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Bending continuous structures with SMAs: a novel robotic fish design.

C Rossi¹, J Colorado, W Coral

¹Centre for Automation and Robotics, Universidad Politécnica de Madrid, Madrid, Spain. claudio.rossi@upm.es

Bioinspiration & Biomimetics

|December 1, 2011

Summary

Researchers developed a motor-less, gear-less underwater robot inspired by fish locomotion. Shape memory alloys (SMAs) enable a flexible backbone, mimicking fish muscles for efficient swimming.

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Area of Science:

Robotics
Biomimetics
Materials Science

Background:

Traditional robots often rely on complex motors and gears, limiting their design and efficiency.
Bio-inspired locomotion offers novel approaches to robotic movement, drawing inspiration from natural systems.
Smart materials like shape memory alloys (SMAs) present opportunities for creating actuator-less robotic systems.

Purpose of the Study:

To design and develop a bio-inspired underwater robot utilizing shape memory alloys (SMAs) for locomotion.
To investigate the feasibility of creating motor-less and gear-less robots through the use of deformable structures and smart materials.
To replicate standard fish swimming patterns using SMA-based actuators and a flexible backbone.

Main Methods:

Utilizing shape memory alloys (SMAs) as actuators to bend a continuous backbone, mimicking fish muscle function.

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Designing a fish-like robot structure inspired by the biomechanics of fish red muscles and spinal curvature.

Implementing control strategies for SMA actuators to achieve desired swimming speeds and positional accuracy.

Conducting simulations and experimental trials to validate the robot's design and performance.

Main Results:

Successful development of a swimming underwater robot powered by SMAs, demonstrating fish-like movements.
Validation of SMA actuators' capability to generate body curvature for propulsion.
Demonstration of the potential for motor-less and gear-less robotic locomotion through bio-inspired design.
Analysis of SMA actuator control performance, including actuation speed and position accuracy.

Conclusions:

Bio-inspired locomotion systems using SMAs offer a promising alternative to traditional robotic actuation.
The developed fish-like robot successfully reproduces standard swimming patterns, showcasing the effectiveness of the design.
Further research into SMA control and material properties can enhance the performance and applicability of such bio-inspired robots.