基于广义动态信息模型的机床结合部动刚度参与因子辨识方法

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For the needs of studying the effect of joints on dynamic characteristics of a machine tool and dynamic parameters optimization design in the generalized stiffness field, a concept and identification method of dynamic stiffness participation factors of joints based on the generalized dynamic information model is proposed. The response surface method （RSM） is employed to establish generalized dynamic information models, which depict the relationship between the dynamic stiffness of the spindle nose and the dynamic parameters of joints in the generalized stiffness field. Unit changes of dynamic stiffness of joints are taken as the input vectors of the established response surface model to calculate the variation values of dynamic stiffness of the spindle nose, for the identification of the dynamic stiffness participation factors of joints. Taking a precision horizontal machining center as research objective, the method is applied on the dynamic stiffness participation factors identification and test verification of the linear guide and ball screw of the column-spindle system. Results show that key joints that have relatively significant influence on dynamic characteristics of the machine tool can be identified effectively, to provide technical support for quantitative design of dynamic parameters of joints by this method.针对在广义刚度场中研究结合部对机床动态特性的影响以及动力学参数优化设计的需要，提出一种基于机床广义动态信息模型的结合部动刚度参与因子的概念和辨识计算方法。采用响应面方法（Responsesat＇facemethodology,RSM）建立描述广义刚度场中机床轴端动刚度与结合部动力学参数关系的广义动态信息模型；以结合部动刚度单位变化值为广义动态信息模型的输入量，计算轴端动刚度变化值作为结合部动刚度参与因子的辨识依据。以精密卧式加工中心为对象，将该方法应用于立柱．主轴系统的导轨、滚珠丝杠结合部动刚度参与因子辨识和试验验证。结果表明，该方法可以有效地识别出对机床动态特性影响较大的关键结合部，从而为结合部动力学参数的定量优化设计提供一种技术上支持。