrier frequencies are harmonic multiples of LCS' fundamental frequency. The criterion proposed in Part I to determine how well LCS can be approximated as linear time-invariant systems (LTIS) is applied to the noise and vibration transmission paths of the two compressors.