Affiliation:
1. Harbin Institute of Technology
Abstract
This paper is concerned about a design of a new deployable antenna actuated by 6 shape
memory alloy (SMA) hinges. The antenna consists of 6 radial, tensioned, parabolic, deployable ribs
connecting to a central hub. The hinge, located at each rib, is used of the Nitinol SMA material due to
the ability to generate large strains and electrical resistive actuation. The elongated SMA wire is
heated by an electrical current, caused to contract in response to a converse thermally-induced phase
transformation. The resulting tension creates a moment, imparting rotary motion between two
adjacent beams. The concept and operation of deployable antenna system are discussed in detail, and
a dynamic simulation is presented. A series of experiments are performed on the SMA actuator to
investigate the system behavior in the process of deployment. Results indicated that the hinge with
low speed rotation and easy fabrication achieves reliable actuation for the deployment of the antenna,
and the antenna demonstrates a high deployment-to-stowage volume ratio.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
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