COBEM99

S21 Vibrações e Análise Modal

Title:

STRUCTURAL DYNAMICS ANALYSIS USING MODE SYNTHESIS TECHNIQUES

Summary :

ABSTRACT. STRUCTURAL DYNAMIC ANALYSIS USING THE CLASSICAL FINITE ELEMENT METHOD APPLIED TO COMPLEX AERONAUTICAL STRUCTURES, SUCH AS WINGS WITH EXTERNAL STORES, TIP TANKS AND SIDE WINDERS, PRESENTS HUGE MODELS WITH MANY DEGREES OF FREEDOM, THAT RENDER THE ANALYSIS EXTREMELY COSTLY. FURTHER, IN MANY CIRCUMSTANCES THE PARTS ARE PRODUCED BY DIFFERENT DESIGN TEAMS AND/OR ORGANIZATIONS, AND SOMETIMES IN DIFFERENT COUNTRIES, THIS FACT RENDER THEIR CLASSICAL FINITE ELEMENT MODELS INTEGRATION EXTREMELY DIFFICULT AND TIME CONSUMING. MOREOVER, IN MANY CASES THE BUILDERS OF THESE STRUCTURAL PARTS FURNISH THEIR STRUCTURAL DYNAMIC PROPERTIES ONLY AS MODAL CHARACTERISTICS OBTAINED FROM GROUND VIBRATION TESTS OR CLASSICAL ENGINEERING ANALYSIS. THE MODAL SYNTHESIS TECHNIQUES PRESENT AN EFFECTIVE ALTERNATIVE FOR THE STRUCTURAL DYNAMIC ANALYSIS OF SUCH COMPLEX STRUCTURES AND THEIR INTEGRATION, AT THE SAME TIME REPRESENT A COMPUTATION RESOURCES SAVING. THE PRESENT WORK ADDRESS SEVERAL ASPECTS INVOLVED IN THE FORMULATION OF THE MODAL SYNTHESIS TECHNIQUES, AND DISCUSS THEIR RELATIVE MERITS, ACCURACY AND COMPUTATIONAL EFFICIENCY. THE APPLICATION OF THE METHOD TO COMPLEX STRUCTURES IS PRESENTED AND THE RESULTS OBTAINED ARE DISCUSSED AND COMPARED WITH THE SOLUTION OF FULL FINITE ELEMENT MODELS. KEY WORDS: MODE SYNTHESIS, STRUCTURAL DYNAMICS, FINITE ELEMENTS

Author :

Bismarck-Nasr, Maher Nasr
Lucht, Richard Rigobert

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