| This paper deals with the L 2 stability of a shape memory alloy (SMA) actuated position control system , based on a single SMA wire under constant axial load. It is shown that system stability can be guaranteed for a large class of controllers having certain dissipativity characteristics. In particular, the results can be used to show stability under approximated PID, PI and PD control. Exper...

This paper explores the effectiveness of shape memory alloy (SMA)/rubber-based isolation systems for seismic protection of bridges against near-field earthquakes by performing a sensitivity analysis. The isolation system considered in this study consists of a laminated rubber bearing, which provides lateral flexibility while supplying high vertical load-carrying capacity and an auxiliary device...

PURPOSE Vessel damage after clamping may affect the success of surgical operations. A new pressure controlled clamp (SMA clamp) was designed using super elastic property of shape memory alloy (SMA) to realize atraumatic vessel occlusion. The ability and biological effect of the SMA clamp to control pressure was investigated in vivo. METHODS The loading-displacement curves of the SMA clamps (e...

Abstract Nickel Titanium Naval Ordinance Laboratory (NiTiNOL) is widely called as a shape memory alloy (SMA), class of nonlinear smart material inherited with the functionally programmed property varying electrical resistance during transformation enabling to be positioned sensing element. The major challenge instrument SMA wires suppress wires’ nonlinearity by proper selection two important fa...

Abstract The use of Shape Memory Alloy (SMA) recently increased in smart structures. It is essential to investigate the impact viscoelastic material, and transformation temperatures SMA on dynamic behavior, especially damping capability reinforced composite. In this paper, constants material are evaluated experimentally, a model based experimental results proposed for effect wires combination s...

A process for fabrication of shape memory alloy MEMS actuators on a elastomeric polymer substrate is described. These actuators are designed for use on innovative soft body robots. Patterned shape memory alloy (nitinol) is sputter deposited on a polyimide mesh structure. The mesh substrate acts as a bias spring to de-twin the shape memory alloy in the martensite phase. Significant portions of t...

− A new type of actuator is presented where Shape Memory Alloy (SMA) wires are embedded within artificial “blood vessels.” Fluid flowing through vessels allows the SMA wires to be rapidly cooled by convection, resulting in greater bandwidth than ordinarily possible. Combinations of electric, fluidic, and thermal inputs can be used to control the contraction/extension of the SMA wires within the...

Shape memory alloy (SMA) actuators can be made very compact and simple. An effective control algorithm is an integral part of every SMA actuator. This article presents a review of the state of the art research on control of SMA systems. It is worth noting that almost exclusively all control systems applied to SMA actuators are not model-based control algorithms. In other words, the control syst...

As a new type of smart material, magnetic shape memory alloy has the advantages of a fast response frequency and outstanding strain capability in the field of microdrive and microposition actuators. The hysteresis nonlinearity in magnetic shape memory alloy actuators, however, limits system performance and further application. Here we propose a feedforward-feedback hybrid control method to impr...