Response Analysis And Optimization Design Of Body Structure Based On Muzzle Shock Wave Protection

The rapid development of modern automotive technology and artillery technology provides a reliable material and technical foundation for the information reform of artillery mobile platform. Truck-mounted howitzer system as the reform’s achievement, which has strong strategic flexibility and relatively low cost advantages. The combination of vehicle and artillery is one that requires important consideration in the howitzer system’s structure design, the main problem is that the gun muzzle blast waves generated by large-caliber howitzer impact on body structure, affecting the general layout and safety performance of the entire system. This paper is the study carried out based on above issues. According to the body structure of a certain type of 122mm truck-mounted howitzer, the impact response of body structure by muzzle blast waves under two different extreme conditions are analyzed through utilizing computational fluid dynamics, finite element transient dynamic analysis and structure topology optimization, combined with the numerical simulation. And targeted to complete the body structure optimization.Firstly, the numerical simulation model of the muzzle blast waves with a muzzle brake is established, and calculated separately under the two limiting emission conditions to obtain the pressure distribution on the main surface of the body. The correctness of model and the accuracy of calculation results is verified through overpressure tests.The accuracy of established finite element model of the body structure is verified by the free modal analysis. Then the body’s transient dynamic response analysis is carried out through loading the average overpressure on main body’s surface by means of uncoupled manner. According to the result of the analysis, the structures that are affected by muzzle blast waves mostly are found.By body structure topology optimization design analysis to identify the area in the body structure that need to strengthen under the impact of muzzle blast waves, the research results of this paper are of important reference value to the design of truck-mounted howitzer’s anti-shock body structure.