Combined experimental/analytical modeling using component mode synthesis

Conference · Sun Jan 01 04:00:00 EST 1984

OSTI ID:5254186

Martinez, D R; Carne, T G; Gregory, D L; Miller, A K

This study evaluates the accuracy of computed model frequencies and mode shapes obtained from a combined experimental/analytical model for a simple beam structure. The structure was divided into two subsystems, and one subsystem was tested to obtain its free-free modes. Using a Component Mode Synthesis (CMS) technique, the experimental model data base for one subsystem was directly coupled with a finite element model of the other subsystem to create an experimental/analytical model of the total structure. Both the translational and rotational elements of the residual flexibilities and mode shapes at the interface of the experimental subsystem were measured and used in the coupling. The modal frequencies and mode shapes obtained for the combined experimental/analytical model are compared to those for a reference finite element model of the entire structure. The sensitivity of the CMS model predictions to errors in the modal parameters and residual flexibilities, which are required to define a subsystem, is also examined.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5254186
• Report Number(s): SAND-83-1889C; CONF-8405127-2; ON: DE84008293
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420100* -- Engineering-- General Engineering-- (-1987)
MATHEMATICAL MODELS
MECHANICAL STRUCTURES
MECHANICAL VIBRATIONS
SENSITIVITY ANALYSIS