某轻型牵引炮下架结构动强度设计

Dynamic Strength Design of Bottom Carriage for a Lightweight Towed Howitzer

为研究某轻型炮射击过程中的架体结构动强度问题,基于非线性有限元理论,建立了该轻型炮刚柔耦合动力学非线性有限元模型,模型中考虑了土体本构模型、座圈及方向机刚度、结构-土壤相互作用、架体-销轴接触等非线性关系。计算获取了该轻型炮4种射击工况下的下架、后大架及连接销轴的动态应力分布规律,找出了原下架结构方案中强度设计的薄弱环节,并提出了下架结构的改进方案。计算结果表明:改进后下架结构最大应力值降幅达42.7%,且下架质量减少了10kg。计算结果对指导该轻型炮下架结构设计具有一定的工程应用价值。

In order to study the dynamic strength of carriage for a lightweight howitzer during firing,a rigid-flexible coupling dynamics nonlinear finite element model of the howitzer was built based on the nonlinear finite element theory.The nonlinear relations of soil constitutive model,stiffness of turret race and traversing mechanism,interaction between structure and soil and contact between carriage and pins were considered simultaneously in the model.Dynamic stress distribution law of bottom carriage,rear trial and pins in four firing conditions of the lightweight howitzer were calculated,bottlenecks in strength design of original bottom carriage were found,and a modified structure of bottom carriage was proposed.The calculation results show that the maximum stress of modified bottom carriage reduces 42.7% and the weight reduces 10 kg.The results show its important engineering value for the design of bottom carriage of the lightweight howitzer.