考虑变工况冲击的齿轮动态啮合力分析

为研究变工况冲击对齿轮传动系统动特性影响,基于弹塑性接触理论,给出一种可以考虑变工况冲击、啮入冲击、节点冲击的齿轮接触碰撞力参数预估算法,并结合多体动力学软件建立柔性齿轮传动系统动力学模型。该模型和算法可用于大接触变形和承受频繁冲击齿轮传动系统稳态和瞬态动特性分析。研究表明:与啮入冲击导致的稳态动态啮合力相比,变工况冲击引起的瞬态动态啮合力具有幅值大、冲击时间短等特点;在不同工况下,啮入冲击会引起不同周期的齿轮动态啮合力波动;滑动摩擦系数对齿轮切向摩擦力的节点冲击影响更大。研究结果对齿轮的接触碰撞力参数预估及全面认识齿轮传动系统瞬态动特性等研究具有积极的意义。

Analysis of Gear Dynamic Meshing Force Considering Variable Condition Impact

Based on elastic-plastic contact theory, an improved algorithm is presented to calculate the parameters of the gear contact force, while considering variable conditions impact, meshing impact and pitch point impact. Meanwhile, the flexible multi-body gear transmission dynamic model is built with multi-body software and an improved algorithm. This model and algorithm can be applied to the analysis dynamics of the gear transmission with large contact deformation and frequent impact. Results show that (1) the dynamic meshing force that is caused by the variable conditions impact is greater than that caused by the meshing impact; (2) The meshing impact causes the different periodic fluctuation of the dynamic meshing force at different loading cases; (3) The sliding friction factor has great impact on the gear tangential friction pitch point impact. The results are significant for the calculation of dynamic contact force parameters and the analysis of gear transmission transient dynamics.