新型自减振行星传动系统动态特性分析

为了改善内、外部激励下机电传动系统的动态响应特性,提出一种新型自减振行星传动形式:TVD-PG(torsional vibration damper and planetary gear)传动系统,采用扭转减振装置取代传统行星齿轮中某一构件与箱体固连的方式.考虑传动轴扭转变形和行星齿轮时变啮合刚度,建立电机和适用于变速工况下的TVD-PG传动系统的耦合动力学模型.仿真分析了TVD-PG传动系统在启动和稳定工况时的动态响应特性,并与传统的行星齿轮传动方式进行对比.结果表明:在启动阶段,TVD-PG传动系统可快速减小电机电磁转矩波动,使电机和输出端转速快速平稳上升,同时改善了启动和稳定工况下行星齿轮系统的动态啮合力状况.由于机电耦合作用,在系统稳定时可清晰观察到齿轮系统内部激励参数对电机部分的影响.

Dynamic characteristics of a new self-damping planetary transmission system

To improve the dynamic characteristics of the electromechanical transmission system under internal and external excitation, this paper proposes a new self-damping planetary transmission form, a torsional vibration damper coupled with a planetary gear (TVD-PG), in which the torsional vibration damper is used to replace the conventional structure of a certain member in the planetary gear being fixed with a box. A dynamic model of a motor and the TVD-PG system for variable speed is established, with the torsional deformation of shaft and the time-varying meshing stiffness of planetary gear taken into consideration. The dynamic characteristics of the TVD-PG system under startup and stable conditions are obtained and compared with those of traditional planetary gear transmission. The results show that the TVD-PG system can quickly reduce the fluctuation of the motor electromagnetic torque during the startup process, so that the speeds of the motor and the output can rapidly and smoothly increase. At the same time, the status of the dynamic meshing force in the planetary gear is improved under startup and stable conditions. Furthermore, because of the electromechanical coupling, the influence of the internal excitation parameters of the gear system on the motor part can be clearly observed when the system is stable.