COBEM99

S5 Controle Ativo de Vibrações e Estruturas Inteligentes

Title:

A MODEL UPDATING-BASED METHOD FOR THE OPTIMUM DESIGN OF BEAMLIKE DYNAMIC VIBRATION ABSORBERS

Summary :

THIS PAPER IS FOCUSED ON A METHODOLOGY INTENDED FOR THE OPTIMUM DESIGN OF BEAMS AS DYNAMIC VIBRATION ABSORBERS (DVA S). IT UTILIZES A SUBSTRUCTURE COUPLING TECHNIQUE EXPLORING FREQUENCY RESPONSE FUNCTIONS (FRF S), WHICH ENABLES TO CALCULATE THE FRF S OF THE COMPOSITE STRUCTURE (PRIMARY STRUCTURE+DVA), GIVEN THE FRF S OF THESE TWO COMPONENTS. THE FRF S OF THE PRIMARY SYSTEM CAN BE DERIVED EITHER EXPERIMENTALLY OR FROM AN ANALYTICAL MODEL, WHEREAS THE FRF S OF THE DVA ARE OBTAINED FROM A FINITE ELEMENT MODEL. THE FRF S OF THE COMPOUND STRUCTURE ARE USED TO DEFINE PERFORMANCE INDEXES RELATED TO THE VIBRATION LEVEL OF THE SYSTEM OVER A PREVIOUSLY CHOSEN FREQUENCY BAND. THIS INDEX IS THEN OPTIMIZED, WITH RESPECT TO THE DESIGN PARAMETERS, WHICH ARE CHOSEN TO BE THE PHYSICAL AND/OR GEOMETRICAL PROPERTIES OF THE FINITE ELEMENT MODEL OF THE DVA. THE OPTIMIZATION IS PERFORMED BY USING GENETIC ALGORITHMS (GA S). THE FIRST PART OF THE PAPER IS DEVOTED TO THE FORMULATION OF THE SUBSTRUCTURE COUPLING TECHNIQUE, THE DEFINITION OF PERFORMANCE INDEXES AND A BRIEF REVIEW OF GA S. A NUMERICAL EXAMPLE IS THEN FULLY DESCRIBED TO ILLUSTRATE THE MAIN FEATURES OF THE PROPOSED METHODOLOGY. KEY-WORD: DYNAMIC VIBRATION ABSORBERS, DAMPING, VIBRATION CONTROL, OPTIMIZATION

Author :

Cunha Jr., Sebastião Simões
Rade, Domingos Alves

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