榫连结构接触面特性分析及轮盘的优化设计

发布时间：2018-03-29 23:38

本文选题：Hertz接触　切入点：榫连结构　出处：《东北大学》2012年硕士论文

【摘要】：压气机是一种高度复杂和精密的热力机械,其性能的好坏直接影响着飞机的飞行性能、可靠性及经济性。近年来我国航空发动机所发生的重大机械故障中,压气机中转动件的失效高达80%以上。因此,压气机的研发水平在很大程度上决定了航空技术的发展水平。压气机的榫连结构,是典型的接触形式。由于压气机叶片受到复杂的载荷作用,包括叶片本身质量所产生的离心力,气体作用产生的气动力及其振动等,使得榫头、榫槽连接的接触部分不仅产生较严重的应力集中,而且工作时构件内应力状态非常复杂,榫连结构已经成为压气机故障多发的部位之一。统计资料表明,压气机故障中有时高达20%的故障是由于榫头、榫槽结构失效造成的。因此,考虑压气机榫连结构中榫头、榫槽接触问题的计算显得至关重要,本文的主要研究内容如下： (1)利用榫连结构接触的基本理论——Hertz接触理论和库仑摩擦定律进行研究,分析Hertz接触理论和库仑摩擦定律在接触问题的实际应用条件和典型算例,并结合简化直榫头榫连结构的具体应用进行了具体计算。 (2)对不同工况下的榫连结构接触面特性进行参数影响对比分析,确定接触面稳定的网格数量；分析直、斜榫头榫连结构在不同接触变量下的接触压力、滑移距离和接触状态等接触特性；对比在实际工作状态下提取的不同三维附加载荷条件对接触特性影响。 (3)对碰摩载荷作用下的榫连结构接触面特性进行分析,分析和对比叶片与机匣间在不同侵入量和不同碰摩方式下的接触面特性。 (4)基于HyperWorks对榫连结构的轮盘进行拓扑优化分析,在给定材料和载荷等约束条件并满足强度的前提下,将轮盘的质量降到最低,满足提高推重比和发动机轻型化要求。
[Abstract]:Compressor is a kind of highly complex and precise thermal machinery. Its performance directly affects the flight performance, reliability and economy of aircraft. The failure of rotating parts in compressor is more than 80%. Therefore, the development level of compressor decides the development level of aeronautical technology to a great extent. The tenon and tenon structure of the compressor is a typical contact form. Because the compressor blade is subjected to complex loads, including centrifugal force generated by the mass of the blade itself, aerodynamic force generated by the gas action and its vibration, etc. The contact part of tenon groove joint not only produces more serious stress concentration, but also the internal stress state of the component is very complex. The tenon and tenon structure has become one of the parts with many compressor faults. Sometimes up to 20% of compressor faults are caused by tenon and tenon structure failure. Therefore, it is very important to calculate the contact problem between tenon and tenon in compressor tenon and tenon structure. The main contents of this paper are as follows:. In this paper, Hertz contact theory and Coulomb friction law are studied, and the practical application conditions and typical examples of Hertz contact theory and Coulomb friction law in contact problems are analyzed by using Hertz contact theory and Coulomb friction law. Combined with the concrete application of simplified tenon and tenon structure, the concrete calculation is carried out. (2) to compare and analyze the contact surface characteristics of tenon and tenon structure under different working conditions, to determine the stable mesh number of contact surface, to analyze the contact pressure of tenon and tenon structure with straight and oblique tenons under different contact variables, and to analyze the contact pressure of tenon and tenon joint structure under different contact variables. The contact characteristics, such as slip distance and contact state, are compared with the effects of different three-dimensional additional load conditions extracted in the actual working state on the contact characteristics. (3) the contact surface characteristics of tenon structure under rub-impact load are analyzed, and the contact surface characteristics between blade and casing under different intrusions and different rub-impact modes are analyzed and compared. 4) based on the HyperWorks topology optimization analysis of the wheel plate with tenon structure, the quality of the wheel disk is reduced to the lowest under the given constraint conditions such as material and load and the strength, which meets the requirements of improving the push-weight ratio and the light weight ratio of the engine.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH45

【参考文献】