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 yr study venture dedicated to dynamics of multibody platforms. during this undertaking universities and learn facilities cooperated with the objective to advance a basic 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. varied multibody formalisms should be mixed with assorted simulation programmes through standardized interfaces. For the DFG undertaking the database RSYST used to be selected utilizing general FORTRAN seventy seven and an item orientated multibody procedure datamodel used to be outlined. The undertaking incorporated • learn at the basics of the strategy of multibody platforms, • options for brand new formalisms of dynamical research, • improvement of effective numerical algorithms and • cognizance of a strong software program package deal of multibody platforms. those objectives required an interdisciplinary cooperation among arithmetic, compu­ ter technological know-how, mechanics, and regulate thought. ix X After a rigorous reviewing approach the subsequent examine associations participated within the undertaking (under the accountability of best 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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Example text

Deformable bodies in modal representation are defined by class modal. This extension of the data model is due to Wallrapp [13]. Class modal is a subclass of class part and has the restriction that the frames on such a part have to be directly or indirectly derived from class node. Class node is a subclass of frame and describes a material point in the modal representation. Description of Interaction Elements An object of class interact describes the interaction between a frame A on one part and a frame B on another part, see Figure 3.

Additional frames on a part are defined with respect to a reference frame which is either the part reference frame or another already defined frame. In Figure 3, every frame is connected with its corresponding reference frame by a dashed line with an arrow. By definition, the frame reference topology on a part is always a tree structure with the part reference frame as the root . Parts, frames, and interaction elements are identified in the same way by unique names. The name of a part or an interaction element must be unique with respect to all other parts or interaction elements of the multibody system.

Modelling of this kind is based on a symbolic model description language (DSL Dynamic System Language) [6] evolved by the Department of Automatic Control in Mechanical Engineering at the University of Paderbom. It is based on the explicit state-space representation and allows description of complex, nonlinear, hierarchically organized models. It is the model description language of the Computer-Aided Mechatronic Laboratory (CAMeL) [ 10] developed in Paderbom and allows access to the computer-integrated development tools for analysis and synthesis of linear and nonlinear systems.

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