Design Optimization Of Artillery Carriage And Vibration Absorber For Firing Accuracy Improvement

Traditional artillery design mainly relies on experience of designers and design criterion, the whole process of research and development use the route "Design-Manufacture-Test-Modify", so it always has long development cycle and high design cost. But beyond that, during modify stage, designers make the modification primarily by subjective experience, while lacking theoretical direction, so there are many problems such as large structure weight and low firing accuracy. How to improve the performance of artillery and shorten the development cycle has become an important subject in the study of artillery, the CAE technology can effectively evaluate the performance of the artillery. The structural optimization and other advanced design theory can provide directional guidance for artillery design, lighten the structural weight while ensure the firing accuracy of the artillery. Based on CAE technology and structural optimization theory, researching design theory and method to gain the artillery structure with high accuracy and light weight, building design platform and designing the structure is the key issue of artillery research. In this paper, a parametric design system of typical artillery parts is established, and in order to improve the firing accuracy, innovation design research of the cradle and the absorber is carried out. The specific research contents are as follows:1.The parametric modeling and design system for typical parts of artillery is established. Based on Nastran and Patran, use the secondary development technique to develop the parametric CAE modeling and design system. With this system, designers can complete lots of work such as modeling, model changing, analysis, and optimization design, through simply inputting predefined parameters. It can effectively enhance the work efficiency, and provide software tool for modification and design of the typical artillery parts.2.The lightweight design of the cradle of the artillery was carried out. In traditional design scheme, the size and layout of the artillery are determined generally in accordance with the specification and the experience of designers. The design scheme is always conservative, the performance of the artillery can be guaranteed, but the mass is often larger, which could cause poor mobility and flexibility. In this paper, selecting the cradle of a typical artillery as study object, a topology optimization design model of the cradle structure combined casting constraints is carried out to minimize the displacement of some key point which is closely related to the firing accuracy. Based on the topology optimization design model, the innovative design structure was achieved through two step optimization. The innovative design successfully improve the shooting precision of the artillery and reduce the structure weight, meanwhile, as a result of considering the casting constraints, the innovative design structure is easy to manufacture.3.The absorber design of the artillery barrel is presented. In firing process, the muzzle vibration has a great influence on the shooting accuracy, the shooting dispersion is directly related to the vibration amplitude. For the low accuracy problem caused by the violent vibration of the muzzle, a dynamic analysis has been done and the displacement history curve of the muzzle has been achieved. Then the absorber design is presented, the influence of the absorber of the muzzle vibration is analyzed. Finally, by optimizing installation position and structure parameters of shock absorber, the optimal design of absorber is gained. The optimal absorber successfully reduce the muzzle vibration amplitude when shooting, effectively improve the firing accuracy of the artillery.