【摘要】 本文中研究了具有分段线刚度的双质量飞轮在扭转振动过程中的非线性振动特性。首先建立双质量飞轮分段线性系统的数学模型,利用平均法得到系统响应在周期激励下的一次近似解,以及系统幅频特性函数;然后以实际双质量飞轮参数为例,分析各参数对幅频特性的影响;最后利用AMEsim软件对单级刚度和两级刚度双质量飞轮在不同工况下的减振性能进行对比分析。结果表明,平均法适用于双质量飞轮的非线性振动分析,同时系统幅频特性曲线在分段处具有向高频拐弯的特性,非线性特性可以降低系统共振峰值,仿真结果也表明两级刚度双质量飞轮在点火、熄火工况下第二质量转速波动和角加速度值要比单级刚度小。更多还原

【Abstract】 The nonlinear vibration characteristics of the dual mass flywheel with piecewise linear stiffness during torsional vibration are studied in this paper. Firstly, the mathematical model of the dual-mass flywheel piecewise linear system is established. The average method is used to obtain an approximate solution of the system response and the amplitude-frequency characteristic function under the periodic excitation. Then for the actual dual mass flywheel, the influence of each parameter on the amplitude-frequency characteristics is analyzed. Finally, the damping performances of single-stage stiffness and two-stage stiffness dual-mass flywheel under different working conditions are compared and analyzed. The results show that the average method is applicable to the nonlinear vibration analysis of the dual-mass flywheel and the system amplitude-frequency characteristic curve has the characteristics of turning to high frequency at the segment. Nonlinear characteristics can reduce the resonance peak of the system. The simulation results also show that the two-stage stiffness dual-mass flywheel has smaller second mass speed fluctuation and angular acceleration than the single-stage stiffness flywheel under ignition and flameout conditions.更多还原