斜撑式超越离合器楔合过程接触分析及动态测试

发布时间：2018-03-13 04:30

本文选题：斜撑式超越离合器　切入点：楔合过程　出处：《哈尔滨工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：斜撑式超越离合器是直升机传动系统的关键部件,其优良程度对飞机的性能及可靠性有着至关重要的影响。随着航空飞行器不断朝高速重载的方向发展,对超越离合器的强度以及动态性能的要求也越来越高。而国内在这两方面的研究内容开展较少。本文选取斜撑式超越离合器为研究对象,以其楔合过程的接触分析和动态测试为主要研究内容开展研究。首先基于经典楔块接触角计算公式及赫兹接触相关理论模型,通过Matlab编程迭代计算其静态接触力及接触应力,对离合器进行强度校核;基于ANSYS Workbench建立斜撑式离合器的几何模型及有限元模型,开展静态接触的有限元分析。并对迭代计算结果与有限元仿真结果的进行对比,开展有限元仿真方法的收敛性分析,探讨研究圆弧数对仿真结果的影响。然后基于LS-DYNA对斜撑式离合器进行动态接触分析。建立斜撑式离合器几何模型及有限元模型,通过计算和分析楔合过程中输出轴速度变化、楔块与内外环接触力变化以及楔块与内外环之间最大接触力的分布状况,探讨研究摩擦系数和带状弹簧刚度对离合器动态接触特性的影响。再根据接触分析结果,提出离合器动态测试试验原理,对试验台机械系统、信号采集与控制系统进行方案设计,并完成试验台加工、装配与调试,解决机械结构设计及装配难点,解决机械系统集中稀油润滑及密封问题,确保试验台的同轴度及水平度。最后开展离合器动态性能试验,测试离合器阻力矩及输出轴的楔合速度曲线,以验证动态接触分析结果,获取离合器动态性能参数。
[Abstract]:Oblique brace overrunning clutch is the key component of helicopter transmission system, and its excellent degree has a vital influence on the performance and reliability of aircraft. The demands on the strength and dynamic performance of overrunning clutch are more and more high, but the research contents of these two aspects are less in China. In this paper, the oblique brace overrunning clutch is chosen as the research object. In this paper, the contact analysis and dynamic measurement of the wedge process are taken as the main research contents. Firstly, based on the classical wedge contact angle formula and Hertz contact theory model, the static contact force and contact stress are calculated iteratively by Matlab programming. Based on ANSYS Workbench, the geometric model and finite element model of oblique brace clutch are established, and the static contact finite element analysis is carried out. The iterative calculation results are compared with the finite element simulation results. The convergence analysis of finite element simulation method is carried out to study the influence of arc number on the simulation results. Then the dynamic contact analysis of skew braced clutch based on LS-DYNA is carried out. The geometric model and finite element model of skew braced clutch are established. Through the calculation and analysis of the velocity change of the output shaft, the contact force between the wedge and the inner and outer ring and the distribution of the maximum contact force between the wedge and the inner and outer ring, The effects of friction coefficient and strip spring stiffness on the dynamic contact characteristics of clutch are studied. Based on the results of contact analysis, the principle of clutch dynamic test is put forward. The signal acquisition and control system is designed, and the test bed is processed, assembled and debugged, the difficulties of mechanical structure design and assembly are solved, and the problems of concentrated thin oil lubrication and sealing of mechanical system are solved. Finally, the clutch dynamic performance test was carried out to test the clutch resistance moment and the wedge velocity curve of the output shaft to verify the dynamic contact analysis results and obtain the clutch dynamic performance parameters.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：V229;V275.1

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