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Proceedings Paper

Smart cylindrical shells without vibration
Author(s): Jinhao Qiu; Junji Tani
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Paper Abstract

One major problem in magnetic resonance image equipment is the high-level noise borne by the vibration of the cylindrical shell to support coils for gradient magnetic fields. The vibration of the shell is excited by the Lorentz force between the pulse current applied to the coils and the main magnetic field. In order to suppress the noise inside the cylindrical shell, it is aimed to control the vibration of the shell. In this paper, simulation is carried out on the vibration control of the shell by using distributed piezoelectric actuators. The actuators produce bending moment or in-plane force when pulse voltages are applied synchronously with the pulse current of the coils. Coupling of actuators and vibration modes, and parameter optimization are also discussed. The simulation results show that the vibration level is successfully reduced in the frequency range of 400 approximately 1200 Hz.

Paper Details

Date Published: 8 May 1995
PDF: 12 pages
Proc. SPIE 2443, Smart Structures and Materials 1995: Smart Structures and Integrated Systems, (8 May 1995); doi: 10.1117/12.208298
Show Author Affiliations
Jinhao Qiu, Tohoku Univ. (Japan)
Junji Tani, Tohoku Univ. (Japan)


Published in SPIE Proceedings Vol. 2443:
Smart Structures and Materials 1995: Smart Structures and Integrated Systems
Inderjit Chopra, Editor(s)

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