双轴车辆俯仰振动及凸块路面平顺性仿真研究  

Analysis of Pitching Vibration and Bump Road Ride Comfort About Double Axles Vehicle

作　　者：高晋[1] 杨秀建[1] 牛子孺[1] 陈蜀乔[1] 

机构地区：[1]昆明理工大学交通工程学院,昆明650500

出　　处：《重庆理工大学学报（自然科学）》2015年第9期20-29,共10页Journal of Chongqing University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(51465023);昆明理工大学校人才培养项目(省级)(KKSY201402065)

摘　　要：建立了双轴车辆仿真模型,在模型前后轮上加载有时间延迟的正弦波激励以模拟汽车的俯仰振动情况。仿真计算出轴距中心处车身的垂向加速度和俯仰角加速度折算幅频特性曲线。分析幅频特性曲线得出车身纯垂直振动和纯角振动的激励频率以及幅频特性曲线的频率间隔,确定敏感的振动频率。改变样机模型的轴距和前后轮输入的相位差,分析轴距和车速对幅频特性曲线的影响。结果表明:车速减小,轴距变大,幅频特性曲线的频率间隔减小。由垂向加速度和俯仰角加速度幅频特性曲线计算出加速度均方根值,得出沿车身纵轴线方向不同位置的加速度均方根值,为确定最佳座位点提供依据。分析仿真模型通过凸块路面时的加速度均方根值变化量,结果表明:前后脚部地板纵向加速度都是在后轮通过时较大,而前后脚部地板垂向加速度则分别对应前后轮通过时较大。A double axles vehicle model with was established. Pitching vibration was simulated by loading Sine wave excitation with time delay on front and rear wheel of the model. The conversion am- plitude-frequency characteristics curve of vertical acceleration and pitching angular acceleration in the middle of wheelbase were computed. The amplitude-frequency characteristics curves were analyzed, finding out excitation frequency of exclusive vertical and pitching vibration and frequency interval of the curves to ascertain sensitive vibration frequency. With the changing wheelbase of the model and phase difference, we studied the influence of wheelbase and speed on the amplitude-frequency charac-teristics curves. The results show that reducing speed and lengthening wheelbase will increase fre- quency interval of the amplitude-frequency characteristics curves. Computing acceleration Rms of body at different longitudinal position by amplitude-frequency characteristics curves of vertical acceler- ation and pitching angular acceleration can provide design reference of optimal seat position. Accord- ing to simulation analysis results of acceleration Rms of front and rear floor, longitudinal acceleration of front and rear floor is larger when rear wheel passing, but larger vertical acceleration of front or rear floor is separately when corresponding front wheel or rear wheel passing.

关 键 词：平顺性 俯仰振动 凸块路面 双轴车辆 

分 类 号：U463.33[机械工程—车辆工程]