Exploitation of shape memory alloy actuator using resistance feedback control and its development

Cho, Hiroki; Yamamoto, Takaei; Takeda, Yoichi; Suzuki, Akihiko; Sakuma, Toshio

doi:10.1016/s1002-0071(12)60013-6

Cited by 25 publications

(13 citation statements)

References 17 publications

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“…The resistivity changes with the applied strain during the stress-induced transformation plateau, while small changes are observed during elastic deformation. This behavior confirms that the resistivity of the shape memory alloy (NiTi) is a function of the volume fraction of each phase [ 26 ]. Figure 4 shows that the stress applied is high enough to induce the B2–B19′ transformation, which occurs with an observation of the R phase presence due to a change in the resistivity values measured (blue square in first cycle) [ 27 ].…”

Section: Resultssupporting

confidence: 71%

Experimental Analysis of NiTi Alloy during Strain-Controlled Low-Cycle Fatigue

et al. 2021

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The interaction between the stress-induced martensitic transformation and resistivity behavior of superelastic NiTi shape memory alloy (SMA) was studied. Strain-controlled low-cycle fatigue up to 6% was monitored by in situ electrical resistivity measurements. The experimental results show that a great motion of martensite fronts results in a significant accumulation of defects, as evidenced by transmission electron microscopy (TEM), before and after the tensile cycles. This gives rise to an overall increase of the resistivity values up to the maximum deformation. Therefore, the research suggests that shape memory alloy wire has great potential as a stress sensor inside bulk materials.

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Section: Resultssupporting

confidence: 71%

Experimental Analysis of NiTi Alloy during Strain-Controlled Low-Cycle Fatigue

et al. 2021

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“…The current drive circuits for these actuators cannot control the temperature of the SMA, which could easily overheat. To solve this issue, addition of a resistance-feedback circuit offers a good solution [3]. Figure 8 shows clothes temperature measured just after 5 minutes actuation.…”

Section: Comfort Of the Clothesmentioning

confidence: 99%

Breathing clothes

Ohkubo

Yamamura

Uchiyama

et al. 2014

Proceedings of the 11th Conference on Advances in Computer Entertainment Technology

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Breathing clothes are media artworks formed as an application of the hairlytop interface. The hairlytop interface is an assembly of fine, soft and deformable actuators. Each actuator is composed of a shape memory alloy (SMA) and drive circuits. Various types of sensors can be connected to the driving circuits. The actuators can then deform in reaction to surrounding stimuli, including light, sound, and human activity. The high flexibility of this configuration and its unique motion enables us to compose various interface types, such as furry decorated interfaces and new deformable textiles. In this paper, we describe in detail several types of clothes composed of this unique fabric combined with the hairlytop interface. The clothes act based on the wearer's breathing action, which acts as an indicator of the emotional state of the wearer.

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“…These characteristics leads to the resistance of the SMAs becoming a parameter of the SMAs strain. From these results, authors have proposed and devised an SMA actuator using a resistance feedback control system [11][12] . This resistance feedback system can be controlled, and retained positioning at any required positions without using sensor devices.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Constraint Conditions on the Bending Operating Characteristics of a Weft Yarn-type Shape Memory Alloy Actuator

Saka

Cho

Takeda³

2019

Trans. Mat. Res. Soc. Japan

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For the purpose of developing an actuator for wearable-assistive devices, we have devised and produced a weft yarn-type shape memory alloy (SMA) actuator using the resistance feedback control method. This actuator consists of a polyethylene terephthalate (PET) plate and SMA wire woven into the weft pattern. Since the PET plate and SMA wire are constrained in the lateral direction, this actuator can do the bending operation by the actuation of the SMA wire. In this research, the effects of constraint conditions of the PET plate and SMA wire (i.e. the distance between PET plate and SMA wire (D)), and the number of constraining points (N) were investigated with respect to the bending operating characteristics (bending deflection and operating velocity) of the weft yarn-type SMA actuator. The bending deflection of the actuator was seen to increases with the increase of N. However, the bending deflection of the actuator was seen to decreases with the increase of N beyond the maximum value. The variation of deflection is caused by the variation of frictional force due to the variation of N. Furthermore, the bending deflection of the actuator and operating velocity decrease as D increases. This tendency is caused by the increase of the curvature radius of actuator with the increase of D.

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Exploitation of shape memory alloy actuator using resistance feedback control and its development

Cited by 25 publications

References 17 publications

Experimental Analysis of NiTi Alloy during Strain-Controlled Low-Cycle Fatigue

Experimental Analysis of NiTi Alloy during Strain-Controlled Low-Cycle Fatigue

Breathing clothes

The Effect of Constraint Conditions on the Bending Operating Characteristics of a Weft Yarn-type Shape Memory Alloy Actuator

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