Universität Stuttgart
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Item Open Access Analyzing and optimizing multibody systems(1992) Bestle, Dieter; Eberhard, PeterOptimization of holonomic as well as non-holonomic multibody systems is presented as a nonlinear programming problem that can be solved with general-purpose optimization codes. The adjoint variable approach is used for calculating design derivatives of a rather general integral type performance measure with respect to design parameters. The resulting equations are solved by numerical integration backward in time. A multi-step integration algorithm with order and step-size control is adapted for this application by including an interpolation scheme. Numerical experiments and a comparison to the common approach of approximating the gradient of the performance measure by finite differences show that high efficiency, accuracy, and reliability are achievable.Item Open Access An orthogonal complement matrix formulation for constrained multibody systems(1994) Blajer, Wojciech; Bestle, Dieter; Schiehlen, WernerA method is proposed for the automatic generation of an orthogonal complement matrix to the constraint matrix for the dynamic analysis of constrained multibody systems. The clue for this method lies in the determination of local constraint matrices and their orthogonal complements relative to the local reference frames of particular constrained points. These matrices are then transformed into the system's configuration space in order to form the final constraint matrix and its orthogonal complement. The avoidance of singularities in the formulation is discussed. The method is specially suited for the dynamic analysis of multibody systems with many constraints and/or closed-loops.Item Open Access Mehrkriterienoptimierung von Mehrkörpersystemen(1994) Eberhard, Peter; Bestle, DieterMit Strategien wie der Zieloptimierung kann man Konflikte zwischen verschiedenen Gütekriterien erkennen und es läßt sich durch geeignete Wahl der Optimierungsziele für jedes Kriterium ein für den Anwender "optimales" Ergebnis ermitteln. Alle Verfahren sind jedoch nur als wertvolle Hilfsmittel anzusehen, die es ermöglichen, das Wissen über den mehrdimensionalen Kriterienraum zu erweitern. Die Entscheidung für einen bestimmten Entwurf ist und bleibt eine echte Ingenieuraufgabe.Item Open Access Optimizacija transportnogo sredstva s aktivno upravljaemymi podveskami(1993) Bestle, Dieter; Schiehlen, Werner; Eberhard, Peter-