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Hauth S.,Jacobs University Bremen | Richterich C.,ModuleWorks GmbH | Glasmacher L.,Fraunhofer Institute For Produktionstechnologie | Linsen L.,Jacobs University Bremen
International Journal of Advanced Manufacturing Technology | Year: 2011

Constant cusp is a common strategy for generating tool paths in many NC machining applications. Cusps need to be regulated to ensure high precision without wasting machining efforts. Constant cusp strategies frequently operate on NURBS surfaces or triangular meshes and, thus, have to deal with the issues of patch-boundary oscillations or long, stretched triangles. To avoid these issues, one can operate in a pre computed configuration space (c-space). The c-space is given in form of a regular quadrilateral heightfield mesh, which may be adaptively subdivided, where the slope is large. This simple data structure is memory efficient and is widely used in CAD/CAM frameworks. In this paper we introduce an algorithm for creating a constant cusp tool path with the help of a given c-space. The constant cusp algorithm iteratively produces curves in the c-space by fitting a tube around the current curve and intersecting the tube with the c-space mesh to detect the subsequent curve. As tool paths are handed to the machine controller in form of point sequences, it suffices to operate on piecewise linear curves. The tube becomes a concatenation of cylinders, which we derive using geometric considerations. In each iteration of the constant cusp algorithm, intersection points of the cylinders with the not yet traversed part of the mesh are detected and checked for their validity. The validity check can efficiently remove global or local self-intersections of the new curve by just deleting the respective points. In a final step, the detected intersection points are connected to form constant cusp tool paths. Dealing with piecewise linear curves, we achieve low computation times for real-world data sets.

Berger R.,University of Stuttgart | Fleischle D.,University of Stuttgart | Korner K.,University of Stuttgart | Lyda W.,University of Stuttgart | And 4 more authors.
Technisches Messen | Year: 2011

Summary With diamond tools it is possible to achieve high surface qualities with one process step. To produce complex mouldings with a reduced amount of chipping runs new tools with free-form cutting edges will be used. However, this requires a high accuracy of the diamond tools which must be tested consequently and very precisely in real process time. The concept of the used measurement technique for the free-form diamond tools and the simulated results of a set-actual comparison of a cutting edge are presented. © Oldenbourg Wissenschaftsverlag.

Kruger M.,Fraunhofer Institute For Produktionstechnologie | Trachtler A.,University of Paderborn
At-Automatisierungstechnik | Year: 2015

Parametric model-order reduction for the reduction of Pareto optimal systems is presented in this paper. The developed method can be used to simplify complex models which describe the dynamical behavior of selfoptimizing systems. The close interrelation of parametric model-order reduction with both hierarchical optimization as well as hierarchical modelling of mechatronic systems is an outstanding feature of the proposed method. A brief overview of the approach is given and a test rig of an active suspension system serves as an application example.

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