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根据动力学有效模型原则,确定了丝杠轴和螺母的有限元单元类型和单元尺寸,其中丝杠轴的螺纹部分采用了质量矩阵和刚度矩阵参数不同的特殊梁单元,以模拟由于螺纹造成的刚度损失.比较了丝杠轴有限元模型与用有限元软件自由划分的丝杠轴模型的计算结果,证明了本研究所用有限元模型的精确性.通过子结构的离散说明了滚珠丝杠结合部的简化处理方式,并通过频响函数法识别了结合部的动力学参数.比较螺母在不同位置处的模态试验结果与相应的模型仿真结果,误差和不超过4%,证明了本模型的有效性.
According to the principle of dynamic effective model, the finite element unit type and unit size of the screw shaft and nut are determined. The screw part of the screw shaft adopts a special beam element with different mass matrix and stiffness matrix parameters to simulate the effect caused by the thread Stiffness loss.Compared the finite element model of the screw shaft and the screw shaft model which is discretized by the finite element software, the accuracy of the finite element model used in this study is proved.Division of the ball screw combination Min, and the dynamic parameters of joint were identified by frequency response function method.Comparing the results of modal test at different positions with the corresponding model simulation results, the error is less than 4%, which proves that this model Effectiveness.