Papers by Keyword: Shape Memory Alloy Actuator

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Authors: Xin Li, Lu Fei Zhou, Ming Di Wang, Kang Min Zhong
Abstract: Shape Memory Alloys (SMA) is mainly used in Microsystems because of its micro strain. A new kind of clamping device based on area effect stroke amplifier and driven by SMA wires is introduced in this paper. With the micro strain enlarged by stroke amplifier and pressure transmitted via closed pipeline, a greater displacement can be obtained to clamp the workpiece. This clamping device has prominent advantages in great stroke amplifying ratio and green aspect. Moreover, remote clamping and automatic control are easy to implement because of the high flexibility of fluid.
Authors: Petr Šittner, J. Pilch, P. Lukas, Michal Landa, H. Seiner, P. Sedlak, B. Malard, Ludek Heller
Abstract: In order to better understand the unique functional responses of shape memory alloys, improve the currently existing SMA modeling tools and used them beneficially in smart structure applications, it is desirable to investigate the deformation/transformation processes in these materials in action – i.e. under stress and temperature variation. In this work, an overview is presented on the applications of various recently developed or originally employed in-situ experimental methods and approaches to martensitic transformations in SMAs.
Authors: Emily Leylek, Justin Manzo, Ephrahim Garcia
Abstract: A bat-like aircraft is proposed, using a smart joint mechanism to actuate the morphing of the wings. The smart joint stays in its deformed shape after cooling, which can be up to 5% of 25 mm length joint. The morphing of the wing shapes of three different bat species is evaluated using a planar lifting line analysis. The morphing improves the lift coefficient over 1000% and the lift to drag ratio over 300% at an angle of attack of 0.6°. The results compare well with what is expected from the type of flight and morphology that has been documented for the bats.
Authors: Zhen Long Wang, Fei Gao, Yu Kui Wang, Cheng Guo
Abstract: Inspired by the squid’s funnel which can bend flexibly, a kind of biomimetic squid funnel actuated by shape memory alloy (SMA) wires was developed for controlling the jet direction in this article. With the application of Pulse Width Modulation (PWM) technique, experimental investigation was conducted. And the results show that, the bending angle of the biomimetic squid funnel can be controlled by changing PWM duty cycle and the final stable resistance of SMA wire decreases while the duty cycle is increased. The relationship between the banding angle of the biomimetic squid funnel and the resistance of SMA wire is approximately inverse linear. The feasibility of jet direction control with the biomimetic squid funnel was verified by a simulated jetting experiment.
Authors: G. Ahmed, B.L. Ahuja, N.L. Heda, Vinit Sharma, A. Rathor, B.K. Sharma, M. Itou, Y. Sakurai, Soma Banik
Abstract: We present the first ever theoretical and experimental charge Compton profiles of Ni2MnGa Heusler alloy. The measurements have been made using magnetic Compton spectrometer at SPring8, Japan. The Compton profiles and energy bands have been computed using Hartree-Fock, density functional theory with local density and generalized gradient approximations. It is seen that the Hartree-Fock based Compton profile is relatively in better agreement with the experimental profiles. In addition, we also report the energy bands, density of states and valence charge densities using full potential linearized augmented plane-wave method.
Authors: Wei Guo Li, Xiang He Peng, Wen Li Pi
Abstract: An incremental form of constitutive model is proposed for shape memory alloys using the modified strain based on experimental results and the finite element analysis, taking into account of the laminar microstructure, the thickness of martensite phase lamina and the interaction between the two phases. The pseudoelastisity of NiTi shape memory alloy micro-tube subjected to pure tension and pure torsion are analyzed and compared with the experimental results respectively. It can be seen that the pseudoelastic behavior, especially the stress drop during tension processes, can be well described with the proposed model.
Authors: Jiang Yuan, Yu Tian Chen, Zi Xue Qiu, Xing Tian Yao, Jing Ya Wu
Abstract: In order to achieve the real-time monitoring internal state of composite specimen embedded shape memory alloy wires, a new wireless monitoring method in which PS021 is used to measure the capacitance change of composite structure is proposed. The micro-capacitance measuring principle of PS021 and the design of hardware and software of system are introduced in detail. The capacitance signal between some two wires of composite structure embedded SMA is measured by the PS021 module, and the measurement data are processed by C8051F330 micro-controller and wirelessly sent to PC by PTR4000. Compared the tested results with that of the high precision LCR meter, experimental results show that the relative error of system is less than 4.5%.
Authors: Ai Rong Liu, Qi Cai Yu, Yuan Yao, Yu Zhu Guo
Abstract: This paper investigated the superelasticity and hysteresis characteristics of TiNi shape memory alloy ( SMA ) wire at room temperature, then the mechanical parameters of which were obtained. Based on the TiNi SMA wire and a purchased viscous damper, a new type of hybrid-passive-damper was designed and developed. Experiments were performed in order to validate the relationship of loading frequency and characteristic parameters such as energy dissipation capacity, equivalent damping ratio and equivalent stiffness. Experimental results show that hybrid-passive-damper designed in this paper has excellent energy dissipation capacity and is suitable for the vibration control of structures with long vibration period.
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