Performance analysis of a hybrid one-sided magnetic exciter mounted on a piezoelectric stack

Article type: Research Article

Authors: Nandi, A. | Neogy, S.

Affiliations: Department of Mechanical Engineering, Jadavpur University, Kolkata 700 032, India

Note: [] Corresponding author. E-mail: [email protected], [email protected]

Abstract: The present work proposes a non-contact hybrid exciter especially useful for harmonic excitation of lightly damped structures/rotors. In the proposed exciter an electromagnet is placed on a piezoelectric stack and the extension of the piezoelectric stack is made almost equal to the displacement of the structure using a simple tracking control. This largely eliminates stiffness coupling between the structure/rotor and the exciter and non-linearity in the excitation force due to the vibration of the structure/rotor. The stiffness and inertia of the piezoelectric stack is considered in the analysis. A SIMULINK model of the combined structure and the exciter is developed for a full time-domain simulation of the excitation system.

Keywords: Piezoelectric stack, magnetic actuator, vibration exciter, non-contact excitation

DOI: 10.3233/SAV-2010-0512

Journal: Shock and Vibration, vol. 17, no. 2, pp. 205-215, 2010