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为了在初始设计阶段预测车辆平顺性、优化设计方案,建立考虑车架柔性的6×4商用车半车振动模型,进行随机输入行驶模拟试验,分析了车架弯曲、驾驶室悬置、发动机悬置及座椅悬置对整车平顺性的影响.利用假设模态方法建立车架弯曲模型,分析了车架柔性对整车平顺性的影响.通过灵敏度分析评价车辆主要参数对平顺性的影响,最后用模拟退火粒子群优化算法进行悬架和驾驶室悬置参数的优化匹配.仿真结果表明,前轴的悬架刚度和车架的第一阶弯曲振动对整车平顺性的影响很大,驾驶室悬置和座椅悬置对平顺性的贡献量最大.
In order to predict vehicle ride comfort in the initial design stage and optimize the design scheme, a semi-vehicle vibration model of 6 × 4 commercial vehicle considering the flexibility of the frame was established to carry out random input driving simulation test. The effects of frame bending, cab suspension, And the influence of seat suspension on the ride comfort of the vehicle.Using modal method to establish the frame bending model and analyze the effect of frame flexibility on vehicle ride comfort.Analysis of the impact of main vehicle parameters on ride comfort by sensitivity analysis , And finally simulated annealing particle swarm optimization algorithm for optimal matching of suspension and cab suspension parameters.The simulation results show that the stiffness of the front axle and the first-order flexural vibration of the frame have a great impact on vehicle ride comfort , Cab suspension and seat suspension contribute most to ride comfort.