半挂牵引车车架疲劳可靠性分析及优化

首先建立车架几何模型以及相应的有限元分析模型,分析车架的强度与刚度。在Adams中建立车架的多体动力学模型,计算求出悬架与车架连接处的动态外载荷作为车架疲劳仿真分析的载荷谱。在疲劳可靠性分析软件Fatigue中,通过准静态疲劳寿命分析方法计算出车架的疲劳寿命。利用粒子群多目标优化算法,以车架的各纵横梁为设计变量,以车架的较低应力和较轻质量为优化目标,选取较为合理的车架纵、横梁设计尺寸。结果显示优化后车架满足强度要求,质量减轻了近20 kg,疲劳寿命也提高了8.6%。该分析方法既可用于车架的抗疲劳设计等问题研究,也为其他工程实际问题提供了设计参考依据。

Analysis and optimization of semi-trailer tractor frame on fatigue reliability

Analyzing the strength and stiffness of the frame through finite element analysis model. The dynamic model is used to calculate the dynamic external load in the joint of suspension and frame. Calculating the fatigue life of frame through the quasi-static fatigue life analysis method. Then the multi-objective optimization based on particle swarm algorithm is proposed.The vertical and horizontal beams of the frame are used as design variables, and the lower stress and lighter quality are the optimization goals. Comparing the fatigue life between the optimized frame and the original frame. It can be found that the optimized frame has a greater strength, lighter quality and the frame fatigue life is increased by 8.6%. This analysis method can be used to solve the problem of anti-fatigue design and it also can be used to provide a design reference for other practical engineering problems.