This paper introduces the design and fabrication of a crawling soft robot controlled by a Shape Memory Alloy (SMA) wire. The robotic smart structure was inspired by the inchworm’s abdominal contractions during locomotion. The SMA wires were embedded longitudinally in the robotic body to imitate the inchworm’s longitudinal muscle fibers that are used to control the inchworm’s abdominal contractions. A ratchet structure was used to imitate the inchworm’s feet and provided friction with the ground during moving. Based on the resistor self-feedback of the SMA wire, we proposed an adaptive control strategy to avoid overheating. Experiments were conducted to evaluate the robotic locomotive performance for crawling, avoiding an obstacle, and the effect of the adaptive control strategy. The maximum speed of the robot was 48 mm·min−1, and the SMA wire’s temperature was kept below 69 °C to prevent overheating. Those results show that this robot is with the ability to adapt to different environments.
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Rodrigue H, Wang W, Han M W, Kim T J Y, Ahn S H. An overview of shape memory alloy-coupled actuators and robots. Soft Robotics, 2017, 4, 3–15.
Bao G J, Fang H, Chen L F, Wan Y H, Xu F, Yang Q H, Zhang L B. Soft robotics: Academic insights and perspectives through bibliometric analysis. Soft Robotics, 2018, 5, 229–241.
Severinson-Eklundh K, Green A, Hüttenrauch H. Social and collaborative aspects of interaction with a service robot. Robotics and Autonomous Systems, 2003, 42, 223–234.
Ghasem A, Sharma A, Greif D N, Alam M, Al M M. The arrival of robotics in spine surgery a review of the literature. Spine, 2018, 43, 1670–1677.
Kim S, Laschi C, Trimmer B. Soft robotics: A bioinspired evolution in robotics. Trends in Biotechnology, 2013, 31, 287–294.
Gong Z Y, Cheng J H, Chen X Y, Sun W G, Fang X, Hu K N, Xie Z X, Wang T M, Wen L. A bio-inspired soft robotic arm: Kinematic modeling and hydrodynamic experiments. Journal of Bionic Engineering, 2018, 15, 204–219
Hao Y F, Gong Z Y, Xie Z X, Guan S Y, Yang X B, Wang T M, Wen L. A soft bionic gripper with variable effective length. Journal of Bionic Engineering, 2018, 15, 220–235.
Jin H, Dong E B, Xu M, Liu C S, Alici G, Jie Y. Soft and smart modular structures actuated by shape memory alloy (SMA) wires as tentacles of soft robots. Smart Materials and Structures, 2016, 25, 085026.
Tang Y C, Zhang Q T, Lin G J, Yin J. Switchable adhesion actuator for amphibious climbing soft robot. Soft Robotics, 2018, 5, 592–600.
Trimmer B. A journal of soft robotics: Why now? Soft Robotics, 2014, 1, 1–4.
Zhao Y, Jin L, Zhang P, Li J Y. Inverse displacement analysis of a hyper-redundant elephant’s trunk robot. Journal of Bionic Engineering, 2018, 15, 397–107.
Shepherd R F, Ilievski F, Choi W, Morin S A, Stokes, A A, Mazzeo A D, Chen X, Wang M, Whitesides G M. Multigait soft robot. Proceedings of the National Academy of Sciences of the United States of America, 2011, 108, 20400–20403.
Zhang J J, Yin Y H, Zhu J Y. Electrical resistivity-based study of self-sensing properties for shape memory alloy-actuated artificial muscle. Sensors, 2013, 13, 12958–12974.
Lee H T, Kim M S, Lee G Y, Kim C S, Ahn S N. Shape memory alloy (SMA)-based microscale actuators with 60% deformation rate and 1.6 kHz actuation speed. Small, 2018, 14, 1801023.
Roh J H, Kim J S, Kwon O H. Vibration behaviors of hybrid smart composites with SMA strips reinforced SMP lamina under blast loading. Composite Structures, 2015, 125, 417–424.
Shen Q, Trabia S, Stalbaum T, Palmre V, Kim K, Oh I K. A multiple-shape memory polymer-metal composite actuator capable of programmable control, creating complex 3D motion of bending, twisting, and oscillation. Scientific Reports, 2016, 6, 24462.
Yang Y, Chen Y H, Li Y T, Wang Z, Li Y Q. Novel variable-stiffness robotic fingers with built-in position feedback. Soft Robotics, 2017, 4, 338–352.
Li W B, Zhang W M, Zou H X, Peng Z K, Meng G. A fast rolling soft robot driven by dielectric elastomer. IEEE/ASME Transactions on Mechatronics, 2018, 23, 1630–1640.
Mazzolai B, Margheri L, Cianchetti M, Dario P, Laschi C. Soft-robotic arm inspired by the octopus: II. From artificial requirements to innovative technological solutions. Bioinspiration & Biomimetics, 2012, 7, 025005.
Wang W, Ahn S-H. Shape memory alloy-Based soft gripper with variable stiffness for compliant and effective grasping. Soft Robotics, 2017, 4, 379–389.
Lin H T, Leisk G G, Trimmer B. GoQBot: A caterpillar-inspired soft-bodied rolling robot. Bioinspiration & Biomimetics, 2011, 6, 026007
Ueno S, Takemura K, Yokota S, Edamura K. Micro inchworm robot using electro-conjugate fluid. Sensors and Actuators A: Physical, 2014, 216, 36–42.
Wang W, Lee J Y, Rodrigue H, Song S H, Chu W S, Ahn S H. Locomotion of inchworm-inspired robot made of smart soft composite (SSC). Bioinspiration & Biomimetics, 2014, 9, 046006.
Honigmann P, Sharma N, Okolo B, Popp U, Msallem B, Thieringer F M. Patient-specific surgical implants made of 3D printed PEEK: Material, technology, and scope of surgical application. Biomed Research International, 2018, 2018, 4520636.
Wang T M, Shi Z Y, Liu D, Ma C, Zhang Z H. An accurately controlled antagonistic shape memory alloy actuator with self-sensing. Sensors, 2012, 12, 7682–7700.
The authors gratefully acknowledge the financial supported by the National Science Foundation of China (No. 61603015)
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Shi, Z., Pan, J., Tian, J. et al. An Inchworm-inspired Crawling Robot. J Bionic Eng 16, 582–592 (2019) doi:10.1007/s42235-019-0047-y
- soft robot
- shape memory alloy
- smart structure