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本文应用SUMT方法,在路面随机激励时,对两自由度车辆悬挂系统进行优化设计。首先对优化设计进行了简要回顾,特别是对SUMT(序列无约束极小化方法)法作了介绍。其次对两自由度车辆振动系统进行了分析,对路面谱密度和车辆平顺性指标作了概述。在此基础上,建立了优化计算的目标函数和约束条件,并结合BJ—633旅游车进行了优化计算,得到了有实用意义的结果。经对比试验表明,根据优化设计所得参数改进悬架后,车辆的平顺性得到明显的改善。
In this paper, the SUMT method is used to optimize the two-degree-of-freedom vehicle suspension system when the road surface is randomly excited. First, a brief review of optimization design is made, especially the SUMT (Sequence Unconstrained Minimization Method) method is introduced. Secondly, the vibration system of two degrees of freedom vehicle was analyzed, and the indexes of road surface density and vehicle ride comfort were summarized. On this basis, the objective function and constraint conditions for optimization calculation are established. Combining with the BJ-633 coach, the optimization calculation is carried out and practical results are obtained. The comparative tests show that, according to the parameters of the optimized design to improve the suspension, the vehicle ride has been significantly improved.