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JRM Vol.34 No.3 pp. 588-598
doi: 10.20965/jrm.2022.p0588
(2022)

Paper:

Multi-Legged Inspection Robot with Twist-Based Crouching and Fine Adjustment Mechanism

Maroay Phlernjai* and Photchara Ratsamee**

*Sirindhorn International Institute of Technology, Thammasat University
99 Moo 18, Km. 41 on Paholyothin Highway Khlong Luang, Pathum Thani 12120, Thailand

**Cyber Media Center, Osaka University
5-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan

Received:
June 8, 2021
Accepted:
December 3, 2021
Published:
June 20, 2022
Keywords:
inspection robot, crouching motion, inspection strategy, motion planning
Abstract

The monitoring and inspection of buildings, towers, and large chemical tanks can be dangerous and costly. A wall climbing multi-legged robot can climb and crouch to move the inspection probe closer to the wall surface. The typical wall-sticking crouching motion of multi-legged robot is unable to achieve this without an additional actuator at the foot base. This limits the design of a magnetic leg that is bulky enough to keep the robot stable during inspections. This paper provides the concept and implementation details of a coarse-to-fine inspection using a novel twisting motion to crouch the robot towards the steel surface without the need for an additional actuator at the magnetized foot joint. The center position error of this method is reported as less than 1 cm in radius. Additionally, this paper suggests using a linear motor to provide fine-tuning capability for the gentle touch of the ultrasonic inspection probe to the steel surface, protecting the probe from a direct crash during the coarse twisting crouch movement. Experiments have been conducted to confirm the validity of this concept on horizontally flat steel plates. The robot successfully crouch towards the surface and gently touch it with the ultrasonic probe. The results were reliable and comparable to manual inspection. For the 2 mm and 3 mm sample plates, the average measurement error compared to the ground truth from a vernier caliper was less than 2%, which is better than the measurement error (3%) of humans. The total time used was 2.475 seconds per inspection spot, which is 5.6 times faster compared to the expected time used to cover the same distance with a typical probe extension using a lead screw drive.

Twist-based crouching motion by multi-legged inspection robot for UT inspection

Twist-based crouching motion by multi-legged inspection robot for UT inspection

Cite this article as:
M. Phlernjai and P. Ratsamee, “Multi-Legged Inspection Robot with Twist-Based Crouching and Fine Adjustment Mechanism,” J. Robot. Mechatron., Vol.34 No.3, pp. 588-598, 2022.
Data files:
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Last updated on Oct. 11, 2024