基于LS-DYNA直齿轮动态啮合特性分析

基于接触有限元分析理论和显式计算方法，利用LS-DYNA软件，可以高保真地模拟齿轮动态啮合过程。通过建立某实验研究中齿轮的精确啮合有限元分析模型，利用上述方法，模拟实验齿轮的动态啮合过程，根据数值计算结果分析齿轮动态啮合过程的振动特性。研究表明:齿轮动态啮合过程的数值模拟结果与实验结果具有很好的一致性；薄壁齿轮易产生结构振动，且其轮缘振动明显；降低轮缘及腹板的厚度，会使得轮缘及腹板承担齿轮啮合载荷的比重增大；当腹板位置不在齿宽中心时，会导致直齿轮动态啮合过程产生轴向啮合力。此外，研究还得出齿轮的共振条件以及齿轮共振状态的判定方法。 

Dynamic meshing characteristics analysis of spur gears based on LS-DYNA

Based on contact finite element analysis theory and explicit calculation method, the dynamic meshing process of gears could been simulated with high-fidelity by using LS-DYNA software. The precise finite element analysis model of a meshed gear in one experiment is built, its dynamic meshing process in experiment is simulated by using the above methods, and the dynamic vibration characteristics of gears are obtained through studying the numerical results. The results of numerical simulation through LS-DYNA software have good consistency with experiment results. The gear with thin rim and thin web has more chances to produce structural vibrations and its rim vibration is more obvious. The gear meshing load shared by rim and web would increase when the thickness of rim and web are reduced. When the web is not located at the center of face width, the axial force will appear in spur meshing process. Besides, the conditions of gear resonance and the method for determining gear resonance state are summarized.