【摘要】The volume and weight budgets in missiles and gun-launched munitions have decreased with the military forces' emphasis on soldier-centric systems and rapid deployability. Reduction in the size of control actuation systems employed in today's aerospace vehicles would enhance overall vehicle performance as long as there is no detrimental impact on flight performance. Functional materials such as shape memory alloys (SMA's) offer the opportunity to create compact, solid-state actuation systems for flight applications. A hybrid SMA model was developed for designing micro-actuated flow effectors. It was based on a combination of concepts originally presented by Likhatchev for microstructural modelling and Brinson for modelling of transformation kinetics. The phase diagram for a 0.1 mm SMA wire was created by carrying out tensile tests in a Rheometrics RSA-II solids analyser over a range of temperatures from 30℃ to 130℃. The characterization parameters were used in the hybrid model to predict the displacement-time trajectories for the wire. Experimental measurements were made for a SMA wire that was subjected to a constant 150 g load and short, intense 4.5 to 10 V pulses. Actuation frequency was limited by the cooling rate rather than the heating rate. A second set of experiments studied the performance of SMA wires in an antagonistic micro-actuator set-up. A series of 2 or 3 V step inputs were alternately injected into each wire to characterize the peak to peak displacement and the motion time constant. A maximum frequency of 0.25 Hz was observed. An antagonistic actuator model based on the hybrid SMA model predicted reasonably well the displacement-time results.
【摘要机译】随着军队对以士兵为中心的系统和快速部署能力的重视，导弹和枪支弹药的体积和重量预算有所减少。只要不对飞行性能产生不利影响，减小当今航空航天飞机中使用的控制致动系统的尺寸将提高总体车辆性能。诸如形状记忆合金（SMA's）之类的功能材料提供了为飞行应用创建紧凑的固态致动系统的机会。开发了一种用于设计微动流效应器的混合SMA模型。它基于Likhatchev最初提出的用于微观结构建模和Brinson提出的用于转换动力学建模的概念的组合。通过在Rheometrics RSA-II固体分析仪中在30℃至130℃的温度范围内进行拉伸测试，可以生成0.1 mm SMA线材的相图。在混合模型中使用表征参数来预测导线的位移时间轨迹。对SMA线进行了实验测量，该线承受了150 g的恒定负载和4.5至10 V的短而强烈的脉冲。致动频率受冷却速率而非加热速率的限制。第二组实验研究了SMA微丝在拮抗微执行器装置中的性能。一系列2或3 V阶跃输入交替注入每根导线，以表征峰到峰位移和运动时间常数。观察到最大频率为0.25 Hz。基于混合SMA模型的对抗执行器模型可以很好地预测位移时间结果。
机译形状记忆合金的混合微观宏观 - 机械本构模型