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Proceedings Paper

Shock isolation using magnetostrictive actuator
Author(s): Y. Krishna; B. S. Sarma; U. Shrinivasa
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Paper Abstract

The proposed shock isolator is a single degree of freedom model where the payload mass is isolated from base disturbances by varying the stiffness of the spring. One spring always forms an interface between the mass and the base. The other spring makes or breaks contact with the base with the help of magnetorestrictive actuator depending upon the magnitude of the relative velocity. The actuator develops the required force that acts normal to the sliding surfaces of the spring and the base to produce the necessary coulomb friction force for locking the spring with the base thus altering the stiffness. The magnetorestrictive material considered here is Terfenol-D that responds to an external magnetic field proportional to the surrounding coil current. The actuator is switched on/off depending upon the magnitude of the relative velocity which in turn reduces or increases the stiffness of the isolator and thus provides the control on response. The performance of the proposed isolation and control scheme is evaluated in terms of the shock acceleration ratio and the relative displacement ratio across the isolator. A mathematical model for the proposed shock isolation system is developed and simulation results show that the performance of the proposed scheme is better when compared with that of a passive isolator for rounded pulse and rounded step displacement excitations at the base.

Paper Details

Date Published: 14 October 2003
PDF: 8 pages
Proc. SPIE 5062, Smart Materials, Structures, and Systems, (14 October 2003); doi: 10.1117/12.514763
Show Author Affiliations
Y. Krishna, Defence Research and Development Lab. (India)
B. S. Sarma, Defence Research and Development Lab. (India)
U. Shrinivasa, Indian Institute of Science (India)

Published in SPIE Proceedings Vol. 5062:
Smart Materials, Structures, and Systems
S. Mohan; B. Dattaguru; S. Gopalakrishnan, Editor(s)

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