HOW SENSOR MOUNTING AFFECTS MEASUREMENTS

摘要

Sensor mounting can significantly affect both overall vibration and FFT (Fast Fourier Transform) data. This paper describes the differences and confusion in overall measurement techniques and shows how frequency response can affect these measurements. The frequency response of some common mounting methods, such as stud, 2-rail magnet, and flat magnet are measured under controlled laboratory conditions and the results presented. The laboratory data is then correlated with actual machinery data. The paper also shows the dramatic effect that mounting has on commonly used high frequency overall measurements such as Spike Energy and PeakVue that are used for early warning of bearing and gear faults.