陶瓷电主轴固有频率影响因素灵敏度分析

Sensitivity Analysis of Factors Affecting the Natural Frequencies of Ceramic Motorized Spindle

目的建立陶瓷电主轴有限元正交分析模型,研究3个影响因素对陶瓷电主轴固有频率的影响规律.方法通过有限元建模计算和实验验证,对陶瓷电主轴的固有频率进行求解,并基于正交分析法,对陶瓷电主轴的固有频率随轴承刚度、空心转轴的中心孔直径和支撑跨距3个主要参量变化的趋势进行研究.结果不同因素对陶瓷电主轴的固有频率的影响有较大差别,其中轴承刚度对陶瓷电主轴的固有频率影响较大,空心转轴的中心孔直径的影响稍大于支撑跨距的影响,但二者差距不明显,且二者对陶瓷电主轴固有频率的影响都较轴承刚度小.结论实验结果与有限元分析结果吻合程度较高,建立的模型能准确地模拟陶瓷电主轴,可以用于变参计算.

The finite element orthogonal analysis model of ceramic motorized spindle was established to study the influence of three factors on the natural frequency of ceramic spindle.Through finite element modeling calculation and experimental verification,the natural frequency of ceramic motorized spindle is solved.Based on orthogonal analysis,the natural frequency of ceramic spindle with bearing stiffness is analyzed.The variation trend of the central hole diameter and support span of the hollow shaft is studied.The influence of different factors on the natural frequency of the ceramic motorized spindle is quite different.The bearing stiffness has a greater influence on the natural frequency of the ceramic motorized spindle,and the influence of the diameter of the center hole of the hollow shaft is slightly greater than that of the support span.However,the difference between them is not obvious,and the influence of them on the natural frequency of ceramic spindle is smaller than that of bearing stiffness.The experimental results are in good agreement with the results of finite element analysis.The established model can accurately simulate the ceramic motorized spindle and can be used to calculate the variable parameters.