4Nataraj C, Harsha S P. The effect of bearing cage run- out on the nonlinear dynamics of a rotating shaft[J]. Communications in Nonlinear Science and Numerical Simulation, 2008,13 (4) : 822-838.
5Mei X S, Tsutsumi M, Tao T, et al. Study on the load distribution of ball screws with errors [ J ]. Mechanism and Machine Theory, 2003,38( 11 ) : 1257-1269.