单级齿轮系统拍击特性研究

用数值仿真法和映射法研究了齿轮系统的拍击振动特性。通过研究每一次碰撞之间的映射关系、每一拍击周期之间的映射关系,得出的结论是:激励幅值的大小是影响系统拍击性能的一个重要因素;当激励幅值增大时,齿轮碰撞速度也增大,在一定条件下,将发生齿背碰撞;当激励幅值变化时,齿轮系统的初始脱齿状态也将发生变化,由此导致系统产生1周期、2周期、多周期甚至准周期拍击振动;转速波动的二次谐波分量对系统拍击性能的影响与基频分量的影响基本相同,因此,忽略二次谐波将导致较大的误差。用周期性拍击过程之间的映射关系研究齿轮系统的拍击特性,会带来很大的方便。

RESEARCH ON RATTLING DYNAMICS OF ONE-STAGE GEAR SYSTEM

In order to investigate the rattling characteristics of a gear system, the numerical simulation and mapping method are used. According to the mapping relationship between the every impact, or between the periodic rattling process, it is concludes that the exciting amplitude is an important factor, which affects the rattling characteristics. When the exciting amplitude is increased, the impacting velocity is also increased, and in certain condition, backside impact takes place. When the exciting amplitude is changed, the initial disengagement state is also changed, therefore, one, double, multiple periodic rattling, even quasi-periodic rattling characteristics appear in a gear system. The second harmonic of the speed fluctuation affects the rattling characteristics as same as the first harmonic, therefore, neglecting the second harmonic can lead to more error. It is convenient to investigate the rattling characteristics by means of the mapping relationship between the periodic rattling process.