The Development of Wrist Rehabilitation Assistive Devices Using a Shape Memory Alloy

2013 ◽  
Vol 740 ◽  
pp. 408-415 ◽  
Author(s):  
Min Chie Chiu ◽  
Long Jyi Yeh ◽  
Tz Chi Hung
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Experimental Work ◽  
Driving Force ◽  
Electrical Circuit ◽  
Assistive Devices ◽  
New Type ◽  
Bending Mechanism ◽  
Rehabilitation Devices ◽  
Wrist Splint

For the purpose of wrist rehabilitation, a new type of SMA (Shape memory alloy) wrist rehabilitation device is developed. The palm will be actuated/lifted by the SMA’s driving force when the shape memory alloy is heated up. Four wires of the shape memory alloy (SMA-Ti50Ni45Cu5 with 1.0mm in ψ) are bundled and passed through a fixed plastic block. The whole set of the SMA wrist rehabilitation devices can give support to the palm’s bending mechanism. A 500(g) adult palm is presented in the experimental work. In order to actuate/lift the palm at a sufficient rehabilitation angle, an electrical circuit of 10(A) is adopted. Consequently, the issue, here, is to present a new type of SMA wrist splint that is used to provide a specified rehabilitation angle for the wrist.

Research on Walking Mechanism Base on Biological Metal Fibre

2013 ◽  
Vol 785-786 ◽  
pp. 1267-1272
Author(s):  
Shi Ju E ◽  
Xuan Zhong Ding
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Trajectory Planning ◽  
New Type ◽  
Simulation Results ◽  
Metal Fibre ◽  
Walking Mechanism

A new walking mechanism base on biological metal fibre is study in the paper. It used a new type of shape memory alloy (biological metal fibre, BMF) as actuator. The multilegged walking mechanism is employ and study. Its mobile mechanism and trajectory planning is analysed so as to achieve miniaturization goals. The simulation results showed that the multilegged walking mechanism could be effectively driven by the actuator base on BMF.

1914 New type stents using shape memory alloy

2005 ◽  
Vol 2005.1 (0) ◽  
pp. 481-482
Author(s):  
Kiyoshi YAMAUCHI ◽  
Yuji SUTOU ◽  
Takamitu TAKAGI ◽  
Toshio SAKUMA
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
New Type

Processing of Single-Stage Bellows of TiNi Shape Memory Alloy Using Rubber Bulge Method

2005 ◽  
Vol 475-479 ◽  
pp. 2059-2062 ◽  
Author(s):  
Hiromasa Semba ◽  
Nagatoshi Okabe ◽  
Toru Yamaji ◽  
Keisuke Okita ◽  
Kiyoshi Yamauchi
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Cold Working ◽  
Large Strain ◽  
Longitudinal Direction ◽  
Single Stage ◽  
Damping Characteristics ◽  
Annealing Conditions ◽  
New Type ◽  
Typical Shape

The bellows formed of TiNi shape memory alloy is proposed as a new type of seismic protection device. The bellows structure is known to have lower rigidity along the longitudinal direction through effect of its shape. On the other hand, TiNi is known to be one of the most typical shape memory alloys, which have high damping characteristics for dynamics engaged in its twin formation under martensite state and have the ability to recover completely from the large strain (even such as 8%) after unloaded and or heated. This paper describes a processing method of a single-stage bellows of TiNi shape memory alloy using rubber bulge method. Thin-walled TiNi tubes subjected to cold working were prepared. Several annealing conditions for the process were examined and the appropriate one was discussed. Then the rubber bulge method of displacement control was introduced. Finally, the procedure of the process including heat treatment was clarified.

Dynamics of Phase Fronts During High-Driving-Force Transformation of Shape Memory Alloy Wires

2021 ◽  
Author(s):  
Asaf Dana ◽  
Hiroshi Sekiguchi ◽  
Koki Aoyama ◽  
Eilon Faran ◽  
Klaus-Dieter Liss ◽  
...  
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Driving Force ◽  
Force Transformation

Research on novel shape memory alloy multi-fingered humanoid hand

2007 ◽  
Vol 221 (9) ◽  
pp. 1131-1140 ◽  
Author(s):  
K Yang ◽  
C L Gu
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Structural Parameters ◽  
Human Beings ◽  
Statistical Research ◽  
Offset Distance ◽  
Maximum Angle ◽  
Output Force ◽  
New Type ◽  
Humanoid Hand

Two new type actuators named planar bending embedded shape memory alloy actuator (ESMAA) and spacial bending ESMAA were presented. Using shape memory effect of SMA wires and elasticity of room temperature vulcanization silicone rubber, the ESMAAs could output force and bend displacement steadily. Furthermore, a novel three-fingered humanoid robot hand consisting of six ESMAAs was developed first. The structural parameters of the actuators, such as rod's radius, wire's radius, wire's recoverable curvature, and offset distance were optimized by combining analytical model with experimental results. On the basis of bionics, the lengths of hand's knuckles were determined through statistical research on the configuration of human beings' hands. The locations of fingers were carefully chosen through a volume optimal index. It is shown in the experiments that maximum angle between ends' tangents of each finger are 68.5°, 79°, and 79°, respectively. The tip of each finger could reach its final position approximately at the same time and by controlling the bending of each finger, the hand could accomplish fine manipulation like that of a human being.

Investigation of a shape memory alloy releasable mechanism applied in space environment

2020 ◽  
Vol 64 (1-4) ◽  
pp. 393-401
Author(s):  
Kan Bian ◽  
Chunhua Zhou ◽  
Fagang Zhao ◽  
Yipeng Wu ◽  
Ke Xiong
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Response Speed ◽  
Space Environment ◽  
Maintenance Cost ◽  
Heating Efficiency ◽  
Output Force ◽  
Maximal Output ◽  
New Type ◽  
Sma Spring

Though the conventional pyrotechnic fastener mechanisms are widely used in spacecraft for their reliable releasable-fastening function, they still have several unavoidable problems: physical shock, high maintenance cost, to name a few. This paper introduces a new type of smart releasable mechanism based on a Shape Memory Alloy (SMA) spring and its corresponding heating apparatus. To obtain the high heating efficiency and increase the response speed, the SMA spring is transitionally fit with the heating apparatus shell instead of directly heating by electric current. As soon as the heating apparatus begins to work, the SMA spring will provide an un-locking force to release the fastening device within the standard time, which also realizes the similar releasable-fastening function comparing with the conventional pyrotechnic fastener mechanisms. In order to ensure the reliability of space products, the heating apparatus is composed of two identical ceramic heating elements which can be controlled independently or synchronously. Finally, the experimental results clearly show that, under the satellite power supply at the constant value of 28 V, the SMA spring can reach the desired 30 N unlocking force within 93 s and 51 s by single or dual heating elements, respectively. The maximal output force can even be increased as large as 40 N under the limited volume of the releasable mechanism.

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