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Fabrication of Soft Pneumatic Network Actuators with Oblique Chambers
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Design and Machine Learning Modeling of a Multi-Degree-of-Freedom Bionic Pneumatic Soft Actuator.

Yu Zhang1, Linghui Peng1, Wenchuan Zhao1

  • 1College of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China.

Biomimetics (Basel, Switzerland)
|September 26, 2025
PubMed
Summary
This summary is machine-generated.

A novel bionic Soft Pneumatic Actuator (SPA), mimicking a sea turtle

Keywords:
bionic sea turtleinertial measurement unitmachine learning modelingmulti-degree of freedomsoft pneumatic actuator

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Area of Science:

  • Robotics
  • Biomimetics
  • Materials Science

Background:

  • Soft Pneumatic Actuators (SPAs) offer unique advantages for applications requiring complex movements and compliance.
  • Traditional modeling approaches struggle with the nonlinear dynamics inherent in complex SPA structures.
  • Bionic designs, inspired by natural systems, present promising avenues for advanced actuator development.

Purpose of the Study:

  • To propose and develop a novel multi-degree-of-freedom bionic Soft Pneumatic Actuator (SPA) inspired by the sea turtle's shoulder joint.
  • To investigate the feasibility of restoring multi-modal motions of a sea turtle's flipper limb in three-dimensional space using the developed SPA.
  • To address the challenges in modeling the nonlinear behavior of complex SPA structures.

Main Methods:

  • The SPA is constructed using oblique chamber actuator units enabling omnidirectional bending and bi-directional twisting.
  • A high-precision Inertial Measurement Unit (IMU) is employed for real-time extraction of attitude information from each actuator axis.
  • Six machine learning methods were utilized to model the attitude outputs of the SPA, with a focus on identifying the best-performing model.

Main Results:

  • The XGBoost machine learning model demonstrated superior performance in attitude modeling, achieving an R-squared value of 0.974.
  • The XGBoost model exhibited low average absolute errors for Roll (1.315°), Pitch (1.543°), and Yaw (1.048°) axes.
  • The developed SPA successfully met the bionic sea turtle shoulder joint requirements, as validated through deformation capability, actuation performance, and underwater experiments.

Conclusions:

  • The proposed bionic SPA accurately models and predicts multi-axis attitude in real time, overcoming traditional modeling limitations.
  • The SPA's design and performance align with the functional requirements of a sea turtle's shoulder joint, enabling complex 3D movements.
  • This research establishes a new theoretical foundation and technical pathway for the development and control of complex multi-degree-of-freedom SPA systems.