关键词: 结合部, 区间参数, 优化, 主动设计, 数控机床

Abstract:

：Prediction of machine dynamics at the design stage is a challenge due to the time-varying configuration, the axis coupling forces and the lack of adequate methods for handling the nonlinearities change of joints. A active design method is proposed for the purpose of the change controlled of CNC machine natural frequency: the nonlinear rigidity parameters of joints are expressed by the interval parameters, and an interval sensitivity method is presented to calculate the machine tool parameter; an accurate calculation method for prediction the change interval of the dynamic properties is set up, which provide a better understanding of the system dynamics; according to the desired vibration mode and their distribution of given system, an interval algorithm and the global optimization algorithm are introduced in the design process and used to determine the allowable variation range of some critical stiffness parameters. Two cases study are conducted to verify the reliability and effectiveness.

Key words: active design, interval parameter, joints, optimization, CNC machine