螺栓组拧紧顺序对结构体接触刚度的影响研究

摘要

针对螺栓连接结构体接触刚度受拧紧顺序影响机理研究存在的不足，首先建立了单螺栓拧紧扭矩T与结合面刚度K的关联模型；然后在ANSYS中仿真分析了不同拧紧顺序下结合面模态频率特征，根据频率f与结合面刚度K之间的映射关系，进而得出最佳拧紧顺序；最后利用实验进行验证。结果表明，不同拧紧顺序结合面等效刚度K不同，结构的一阶固有频率也随之改变，同时拧紧最优、对角拧紧次之、顺序拧紧最差，说明拧紧顺序与固有频率之间存在着非线性关系。仿真分析与测试得到的一阶模态频率间的误差较小，证明了该建模方法能够有效分析拧紧顺序对结合面动力学性能的影响。%According to the existence problems of study on the mechanism of contact stiffness of bolted as-sembly structure formed by tightening sequence ( TS ) , a TK model of single bolt structure is established;then the frequency characteristics of combined surface under different TS was analyzed by using ANSYS;the optimal TS is obtained based on the frequency and the interface stiffness mapping. At last, a group of experiments was done to verify the above conclusions. The results show that the interface stiffness is verify under different TS, and so does the first rank natural frequency of the structure;the nonlinear response of the structure is significantly affected by TS that tighten at the same time is the optimal method compared with other TS. A small error of modal frequency between simulating and testing proves that the modeling method can effectively analyze impacts of the TS on the dynamic properties of the interface.