冗余结构圆柱凸轮机构的研究

发布时间：2018-06-27 07:34

本文选题：圆柱凸轮机构 + 冗余结构　；参考：《陕西科技大学》2017年硕士论文

【摘要】：圆柱凸轮机构是自动机械中常见的传动机构。它可以实现从动部件任意运动规律,并且加工相对容易,成本较低。机构在运动过程中,特别是机构加速度发生换向时,会发生常见的横越冲击现象,影响机构的传动稳定性,因此现有圆柱凸轮机构在动力特性方面存在缺陷和不足。本课题提出了改善机构此方面特性的两种含有冗余结构的圆柱凸轮机构,分别是大小滚子圆柱凸轮机构和双层滚子圆柱凸轮机构。本文内容主要有以下几个方面:(1)在广泛阅读文献的基础上,对国内外圆柱凸轮机构的现状进行了总结。介绍了课题的主要研究内容,分析了现阶段圆柱凸轮机构在实际应用中的优缺点。为改善现有圆柱凸轮机构运动特性,典型性的提出了大小滚子圆柱凸轮机构和双层滚子圆柱凸轮机构。同时,论文给出了本课题的主要创新点和研究方法。(2)论文对圆柱凸轮机构的一些基础理论,主要是机构的运动规律、机构的运动参数、机构的主要尺寸、机构的廓面方程等方面作了梳理总结。在原有圆柱凸轮机构的基础上,提出了圆柱凸轮机构冗余结构的概念。分别针对含有冗余结构的大小滚子圆柱凸轮机构和双层滚子圆柱凸轮机构进行了分析与说明。(3)在弹性变形假设的条件下,对大小滚子圆柱凸轮机构和双层滚子圆柱凸轮机构冗余结构部分进行了相关弹性变形计算。大小滚子圆柱凸轮机构通过考虑在不同条件下小滚子销轴弹性变形,计算出其所能承受最大载荷值,给出了相关参数的结论数据表;双层滚子圆柱凸轮机构考虑在凸轮廓面和滚子接触弹性变形条件下,给出了滚子的选择依据参数表及滚子发生弹性变形的形变量数值表。(4)依据等距曲面原理和圆柱凸轮机构廓面方程,采用三维设计软件Pro/E完成了大小滚子凸轮机构和双层滚子凸轮机构的三维建模。关键是依据不同的冗余结构要求完成大小滚子凸轮和双层滚子凸轮本体的建模,同时分别设计相对应分读盘的三维模型。(5)采用软件ADAMS仿真完成了普通圆柱凸轮机构以及含冗余结构圆柱凸轮机构的运动学和动力学仿真。将后者仿真得到的分度盘后处理结果与前者相比较,验证冗余机构的有效性。同时将冗余机构仿真结果与理论计算出的结果进行比较。最后针对大小滚子圆柱凸轮机构作了刚柔耦合动力学仿真分析。
[Abstract]:Cylindrical cam mechanism is a common transmission mechanism in automatic machinery. It can realize any movement rule of follower, and it is relatively easy to process and low cost. In the process of motion, especially when the acceleration of the mechanism changes direction, the common phenomenon of cross impact will occur, which will affect the transmission stability of the mechanism. Therefore, the existing cylindrical cam mechanism has some defects and deficiencies in the dynamic characteristics of the mechanism. In this paper, two kinds of cylindrical cam mechanisms with redundant structure are proposed to improve the characteristics of the mechanism. They are the size roller cylindrical cam mechanism and the double-layer roller cylindrical cam mechanism. The main contents of this paper are as follows: (1) based on the extensive reading of literature, the present situation of cylindrical cam mechanism at home and abroad is summarized. The main research contents of this paper are introduced, and the advantages and disadvantages of cylindrical cam mechanism in practical application are analyzed. In order to improve the kinematic characteristics of the existing cylindrical cam mechanism, the size roller cylindrical cam mechanism and the double roller cylindrical cam mechanism are proposed. At the same time, the main innovation points and research methods of this thesis are given. (2) some basic theories of cylindrical cam mechanism are presented in this paper, including the motion law of the mechanism, the motion parameters of the mechanism, the main dimensions of the mechanism, and so on. The outline equation of the mechanism is summarized. Based on the original cylindrical cam mechanism, the concept of redundant structure of cylindrical cam mechanism is proposed. The size roller cylindrical cam mechanism with redundant structure and the double roller cylindrical cam mechanism are analyzed and explained respectively. (3) under the assumption of elastic deformation, The relative elastic deformation of the redundant structure of the large and small roller cylindrical cam mechanism and the double roller cylindrical cam mechanism is calculated. By considering the elastic deformation of small roller pin shaft under different conditions, the size roller cylindrical cam mechanism calculates the maximum load value it can bear, and gives the conclusion data table of relevant parameters. The double roller cylindrical cam mechanism is considered under the condition of the contact elastic deformation of the cam profile and the roller. The selection of roller is based on the parameter table and the form variable numerical table of the roller elastic deformation. (4) according to the principle of equidistant surface and the profile equation of cylindrical cam mechanism, The 3D modeling of the large and small roller cam mechanism and the double roller cam mechanism is completed by using the three dimensional design software Prop / E. The key is to complete the modeling of the size roller cam and the double roller cam body according to the different redundant structure requirements. At the same time, the corresponding three-dimensional models of the read disk are designed. (5) the kinematics and dynamics simulation of the ordinary cylindrical cam mechanism and the cylindrical cam mechanism with redundant structure are completed by using the software Adams. The post-processing results obtained from the latter simulation are compared with the former to verify the effectiveness of the redundant mechanism. At the same time, the simulation results of redundant mechanism are compared with the calculated results. Finally, the rigid-flexible coupling dynamics simulation analysis is made for the cylindrical cam mechanism with large and small rollers.
【学位授予单位】：陕西科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH112.2

【参考文献】