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采用运行模态分析的方法,辨识出颚式破碎机3向平动模态频率和振型,利用有限元软件NASTRAN六面体单元建立破碎机、混凝土基础的有限元模型;用BUSH单元模拟减振垫刚度特性,选取BUSH单元的3向刚度参数进行灵敏度分析,验证待修正参数选取的可行性;再利用基于灵敏度分析的有限元模型修正技术,参考模态试验辨识结果,对减振垫的3向刚度参数进行修正。修正后,有限元模型计算得到的破碎机3阶刚体模态频率和试验结果完全吻合,同时得到精确的减振垫3向刚度值,可为后续的计算提供准确的有限元模型。
By using the modal analysis, the frequency and mode shape of the 3-direction translational movement of the jaw crusher are discerned. The finite element model of crusher and concrete foundation is established by finite element software NASTRAN hexahedron unit. The stiffness of the vibration damping cushion is simulated by BUSH unit The sensitivity of 3-direction stiffness parameter of BUSH unit is selected to verify the feasibility of selecting the parameters to be corrected. Then, based on the finite element model modification technique based on sensitivity analysis, with reference to the results of modal test identification, the 3-direction stiffness Parameter correction. After the correction, the third-order rigid modal frequencies of the crusher obtained by the finite element model are in good agreement with the experimental results, and the accurate stiffness values of the damping pads are obtained at the same time, which can provide an accurate finite element model for the subsequent calculation.