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扭转振动是发动机一个重要的动力问题。本文用模态分析方法研究曲轴系统扭转振动。已经证明,曲轴系统扭转模态与车自由度扭振系统是等效的。进一步讨论曲轴系统扭振模态试验方法,指出用线加速度传感器测量扭振响应是行之有效的和说明如何分离曲轴系统扭振模态。本文最后根据扭振模态原理,建立模态频率响应函数,应用模态数据确定发动机临界转速,计算曲轴扭振变形、应力和截面扭矩等响应。
Torsional vibration is an important motivation for the engine. In this paper, the modal analysis method is used to study torsional vibration of crankshaft system. It has been demonstrated that the torsional system of the crankshaft system is equivalent to the torsional vibration system of the vehicle. Further discussion of the torsional vibration mode test method of crankshaft system shows that it is effective to measure the torsional vibration response with a linear acceleration sensor and how to separate the torsional vibration mode of the crankshaft system. Based on the principle of torsional vibration mode, the modal frequency response function is established. The modal data is used to determine the critical speed of engine, and the response of crankshaft torsional vibration, stress and cross-section torque are calculated.