tailieunhanh - Industrial Robotics Theory Modelling and Control Part 2

Tham khảo tài liệu 'industrial robotics theory modelling and control part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Automatic Modeling for Modular Reconfigurable Robotic Systems - Theory and Practice 49 Figure 3. Modular robot components Joint Modules A modular robot joint module is an active joint which allows the generation of a prescribed motion between connected links. Two types of joint modules the revolute joints rotary motion and the prismatic joints linear or translational motion are considered. Rotary and linear actuators must reside in the modules to produce the required motions and maintain the modularity of the system. Multi-DOF motions can be synthesized with several 1-DOF joints. Joint modules are attached to link modules through standardized connecting interfaces for mechanical power and control connections. Link Modules The place on a link module where the joint is connected is called a connecting port. Without loss of generality we assume that a link module is capable of multiple joint connections and the link module has symmetrical geometry. Such a design allows modules to be attached in various orientations and the robot geometry to be altered by simple reassembling. The modular robot components developed in our university are shown in Figure 3. This design follows the building-block principle whereby modules can be stacked together in various orientations through connecting points on all six faces of the cubes. 50 Industrial Robotics Theory Modelling and Control Assembly Incidence Matrix Definition 1. Graph A graph Q P 8 consists of a vertex set V v0 --- vn and an edge set 8 e0 --- em such that every edge in 8 is associated with a pair of vertices . ei v j vk . a b Figure 4. a A branching modular robot b kinematic graphs of the robot In mechanism design theory a kinematic chain of links and joints is often represented by a graph termed a kinematic graph Dobrjanskyj Freudenstein 1967 in which vertices represent the links and edges represent the joints. Using this graph representation we are able to categorize the underlying structure or .

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