Misfiring Method for Identifying Angular Vibration Mode of ICE Crankshaft
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摘要: 根据内燃机动力学和曲轴的简谐角位移基本关系式,提出了内燃机曲轴角振动振型的停缸识别法.某缸质量某谐次角振动相对振幅正比于各缸正常工作和该缸停缸分别引起的测点该谐次角位移矢量差的幅值.在内燃机各缸正常工作情况下,当测点某谐次角位移幅值约等于零时,某缸质量该谐次角振动相对振幅正比于该缸停缸引起的该谐次角位移幅值.对4~8缸柴油机的仿真和实验结果表明,相对振幅识别的最大误差为4.00%.Abstract: A misfiring method for identifying angular vibration mode of ICE(internal combustion engine) crankshaft was proposed based on ICE dynamics and the basic equations about harmonic angular displacements of crankshafts.The relative amplitude of the angular vibration to an order of a cylinder mass is proportional to the amplitude of the phase difference between the angular displacements to the order on the measuring point caused respectively in the normal condition and in misfiring the cylinder.When the angular displacement amplitude to an order on the measuring point is approximately equal to zero in the normal condition of the ICE,the relative amplitude of the angular vibration to the order of a cylinder mass is proportional to the angular displacement amplitude to the order caused by misfiring the cylinder.Simulated and experimental results on 4-8 cylinder diesel engines show that the maximum error of the identified relative amplitude is 4.00%.
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Key words:
- ICE /
- crankshaft /
- angular vibration /
- vibration mode /
- misfiring method /
- identification
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