Abstract:

Inspired by the biomechanical mechanism of locust jumping, an ejection device with joint torsion spring and double trapezoidal structure is designed, which has the ability to achieve large ejection stroke for low thrust demand and keeps the characteristics of initial bow angular velocity and angle during missile separation. The efficient mechanism layout parameters are optimized by the optimization methods based on parameterized models and Kriging surrogate models. The influence of arm flexibility effect on missile ejection separation parameters during launch is studied based on a rigid-flexible coupling dynamic model. The projectile-machine, separation process is investigated based on computational fluid dynamics. The research results indicate that the optimization method based on parameterized models and Kriging surrogate models can be used to quickly obtain the mechanism parameters that meet the design requirements. In the process of ejection, the flexible deformation of middle arm will lead to the difference between the actual separation parameters and the ideal design parameters. The flexible effect cannot be ignored in the detail optimization design, and the structural stiffness should be increased to reduce the design deviation. The given design example can meet the design criteria and the missile can be safely separated, proving the effectiveness of the new design in this paper.

Key words: missile ejection device, bionics, Kriging surrogate model, rigid-flexible coupling, emission dynamics