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)
Department, Program, or Center
Mechanical Engineering (KGCOE)
Nichols, Todd, "Experimental and analytical investigation of a passive remote electromechanical dynamic absorber" (2001). Thesis. Rochester Institute of Technology. Accessed from
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