COBEM99

S5 Controle Ativo de Vibrações e Estruturas Inteligentes

Title:

SYSTEM ELECTRIC-MECHANIC FOR ACTIVE CONTROL OF VIBRATIONS

Summary :

THIS PAPER PROPOSES A MODEL TO ISOLATE BASE VIBRATIONS IN LOW FREQUENCY. SUCH MODEL, CONSISTS OF A LEVER SYSTEM BI-SUPPORTED IN SYSTEMS ENDOWED WITH STIFFNESS AND DAMPING AND THAT THEY LINK THE LEVER TO THE BASE AND TWO MASSES PLACED IN THE ENDS OF THE LEVER, A REPRESENTING A SYSTEM ANY TO BE ISOLATED AND THE ANOTHER USED AS INSULATOR. BESIDES, THE MODEL IS STILL COMPOSED BY A SYSTEM OF ACTIVE CONTROL THAT SEEKS TO PROPITIATE THE WANTED ISOLATION. THE MODEL IS OBTAINED, INITIALLY FOR THE LEVER SYSTEM, FOR WHICH THEY ARE DEVELOPED DYNAMIC ANALYSES, IDENTIFYING THE CRITICAL MODES OF THE SYSTEM. AFTER HAVING MODELED AND ANALYZED THE LEVER SYSTEM, WE MODELED THE CONTROL SYSTEM, FORMED BY A SENSOR ONE GENERIC AND AN ATUATOR ELECTRIC-MECHANIC, COMPOSED OF A MOTOR DC AND ENDLESS SCREW. THIS ATUATOR STARTS TO COMPOSE THE CENTRAL SUPPORT OF THE LEVER, ACTING IN THE CENTER OF MASS OF THIS, IN WAY TO CAUSE VERTICAL DISPLACEMENTS THAT HAVE THE OBJECTIVE OF COMPENSATING THE VIBRATIONS OF THE BASE. AFTER OBTAIN THE MODEL, CONTROL TECHNIQUES ARE APPLIED, IN THE ANALYSIS OF THE PERFORMANCE OF THE SYSTEM WHEN OF THE INSERT OF ELECTRONIC CONTROLLER IN THE CONTROL SYSTEM, THAT THEY SEEK TO PROPITIATE THE REDUCTION OF THE DOMINANT MODES, AND CONSEQUENTLY, A SIGNIFICANT IMPROVEMENT IN THE ANSWER OF THE SYSTEM. THROUGH SIMULATION, WE ANALYZED THE ACTING OF THE SYSTEM FOR KNOWN ENTRANCES AND ITS ANSWER IN THE ISOLATION OF BASE VIBRATIONS IN LOW FREQUENCY, WITH THAT WE CHECKED THE EFFICIENCY AND APPLICATION POSSIBILITY OF THE DEVELOPED SYSTEM. FINALLY, WE BELIEVED THAT THE MAIN CONCLUSION OF THIS PAPER WAS THE GOOD ISOLATION OF THE BASE VIBRATIONS OBTAINED IN THE SIMULATIONS

Author :

Araújo, Clivaldo Silva de
Dana, Seyyed Said
de Araújo, Fábio Meneghetti Ugulino

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