基于接触动力学的螺旋锥齿轮动态啮合性能有限元分析研究

【作者】 彭方进；

【导师】 唐进元；

【作者基本信息】 中南大学 ， 机械设计及理论， 2010， 硕士

【摘要】 螺旋锥齿轮作为机械装备中的动力与运动传递装置的关键零部件,广泛应用于汽车、航空、船舶等行业中,并朝着高速、重载的方向发展。螺旋锥齿轮的啮合接触冲击特性和动态接触性能的好坏严重影响其整机的工作性能。本文从螺旋锥齿轮的啮合原理、动力学基本理论以及实际工况等几个方面对螺旋锥齿轮动态啮合性能分析研究的必要性进行了讨论。螺旋锥齿轮动态啮合问题是一个边界条件高度非线性的接触动力学问题。本文根据接触动力学、显式非线性有限元的基本理论和方法,提出了考虑惯性载荷的螺旋锥齿轮动态啮合分析有限元模型,并对有限元网格模型进行了优化,为客观、准确地分析螺旋锥齿轮的动态啮合性能提供了必要的准备。研究表明,惯性载荷对螺旋锥齿轮动态啮合性能有显著影响。基于合理的有限元模型,对螺旋锥齿轮的啮合接触冲击特性和动态接触性能进行了深入研究。得到了螺旋锥齿轮动态啮合过程的啮合接触冲击曲线,以及齿面接触力、齿面接触应力、齿根弯曲应力和轮齿接触区等动态接触特性的变化规律。以转速和负载两个典型的工作条件因素为例,建立对比分析模型,研究转速和负载对螺旋锥齿轮动态啮合性能的影响。转速对螺旋锥齿轮动态啮合性能影响显著,而负载对螺旋锥齿轮的动态啮合性能影响则跟转速有关。研究文献表明,轴的变形对于螺旋锥齿轮强度有着明显的影响。意外的轴变形将造成严重的边缘载荷,将减少齿轮寿命,并产生噪音。因此,本文还研究了动态啮合过程中轴变形的变化规律,及其对螺旋锥齿轮动态啮合性能的影响。更多还原

【Abstract】 Spiral bevel gears have application in lots of types of equipment as one of the most important mechanical transmission elements in many industrial fields such as motor-vehicle, aviation and ship craft. The current trend is towards high-speed and heavy-load. The meshing contact-impact and contact performance of spiral bevel gears has a strong impact on the whole machine performance. The necessity of studying the dynamic property of spiral bevel gears was discussed via analyzing the mesh theory, the basic contact dynamics and the actual work condition.The process of spiral bevel gears’dynamic meshing is some problem with respect to contact dynamics of highly nonlinear boundary. Based on the theory of contact dynamics and finite element method, a finite element model, in which the influence of inertial load was concerned and the meshes was optimized, was introduced for the objective and accurate dynamic meshing analysis of spiral bevel gears. The result shows that the inertial load affects the dynamic meshing characteristics a lot.Based on the reasonable model, the characteristics of the spiral bevel gears in dynamic meshing were studied. Obtained the laws of meshing contact-impact, the contact force, the contact stress, the tooth root bending stress and the contact area in the dynamic meshing of spiral bevel gears. The contrast research shows that the rotate speed has an obvious influence up on the characteristics of the spiral bevel gear in dynamic meshing, and that the load affects it little. Take the example of the two typical work factors like speed and load. The influences of speed and load on the dynamic meshing characteristics were discussed. The contrast research shows that the rotational speed has an obvious influence up on the characteristics of the spiral bevel gear in dynamic meshing, and that the influence of load is related to the rotational speed.The marketing literature address that axle deflections have a significant impact on gear tooth strength. Unexpected deflections can cause severe edge loading that is detrimental to gear surface life as well as noise performance. Therefore, the variability of axle deflections and their effects on the dynamic performance in the dynamic meshing of spiral bevel gears was studied.更多还原