Accession Number : ADP000965

Title :   Component Mode Analysis of Large Scale Inertia Variant Mechanical Systems with Flexible Elements and Control Systems,

Corporate Author : IOWA UNIV IOWA CITY COLL OF ENGINEERING

Personal Author(s) : Shabana,Ahmed A. ; Wehage,Roger A.

Report Date : JAN 1983

Pagination or Media Count : 24

Abstract : A method is presented for transient dynamic analysis of mechanical systems composed of interconnected rigid and flexible bodies that undergo large angular displacements. Gross displacement of elastic bodies is represented by superposition of local linear elastic deformation on nonlinear displacement of body reference coordinate systems. Flexible bodies are thus represented by combined sets of reference and local elastic variables. Modal analysis and substructuring of the local elastic system is employed to identify all modes and eliminate the insignificant ones. Equations of motion and constraints are formulated in terms of a minimal set of modal and reference generalized coordinates, which are then dynamically adjusted to a time and inertia-variant eigenspectrum. Control system differential equations are formulated and coupled with mechanical system models. The composite nonlinear system of equations is then numerically integrated in the time domain, to obtain complete system dynamic response. Example problems are presented to demonstrate the algorithms and computer code. (Author)

Descriptors :   *Mechanical properties, *Mechanical engineering, *Inertia, *Elastic properties, *Dynamic response, *Control systems, *Numerical methods and procedures, Displacement, Methodology, Transients, Algorithms, Equations of motion, Differential equations, Degrees of freedom, Rigidity, Interactions, Deformation, Cartesian coordinates, Matrices(Mathematics)

Distribution Statement : APPROVED FOR PUBLIC RELEASE