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Theoretical and experimental studies on vibration control in cantilever beams using DC magnets

DSpace at IIT Bombay

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Title Theoretical and experimental studies on vibration control in cantilever beams using DC magnets
 
Creator JOSHI, A
 
Subject absorber
actuator
self-sensing actuator
dc magnet actuator
vibration control
beams
 
Description This paper describes the investigations that have been carried out on vibration control in cantilever beams using a DC magnet actuator. A repulsive type DC magnet configuration is postulated and its force characteristics are investigated, as a function of the air gap, the strength of the magnetic field, and its location on the beam. A strategy is developed to deal with inherent nonlinearity in the magnetic force effect. A modal formulation of the structural dynamics is used so that the method can be applied to any type of beam and some generic trends can be deduced. These results show that it is possible to arrive at a general configuration of a repulsion type magnetic actuator, which renders the beam axis as a stable equilibrium point, with reference to the restoring force from the magnets. Further, for a given air gap, this restoring force is a nonlinear function of the normalized disturbance, with a hardening type of behavior. Next, the vibration control problem is formulated using DC magnets, in the form of a SIMULINK(C) block diagram. The results concerning reduction in tip deflection are generated to quantify the extent of vibration suppression in the first vibration mode. Finally, a limited experimental study is carried out on a uniform cantilever beam to validate some of the assumptions of the theoretical study.
 
Publisher SAGE PUBLICATIONS LTD
 
Date 2011-08-29T02:30:44Z
2011-12-26T12:58:20Z
2011-12-27T05:48:03Z
2011-08-29T02:30:44Z
2011-12-26T12:58:20Z
2011-12-27T05:48:03Z
2004
 
Type Article
 
Identifier JOURNAL OF VIBRATION AND CONTROL, 10(7), 995-1008
1077-5463
http://dx.doi.org/10.1177/1077546304041371
http://dspace.library.iitb.ac.in/xmlui/handle/10054/11923
http://hdl.handle.net/10054/11923
 
Language en