固体姿轨控发动机十字型测力台设计及优化

To accurately measure the thrust of solid attitude and orbit control motors，a twelve-component thrust measurement stand with a cross-shaped configuration and centrally symmetric structure was designed. Taking into account the structural deformation under load，a static mechanical model of the thrust stand was established，deriving the calculation formulas for the forces on each sensor relative to the motor’s applied loads. To evaluate the dynamic performance of the thrust stand，a dynamic model of undamped free vibration was constructed. Finite element simulation was employed to verify the established static and dynamic models，as well as to assess the cross-force experienced by the system. Based on the established static and dynamic models，a multi-objective optimization model was formulated with the goals of maximizing static sensitivity and minimizing the relative error in frequency response amplitude. The design variables included the diameter of the force measurement rods and the sectional dimensions of the movable frame. Using the Particle Swarm Optimization（PSO）algorithm，the structural parameters of the thrust stand were optimized. After optimization，the static sensitivity decreased by 5.2%. For a thrust with a vibration frequency of 30 Hz，the relative error in dynamic response amplitude for force measurement in the xy plane decreased by 53.9%，the relative error in dynamic response amplitude for torque measurement along the x，y axis decreased by 97.6%，and the relative error in dynamic response amplitude for torque measurement along the z axis decreased by 95.1%.