Torsional vibration signal detection method and device for engine crankshaft

Abstract

The invention discloses a torsional vibration signal detection method and device for an engine crankshaft. The torsional vibration signal detection method includes that gathering rotation pulse signals of the front end of the engine crankshaft, converting the rotation pulse signals into rotating speed signals and angular speed signals, extracting the high-frequency component from the angular speed signals, performing point-by-point integration, converting a high-frequency time domain signal obtained through integration into a frequency domain signal through fast Fourier point-by-point transformation, and inputting the rotating speed signal nk of each equalization signal Qk and angular displacement frequency domain signals Yk into a three-dimensional coordinate system in sequence through a three-dimensional torsional vibration data generating module of the engine so as to obtain three-dimensional torsional vibration data of the engine, wherein the horizontal coordinate is related to the torsional vibration frequency of the engine, the left vertical coordinate is related to the amplitude, and the right vertical coordinate is related to the rotating speed. The torsional vibration signal detection device uses the combined design, the mounting is facilitated, and the detection is not influenced by the engine and outside vibration; the torsional vibration signal detection device is good in reliability, high in measuring precision, convenient to analyze and calculate, strong in adaptability, light in weight and strong in portability.

Description

technical field [0001] The invention belongs to the field of engine testing, and in particular relates to a detection method and device for an engine crankshaft torsional vibration signal. Background technique [0002] At present, laser Doppler torsional vibration instruments and magnetoelectric sensors are mostly used for engine torsional vibration measurement. Laser Doppler torsional vibration instruments are sensitive to the vibration of the engine bench, and the equipment is huge, so it can only be used on the engine bench. It is suitable for portable work, and the cost is relatively high. If the table vibrates heavily, it will not be possible to obtain a stable signal. Magnetoelectric sensor testing needs to process signal acquisition disks for different models, which has poor adaptability, and has high requirements for testing distance and installation location. The testing distance is too large or too small, and there is vibration in the installation location, so it i...

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Problems solved by technology

[0002] At present, the laser Doppler torsional vibration meter and magnetoelectric sensor are mostly used in engine torsional vibration measurement. The laser Doppler torsional vibration meter is sensitive to the vibration of the engine bench, and the equipment is huge, so it can only be used on the engine bench. It is suitable for portable work, and the cost is high. If the table vibrates greatly, it will not be possible to obtain a stable signal

Magnetoelectric sensor testing needs to process signal acquisition disks for different models, which has poor adaptability, and has high requirements for testing distance and installation location. If the testing distance is too large or too small, and there is vibration in the installation location, it is impossible to obtain stable and effective results. torsional vibration signal

[0003] The above test method is not suitable for the collection of engine crankshaft torsional vibration signals due to the above defects

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