Abstract
We present a brief summary of new technical developments of passive and active vibrationcontrols which we have performed for the last several years partly as an internationalcollaborative R&D project on Smart Materials and Structural Systems sponsored by theJapanese Ministry of Economy, Trade and Industry. In connection with the passivedamping control, shape memory alloys (SMAs) were used as damping elements. Toexamine the effect of damping enhancement, beams with SMA films bonded ontothem or SMA wires embedded into them were made, and free damped oscillationswere measured. The damping coefficient increased by more than 100% comparedwith the beams without SMAs. Thermodynamic behaviors of an SMA wire andfilm were also investigated experimentally and numerically. In active vibrationcontrol, a new concept of smart material systems was proposed. That is a partiallymagnetized alloy, which is stiff and strong enough as a structural element and respondssufficiently quickly as an actuator due to an electromagnetic force. A simplifiedexperiment and numerical simulation were performed and the results showed thefeasibility of the proposed smart material system using the electromagnetic force.
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