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以电机直连滚珠丝杠工作台式进给系统为研究对象,滑动导轨处摩擦采用Stribeck摩擦模型,将系统简化为含摩擦的单自由度力学模型。借助数值仿真和快速傅里叶变换获得了工作台发生爬行时,爬行频率与驱动速度之间的二次函数关系,提出了临界爬行速度的爬行频率辨识法,并通过大量数值仿真,获得了阻尼、刚度、静动态摩擦系数差及Stribeck速度等参数对爬行频率的影响规律,为今后进给系统的结构和摩擦参数辨识提供了研究基础。
Taking the motor direct-coupled ball screw table feed system as the research object, the Stribeck friction model is adopted for the friction on the sliding guide rail, which simplifies the system to a one-degree-of-freedom mechanical model with friction. The quadratic function relationship between crawling frequency and driving speed was obtained by numerical simulation and fast Fourier transform. The creeping frequency identification method of critical crawling speed was proposed. Through numerical simulation, damping , Stiffness, static and dynamic friction coefficient difference and Stribeck velocity on the creep frequency, which provide the research foundation for the structure and friction parameter identification of the feed system in the future.