Speed measurement of diesel engine based on vibration signal

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (22) : 252-256.

ZHANG Shuai 1 ZENG Rui-li 2

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Abstract

It is an important method to measure the engine speed by using vibration signal, but it has a high demand on the engine vibration frequency, so it has a great influence on the measurement accuracy when the speed changes dramatically. A new method based on Hilbert envelope and autocorrelation was proposed. Using wavelet transform to eliminate the baseline drift firstly. Then the quasi-steady-state analysis is carried out by means of a short-time window, and the Hilbert envelope and three autocorrelation are used in time domain analysis to calculate the rotational speed of the engine in a short-time window. Finally, the continuous engine speed is obtained by moving the window method. Through the variable working condition experiment on the engine bench, the synchronous acquisition vibration signal and the rotating speed sensor signal are compared and analyzed, and the maximum error of speed measurement under the condition of rapid acceleration is less than 1.4%. It can effectively meet the requirements of real-time and accuracy of diesel engine’s speed, and has a great application prospect in the field of non-disassembly test and unloaded power detection.

Key words

Diesel engine speed / Vibration signal / Baseline drift / Short-time window / Hilbert transform / Autocorrelation

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ZHANG Shuai 1 ZENG Rui-li 2. Speed measurement of diesel engine based on vibration signal[J]. Journal of Vibration and Shock, 2017, 36(22): 252-256

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