Computer-aided Analysis And Simulation Of Planar Linkage

The planar linkage mechanism is used widely. Designing and anglicizing of it is an important subject of the theory of machines and mechanisms. But the traditional method analyses about kinematics, dynamics of the planar linkage mechanism was so tedious that it was very difficult to carry on deeper research to it. If a simulation systems of the planar linkage mechanism was set up, which make the designers broken away from the complicated analyze and the convoluted calculation of the organization, and focus their minds on innovation, it will be very meaningful. Based on this consideration, this subject was tried to set up a kinematical simulation system of the planar linkage mechanism.This dissertation spoker of the basic composition of mechanism at first, researched into the condition on which kinematical chain becomes mechanism and the calculation formula of freedom in mechanism, and pointed out the constituent principle that any mechanism can be regarded as several basic linkage groups connected on original moveable piece and framework in turn; Then explained the basic knowledge of graph theory and how the graph is expressed in computer, told the one - to - one relationship between the structure sketch of mechanism and its topological graph, in which nodes represent components and edges take kinematical constraint; On this basis , it emphasized how to establish the node basic information database and the restricting relation database, and constructed out the mathematic model of the planar linkage mechanism. According to the basic constituent principle of the planar mechanism and through analyzing the mathematic model, the organizational constitutions were isolated and solved, and the kinematics expert system of the planar linkage mechanism was built. Now the system can complete the kinematics analysis and dynamic display of some planar linkage mechanisms.The last part of the dissertation was the realization of the system, including demonstrating the function of the system and the way to use it, and checked the artificial result by analyzing some planar linkage mechanisms.