An Experimental Investigation of the Feasibility of "Self-Sensing" Shape Memory Alloy Based Actuators  

Oleh:

Malukhin, K. ; Ehmann, K. F.

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Journal of Manufacturing Science and Engineering vol. 130 no. 3 (Jun. 2008), page 031109.
Topik: An Experimental Investigation; Self Sensing; Shape Memory Alloy; Actuators

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ93.11 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

Lihat Detail Induk

Isi artikel

Shape memory alloys (SMAs) change their crystallographic structure and shae during heating/cooling and, as a consequence, their electrical resistance also changes. This allows the determination of the location of a SMA-bases structure in space without separate sensors by suitably measuring this change. In this paper, this "self-sensing" concept is explored in SMA wire-type actuators. Step responses, expressed int erms of resistance (voltage drop) across the wire, and the corresponding displacement changes during heating/cooling, wre measured. It was shown that the realitonship between the displacement and the voltage drop can be approximated by a linear regression with a correlation coefficient close to 1. System identification has shown that SMA wire actuator performance can be best approximated by first or by second order system response depending on the thermal insulation condition of the actuator. The resolution and the sensitivity of the self-sensing method were evaluated bases on experimantal data and it was shown that their minimal values were less than 1.7 (miu)m and 0.7 (miu)m, respectively, thus supproting the feasibility of the "self-sensing concept." Both values exsponentially increase with the increase in the range of the measured displacements whose magnitudes vary under different working conditions.

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