Abstract:A three-dimensional model of a planetary roller screw is built by the Pro/Engineer software. Based on the finite element analysis, the modal analysis and harmonic response analysis of the planetary roller screw are performed. Through the above analysis, the planetary roller screw’s six order inherent frequencies and modal vibration shape diagrams are obtained and the resonant frequencies are confirmed. These results were used to investigate the planetary roller screw’s displacement peak responses of the corresponding frequency and to study the influence of the inherent frequencies caused by the different working position of the nut. The above studies and data can be used to support the anti-vibration design of the rudder system based on the planetary roller screw.