摘要
采用简化的活塞曲柄连杆机构,以实测时变缸压为激励,同时考虑了曲柄连杆机构时变转动惯量、离合器非线性刚度、齿轮侧隙和齿轮啮合时变刚度等因素,建立了乘用车动力传动系3挡集中参数扭振模型,计算分析了传动系固有振动特性。进行3挡全油门加速工况下的试验和仿真,对比其飞轮、输入轴和输出轴的2阶主谐次扭振加速度信号,验证了模型的有效性。分析系统的扭振响应发现在2 500~2 700r/min之间系统发生共振现象,输入轴的最大扭振加速度值为1 650rad/s2。在模型中换用双质量飞轮后的试验和仿真都表明,在整个加速区间内避免了扭转共振现象,输入轴的最大扭振加速度值大幅度减小至313.6rad/s2。
By adopting simplified piston-crank-connecting rod mechanism with measured time-varying cylinder pressures as excitation and considering several factors including the time-varying moment of inertia of crank-connecting rod mechanism,the nonlinear stiffness of clutch,backlash and time-varying meshing stiffness of gear pairs,a third-gear lumped parameter torsional vibration model of car power-train is built,with the natural vibration characteristics of powertrain calculated and analyzed. Both simulation and test are conducted on the condition of third-gear full-throttle acceleration to compare the 2 nd-order torsional vibration acceleration signals of flywheel,input shaft and output shaft,with the effectiveness of the model built validated. The analysis on the torsional vibration response of system shows that resonance happens in the speed interval of 2 500 ~ 2 700 r/min with a peak torsional vibration acceleration of input shaft reaching 1 650 rad/s2. The results of simulation and test on the model with dual mass flywheel indicate that torsional resonance is avoided in the whole range of acceleration interval with a peak torsional vibration acceleration of input shaft significantly reduces to 313 rad/s2.
出处
《汽车工程》
EI
CSCD
北大核心
2018年第1期91-97,113,共8页
Automotive Engineering
关键词
动力传动系
扭振
非线性
双质量飞轮
power train
torsional vibration
nonlinearity
dual mass flywheel
