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1 Introduction PlanardevelopmentofacurvedsurfaceisbroadlyusedinCAGDandCAD .Accordingtotheirdevelop ment ,surfacesaredividedintodevelopablesurfacesandnon developablesurfaces .Mostofcurvedsurfacesarenon developable ,butbroadlyusedinengineering ,suchasaircraftwings ,laminaofturbine ,fluidsur face .Howeverthedesignandhandlingofcurvedsur faceareverydifficult.Inordertopredigestthecom plexityofdesign ,planardevelopingisintroduced .Non developablesurfacescannotbedevelopedontoaplanewithoutstretch… 相似文献
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To determine workspace and relationship between the workspace and geometry of parallel manipulator is important for optimum design of parallel manipulators. In this paper, the workspace and the relationship between the workspace and the geometry of 3-UPU parallel manipulators with pure translation axe investigated. Geometric and non-geometric constraints are defined and taken account of in determining the workspace of the translation 3-UPU manipulators. A direct average condition number is used as the global performance index of the workspace. This research shows that there exists an optimal value of the direct average condition number favorable for a good design of parallel mechanisms. The results presented in this paper are useful for the optimum design of 3-UPU parallel manipulators. 相似文献
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To improve the machining efficiency of large symmetrical freeform surface, this paper proposes a new machiningmethod: symmetrical machining (SM). Based on the concept of collision avoidance plane (CAP), collisions among cuttersor headstocks are avoided, and the area of machining residue is controlled effectively. Machining residue is eliminated dueto proper design of symmetrical tool in mechanism and control project. Taking 5-axis symmetrical machine with columnarheadstocks and flat cutters as example, this paper proposes collision avoidance algorithm. Finally, using a twin-skeg shipmodel surface as an example, the method is applied to avoiding collisions in original tool path. Simulation and real machiningresults show that the scheme is practical. Furthermore, the machining efficiency of SM is improved 85% more than that of thetraditional single cutter technology. 相似文献
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分层制造中任意边界簿层分形扫描路径的研究 总被引：2，自引：0，他引：2
The fractal curve is proposed as a novel scanning-path used in Layered Manufacturing.Aiming at a limitation that the fractal curve can only fill a square region,a method is developed to realize the trimming of fractal curve in arbitrary boundary layer by means of undging intersection points between parameterized arbitrary boundary and a FASS(space-filling,self-avoiding,simple and self-similar)fractal curve.Accordingly,the related algorithm concerning with determining intersection points has been investigated according to the recursion reature of the fractal curve,and in the process of the fractal curve traversed,the rule of udging intersection points is ascertained as well,so that the laser-scanning beam can “walk” along the fractal curve inside the desired boundary,and arbitrary contour components are fabricated. 相似文献
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