平行分度凸轮机构的动力学研究

发布时间：2018-12-08 20:19

【摘要】：围绕动力学建模、动力学仿真、运动规律等关键技术问题对平行分度凸轮机构的动力学展开研究。为设计动态性能卓越的平行分度凸轮机构提供了理论依据。对平行分度凸轮机构进行了运动学分析,得出结论:变余弦传动函数和盖特曼传动函数对应的输出角位移和角速度的变化规律相似,角加速度的变化规律存在本质区别。变余弦传动函数对应的输出运动角加速度在分度开始和分度结束时存在突变;盖特曼传动函数对应的输出运动角加速度是连续的。对分度凸轮机构的传动函数进行了研究,提出了“自下而上”的传动函数构造思想,并给出了函数构造实例,以加速度连续、跃度连续为目标构造了传动函数。在分析平行分度凸轮机构特点的基础上,提出了基于多体系统动力学的动力学建模方法。利用ADAMS、Pro/E、ANSYS三种平台联合建立了平行分度凸轮机构的刚柔耦合的动力学模型。以动力学建模为基础进行了仿真分析,通过模型测试验证了动力学建模的正确性,提出了基于虚拟样机技术的传动函数验证方法。分析了影响机构动力学性能的主要因素,以加速度响应、扭转振动为分析目标,研究了输入转速、负载惯量、动程角等参数对平行分度凸轮机构动力学性能的影响规律。针对不同传动函数对应的凸轮机构进行了动力学仿真和分析,提出了基于机构动态性能的传动函数选用原则:变余弦传动函数只适合于低速和对传动精度要求不高的场合;盖特曼传动函数适用范围比Y 余弦传动函数广，，可用于从低速到较高速度以及传动精度要求较高的场合;复合传动函数是高速时动力学特性最好的传动函数,适用于高速分度凸轮机构。
[Abstract]:The dynamics of parallel indexing cam mechanism is studied around the key technical problems such as dynamics modeling, dynamics simulation and motion law. It provides a theoretical basis for the design of parallel indexing cam mechanism with excellent dynamic performance. The kinematics analysis of parallel indexing cam mechanism is carried out. It is concluded that the variation law of output angular displacement and angular velocity corresponding to variable cosine transmission function and Gettmann transmission function is similar, and the variation law of angular acceleration is essentially different. The angular acceleration of the output motion corresponding to the variable cosine transmission function is abrupt at the beginning of the indexing and the end of the indexing, and the angular acceleration of the output motion corresponding to the Gettmann transmission function is continuous. In this paper, the transmission function of indexing cam mechanism is studied, the idea of constructing transmission function from bottom to top is put forward, and an example of function construction is given. The transmission function is constructed with the aim of continuous acceleration and continuous jump. On the basis of analyzing the characteristics of parallel indexing cam mechanism, a dynamic modeling method based on multi-body system dynamics is proposed. The dynamic model of rigid-flexible coupling of parallel indexing cam mechanism is established by using three platforms of ADAMS,Pro/E,ANSYS. Based on the dynamic modeling, the simulation analysis is carried out, and the correctness of the dynamic modeling is verified by the model test. A driving function verification method based on virtual prototyping technology is proposed. The main factors that affect the dynamic performance of the mechanism are analyzed. With the acceleration response and torsional vibration as the analysis targets, the influence of the parameters such as the input speed, the inertia of the load and the angle of motion on the dynamic performance of the parallel indexing cam mechanism is studied. The dynamic simulation and analysis of cam mechanism corresponding to different transmission functions are carried out, and the principle of selecting transmission function based on the mechanism's dynamic performance is put forward: the variable cosine transmission function is only suitable for low speed and low transmission precision; The application range of Gatman transmission function is wider than that of Y cosine transmission function, and it can be used in the situation from low speed to higher speed and high transmission precision. Compound transmission function is the best dynamic function in high speed, and it is suitable for high speed indexing cam mechanism.
【学位授予单位】：济南大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH112.2

【引证文献】