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SMA micro-hand implemented in small robot for generating gestures.

Ishikawa Takumi¹, Nagasawa Sumito²

¹Department of Mechanical Engineering, Graduate School of Science and Engineering, Shibaura Institute of Technology, 3-7-5 Toyosu, Koto-ku, Tokyo, 135-8548 Japan.

Intelligent Service Robotics

|April 28, 2021

Summary

This summary is machine-generated.

Researchers developed a small robot hand using shape memory alloy (SMA) actuators for human communication. This novel robot hand successfully generates recognizable symbolic gestures, enhancing human-robot interaction.

Keywords:

Gesture Micro-robot Robot hand Shape memory alloy

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Area of Science:

Robotics
Human-Robot Interaction
Materials Science

Background:

Communication robots are increasingly popular for human interaction.
Small robot size and non-verbal communication, like gestures, are crucial for reducing user threat and facilitating interaction.
Existing small communication robots with gesture capabilities are limited.

Purpose of the Study:

To propose and develop a small robot hand optimized for gesture communication.
To utilize shape memory alloy (SMA) as an actuator for robot finger movement.
To meet specific design specifications for size, joint angles, response time, and power consumption.

Main Methods:

A small robot hand was designed using Ti-Ni alloy shape memory alloy (SMA) wires as actuators for each finger.
SMA actuators leverage phase transformation (austenite and martensitic) for finger movement.
Robot hand specifications were determined based on human finger biomechanics and existing small communication robots, with careful design of geometry and heating/cooling control.

Main Results:

The developed robot hand met the determined specifications for size, operation angles, response times, and power consumption.
A questionnaire-based survey confirmed the robot hand's ability to generate recognizable symbolic gestures.
The Ti-Ni SMA effectively actuated individual finger movements for gesture generation.

Conclusions:

The proposed small robot hand, actuated by SMA, is effective for gesture communication.
The design successfully balances miniaturization with functional gesture generation capabilities.
This technology has the potential to improve naturalness and reduce the feeling of threat in human-robot communication.