A magnetorheological elastomer based proportional valve for soft pneumatic actuators
• +2
• Sihan Wang,
• Liang He,
• Alessandro Albini,
• Peizhi Zhang,
• Perla Maiolino
Sihan Wang
University of Oxford

Corresponding Author:sihan@oxfordrobotics.institute

Author Profile
Liang He
University of Oxford
Alessandro Albini
University of Oxford
Peizhi Zhang
Waseda University
Perla Maiolino
University of Oxford

## Abstract

The interest in soft pneumatic actuators has been growing rapidly in robotics, owing to the contact adaptability with the material softness. However, these actuators are mostly controlled by rigid electronic pneumatic valves, which can hardly be integrated into the robot itself, limiting its mobility and adaptability. Recent advances in soft or electronics-free valve designs provide the potential to achieve an integrated soft robotic system with reduced weight and rigidity. Nevertheless, the challenge in valve response remains open. To enable dynamic control of a soft pneumatic actuator, a fast-response proportional valve is needed. In this paper, we explored the potential of Ecoflex-based magnetorheological elastomer (MRE) membrane to create a proportional valve that can be used in the control of a soft robot made from the same silicone material. Experimental characterization shows that the proposed MRE valve (30 mm $$\times$$ 30 mm $$\times$$ 15 mm, 30 grams) can hold pressure up to 41.3 kPa and regulate the airflow in an analog manner. The valve is used to perform closed-loop Proportional-Integral-Differential (PID) control with 50 Hz on a soft pneumatic actuator and is able to control the pressure within the actuator chamber with a root-mean-square error of 0.05 kPa.
Corresponding author(s) Email:   sihan.wang@eng.ox.ac.uk
04 Aug 2022Submitted to AISY Interactive Papers
09 Aug 2022Published in AISY Interactive Papers