Design And Characterization Of Artillery Kopin System Optimization

The performance of a large-caliber ultra-lightweight howitzer has been analyzed and optimized based on the modern design theory and method in this thesis. The structure of the novel elevating equilibrator, which is lifted by screw and gas pressure, has also been simulated and optimized.The manual hand crank force of the elevating equilibrator, as one of the most important indicators of the war power of the howitzer, should be taken into consideration during the design process. The mass of the ultra-light howitzer with large diameter barrel is relatively large, and their centroid is general at the front area of the howitzer. So the unbalanced torque is large, which result to the large manual hand crank force. The conventional design method is difficult to reduce the manual hand crank force sharply and efficiently using the method of balancing at two points. It is necessary to utilize the novel method to optimize the manual hand crank force for satisfying the requirements. In order to extend the performance of the elevating equilibrator, it is necessary to optimize the whole system to increase the transmission efficiency. In this paper, the structural parameters mathematic model of the elevating equilibrator has been constructed. The transmission mechanism has been simplified as a planar linkage structure, in which the transmission efficiency of the universal joint can be optimized at the same time. Then the method to calculate gravitational torque has been modified and the force analyses of screw nut have been computed. After that the manual hand crank force has been calculated. A single objective optimal model has been provided for minimizing the maximum manual hand crank force, and multi-island genetic algorithm and Hooke-jeeves direct search algorithm have been both used to solve the optimization model. The result shows that it has achieved the optimal goal and enhanced the operability of the system.The precision of the stiffness of the compensation spring in elevating equilibrator is relative high and its workspace is small. In this thesis, finite method has been used to design this compensation spring, and the stiffness and stress-strain has been met the requirement.To meet the requirement of the lightweight of the howitzer, the structure of the elevating equilibrator has been developed to the form of elongated rod with thin cylinder nested to satisfy the need of light weight howitzer, and the distance of the two fulcrums is much larger than the diameter of the howitzer. Therefore, the buckling analysis of the elevating equilibrator should be performed to validate its stability. In this thesis, the first order buckling factors of the elevating equilibrator when at45°and65°angle have been calculated based on its finite element model. The result shows that the elevating equilibrator will not be buckled under the impact force during the process of emitting.