Advanced Multibody System Dynamics: Simulation and Software by Edward J. Haug (auth.), Werner Schiehlen (eds.)

By Edward J. Haug (auth.), Werner Schiehlen (eds.)

The German learn Council (DFG) made up our minds 1987 to set up a national 5 12 months learn venture dedicated to dynamics of multibody platforms. during this undertaking universities and study facilities cooperated with the objective to boost a normal pur­ pose multibody process software program package deal. this idea presents the chance to take advantage of a modular constitution of the software program, i.e. various multibody formalisms will be mixed with diversified simulation programmes through standardized interfaces. For the DFG venture the database RSYST was once selected utilizing ordinary FORTRAN seventy seven and an item orientated multibody approach datamodel used to be outlined. The venture integrated • examine at the basics of the tactic of multibody structures, • suggestions for brand new formalisms of dynamical research, • improvement of effective numerical algorithms and • awareness of a strong software program package deal of multibody structures. those ambitions required an interdisciplinary cooperation among arithmetic, compu­ ter technology, mechanics, and keep watch over concept. ix X After a rigorous reviewing method the subsequent learn associations participated within the venture (under the accountability of major scientists): Technical collage of Aachen (Prof. G. Sedlacek) Technical college of Darmstadt (Prof. P. Hagedorn) collage of Duisburg M. Hiller) (Prof.

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G. for frames, joints, and forces. This is shown on the example of class joint: whenever an object of class joint is required in the data model, an object of any class can be used which is directly or indirectly derived by inheritance from the superclass joint. Objects of other classes are rejected. 2 Methods The second part of a class description consists of the specification of the available methode. The data model supports two groups of methods: Administrative methods are used to manage and manipulate data objects and to access data values.

J. Drosdol and F. Panik, The Daimler-Benz Driving Simulator, A Tool for Vehicle Development, Society of Automotive Engineers, 1986. 18. Feasibility and Conceptual Design of National Advanced Driving Simulator, DOT HS 807 596, US Department of Transportation, National Highway Traffic Safety Administration, March 1990. An Object-Oriented Data Model for Multibody Systems M. Otter Institute for Robotics and System Dynamics German Aerospace Research Establishment (DLR), Oberpfaffenhofen M. Hocke Computer Center of the University of Stuttgart (RUS) A.

At a basic level the data model supports the following elementary data types: Integer value. Single precision floating point value. Double precision :floating point value. Character string of variable or fixed length. Special character string. A name must begin with a letter and may not have more than 8 characters. sname Unique identifier to address any component of the data model. A sname is implemented as a succession of names, each separated by an underscore. dparam Parameter which either stores a name or a double precision value.

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