本文讨论内燃机曲轴-飞轮系统扭转振动的复模态分析。首先概述了传递函数及复模态分析的基本理论;然后,选用单点稳态正弦激励,多点同时测量的测试方案进行测试;最后,用频响函数多模态曲线拟合法,结合一维寻优进行参数识别,建立了系统的模态模型。 This paper discusses the complex modal analysis of the torsional vibration of the crankshaft-flywheel system of an internal combustion engine. Firstly, the basic theory of transfer function and complex modal analysis is summarized; then, a single-point steady-state sinusoidal excitation and multi-point simultaneous measurement test scheme are selected for testing; finally, a multi-modal curve fitting method with frequency response function is used to combine the one-dimensional The optimization of the parameters was identified and a modal model of the system was established.