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对车桥耦合振动研究中轮轨关系的线性方法进行了改进，提出考虑三维非线性轮轨接触几何，采用迭代法求解法向力和蠕滑系数。
The linear method for the wheel-rail relationship in the study of vehicle-bridge coupling vibration is improved. The contact geometry of the three-dimensional non-linear wheel and rail is considered. The iterative method is used to solve the normal force and creep coefficient.