VARIABLE STRUCTURE CONTROLLER OF NOVEL EMBEDDED SMA ACTUATORS

Yıl 2005, Cilt: 5 Sayı: 1, 1255 - 1263, 28.12.2011

Yang Kaı Gu Chenglın

Öz

A novel shape memory alloy (SMA) actuator consisting of a cylindrical rod with a single off-axis embedded one-way SMA wire is first described. The actuators, acting as both actuating elements and executing elements, are compact enough to be used in miniature robot system. The practical specifications of the SMA wire and the flexible rod were determined based on a series of formulae. The mechanical properties of the actuator are also investigated.   After time domain open loop experiments and simulation, the simple model, a single integrator, is derived. A variable structure controller was then applied to the novel actuator. The feedback switches according to the sign of the curvature error. It was verified that the controller could realize smooth and robust control of the actuators.

Anahtar Kelimeler

SMA, elastomeric rod, actuator, variable structure control

Kaynakça

• Dai Honma, Yoshiyuki Miwa, and Nobuhiro Iguchi, “Micro robots and micro mechanisms using shape memory alloy. In Integrated Micro Motion Systems, Micro-machining, Control and Application. Nissin. Aichi. Japan.. The Third Toyota conference, Oct. 1989.
• K.Kuribayashi, “A new actuator of a joint mechanism using TiNi alloy wire”, The Int. Journal of Robotics Research, 4(4), 1986.
• Minoru Hashimoto, Masanori Takeda. Hirofumi Sagawa Ichiro Chiba and Kimiko Sato, “Application of shape memory alloy to robotic actuators”, Robotic Systems 2(1) 3-25 ,1985.
• M. Bergamasco, F. Salsedo and P. Dario, “ A linear SMA motor as direct-drive robotic actuator”, IEEE International Conference on Robotics and Automation, pp 618-623, 1989.
• D.Yang, G.Lin, and R.Warrington, “A computational model of shape memory alloys for the design and control of micro-actuators” Micromechanical Systems, v4, 1992.
• K. Ikuta, M. Tsukamoto, and S. Hirose, “Mathematical model and experimental verification of shape memory alloy for designing micro actuator”, In Proc. of the IEEE MicroElectroMechanical Systems Conference, ppp.103-108, 1991.
• D. Reynaerts and H. Van Brussel, “Development of a SMA high performance robotic actuator”, In Fifth International Conference on Advanced Robotics, Volume 2, pp. 19-27, New York, NY, 1991.
• D.R. Madill, “Modelling and stability of a shape memory alloy position control system”, Master's thesis, Applied Science, University of Waterloo, 1993.
• I. Hunter, S. Lafontaine, J. Hollerbach, and P. Hunter, “Fast reversible NiTi fibers for use in microrobotics”, In Microelectro-mechanical Systems, Nara,Japan, Jan 1991.
• Lagoudas D C and Tadjbakhsh J G., “Active flexible rods with embedded SMA fibers”, Smart Mater. Struct, (1)162-7, 1992
• V. L. Utkin., “Sliding Modes in Control Optimization”, Springer-Verlag, 1992.