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Harmonic response analysis and research of bus body based on the modal shapes

机译：基于模态形状的车身谐波响应分析与研究

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The finite element model of the bus body is built in ANSYS software, and the finite element model was validated by stress tests. The mode shapes and the natural frequencies of the bus body determine its dynamic response properties, such as the transmission of vibration from the engine. The modal analysis is performed by using the ANSYS. Through the preliminary analysis of the modal shape and frequency of the bus body, it was deduced that the second-order excitation of engine may be the root cause of the bus body vibration at idle. The inertia force and moment are calculated by the simulation formula and bus engine parameters. The results are used as the engine idle excitation inputs, then the harmonic response analysis is carried out. The modal analysis is verified by the harmonic response analysis of the sample bus. According to the modal analysis of the finite element model of bus body and the harmonic response of sample bus it is concluded that the second-order excitation of the engine is the excitation source of the bus body vibration at idle. The results of the research provide a design method of bus body and some measures are proposed for designers to improve design reliability and reduce vibration for a new bus.
机译：在ANSYS软件中建立了车身的有限元模型，并通过压力测试验证了该有限元模型。车身的模态形状和固有频率决定了其动态响应特性，例如发动机振动的传递。模态分析是通过使用ANSYS进行的。通过对车身模态形状和频率的初步分析，可以推断出发动机的二次激励可能是怠速时车身振动的根本原因。通过仿真公式和客车发动机参数计算出惯性力和力矩。将结果用作发动机怠速激励输入，然后进行谐波响应分析。模态分析通过样本总线的谐波响应分析进行验证。通过对车体有限元模型的模态分析和样车的谐波响应，得出结论：发动机的二次激励是怠速时车体振动的激励源。研究结果提供了一种车身设计方法，并为设计人员提出了提高新车设计可靠性和减少振动的措施。

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