Title page for ETD etd-06052002-153552


Type of Document Master's Thesis
Author Vujic, Nikola
URN etd-06052002-153552
Title Power Regeneration in Actively Controlled Structures
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Leo, Donald J. Committee Chair
Inman, Daniel J. Committee Member
Lindner, Douglas K. Committee Member
Keywords
  • electromechanical system
  • vibration isolation
  • state-space
  • energy regeneration
  • control
  • Power flow
Date of Defense 2002-05-31
Availability unrestricted
Abstract
The power requirements imposed on an active vibration isolation system are quite important to the overall system design. In order to improve the efficiency of an active isolation system we analyze different feedback control strategies which will provide electrical energy regeneration. The active isolation system is modeled in a state-space form for two different types of actuators: a piezoelectric stack actuator and a linear electromagnetic (EM) actuator. During regenerative operation, the power is flowing from the mechanical disturbance through the electromechanical actuator and its switching drive into the electrical storage device (batteries or capacitors). We demonstrate that regeneration occurs when controlling one or both of the flow states (velocity and/or current). This regenerative control strategy affects the closed loop dynamics of the isolator which sees its damping reduced.

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