摆动液压缸虚拟样机技术实现及系列化设计

发布时间：2018-06-19 20:56

本文选题：摆动液压缸 + 虚拟样机技术　；参考：《中南大学》2011年硕士论文

【摘要】：摆动液压缸是一种通过螺旋传动把直线运动转变成旋转运动并因此做功的液压元件,其结构简单,传动效率高,能够在较小的结构尺寸下输出大扭矩,适用于大扭矩、短力臂的工况。本文对摆动液压缸进行了数字化设计、动力学仿真及关键零部件的有限元分析,研究了满足不同结构要求、输出要求的摆动液压缸的虚拟样机技术的实现问题。主要包括以下几个方面的工作：进行了零部件的参数化建模和虚拟装配,建立了含两级渐开线螺旋副的摆动液压缸数字样机。利用该数字样机进行了多体动力学仿真分析,分析结果表明：系统液压力与输出扭矩成正比关系；在30°-60°的螺旋角区间,45°附近的渐开线螺旋副传递效率最高。对摆动液压缸的关键零部件进行了受力分析,对其两级渐开线螺旋副进行了有限元分析。运用NXNastran,建立了两级渐开线螺旋副在两种极限工况下的静力分析有限元模型,分析得到了各零件在极限工况下的最大应力、应变,进行了零件的刚度、强度校核；分别建立了两级螺旋副的内外齿轮接触对的非线性面-面接触有限元模型,分析了接触面的应力分布,结果表明齿面应力和齿根应力分布较均匀。对摆动液压缸输出端旋转角度进行了系列化设计,设计了输出端旋转角度为90°、180°、270°、360°的系列；选取R5优先数列,对输出扭矩进行了系列化设计。对系列内的摆动液压缸可进行零部件的虚拟装配、两级螺旋副的动力学仿真、关键零部件的有限元分析。应用摆动液压缸实验测试平台,进行了低转速输出扭矩与输入压力的关系实验,验证了仿真结果的正确性。
[Abstract]:Swing hydraulic cylinder is a kind of hydraulic element which transforms straight line motion into rotational motion and thus works through spiral drive. Its structure is simple, its transmission efficiency is high, and it can output large torque in smaller structure size, which is suitable for large torque. The working condition of short arm. In this paper, the digital design, dynamics simulation and finite element analysis of the key parts of the oscillating hydraulic cylinder are carried out, and the realization of the virtual prototyping technology of the swinging hydraulic cylinder which meets the requirements of different structure and output is studied. The main work includes the following aspects: parametric modeling and virtual assembly of parts and components are carried out, and a digital prototype of oscillating hydraulic cylinder with two-stage involute screw pair is established. The simulation results show that the hydraulic pressure of the system is proportional to the output torque, and the transmission efficiency of the involute helical pair is the highest in the range of 30 掳-60 掳. The force of the key parts of the oscillating hydraulic cylinder is analyzed, and the finite element analysis of the two-stage involute helical pair is carried out. The static finite element model of the two-stage involute helical pair under two limit conditions is established by using NXNaSS. The maximum stress and strain of each part under the limit condition are obtained, and the stiffness and strength of the parts are checked. The nonlinear plane-plane contact finite element model of the internal and external gear contact pair of the two-stage spiral pair is established, and the stress distribution of the contact surface is analyzed. The results show that the distribution of tooth surface stress and tooth root stress is more uniform. The rotary angle of the output end of the oscillating hydraulic cylinder is serialized, and the series of the rotary angle of the output end is designed, which is 90 掳/ 180 掳/ 270 掳/ 360 掳, and the output torque is serialized by selecting the R5 priority series. Virtual assembly of components, dynamic simulation of two-stage screw pairs and finite element analysis of key parts can be carried out for the oscillating hydraulic cylinders in the series. The relationship between output torque of low speed and input pressure is tested on the experimental platform of oscillating hydraulic cylinder, and the correctness of the simulation results is verified.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH137.51

【引证文献】