Controlling the Stroke of Shape Memory Actuator Wires

Gheorghita, V.; Guempel, P.; Cerón, Alejandro; Strittmatter, Joachim

doi:10.2507/daaam.scibook.2011.46

Cited by 1 publication

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“…The experimental setup on the horizontal axis has been preferred since it is easy to observe the experiment while running. This kind of SMA wires have the stroke from 3% up to 8% of their lengths, dependently on the load (Gheorghita et al, 2011; Mertmann and Vergani, 2008; Mohd Jani et al, 2017; Yang et al, 2019). The wire is contracted approximately 5% of its length.…”

Section: Experimental Setup and Characterization Proceduresmentioning

confidence: 99%

Estimation of heat transfer model parameters by using recursive least square (RLS) method for a shape memory alloy wire

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2022

Journal of Intelligent Material Systems and Structures

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The thermal model of shape memory alloy (SMA) wires is improved by identifying the convectional heat transfer model (htm) parameters. Recursive Least Square (RLS) Method is used to estimate heat transfer coefficient, specific heat and latent heat coefficient. The parameters are estimated altogether with the surface area, volume and density of the wire. Also, after measuring the resistance by using multimeter, the value of each parameter was separately determined. Heat transfer coefficient is ambient dependent and dominant in the heat transfer model. The estimation of heat transfer coefficient is important and this is shown in this study. The proposed method builds an improved heat transfer model for SMA wire by using a single set of experimental data. Performance of the estimation with RLS is validated by using the measured data. It is shown that heat convection coefficient can be estimated with high accuracy. Thus, it is revealed that addition of the latent heat term during phase transformation into the model resulted in a more accurate model. The accuracy of the model can be enhanced by 28% by the addition of latent heat term.

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