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S5 Controle Ativo de Vibrações e Estruturas Inteligentes |
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Title:
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ACTIVE CONTROL OF THE STRUCTURAL INTENSITY IN BEAMS CONSIDERING MULTIPLE FREQUENCY EXCITATION
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Summary :
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THIS PAPER EXPOSES AN ACTIVE CONTROL METHOD CONSISTING OF MINIMIZING
THE ACTIVE PART OF THE STRUCTURAL INTENSITY AIMING AT REDUCING THE
OVERALL VIBRATION LEVEL IN BEAMS. THE BASIC IDEA BEHIND THIS
STRATEGY IS THAT THE CONTROL FORCES DISSIPATE THE INPUT POWER DUE
TO THE PERTURBING FORCES, THUS PREVENTING THE STRUCTURE FROM HAVING
TO VIBRATE IN ORDER TO DISSIPATE THE INCOMING ENERGY. A
FREQUENCY-DOMAIN ADAPTIVE STRUCTURAL INTENSITY CONTROL METHOD
(ASIC) IS USED. THE METHOD IS INVESTIGATED USING A SIMPLE EXAMPLE
CONSISTING OF AN ALUMINUM BEAM WHICH IS FITTED AT ONE END WITH A
QUASI-ANECHOIC TERMINATION (SAND BOX) AND HAS THE OTHER END FREE.
NUMERICALLY SIMULATED RESULTS FOR MULTIPLE-FREQUENCY EXCITATIONS
ARE PRESENTED. THE SIMULATION USES A STATE-SPACE MODEL WHICH WAS
IDENTIFIED USING EXPERIMENTAL DATA. RESULTS ARE COMPARED WITH
THOSE OBTAINED USING THE INSTANTANEOUS WAVE AMPLITUDE AS ERROR
SIGNAL IN TIME-DOMAIN LMS CONTROL SCHEME. THE ASIC METHOD PRESENTED A BETTER
PERFORMANCE THAN THE OTHER CONTROLLER EN ALL THE SIMULATED CASES.
KEYWORDS: STRUCTURAL INTENSITY, POWER FLOW, ADAPTIVE CONTROL, VIBRATION,
ACTIVE CONTROL. |
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Author :
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Arruda, Jos?Roberto F.
Pereira, Allan K. A.
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Paper View :
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