Design of fish fin actuators using shape memory alloy composites

Nagato Ono; Masahiro Kusaka; Minoru Taya; Chiyuan Wang

doi:10.1117/12.539856

29 July 2004 Design of fish fin actuators using shape memory alloy composites

Nagato Ono, Masahiro Kusaka, Minoru Taya, Chiyuan Wang

Proceedings Volume 5388, Smart Structures and Materials 2004: Industrial and Commercial Applications of Smart Structures Technologies; (2004) https://doi.org/10.1117/12.539856
Event: Smart Structures and Materials, 2004, San Diego, CA, United States

Abstract

The present paper considers a design of fish fin actuators based on shape memory alloy composites composed of a couple of plates with the opposite functions. Both SMA plates, whose microstructure is either martensite or austenite, are individually arranged in parallel and operated as a bias to each other. The actuation mechanism is based on change in elastic constant, from stiff to soft during austenite to martensite transformation. First, a preliminary model of the elastic and superelastic deformation is proposed for prediction of the optimum curvature of SMA plates, which enable us to control the steering of an underwater object. The analytical model provides the relationship between the bending moment and the curvature for the composite plates in each deformation range. For a given velocity of a moving fish robot, the underwater curvature and bending moment of its plates is successfully obtained. We design such a fish fin actuator made of a set of different types of SMA composite plates which are embedded in an elastometer matrix to form a fish tail fin.

Citation Download Citation

Nagato Ono, Masahiro Kusaka, Minoru Taya, and Chiyuan Wang "Design of fish fin actuators using shape memory alloy composites", Proc. SPIE 5388, Smart Structures and Materials 2004: Industrial and Commercial Applications of Smart Structures Technologies, (29 July 2004); https://doi.org/10.1117/12.539856

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