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Proceedings Paper

Adaptive feedforward control of beam structure using PVDF modal sensor and SMA/CFRP hybrid actuator
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Paper Abstract

During construction of extra high structures such as a skyscraper or a main tower of a long bridge, just a slight wind can generate low frequency vibration, and the maximum displacement at the top of structure can increase up to a few meters. Occurrence of low frequency vibration causes a fear of operators and it deteriorates awfully safeness. The purpose of this paper is a control of low frequency vibration above-mentioned with a development of small-lightweight actuator which can control a big displacement and that of control system which guarantees a stable control. As a first step, beam structure is estimated. Design of modal sensor using PVDF film sensor is explained. For an actuator, SMA/CFRP hybrid moment actuator is used. This actuator has been developed in the recent studies by authors with special consideration on the interfacial strength between SMA wires and matrix. Basic characteristics of this actuator is presented in this paper. To drive this moment actuator smoothly, punctual temperature control in real time which includes rapid heating, exact current control and some cooling control is required. Adaptive feedforward control system is, therefore, designed here for this actuator aiming to apply to beam structure. As a result, control effect on beam structure is demonstrated experimentally. Verification of performance of this actuator is also shown.

Paper Details

Date Published: 11 March 2003
PDF: 12 pages
Proc. SPIE 4946, Transducing Materials and Devices, (11 March 2003); doi: 10.1117/12.468282
Show Author Affiliations
Kaori Yuse, National Institute of Advanced Industrial Science and Technology (Japan)
Yoshihiro Kikushima, National Institute of Advanced Industrial Science and Technology (Japan)
Ya Xu, National Institute of Advanced Industrial Science and Technology (Japan)

Published in SPIE Proceedings Vol. 4946:
Transducing Materials and Devices
Yoseph Bar-Cohen, Editor(s)

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