Torsional Vibration Analysis and Influencing Factors of Power Split Hybrid Transmission System
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摘要: 针对某款混合动力汽车,综合考虑发动机、电机、复合行星齿轮机构、离合器、减速器、差速器和半轴等部件,采用集中质量法建立功率分流传动系统动力学模型。在此基础上,分析不同运行工况下传动系统固有频率和振型,分别研究电机和发动机激振频率与传动系统固有频率之间的关系,仿真分析扭转减振器刚度对传动系统固有频率的影响规律,通过改变扭转减振器刚度从而使得传动系统共振转速远离发动机常用工作区。Abstract: For a hybrid electric vehicle, considering the engine, motor, composite planetary gear mechanism, clutch, reducer, differential and half shaft, the dynamic model of power split transmission system is established with the centralized mass method. On this basis, the natural frequency and vibration mode of the transmission system under different operating conditions are analyzed, the relationship between the excitation frequency of motor, engine and the natural frequency of the transmission system is studied respectively, and the influence law of torsional damper stiffness on the natural frequency of the transmission system is simulated and analyzed. Finally, by changing the stiffness of the torsional shock absorber, the resonant speed of the transmission system is adjusted far away from the common working area of the engine.
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表 1 齿轮副啮合刚度
Table 1. Gear pair meshing stiffness
齿轮副 啮合刚度108/(N·m−1) 小太阳轮−短行星齿轮 2.21 小太阳轮−短行星齿轮 3.36 短行星齿轮−长行星齿轮 3.64 短行星齿轮−内齿圈 3.67 外齿圈−减速器 4.33 减速器−差速器 8.75 表 2 传动系统各部件参数
Table 2. Parameters of various components of the transmission system
参数名称 数值 飞轮等效转动惯量/(kg·m2) 0.28 行星架转动惯量/(kg·m2) 0.0041 小太阳轮电机E1等效转动惯量/(kg·m2) 0.029 大太阳轮电机E2等效转动惯量/(kg·m2) 0.039 齿圈等效转动惯量/(kg·m2) 0.0056 减速器等效转动惯量/(kg·m2) 0.0062 差速器等效转动惯量/(kg·m2) 0.021 驱动轮转动惯量/(kg·m2) 1.82 整车质量/kg 1300 车轮半径/m 0.32 扭转减振器刚度/(Nm·rad−1) 610 行星架轴刚度/(Nm·rad−1) 500 左半轴扭转刚度/(Nm·rad−1) 4312 右半轴扭转刚度/(Nm·rad−1) 5434 车轮扭转刚度/(Nm·rad−1) 4500 表 3 电动工况传动系统固有频率
Table 3. Natural frequency of electric working condition transmission system
阶数 频率/Hz 1 6.23 2 69.01 3 506.93 4 2322.18 5 2322.18 6 4020.73 7 4427.19 8 4427.19 表 4 混动中低速工况传动系统固有频率
Table 4. Natural frequency of hybrid medium and low speed transmission system
阶数 频率/Hz 1 6.39 2 31.42 3 69.01 4 737.92 5 2535.37 6 2535.37 7 3313.78 8 4399.44 表 5 电动工况传动系统固有频率
Table 5. Natural frequency of electric working condition transmission system
阶数 频率/Hz 1 6.38 2 31.41 3 69.01 4 736.46 5 2346.53 6 2346.53 7 3554.4 8 4436.58 -
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