基于路面激励的动力总成受振特性分析及评价

为探求路面激励下车辆动力总成的受振特性，以动力总成质心振动加速度和相对振动位移为评价指标，建立了包含有6自由度动力总成模型的13自由度整车模型.以某等级道路轮廓和发动机自身振动为激励，分别进行了车速为60、45和30km/h的动力总成受振状态数值计算，分析了不同车速下动力总成的受振特点，并在振动加速度分析时提出了采用全程平均振动加速度的分析方法.研究结果表明：在同一路面轮廓下，车速越高则动力总成的质心振动加速度和相对振动位移越大，而各车速下动力总成偏转角度差别不大.

Vibration characteristic analysis and evaluation of powertrain based on road excitation

n order to investigate the vibration characteristics of vehicle powertrain under road excitation, the centroid vibration acceleration and relative vibration displacement of the powertrain were suggested as the evaluation indexes, and a full vehicle model with 13 freedom degrees containing the powertrain model with 6 freedom degrees was established. The numerical calculation of powertrain vibration states under the excitations of a certain class road profile and engine vibration was performed at the vehicle velocities of 60, 45 and 30km/h. The powertrain vibration characteristics at different velocities were analyzed, and an average full course vibration acceleration method was proposed for the analysis of vibration acceleration. The results show that with the same road profile, both centroid vibration acceleration and relative vibration displacement of the powertrain get enhanced with increasing the vehicle velocity, but the deflection angle of the powerstrain has no significant difference at various vehicle velocities.