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Proceedings Paper

On the use of electrical and optical strain gauges paired to magnetostrictive patch actuators
Author(s): Francesco Braghin; Simone Cinquemani; Gabriele Cazzulani; Lorenzo Comolli
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Paper Abstract

Giant Magnetostrictive Actuators (GMA) can be profitably used in application of vibration control on smart structures. In this field, the use of inertial actuators based on magnetostrictive materials has been consolidate. Such devices turn out to be very effective in applications of vibration control, since they can be easily paired with sensors able to ensure the feedback signal necessary to perform the control action. Unlike most widespread applications, this paper studies the use of patch magnetostrictive actuators. They are made of a sheet of magnetostrictive material, rigidly constrained to the structure, and wrapped in a solenoid whose purpose is to change the intensity of the magnetic field within the material itself. The challenge in the use of such devices resides in the impossibility of having co-located sensors. This limit may be exceeded by using strain gauge sensors to measure the deformation of the structure at the actuator. This work analyzes experimentally the opportunity of introducing, inside a composite material structure, both the conventional electric strain gauges and the less conventional optical sensors based on Bragg’s gratings. The performance of both solutions are analyzed with particular reference to the signal to noise ratio, the resolution of the sensors, the sensitivity to variations of the electric and magnetic fields and the temperature change associated with the operation of the actuator.

Paper Details

Date Published: 10 April 2014
PDF: 6 pages
Proc. SPIE 9061, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2014, 906133 (10 April 2014); doi: 10.1117/12.2045044
Show Author Affiliations
Francesco Braghin, Politecnico di Milano (Italy)
Simone Cinquemani, Politecnico di Milano (Italy)
Gabriele Cazzulani, Politecnico di Milano (Italy)
Lorenzo Comolli, Politecnico di Milano (Italy)

Published in SPIE Proceedings Vol. 9061:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2014
Jerome P. Lynch; Kon-Well Wang; Hoon Sohn, Editor(s)

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