Vibration Analysis and Structure Design for Fixed-Trim Moving Mass Reentry Vehicles

In this paper, a complete attitude-servo dynamics model, including the deflection dynamics of the slider, is established to address the structural parameter design problem for a class of fixed-trim high-mass-ratio moving mass reentry vehicles (MMRVs). The dynamics coupling analysis reveals that the deflection of the slider will affect the yaw attitude while used for roll-attitude actuation, which could lead to a decrease in guidance performance and even instability of attitude control. In concern with the relation between system performance and configuration design, the steady-state analytical expression of the deflection-attitude coupled nonlinear system is derived via the multiple scales method, and the amplitude-frequency response characteristics are analyzed under different configuration parameters. On this basis, a configuration design scheme for fixedtrim high-mass-ratio MMRVs with consideration of roll-yaw coupling is provided, where the configuration parameters can be designed to reduce the yaw interference caused by roll maneuver and thereby improve the system performance. © The Institution of Engineering & Technology 2023.