By Edward J. Haug (auth.), Werner Schiehlen (eds.)
The German examine Council (DFG) determined 1987 to set up a national 5 yr examine undertaking dedicated to dynamics of multibody structures. during this venture universities and learn facilities cooperated with the aim to enhance a normal pur pose multibody process software program package deal. this idea presents the chance to exploit a modular constitution of the software program, i.e. assorted multibody formalisms could be mixed with varied simulation programmes through standardized interfaces. For the DFG venture the database RSYST used to be selected utilizing commonplace FORTRAN seventy seven and an item orientated multibody procedure datamodel used to be outlined. The undertaking integrated • study at the basics of the tactic of multibody platforms, • thoughts for brand spanking new formalisms of dynamical research, • improvement of effective numerical algorithms and • attention of a robust software program package deal of multibody structures. those objectives required an interdisciplinary cooperation among arithmetic, compu ter technology, mechanics, and keep an eye on thought. ix X After a rigorous reviewing technique the subsequent learn associations participated within the venture (under the accountability of major scientists): Technical college of Aachen (Prof. G. Sedlacek) Technical collage of Darmstadt (Prof. P. Hagedorn) college of Duisburg M. Hiller) (Prof.
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Additional resources for Advanced Multibody System Dynamics: Simulation and Software Tools
Class frame has only the component rframe in which the name of the reference frame is stored. Therefore, the position of an object of class frame is identical to its reference frame . g. the position vector and the rotation matrix from the reference frame to the frame. Depending on the implementation, these operations must be redefined in the subclasses of class frame. g. class point defines a frame which is translated relative to its reference frame and class cardan defines a frame which is translated and rotated relative to its reference frame, whereby the rotation is described by roll, yaw , and pitch angles .
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. The name of a frame has to be unique with respect to all other frames on the same part. Class mbs represents the decomposition of a multi body system into the basic elements: due to inheritance, class mbs consists of the components of class block and additionally of the components global, part, and interact.
The file description of this multibody system is given on the next two pages. go unit type default e:z:pr(3:) param nsig name descr go outname output nsig name unit descr input nsig name unit descr go [ 'L2', 'R2', 'K2', 'CK2', '12 ' ] [ 'Length of bar 2' 'Radius of bar 2' 'mass of bar 2' 'center of mass of bar 2' 'principal moment of inertia of bar 2' ] [ 'm' , 'm' , 'kg', 'm', 'kg m••2' ] [ 2 • 2 ' -2 ' -2 ' -2 ] [ 0 . 6E3' ,'L2/2','K2*L2•L2/12'] 5 parameters (system constant) [ 'QOUT', 'QDOUT' ] [ 'rad' , 'rad' ] [ 'Output angle of four bar mechanism' 'First derivative of QOUT' ] [ interact_bar3_member_joint_q interact_bar3_member_joint_qd 2 output signals 'TDRIVE' '111m' 'Driving torque of four bar mechanism' 1 input signals ---------- Parametrized four bar mechanism ----------[0, -1.