单列向心球轴承引发的非线性振动分析

Analysis of nonlinear vibration induced by single radial ball bearing

根据滚珠轴承结构特点,研究单列向心球轴承转子系统运行过程中由轴承支承刚度变化引起的参数振动,并分析由轴承制造误差和安装误差造成的一系列强迫振动,总结系统中轴承引起的各类非线性振动的振动频率成分,最后在120MD60Y6型号电主轴上进行振动测试,对振动信号进行滤波提纯和频谱分析,结果表明:在低速条件下,单列向心球轴承引发的各种振动频率成分所占比重较大,其幅值随着转速的增加发生细微变化,但其幅值比重急剧下降。

Beginning with the structural characteristics of ball bearings, the parametric vibration of single radial ball bearing-rotor system, which is induced by the varying compliance vibration, is studied through the analysis of the stress state in bearing, then a series of forced vibrations caused by the manufacture error and the installation deflection of the bearing are analyzed, and different frequency components of the nonlinear vibration result from rolling bearing are summarized. Finally, a validation test is carried out on a 120MD60Y6-type motorized spindle, and vibration signals are purified with the use of the low-pass filtering and band-pass filtering. The results from the spectrum analysis show that the vibration frequency components produced by the single radial ball bearing take a large proportion in vibration signals at low speed. With the rise of the rotational speed, the amplitudes of these vibration frequency components vary slightly, meanwhile the proportion of their amplitudes in vibration signals decrease abruptly. These conclusions are useful to the fault diagnosis and the dynamic analysis of rolling bearingrotor system.