Signature analysis of acceleration and torque signals of compressor pump assemblies for quality control

A description is given of an evaluation of signature analysis techniques for online inspection of every compressor pump assembly from an automatic manufacturing and assembly line. Time-domain and frequency-domain diagnostic methods are tested for the ability to amplify the signal from a flaw in the presence of background signals. A signature analysis method is then developed for which the signals are only evaluated in the time domain. The torque signal must stay within a maximum and minimum pass band to be acceptable. The accelerometer signal is averaged to reduce random-noise signals, then squared and integrated. This is shown to provide a superior method for the detection of transient defects and the angular location of flaws.<>