混合驅動平面3-RRR機構的基礎研究
[Abstract]:With the rapid development of high and new technology, higher requirements have been put forward for modern machinery, such as having output flexibility, being able to realize multi-function of one machine, and meeting the increasingly diverse functional requirements and so on. The traditional mechanism is lack of flexibility and can only accomplish a single task. Although the fully servo-driven robot mechanism has good flexibility, it also has the disadvantages of high cost and poor load-carrying capacity. The hybrid drive mechanism has become one of the research hotspots in mechanism science because of synthesizing the advantages of both. The hybrid drive mechanism is a kind of mechanism which uses the input of constant speed motor and servo motor as the power source through the synthesis mechanism of multiple degrees of freedom. Among them, the constant speed motor provides the main power, the servo motor plays the motion regulation function. According to the current research situation at home and abroad, the research on hybrid drive mechanism is mainly focused on the planar two-degree-of-freedom five-bar and seven-bar mechanisms, but not on the three-degree-of-freedom and more mechanisms. The main contents of this paper are as follows: (1) the planar three-degree-of-freedom mechanism is synthesized by connecting rod, and selected one by one according to the requirements of the hybrid drive mode. Finally, the planar 3-RRR mechanism is chosen as the research object. (2) the basic kinematics analysis of planar 3-RRR mechanism, including position-forward solution, position-attitude inverse solution, Jacobian matrix solution, workspace analysis, etc., lays the foundation for further research. (3) summarize the constraint conditions which must be satisfied in the design of the rod length of the hybrid drive plane 3-RRR mechanism. By using the assemblage condition of planar single-loop linkage mechanism, the existence conditions of crank of planar 3-RRR mechanism are analyzed, and the geometric conditions to avoid forward singularity are given by analyzing the specific singular configuration. Finally, the conclusion is verified by a set of simulation examples. (4) trajectory planning of hybrid driven planar 3-RRR mechanism is studied. Based on the conclusion of inverse kinematics analysis, the point locus planning is carried out by using cubic spline function, and the rotation law of servo motor is designed, and the influence of different speed of constant speed motor on the planning result is compared. Since the three degrees of freedom are the transition between plane and space, the study of this paper hopes to provide some reference value for the future study of hybrid drive space mechanism.
【學位授予單位】:中北大學
【學位級別】:碩士
【學位授予年份】:2011
【分類號】:TH112
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