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将滚动直线导轨副可动结合部视为一个独立无质量的八结点六面体单元,且每个结点之间相互耦合,在此基础上利用刚度影响系数法建立其动力学模型.采用实验模态分析与有限元分析相结合手段,通过非线性最小二乘法的优化方法对动力学参数进行了识别.利用振型相似进行固有频率的比较和分析,计算结果与模态试验结果符合,验证了模型的有效性,为数控机床整机动力学精确建模提供了理论基础.
Considering the movable joint of rolling linear guideway as an independent massless hexagonal hexahedron element, and each node is coupled with each other, based on this, the dynamic model is established by using stiffness influence coefficient method.Using experimental model State analysis and finite element analysis were used to identify the dynamic parameters through the nonlinear least square method optimization method.The natural frequencies were compared and analyzed by mode shape similarity.The calculated results were consistent with the modal test results and verified The validity of the model provides a theoretical basis for accurate modeling of the complete machine dynamics of a CNC machine tool.