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Journal of Applied Sciences
  Year: 2010 | Volume: 10 | Issue: 17 | Page No.: 1973-1977
DOI: 10.3923/jas.2010.1973.1977
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An Assessment of the Body Joint Bending Actuator using a Shape Memory Alloy

Yao-Jen Lai, Long-Jyi Yeh and Min-Chie Chiu

To strengthen limbs which are injured in an accident, a traditional rehabilitation device has been adopted. However, it is heavy and complex, a light-weight body joint bending actuator which is made of a Shape Memory Alloy (SMA) and is simpler than traditional rehabilitation devices is therefore proposed. Here, an SMA-made actuator can offer the resistance needed for a rehabilitation program. A Ti-Ni based SMA is adopted for the body joint bending actuator. To facilitate the swinging angle and the related bending torque, various structures of the SMA-made body joint bending actuators (a one-bunch SMA actuator and a six-bunch SMA actuator) have been adjusted in the experimental work by varying the number of SMA fibers in a bounded bunch. Results reveal that the structure-A (a six-bunch SMA fiber with 8 fibers per bunch) and the structure-B (a one-bunch SMA actuator with 50 fibers per bunch) have similar functions- the bending angle is 158° and the maximum bending torque is 0.155 Nm. Moreover, depending on the patient’s condition, both the maximum swinging angle and the velocity are adjustable by the patient via the PC-based control system. In addition, to avoid damage to the actuator, a maximum operating temperature of 90°C is preset on the SMA.
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How to cite this article:

Yao-Jen Lai, Long-Jyi Yeh and Min-Chie Chiu, 2010. An Assessment of the Body Joint Bending Actuator using a Shape Memory Alloy. Journal of Applied Sciences, 10: 1973-1977.

DOI: 10.3923/jas.2010.1973.1977






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