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research-article

Development of an Insect-Inspired Hexapod Robot Actuated by Soft Actuators

[+] Author and Article Information
Canh Toan Nguyen

Postdoctoral Researcher, Robotics Innovatory Laboratory, School of Mechanical Engineering, Sungkyunkwan University, Suwon, 440-746, South Korea
toannguyen@me.skku.ac.kr

Hoa Phung

Ph.D. Student, Robotics Innovatory Laboratory, School of Mechanical Engineering, Sungkyunkwan University, Suwon, 440-746, South Korea
phunghoa@skku.edu

Phi Tien Hoang

Master Student, Robotics Innovatory Laboratory, School of Mechanical Engineering, Sungkyunkwan University, Suwon, 440-746, South Korea
phitien@skku.edu

Tien Dat Nguyen

Ph.D. Student, Robotics Innovatory Laboratory, School of Mechanical Engineering, Sungkyunkwan University, Suwon, 440-746, South Korea
tiendat@me.skku.ac.kr

Hosang Jung

Ph.D. Student, Robotics Innovatory Laboratory, School of Mechanical Engineering, Sungkyunkwan University, Suwon, 440-746, South Korea
jhsx1004@skku.edu

Hyouk Ryeol Choi

Professor, Robotics Innovatory Laboratory, School of Mechanical Engineering, Sungkyunkwan University, Suwon, 440-746, South Korea
hrchoi@me.skku.ac.kr

1Corresponding author.

ASME doi:10.1115/1.4041258 History: Received December 14, 2017; Revised August 12, 2018

Abstract

Insects are one of the most diverse group of animals on the planet and are almost ubiquitous. Their walking locomotion has inspired engineers and provided effective solutions for designing transport methods for legged robots. In this paper, we introduce a hexapod walking robot that mimics the design and walking motions of insects. The robot is characterized by small size, light weight, simple structure, and considerably fast walking speed. Three pairs of its legs are driven by three five-degrees-of-freedom (5-DOF) soft actuators based on dielectric elastomer actuators which can provide up to five movements (including three translations and two rotations) within a compact structure. The robot imitates the crawling motion of an insect using the alternating tripod gait. The experiments show that the robot can achieve an average walking speed of 5.2 cm/s (approximately 21 body-lengths per minute) at 7 Hz of actuation frequency on flat rigid surfaces. Furthermore, the robot also demonstrates the omnidirectional capabilities of walking sideways and rotating its body direction, which enhance the potential of applying the proposed robot in practical uses.

Copyright (c) 2018 by ASME
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