Analysis of electric noise at vibration based diagnostics of motor-coach stock assemblies

Abstract

Wide dynamic and frequency ranges, low level of noise allow using piezoelectric accelerometers as general purpose sensors for monitoring and diagnostics of vibration condition of assemblies of prospective motivecoach stock. Electric noise of a vibration parameters measuring channel depends not only on noise from the detecting element, but also on the further processing of a signal, first of all on the operation of an analog-todigital converter (ADC). The paper considers a comparative analysis of electric noise level of the vibration parameters measuring channel for piezoelectric and MEMS-accelerometers with the consideration for the influence of the ADC. As a result, the best ADCs for measuring vibration parameters are 12-digit and 16-digit ones.