Research on heading sensitive drift storage behavior of inertial platform system under the action of assembly stress relaxation

In this paper, firstly, the relaxation mechanism and change law of the assembly stress of inertial platform and bearing assembly structure was thoroughly analyzed, theoretical model was derived and identified by experiment. Secondly, the change law of bearing contact angle under the action of assembly stress relaxation was obtained. On that basis, the bearing contact stiffness mechanism model and the damping change mechanism model of the assembly structure of inertial platform and bearing were derived. Thirdly, the variation mechanism of inertial platform system vibration transmissibility caused by the contact stiffness and damping mechanism models was thoroughly researched by the kinematic differential equation of inertial platform system, and then heading sensitive drift behavior model of inertial platform system influenced by the contact stiffness and damping of the assembly structure was obtained. Finally, the established heading sensitive drift behavior model was verified by the comparative analysis of actual storage data, and simulation data according to the established model of inertial platform system, and the long-term drift characteristics, acceleration characteristics and storage stability characteristics of heading sensitive drift storage behavior were thoroughly analyzed under the long-term storage condition.