Entirety transformation mechanism and topological-type synthesis for heavy-duty gripping devices

Force closure and stability problems exist in heavy gripping devices. Based on a typical gripping device for forging operations, the workpiece and the gripping device are innovatively considered as a single mechanism in this paper, and its global topological configuration is obtained. The changing element method is used to establish the optimized topology geometry of the gripping device by decreasing the degrees of freedom of the gripping mechanism and improving the force closure performance. Therefore, a new idea for the innovative design of heavy-duty forging gripping devices is provided. As the effect of revolute joint friction on loading capacity of the gripping device cannot be ignored, a unified mechanical equation including friction in terms of the topological adjacency matrix is established to analyze the force closure performance and calculate the loading capacity. The conclusions are provided by experiments.

     

基于Google Earth Plugin的校园三维网页发布——以西南林业大学为例

数字校园和Google Earth数字地球平台相结合已成为了实现数字校园的途径之一。以西南林业大学为例,采用Google SketchUp对校园建筑进行三维建模;然后基于本地服务器与Google Earth服务,利用Google Earth Plugin以网页形式在地球平台上发布学校三维全景,并提供浏览、定位查询等功能...