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Related Concept Videos

Mechanical Systems01:22

Mechanical Systems

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Mechanical systems are analogous to to electrical networks where springs and masses play similar roles to inductors and capacitors, respectively. A viscous damper in mechanical systems functions similarly to a resistor in electrical networks, dissipating energy. The forces acting on a mass in such systems include an applied force in the direction of motion, counteracted by forces from the spring, a viscous damper, and the mass's acceleration. This interplay of forces is mathematically...
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Electro-mechanical Systems01:19

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Electromechanical systems are intricate configurations that effectively combine electrical and mechanical elements to achieve a desired outcome. Central to many of these systems is the DC motor, a device that converts electrical energy into mechanical motion, enabling various applications ranging from simple fans to complex robotic mechanisms.
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In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
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Related Experiment Video

Updated: Jun 18, 2025

Fabrication of Soft Pneumatic Network Actuators with Oblique Chambers
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Jellyfish-Inspired Soft Robot Driven by Pneumatic Bistable Actuators.

Shenlong Wang1, Zeng Qiao1, Zhaoling Li1

  • 1School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai, China.

Soft Robotics
|July 30, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a jellyfish-inspired soft actuator for efficient water-jet propulsion. This novel soft pneumatic bistable actuator achieves high speeds and load capacity, advancing biomimetic robot capabilities.

Keywords:
pneumatic bistable actuatorsoft actuatorstructural designswimming performancewater-jet propulsion

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Area of Science:

  • Robotics
  • Biomimetics
  • Fluid Dynamics

Background:

  • Soft actuators face challenges in achieving high driving force and fast response speeds for practical applications.
  • Jellyfish exhibit efficient water-jet propulsion through subumbrellar muscle motion, offering a model for biomimetic designs.

Purpose of the Study:

  • To design, fabricate, and analyze a soft pneumatic bistable actuator (PBA) mimicking jellyfish muscle motion for water-jet propulsion.
  • To integrate the PBA into a jellyfish-like prototype and evaluate its swimming performance and load-bearing capacity.

Main Methods:

  • Developed an elastic band stretch prebending PBA with a simple structure and low inflation cost.
  • Integrated the PBA into a jellyfish-like prototype, incorporating a skin-like structure to optimize fluid dynamics.
  • Analyzed the swimming performance, including speed and load capacity, of the tethered and untethered prototypes.

Main Results:

  • The PBA demonstrated exceptional driving performance and stable force output.
  • The jellyfish-like prototype achieved swimming speeds of 3.8 cm/s (tethered) and 4.7 cm/s (untethered).
  • The prototype exhibited notable load-bearing capacity and fast-forward swimming compared to other underwater biomimetic robots.

Conclusions:

  • The developed soft pneumatic bistable actuator effectively mimics jellyfish propulsion for efficient water-jetting.
  • The integration of skin-like structures enhances the maneuverability and efficiency of soft robotic systems.
  • This research offers insights for creating agile, fast-responsive soft robots for underwater applications.