Analytical tachometers

摘要

Method and apparatus for engine and rotary machine analysis provides a vibration sensor adapted to produce a plurality of superimposed waveforms corresponding to engine or machine operating parameters including rotational speed. Alternatively, exhaust gas pressure sensing may be used to obtain a corresponding waveform pattern. The pattern of waveforms is analysed, for example using a fast fourier transform technique whereby the characteristic pattern of waveforms can be identified and recognised. Changes in pattern can be used to assess the state of wear of a machine. <IMAGE>