Slithering towards autonomy: a self-contained soft robotic snake platform with integrated curvature sensing

• Published in: Bioinspiration & biomimetics Vol. 10; no. 5; pp. 55001 - 11
• Main Authors: Luo, Ming, Pan, Yixiao, Skorina, Erik H, Tao, Weijia, Chen, Fuchen, Ozel, Selim, Onal, Cagdas D
• Format: Journal Article
• Language: English
• Published: England IOP Publishing 03.09.2015
• Subjects: Animals; Automation; Biomimetics - instrumentation; Computer Simulation; Computer-Aided Design; Curvature; dynamic modeling; embedded curvature sensing; Equipment Design; Equipment Failure Analysis; Feedback, Physiological; fluidic elastomer actuators; Gait - physiology; Industrial robots; lateral undulation; Machine Learning; Manufacturing engineering; Mathematical analysis; Mathematical models; Models, Biological; Motion; Platforms; Pressure; Robotics - instrumentation; Sensation - physiology; snake robot; Snakes; Snakes - physiology; soft robotics; Spatial Navigation; Systems Integration
• ISSN: 1748-3190; 1748-3182; 1748-3190
• DOI: 10.1088/1748-3190/10/5/055001

Soft robotic snakes promise significant advantages in achieving traveling curvature waves with a reduced number of active segments as well as allowing for safe and adaptive interaction with the environment and human users. However, current soft robot platforms suffer from a lack of accurate theoretical dynamic models and proprioceptive measurements, which impede advancements toward full autonomy. To address this gap, this paper details our recent results on the design, fabrication, and experimental evaluation of a new-generation pressure-operated soft robotic snake platform we call the WPI SRS, which employs custom magnetic sensors embedded in a flexible backbone to continuously monitor the curvature of each of its four bidirectional bending segments. In addition, we present a complete and accurate dynamic undulatory locomotion model that accounts for the propagation of frictional moments to describe linear and rotational motions of the SRS. Experimental studies indicate that on-board sensory measurements provide accurate real-time curvature feedback, and numerical simulations offer a level of abstraction for lateral undulation under ideal conditions.