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S25 Métodos Numéricos |
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Title:
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ANALYSIS OF STOCHASTIC STRUCTURES BY PERTURBATION METHOD
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Summary :
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IN THIS PAPER WE ANALYZE THE MODAL CHARACTERISTICS OF STRUCTURES INCLUDING RANDOM PARAMETERS. WE COMPUTE THE MEAN VALUE AND THE STANDARD DEVIATION OF THE EIGENVALUES AND EIGENVECTORS AND ALSO OF THE TRANSFER FUNCTIONS. THE STOCHASTIC FINITE ELEMENT METHOD BASE ON PERTURBATION TECHNIQUE, WILL BE USED TO DO SO. THE STOCHASTIC FINITE ELEMENT METHOD ATTEMPT TO COMBINE THE FINITE ELEMENT ANALYSIS AND THE STOCHASTIC ANALYSIS. LIMITS OF PERTURBATION APPROACH ARE STUDIED IN TERMS OF SENSITIVITY OF THE SOLUTION (MODAL PARAMETERS AND TRANSFER FUNCTIONS) VERSUS THE RANDOM PARAMETERS VALUES. A MONTE CARLO SIMULATION IS USED TO VALIDATE OUR RESULTS. IN ORDER TO REDUCE THE NUMBER OF DEGREES OF FREEDOM OF THE MODEL AND THE TIME CONSUMING, A MODAL SYNTHESIS APPROACH EXTENDED TO THE CASE OF STRUCTURES DEFINED BY STOCHASTIC PARAMETERS IS USED. WE WILL EMPHASIZE THE EFFICIENCY OF THIS PROCEDURE IN THE ESTIMATION OF THE MEAN VALUE AND THE STANDARD DEVIATION OF THE MODAL PARAMETERS.
KEYWORDS: MODAL SYNTHESIS; STOCHASTIC PARAMETERS; PERTURBATION |
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Author :
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DINIZ, Alberto C.G.C
THOUVEREZ, Fabrice 0
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Paper View :
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