A novel design of a parallel gripper actuated by a large-stroke shape memory alloy actuator

Lu, Yaojuan; Xie, Zhijie; Wang, Jian; Yue, Honghao; Wu, Miao; Liu, Yiwei

doi:10.1016/j.ijmecsci.2019.05.041

Cited by 65 publications

(30 citation statements)

References 15 publications

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“…In practical application, the force and displacement output by SMA wire are important parameters. Different loads and operating conditions both have an impact on driving ability [15]. In order to test the output performance of the SMA wire driver under different conditions, designing a multifunctional SMA wire driver testing system.…”

Section: Sma Wire Testmentioning

confidence: 99%

A reusable SMA actuated non-explosive lock-release mechanism for space application

Pan

Zhang

et al. 2020

International Journal of Smart and Nano Materials

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After the satellite is launched with the carrier rocket, it is necessary to separate the satellite from the rocket at an appropriate time to ensure that the satellite enters the intended orbit. In this process, it is vital to ensure a reliable connection and accurate separation. With the increasing use of microsatellite in orbit, the contradiction between the shock of separation and the requirement of the platform's dynamic environment is becoming increasingly prominent. Therefore, the traditional pyrotechnic separation device can no longer meet the requirements. This paper presents a reusable non-explosive release actuator using shape memory alloy (SMA) wire for high load and low shock. The system is based on the Fast Acting Shock-less Separation Nut (FASSN) technology. Using the shape memory effect of SMA, a biased SMA wire trigger has been developed, which is used as the driver source of the actuator. At the moment of receiving the electrical signal, the SMA wire generates stress and deformation. The trigger set free the constraints on the mechanical components, and the target is released. Experimental results indicate that the trigger device can unlock successfully and well meet the technical objectives.

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Section: Sma Wire Testmentioning

confidence: 99%

A reusable SMA actuated non-explosive lock-release mechanism for space application

Pan

Zhang

et al. 2020

International Journal of Smart and Nano Materials

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“…Using (6) as objective function, the optimal design of the actuator is achieved by means of the following procedure:…”

Section: Design Optimizationmentioning

confidence: 99%

Validation and optimization of a compact push-pull rubber actuator energized by an outer coil of shape memory wire

Dragoni

Mammano

2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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The authors have formerly published the analytical model and finite element validation of a push-pull actuator made by winding a thin shape memory wire on a solid rubber cylinder. The cylinder provides elastic backup for the wire upon cooling down and transforms its circumferential contraction into a magnified axial elongation upon heating up. Building on that study, this paper accomplishes three tasks: (1) build prototype actuators and perform simple tests to validate the theory; (2) develop simple procedures for the optimal design of the actuator starting from high-level engineering specifications; (3) envision how the present concept could be improved by replacing the rubber block with a compliant lattice-like or shell-like scaffold with designed properties to further enhance the axial stroke.

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“…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%

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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A novel design of a parallel gripper actuated by a large-stroke shape memory alloy actuator

Cited by 65 publications

References 15 publications

A reusable SMA actuated non-explosive lock-release mechanism for space application

A reusable SMA actuated non-explosive lock-release mechanism for space application

Validation and optimization of a compact push-pull rubber actuator energized by an outer coil of shape memory wire

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

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