Structural Optimization Of Lower Frame Of A Light Traction Gun

Structural optimization is one of the advanced approaches to design howitzer parts.Take a lightweight towed howitzer lower frame body as the research object,research the application of structural optimization methods in the key components of howitzer about the back-trail?undercarriage?front-trail,solve the problem existing at the lower part of the frame body.Research contents are:(1)Establish a howitzer dynamic finite element model,based on the lumped parameter model to simulate the interaction relationship between the lower frame body and soil.Select five different kinds of stiffness and damping of soil type,obtain the lower frame body of dynamic response in different soil conditions.The results also found that the maximum stress value of the back-trail is larger and the low utilization rate of the materials of undercarriage,the support stiffness of lower frame body has problem.(2)Study back-trail finite element model of weld,determine the frame finite element model with weld.on this basis,using the deterministic optimization in the back-trail structure to reduce the back-trail stress,in view of the problem which the deterministic optimization results has the low reliability and robustness.In this paper,the result of deterministic optimization design is chosen as the initial design point,and its robustness is optimized.Through the optimization of back-trail structure,reduce the maximum stress value?improve the structure stability and reliability.(3)Through the sensitivity analysis,select the design variables which has a larger impact on support rigidity of lower frame body,aiming at the largest support stiffness for the lower frame body,based on parametric optimization method to optimize a lower frame body size parameters of the composite,construct the highest accuracy of the RBF approximation model,select the multi-Island genetic algorithm on the lower part of the frame brace stiffness optimization,greatly improving the lower frame support stiffness.(4)According to the lightweight design of undercarriage of the lightweight towed howitzer,the FE model of artillery undercarriage structure at three typical fire angle working conditions was established.Through calculation and analysis known:maximum stress and deformation of undercarriage was small and the space to light weight was big.Inspired from traditional stratified sequence method,modified stratified sequence method was presented to light weight of undercarriage at different working conditions.Stratified Sequence Method of undercarriage at three working conditions and transmittal mode of constraint condition between them stated at length in this article,utilized topological method to get the best material distribution,and at last the result of the lightweight design certified this method was valid.