| The reliability of unlocking and separation during missile launching is a design challenge for canister front cover. An ejection cover with low impact, which contains a spring to store impact energies and an inclined plate to change the direction of separation force, is proposed to solve this challenge problem. Considering the separation process of this cover, a dynamic model is built to predict the cover separation trajectory, and two criterions are put forward to judge the reliability of separation. The result shows that the separation trajectory meets the requirements of the reliable separation criterions. The initial design parameters selected for the canister front cover are reasonable.Then some typical design parameters influencing separation characteristics, including the angle of inclined plate, the stiffness and the compression length of the spring, are investigated in detail based on experimental design method and response surface method to achieve optimization results that satisfy the reliable separation criterions. The result shows that the contact force of the front cover with optimized parameters decreases by 28.5%, the action time of the force is longer and the variation tendency is slower. Therefore, the security of the missile improves a lot. Furthermore, the height of the cover apart from the ground increased by 4.2% to insure the security of the launcher and personnel.Due to the high cost and long period of the design and experiment for a physical prototype, the virtual prototype experiment based on the multi-body dynamics model is utilized to verify the cover separation process. The result shows that the height error of the cover is less than 0.85% which indicates the front cover with optimized parameters could separate reliably for missile launching, and the dynamic model prediction the separating trajectory is reasonable. Finally, the structure of the canister cover is designed according to the design scheme and the optimized parameters. |
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