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首页> 外文会议>2002 ASME International Mechanical Engineering Congress and Exposition , Nov 17-22, 2002, New Orleans, Louisiana >THERMO/MECHANICAL DESIGN, MODELING, TESTING OF SHAPE MEMORY ACTUATED MINIMAL MICRO INVASIVE PROBE SYSTEMS
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THERMO/MECHANICAL DESIGN, MODELING, TESTING OF SHAPE MEMORY ACTUATED MINIMAL MICRO INVASIVE PROBE SYSTEMS

机译：形状记忆致动的微创探针系统的热/机械设计，建模和测试

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Small scale probes implementing shape memory alloy (SMA) actuation show great promise in applications requiring remote and minimally invasive access to small environments. Such environments include physiological spaces like those located in human and animal bodies as well as cavities within mechanical systems. Probes examined here are generally snake like in appearance composed of one or multiple independent segments, which in turn are made up of one or multiple SMA actuators performing work against an elastic spine. As the actuator(s) of a given segment are activated, the spine bends causing the probe to bend in the area of that segment. When the actuator(s) are deactivated, the force generated in the bending of the spine returns the segment to its neutral position. Activation and deactivation of actuators is accomplished by heating and cooling respectively, enacting the solid phase changes that are characteristic to the shape memory effect. The gage of control over probe shape depends on the number of independent segments that are available per unit length and the degree of control an operator has over each of the segments. The work presented here discusses the constraints imposed on the design of SMA actuated probes, and how those constraints become more critical and limiting with reduced physical scale and refinement of motion control. Numerical and finite element models have been developed showing the interrelationship between mechanical design, the thermal and phase states of the SMA actuators), and the mechanical performance of the total system. Performance concerns examined include probe shape control and the limits of shape change as a function of physical scale. Comparative data is presented between behavior predicted by the models developed and performance observed during the testing of prototypes. It is concluded that segment length, linked to refinement of probe control, is limited by its thermal boundary conditions.
机译：实施形状记忆合金（SMA）致动的小型探头在需要远程和微创访问小型环境的应用中显示出巨大的希望。这样的环境包括诸如位于人体和动物体内的生理空间以及机械系统内的空腔。此处检查的探头通常是蛇形的，由一个或多个独立的部分组成，这些部分又由一个或多个SMA致动器组成，它们对弹性脊柱执行工作。当激活给定段的执行器时，脊柱弯曲，导致探头在该段区域内弯曲。当停用一个或多个执行器时，在脊柱弯曲中产生的力会使该段返回其中立位置。通过分别加热和冷却来实现致动器的激活和去激活，从而实现形状记忆效应所特有的固相变化。控制探头形状的尺度取决于每单位长度可用的独立段的数量以及操作员对每个段的控制程度。本文介绍的工作讨论了对SMA致动探头的设计施加的约束条件，以及这些约束条件如何变得更加关键并随着减小的物理尺寸和运动控制的改进而受到限制。已经开发了数值和有限元模型，显示了机械设计，SMA执行器的热状态和相状态以及整个系统的机械性能之间的相互关系。所研究的性能问题包括探针形状控制和形状变化的极限，这些变化是物理尺度的函数。在开发的模型预测的行为与原型测试期间观察到的性能之间提供了比较数据。结论是，段长度与探针控制的完善有关，受其热边界条件的限制。

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