Abstract

This paper aims at finding an optimal design of a shape memory alloy (SMA) actuator that guarantees a required reliability level under uncertainties parameters. The SMA actuator is composed of two NiTi membranes which, at room temperature, are in a martensitic state. They have an initial at shape and are bonded together with an intermediate spacer. The motion of the actuator is caused by the heating or cooling of its membranes. This paper proposes a methodology to find the best adjustment between cost and safety. Accordingly, several methods are developed, such as the hybrid method (HM) and the robust HM (RHM) to reach this purpose. The objective of this work is to present an extension of these methods in case of the SMA material. In fact, in this case, these methods may lead to an infeasible solution. Then, a method called improved RHM (IRHM) is proposed to overcome the difficulties of other ones. The obtained results showed the effectiveness and efficiency of the IRHM for treating the reliability-based design optimization problem of the SMA actuator.

摘要

本文旨在找到一种形状记忆合金（SMA）执行器的最佳设计，该设计可在不确定性参数下保证所需的可靠性。SMA执行器由两个NiTi膜组成，它们在室温下处于马氏体状态。它们具有初始形状，并通过中间垫片粘结在一起。致动器的运动是由其膜的加热或冷却引起的。本文提出了一种在成本和安全性之间寻求最佳调整的方法。因此，开发了几种方法，例如混合方法（HM）和鲁棒HM（RHM）以达到此目的。这项工作的目的是在SMA材料的情况下扩展这些方法。实际上，在这种情况下，这些方法可能导致不可行的解决方案。然后，为了克服其他方法的困难，提出了一种称为改进的RHM（IRHM）的方法。获得的结果表明，IRHM处理SMA执行器基于可靠性的设计优化问题的有效性和效率。