OPTIMIZATION OF PASSIVE CONSTRAINED LAYER DAMPING TREATMENTS APPLIED TO COMPOSITE BEAMS

摘要: THE GEOMETRICAL OPTIMIZATION OF PASSIVE DAMPING TREATMENTS APPLIED TO LAMINATED COMPOSITE BEAMS IS PRESENTED, USING A SANDWICH/MULTILAYER BEAM FINITE ELEMENT MODEL. FREQUENCY DEPENDENCE VISCOELASTIC MATERIAL PROPERTIES MODELED ANELASTIC DISPLACEMENT FIELDS COMPLEX-BASED MODAL REDUCTION, FOLLOWED BY AN EQUIVALENT REAL REPRESENTATION, CONSIDERED. CONSISTING LAYERS SANDWICHED BETWEEN TWO ARE STUDIED, WITH UPPER LAYER SERVING AS CONSTRAINING (CL) AND LOWER ONE SPACER (OR STAND-OFF) (SL). CL SL PLIES NUMBER, THICKNESS ORIENTATION CONSIDERED DESIGN PARAMETERS OPTIMIZED GENETIC ALGORITHM EIGENFREQUENCY CHANGES WEIGHT CONSTRAINTS. STRATEGY FOR MULTICRITERIA PRESENTED USING, PERFORMANCE INDICES, INTEGRAL TRANSVERSE VELOCITIES FACTORS FIRST ¯VE EIGENMODES AND, PENALTY FUNCTIONS, TOTAL MASS VARIATION EIGENFREQUENCIES DUE TREATMENT. RESULTS SHOW THAT USE GLOBAL COST FUNCTION ALLOWS IMPROVE STRUCTURAL VIBRATIONS WHILE MINIMIZING STRUCTURE MODIFICATION