Journal of rehabilitation welfare engineering & assistive technology (재활복지공학회논문지)

Rehabilitation Engineering And Assistive Technology Society of Korea (한국재활복지공학회)
권호 표지
DOI QR코드

DOI QR Code

Analysis of Heat Transfer Characteristics of Metal-Hydride Module for the Actuation of a Rehabilitative System

재활시스템 구동용 수소저장합금 모듈의 열전달 특성 비교 분석

  • 김경 (충북도립대학 의료전자기기과) ;
  • 김성현 (충북도립대학 의료전자기기과)
  • Received : 2017.04.30
  • Accepted : 2017.05.27
  • Published : 2017.05.31
Download PDF
⟨ Previous Next ⟩

Abstract

We suggested the novel actuator mechanism to apply to wearable assistive system for the improvement of quality of life of the elderly or the people with disability using it. Characteristics of metal-hydride (MH) actuator is investigated in the novel actuating concept. The hydrogen equilibrium pressure increases when hydrogen is desorbed by heating a SMH alloys, whereas by cooling that alloys, the hydrogen equilibrium pressure decreases and hydrogen is absorbed. However, there are too long times in heat transfer mechanism to apply the assistive and rehabilitative device. In this study, 3 different SMH module were designed and characteristics of heat transfer in each SMH module were investigated based on the heat simulation.

고령자 및 장애인의 삶의 질을 높이기 위하여 일상생활동작을 보조하는 경량의 재활보조 시스템이 필요하다. 본 논문에서는 수소저장합금 모듈 3가지를 설계하였고, 열전달 해석을 통하여 수소저장합금 엑츄에이터의 성능을 높일 수 있는 수소저장합금 모듈을 선정하였다. 수소저장합금 엑츄에이터는 열전소자의 열전달을 통하여 수소저장합금 모듈 안에 담겨 있는 수소의 흡수/방출을 통하여 공압 엑츄에이터의 기계적인 동작을 구동시킨다. 수소저장합금 모듈의 열전달의 효과를 검증하기 위하여, 열전소자와 수소저장합금 모듈의 접촉 방식을 선접촉과 면접촉 방식의 3가지 타입으로 3D 모델을 설계하였고, 열전달 해석을 통하여 열전달에 대한 특성을 비교하였다. 그 결과, 열전소자와의 열전달 방식이 선접촉 방식과 비교하여 면접촉 방식의 수소저장합금 모듈이 열전달 특성이 4.4배 좋아지는 것을 확인하였다. 면접촉 방식의 수소저장합금 모듈은 재활보조 시스템의 착용성을 높일 수 있는 수소저장합금 엑츄에이터 개발에 적용될 수 있을 거라 판단된다.

Keywords

References

  1. S. Shimizu, S. Ino, M. Sato, T. Odagawa, T. Izumi, M. Takahashi, and T. Ifukube, "A Basic Study of a Force Display using a Metal Hydride Actuator," Proceedings of 2nd IEEE International Workshop on Robot and Human Communication, 1993.
  2. S. Shimizu, S. Ino, M. Sato, T. Izumi, T. Ifukube, M. Muro, H. Takeda, and Y. Wakisaka, "A New Method of Variable Compliance for a Force Display System Using a Metal Hydride Actuator," Proceedings of 3rd IEEE International Workshop on Robot and Human Communication, 1994.
  3. Y. Wakisaka, M. Muro, T. Kabutomori, H. Takeda, S. Shimizu, S. Ino, and T. Ifukube, "Application of Hydrogen Absorbing Alloys to Medical and Rehabilitation Equipment," IEEE Transactions on Rehabilitation Engineering, vol. 5, no. 2, pp. 148-157, 1997. https://doi.org/10.1109/86.593282
  4. T. Tsuruga, S. Ino, T. Ifukube, M. Sato, T. Tanaka, T. Izumi, and M. Muro, "A Basic Study for a Robotic Transfer Aid System Based on Human Motion Analysis," Advanced Robotics, vol. 14, no. 7, pp. 579-595, 2000.
  5. S. Ino, M. Hosono, M. Sato, S. Nakajima, K. Yamashita, and T. Izumi, "A Soft Metal Hydride Actuator Using LaNi5 Alloy and a Laminate Film Bellows," IEEE International Conference on Industrial Techonology (ICIT), 2009.
  6. S. Ino, M. Sato, M. Hosono, S. Nakajima, K. Yamashita, T. Tanaka and T. Izumi, "Prototype Design of a Wearable Metal Hydride Actuator Using a Soft Bellows for Motor Rehabilitation," 30th Annual International IEEE EMBS Conference, 2008.
  7. S. Ino, M. Sato, M. Hosono, and T. Izumi, "Development of a Soft Metal Hydride Actuator Using a Laminate Bellows for Rehabilitation Systems," Sensors and Actuators B: Chemical, vol. 136, pp. 86-91, 2009. https://doi.org/10.1016/j.snb.2008.10.054
  8. K. Kurosaki, T. Maruyama, K. Takahashi, H. Muta, M. Uno, S. Yamanaka, "Design and Development of MH Actuator System," Sensors and Actuators A vol. 113, pp. 118-123, 2004. https://doi.org/10.1016/j.sna.2004.03.009
  9. M. Sato, S. Ino, N. Yoshida, T. Izumi, and T. Ifukube, "Portable Compressor System Using MH Alloys, Employed as Assistive Devices," IEEE Resion 10 Conference (TENCON 2006), 2006.
  10. S. Ino, M. Sato, M. Hosono, S. Nakajima, K. Yamashita, and T. Izumi, "Preminary Design of a Simple Passive Toe Exercise Apparatus with a Flexible Metal Hydride Actuator for Pressure Ulcer Prevention," 32nd Annual International Conference of the IEEE EMBS, 2010.
  11. M. Hosono, S. Ino, M. Sato, K. Yamashita, and T. Izumi, "A System Utilizing Metal Hydride Actuators to Achieve Passive Motion of Toe Joints for Prevention of Pressure Ulcers: A Pilot Study," Rehabilitation Research and Practice, vol 2012, 2012.
  12. G. M. Lloyd, K. J. Kim, "Smart Hydrogen/Metal Hydride Actuator," Inernational Journal of Hydrogen Energy, vol. 32, pp. 247-255, 2007. https://doi.org/10.1016/j.ijhydene.2006.03.014
  13. T. K. Kwon, D. Y. Pang, K. H. Choi, Y. Y. Kim, S. C. Lee, and N. G. Kim, "Development of a SMH Actuator System using Hydrogen-absorbing Alloys," Smart Mater. Struct. vol. 15, pp. 1-7, 2006. https://doi.org/10.1088/0964-1726/15/1/029
  14. T. K. Kwon, K. J. Hong, K. Kim, W. S. Jeon, D. Y. Pang, S. C. Lee, and N. G. Kim, "Development of SMH Actuator System Using Hydrogen-Absorbing Alloy," Journal of Control, Automation and Systems Engineering, vol. 13, no. 11, pp. 1067-1073, 2007. https://doi.org/10.5302/J.ICROS.2007.13.11.1067
  15. K. Kim, J. N. Kim, J. J. Kim, W. S. Chong, and T. K. Kwon, "The Study of Novel Actuator Using Special Metal-Hydride for Bio-Inspired Rehabilitation System," 014 Rehabilitation Engineering & Assistive Technology Society of Korea (RESKO) Academic Symposium, 2014.
  16. K. Kim, J. J. Kim, J. N. Kim, W. S. Chong, C. H. Yu, and T. K. Kwon, "Suggestion of Novel Actuator for Assitive & Rehabilitative Device of the Elderly and People with Disability," 37th Annual International Conference of the IEEE EMBS, 2015.
  17. J. M. Park, "A Study on the Hydrogenation Characteristics of Zr-based Laves Phase Intermetallic Compounds," These for Ph.D., Dept. of Materials Science and Engineering, KAIST, Korea, 1990.