Design Method for Constant Force Components Based on Superelastic SMA

Wang, Minghui; Yu, Hongliu; Shi, Ping; Meng, Qiaoling

doi:10.3390/ma12182842

Cited by 2 publications

(3 citation statements)

References 20 publications

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“…Since both ξ A and ξ DM are functions of temperature and stress, ρ 0 is the function of temperature T and stress σ, too. Combining with the phase transformation equation of the constitutive model from Equations (1)- (6), the relation between ρ 0 , T and σ can be obtained. A numerical simulation of the resistivity of SMA was carried out.…”

Section: Resistance Characteristic Modelmentioning

confidence: 99%

“…As the actuators based on SMA have the advantages of simple structure, small size, light quality, and low cost, the SMA is increasingly used in different fields [2]. For example, advanced SMA-based devices have been designed to improve the aerodynamic performance of vehicles [3], to actuate light grippers and reusable non-explosive lock release mechanisms [4,5], and to generate constant force components [6], etc.…”

Section: Introductionmentioning

confidence: 99%

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Resistance Characteristics of SMA Actuator Based on the Variable Speed Phase Transformation Constitutive Model

Zhang

et al. 2020

Materials

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The shape memory alloy (SMA)-based actuators have been increasingly used in different domains, such as automotive, aerospace, robotic and biomedical applications, for their unique properties. However, the precision control of such SMA-based actuators is still a problem. Most traditional control methods use the force/displacement signals of the actuator as feedback signals, which may increase the volume and weight of the entire system due to the additional force/displacement sensors. The resistance of the SMA, as an inherent property of the actuator, is a dependent variable which varies in accordance with its macroscopic strain or stress. It can be obtained by the voltage and the current imposed on the SMA with no additional measuring devices. Therefore, using the resistance of the SMA as feedback in the closed-loop control is quite promising for lightweight SMA-driven systems. This paper investigates the resistance characteristics of the SMA actuator in its actuation process. Three factors, i.e., the resistivity, the length, and the cross-sectional area, which affect the change of resistance were analyzed. The mechanical and electrical parameters of SMA were obtained using experiments. Numerical simulations were performed by using the resistance characteristic model. The simulation results reveal the change rules of the resistance corresponding to the strain of SMA and demonstrate the possibility of using the resistance for feedback control of SMA.

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Section: Resistance Characteristic Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Resistance Characteristics of SMA Actuator Based on the Variable Speed Phase Transformation Constitutive Model

Zhang

et al. 2020

Materials

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show abstract

“…Hence, engineers and researchers across the globe show high interest in the unique properties of SMA, especially regarding developed thermomechanical energy, which it provides at a lower cost. Therefore, further innovations, designs, and systems have been proposed to integrate SMA as a smart actuation source [ 19 , 20 ]. Integrating the SMA within certain disciplines, such as robotic and biomedical, allows for further simplification on the design for SMA-based systems, in which it reduces the system’s volume and weight significantly, offering compact structures and systems [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

Thermal–Optical Evaluation of an Optimized Trough Solar Concentrator for an Advanced Solar-Tracking Application Using Shape Memory Alloy

et al. 2022

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One of the modern methods for enhancing the efficiency of photovoltaic (PV) systems is implementing a solar tracking mechanism in order to redirect PV modules toward the sun throughout the day. However, the use of solar trackers increases the system’s electrical consumption, hindering its net generated energy. In this study, a novel self-tracking solar-driven PV system is proposed. The smart solar-driven thermomechanical actuator takes advantage of a solar heat collector (SHC) device, in the form of a parabolic trough solar concentrator (PTC), and smart shape memory alloy (SMA) to produce effective mechanical energy for solar tracking applications from sun rays. Furthermore, a thermal–optical analysis is presented to evaluate the performance of the solar concentrator for the simulated weather condition of Dammam City, Saudi Arabia. The numerical results of the thermal and optical analyses show the promising feasibility of the proposed system in which SMA springs with an activation temperature between 31.09 °C and 45.15 °C can be utilized for the self-tracking operations. The work presented adds to the body of knowledge an advanced SMA-based SHC device for solar-based self-actuation systems, which enables further expansions within modern and advanced solar thermal applications.

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Design Method for Constant Force Components Based on Superelastic SMA

Cited by 2 publications

References 20 publications

Resistance Characteristics of SMA Actuator Based on the Variable Speed Phase Transformation Constitutive Model

Resistance Characteristics of SMA Actuator Based on the Variable Speed Phase Transformation Constitutive Model

Thermal–Optical Evaluation of an Optimized Trough Solar Concentrator for an Advanced Solar-Tracking Application Using Shape Memory Alloy

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