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A shape memory alloy–based soft morphing actuator capable of pure twisting motion
Rodrigue, Hugo,Bhandari, Binayak,Han, Min-Woo,Ahn, Sung-Hoon SAGE Publications 2015 Journal of intelligent material systems and struct Vol.26 No.9
<P>This article introduces a novel design for a soft morphing actuator capable of pure twisting motion through a pair of shape memory alloy wires embedded in a polydimethylsiloxane matrix at constant and opposite eccentricity across the cross section in opposite directions. This report introduces the design of the actuator, the manufacturing method, and experimental results for the twisting angle and twisting force when varying the dimensions of the matrix of the actuator. Afterward, a simple model is applied to verify the effect of matrix dimensions on the twisting angle of the actuator. The results show that there is an optimal actuator thickness for both the twisting angle and the twisting force of the actuator, that there is a trade-off between the twisting angle and the twisting force for the actuator's thickness, and that a longer length is better for both metrics within the tested dimensions.</P>
Film-based anisotropic balloon inflatable bending actuator
정주철,RODRIGUEHUGO 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.9
Most soft pneumatic actuators require large pressures to realize their full deformations, have a non-negligible weight from their polymeric structures and have limited bending angles. In this work, a new soft pneumatic actuator utilizing anisotropic expansion of a pocket made from two different films is presented. This actuator is capable of bending angles of 500° while weighing less than 3 g and requiring less than 3 kPa to produce its maximum bending angle. It was also shown that the actuator can produce helical deformations by simply varying the angle of the bonded lines of the actuator. The effect of its most important geometric parameters as well as the application to two types of grippers is presented that can gently but firmly grasp objects or wrap themselves around structures.
공압 기반의 팽창식 비틀림 소프트 스프링 액추에이터 설계 및 성능
장재혁,김지훈,장성원,RODRIGUEHUGO 한국정밀공학회 2022 한국정밀공학회지 Vol.39 No.11
The soft robotics field, known to have actuators and systems with a simple manufacturing process, being lightweight and safe to interact with humans, is in constant expansion. Present actuators have excessive unwanted deformations, which greatly affects the system's performance by enlarging the external dimensions of the soft robot, reducing its efficiency, and causing unexpected or harmful contact with its surrounding environment. Thus, this work presented an actuator with a spring-like structure within a pneumatic chamber able to contract based on its innate design and lengthen when hyperatmospheric pressures are applied, resulting in tension and torsion. A tensile testing machine and a force-torque sensor coupled with the actuator were used to evaluate its performance for different initial lengths, pressure inputs, and number of coils. At 30 kPa, a torque of up to 5 Nm was generated, have a maximum torsional angle of 41 degrees, and expanded 700% of its original length. Results have shown that the studied pneumatic-based expanding torsional soft spring actuator can stably lengthen under pneumatic pressure, resulting in sufficient force and considerable torque, and could be considered in future applications.
추원식,안성훈,김민수,장기환,송지현,RODRIGUEHUGO,천두만,조영태,고승환,조규진,차석원,민상기,정성호,정해도,이춘만,추종남 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.3 No.2
Manufacturing paradigms have historically been shaped by social, economic, and technological aspect, including limitations and needs. Design for manufacturing (DFM) has been the main paradigm for last three decades since design is defined by the limitations of available manufacturing processes. Since reducing the time required for the development of new products has been one of the key issues for businesses, removing the gap between designers and manufacturers has been one of today’s main goals. Many methods were developed to reduce this gap including information and communication technologies (ICT). However, current issues have been shifting towards design-related issues such that researchers have been trying to make products desired by the customers rather than that which is cheaper to manufacture. In this article, hybrid manufacturing (HM) and the concept of smart factory are introduced as key technologies for the future paradigm of manufacturing: Manufacturing for Design (MFD). Issues related to the development of HM process and examples of HM process are explained, and the importance of smart factories for the implementation of MFD is shown. Finally, future trends of HM and smart factory are predicted at the end of this article.