By Edward J. Haug (auth.), Werner Schiehlen (eds.)
The German examine Council (DFG) made up our minds 1987 to set up a national 5 12 months study undertaking dedicated to dynamics of multibody platforms. during this venture universities and examine facilities cooperated with the target to enhance a normal pur pose multibody approach software program package deal. this idea presents the chance to take advantage of a modular constitution of the software program, i.e. assorted multibody formalisms might be mixed with diversified simulation programmes through standardized interfaces. For the DFG venture the database RSYST was once selected utilizing commonplace FORTRAN seventy seven and an item orientated multibody procedure datamodel was once outlined. The undertaking integrated • learn at the basics of the tactic of multibody structures, • techniques for brand spanking new formalisms of dynamical research, • improvement of effective numerical algorithms and • attention of a strong software program package deal of multibody structures. those objectives required an interdisciplinary cooperation among arithmetic, compu ter technological know-how, mechanics, and keep an eye on thought. ix X After a rigorous reviewing technique the subsequent study associations participated within the venture (under the accountability of top scientists): Technical collage of Aachen (Prof. G. Sedlacek) Technical college of Darmstadt (Prof. P. Hagedorn) college of Duisburg M. Hiller) (Prof.
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Additional info for Advanced Multibody System Dynamics: Simulation and Software Tools
This operation will complain, if the connection structure is contradictory. 4 Extensions The multibody system data model has been extended in several directions. Wallrapp  has added classes to describe deformable bodies in modal representation. This representation includes higher order terms to allow the formulation of the "geometric stiffening" effect. Daberkow  has added classes to describe the geometric properties of multibody systems as needed for high speed visualization and animation and extracts these data from a CAD-3D-system.
Special treatment is required for the mechanical components. This paper presents two methods of building up multibody systems in a modular and hierarchical manner. One of them is based on force connections and the other on a recursive Newton-Euler algorithm, specially designed for computation. Either method allows independent generation of aggregates and functional groups of a system, management and then re-coupling with computer support; thus a kind of modelling is made possible which closely follows the structure of the technical system.
M first translation distance offset rotation angle offset dist2 dparam 0. m second translation distance offset 45 Class jointfix describes a joint with zero degrees of freedom. class: name jointfix I type I min I maz I default I unit I description of component subclassof (joint) no components Class r3t3 describes a joint with six degrees of freedom. r3t3 class: name type min maz default unit description of component subclassof (joint) axleseq int (3) -3 3 1, 2, 3 rangles dparam (3) -271" 211" 3 * 0.