Thermoelectric Heat Transfer Modeling of Shape Memory Alloy Actuators
سال انتشار: 1393
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 1,036
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شناسه ملی سند علمی:
ISME22_591
تاریخ نمایه سازی: 14 مرداد 1393
چکیده مقاله:
Shape Memory Alloy (SMA) wires used as an actuator, are usually actuated by resistive heating of electrical currents rather than by the surrounding medium. Owing to difficulties in control of electrically-heated SMAs, the thermoelectric heat transfer of SMA wires is undertaken in this paper. First-order convective heating model is used for thin SMA wire which accounts for the latent heat and thermal hysteresis of transformation. The convective heat transfer coefficient, h, is assumed to be a polynomial function of temperature. In addition, heat capacity is defined as a function of both temperature and stress. A one-dimensional constitutive model of Brinson is applied to determine stress in the wire. The electrical heat transfer equation is coupled with the constitutive equation to simulate the constant strain behavior of the SMA wire. Based on this simulation, a simplified model is proposed to predict the temperature response of SMA wire in order to calculate the time response of SMA actuated systems. A series of experiment are performed in which the transient temperature data are recorded for different applied electric current profiles to validate these two models. For different current input profiles, the calculated time response is in good agreement with the experimental data. The developed models may be applied in order to predict the temperature of a current carrying SMA wire without using direct temperature measurement methods.
کلیدواژه ها:
نویسندگان
Hossein Talebi
Shahrekord, University of Shahrekord
Hossein Golestanian
Shahrekord, University of Shahrekord
Mohammad Reza Zakerzadeh
Tehran, University of Tehran
Hadi Homaei
Shahrekord, University of Shahrekord