本文给出了一种改进的动态子结构法，并用该方法分析内燃机复杂轴系扭转振动问题。
In this paper, an improved dynamic substructures method is described. The problem of torsional vibration of diesel complex shafting is analysed with this new method.
为了研究此系统的扭转振动，运用拉格朗日方程和假设模态法建立了系统的动力学方程。
To investigate the torsional vibration of the system, the dynamics governing equations of the system is established using the Lagrange equation and the assumed mode method.
同时在试验过程中采用四点响应信号综合评估法，证实能有效地分离出混杂在扭转振动信号中的弯曲振动的频率成分，提高了结果的准确性。
In the experiment, 4 signals are evaluated synthetically to separate the bending component intermixed in the torsional vibration so as to improve the accuracy of test results.
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