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为提升机床的动态特性,进而提高机床加工精度,稳定性和抗振性,首先对某机床进行模态试验,分别采用最小二乘复指数法和最小二乘复频域法识别模态参数,并对识别结果和识别效果进行对比分析,得出准确的低阶固有频率,阻尼比和模态振型。再根据振型分析确定了机床加工精度低的主要原因和薄弱环节,并提出相应的改进意见,为动力学优化设计指明方向。
In order to improve the dynamic characteristics of the machine tool, and then improve the machine tool machining accuracy, stability and vibration resistance, a machine tool was first modeled experimentally, using the least square complex exponential method and the least squares complex frequency domain method to identify modal parameters, The contrast between recognition result and recognition result is compared to get the accurate low-order natural frequency, damping ratio and mode shape. According to the vibration mode analysis, the main reason and the weak link of the low machining precision of the machine tool are determined, and the corresponding improvement suggestions are put forward to indicate the direction for the dynamic optimization design.