基于工况传递路径分析的挖掘机座椅振动研究

摘要

The vibration of a new type of excavator prototype was inspected,and the vibration transmission from the engine to the cab seat was analyzed.The singular value decomposition (SVD)technique was applied to improve the method of operational transfer path analysis (OTPA).With the vibration test data under working condition,an OTPA model of vibration from the engine to the cab seat was built.The frequency domain features of the synthesized output signal agree well with those of the test output signal,so the model is proved valid.The key frequencies were revealed by analysing the synthesized output signal.The path necessary to be improved was identified in the light of all paths'vibration contribution spectrum and vector diagrams.Some specific improvements were proposed in accordance with the spectrum analysis of transmissibility function and acceleration.The research provides an efficient engineering reference to noise or vibration transmission control.%以某挖掘机新产品试验车为对象，研究发动机到驾驶室座椅的振动传递情况。应用奇异值分解技术对工况传递路径分析方法进行了改进，并采集运行工况试验的振动数据，建立了从发动机振动到驾驶室座椅振动的工况传递路径分析模型。对比座椅安装位置加速度的模型合成信号与实测信号的频域特征，研究发现两者吻合较好，从而验证了模型的正确性。对模型合成的输出信号进行频域分析，可以直观的研究需要关心的频率。结合各路径的振动贡献频谱图与矢量图，找出特定频率处需要改进的路径。最后利用传递率函数频谱图和输入加速度频谱图，提出具体的改进方法，为解决振动噪声传递类问题，提供了工程参考。