Todd Nichols

Abstract

For this thesis a new concept, the Passive Remote Electromechanical Dynamic Absorber (RDA) is investigated. The current design utilizes piezoelectric elements to convert the mechanical strain energy of a parent system into electrical energy, which is fed into the RDA. The RDA similarly uses piezoelectric elements to convert the applied electrical energy into mechanical self-excitation. A lumped-system model of the coupled system is developed, accounting for the stiffness and mass of both the parent and RDA systems, along with a coupling stiffness term. Additionally, a coupled-system finite element model, developed in Ansys/multiphysics to include a three dimensional representation of the coupled system, is considered. Experimental work is conducted to validate the concept of the lumped system model and to validate the finite element modeling technique. A reasonable correlation between the experimental results and the analytical predictions validate the qualitative analysis. FEA such as was developed for this thesis in ANSYS/Multiphysics can reasonably predict the actual performance of an RDA. Furthermore, analytical predictions of the RDA show successful reduction of the parent response by up to -30 db, in a narrow frequency band around its uncoupled resonant frequency. The overall qualitative agreement between the analytical and the experiment confirm the validity and potential of the proposed Remote Electromechanical Dynamic Absorber for vibration suppression of dynamic systems.

Library of Congress Subject Headings

Electromechanical devices--Design and construction; Vibration--Control; Damping (Mechanics)

Publication Date

10-1-2001

Document Type

Thesis

Department, Program, or Center

Mechanical Engineering (KGCOE)

Advisor

Ghoneim, Hany

Advisor/Committee Member

Pokines, Brett

Advisor/Committee Member

Torok, Josef

Comments

Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works. Physical copy available through RIT's The Wallace Library at: TK355 .N534 2001

Campus

RIT – Main Campus

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