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研究了形状记忆合金线的热电行为。当合金线被加热到温度高于其相变温度时,由于相的转变而产生一个大的机械力。将SMA线用作驱动器,并研究了不同的参数及它们之间的关系。在不同的压力水平下,这些变化的参数分别是弹性应变(位移)、温度磁滞和电阻。通过传递热模型得到安全的加热电流并预测了相变温度。在自然空气对流的条件下,采用680 mA的电流加热、冷却合金线796 s。在43 MPa的应力水平下,应变恢复率为4.33%,相应的电阻变化为11.2%。在加热、冷却循环过程中,电阻变化与位移和电流分别呈线性关系。该研究有助于精确控制有、无外部传感器反馈的SMA线驱动器。
The thermoelectric behavior of shape memory alloy wire was studied. When the alloy wire is heated to a temperature higher than its phase transition temperature, a large mechanical force is generated due to the phase transition. The SMA wire was used as a driver and the different parameters and the relationship between them were studied. At different stress levels, the parameters of these changes are elastic strain (displacement), temperature hysteresis, and resistance, respectively. By transferring the thermal model to obtain a safe heating current and predict the phase transition temperature. Under natural convection conditions, a current of 680 mA was applied to cool the alloy wire for 796 s. At the stress level of 43 MPa, the strain recovery rate was 4.33% and the corresponding resistance change was 11.2%. During the heating and cooling cycles, the resistance changes linearly with the displacement and the current, respectively. This study helps to precisely control SMA line drivers with and without external sensor feedback.