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采用高频电液伺服激振系统进行了一种中型货车和一种轻型各车的动力总成弯曲振动实验模态分析，在动力总成处于正常技术状态下进行了垂直方向和水平侧向的激振实验分析，还模拟汽车实际使用过程中可能出现的一些不正常技术状况，以不同方式改变动力总成的结构连接刚度和安装支承刚度后进行了激振实验分析。还对改变激振力幅值和激振作动器运动质量对实验模态分析结果的影响等实验技术问题进行了实验探讨。本文的结果对汽车动力总成弯曲振动实验模态分析及其振动控制具有实际意义。
A high-frequency electro-hydraulic servo excitation system was used to test the flexural vibration modes of a powertrain in a mid-size truck and a light truck. When the powertrain was under normal technical conditions, the vertical and horizontal lateral Excitation experiment analysis, but also simulate the actual use of the car may occur some of the abnormal technical conditions in different ways to change the powertrain structural connection stiffness and installation support stiffness after the vibration experiment analysis. The experimental techniques such as changing the amplitude of the exciting force and the influence of the vibration quality of the actuator on the experimental modal analysis were also discussed. The results of this paper have practical significance for the experimental modal analysis and vibration control of the bending test of vehicle powertrain.