Parametric Design And Optimization Of A Large Caliber Gun

Elevating equilibrator is one of the important parts of artillery, playing the roles of elevating mechanism and balancing mechanism. Therefore, based on the modern design theory and method, this article has carried on a series of works on elevating equilibrator, such as project design, parametric design, optimization design and dynamic simulation analysis.According to the general requirements and the known conditions of the artillery, the structure and dimensions of the hydro-pneumatic elevating equilibrator are determined by analysis and comparisons. The spare parts are modeled and then assembled in Pro/E, then the strength and stabilities of both the outer and the middle cylinder of the elevating equilibrator are checked. Meantime, based on the secondary development tool Automation Gateway of Pro/E, the parametric design of the hydro-pneumatic elevating equilibrator is achieved by using VB, and the efficiency of the elevating equilibrator design is improved effectively.Based on the parametric model of the elevating equilibrator, in order to solve the question of the elevating handwheel force is too large when elevation angle becomes higher and the tipping part can impact and beat when elevation angle becomes lower, MATLAB is used to build the mathematical model which taking the maximum unbalance torque as objective function within the whole elevation coverage firstly. Then combining the optimization method of Multi-Island GA and NLPQL in ISIGHT to calculate the optimization design of hydro-pneumatic elevating equilibrator. The result shows that this combinatorial optimization method can effectively reduce the maximum unbalanced torque of elevating equilibrator and improves its working performance.The equivalent stiffness of the hydraulic oil inside the elevating equilibrator in different fire angle is determined by calculation, and the dynamic simulation model of the upper carriage and the parts on it are modeled in ADAMS, then the vertical disturbance responses of the gun muzzle and the force of the trunnion block and the lower mounting section of the elevating equilibrator in different fire angle are obtained by simulation, and then the performance of the elevating equilibrator during the firing process is verified.