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Related Concept Videos

Torque Free Motion01:15

Torque Free Motion

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The torque-free motion refers to the movement of a rigid body in space when no external torques are acting upon it. This type of motion can be observed in environments where there are no external forces or frictions, like in outer space. For example, a rotation of Mars in space is a torque-free motion. Mars is an axisymmetric object, meaning it has an axis of symmetry along which it rotates, designated as the z-axis. The rotating frame of reference is defined such that the center of mass of...
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Mechanical Systems01:22

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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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In mechanical engineering, one-degree-of-freedom systems form the basis of a wide range of electrical and mechanical components. Using these models, engineers can predict the behavior of various parts in a larger system, which gives them insight into how different forces interact with each other.
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Virtual work is a powerful method used to solve problems involving several connected rigid bodies. When the system is in equilibrium, virtual work is zero. This allows the calculation of the resulting forces when a system undergoes a virtual displacement. When attempting to analyze such a system, first, use a free-body diagram, where an independent coordinate represents the configuration of the links, and mark its deflected position resulting from the positive virtual displacement.
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Stability of structures01:14

Stability of structures

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In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
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Support Reactions in Three Dimensions

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Support reactions in three dimensions help maintain the stability and equilibrium of various structures and systems. These reactions prevent the system from translating and rotating, ensuring the design can withstand external forces and perform its intended function efficiently and safely. Some of the supports providing support reactions in three dimensions are discussed below:
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Updated: Jun 27, 2025

Fabrication of Soft Pneumatic Network Actuators with Oblique Chambers
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Untethered soft actuators for soft standalone robotics.

Yeongju Jung1, Kangkyu Kwon1, Jinwoo Lee2

  • 1Applied Nano and Thermal Science Lab, Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea.

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Untethered soft actuators overcome power supply limitations of traditional soft robots. This review explores innovative materials and strategies for advanced, wire-free soft robotic applications.

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Area of Science:

  • Robotics
  • Materials Science
  • Mechanical Engineering

Background:

  • Soft actuators are crucial for soft robot movement but are often limited by wired power supplies.
  • Existing soft actuators frequently rely on electrical wires or pneumatic tubes, restricting practical applications.
  • Untethered soft actuators offer a solution to these power supply limitations.

Purpose of the Study:

  • To review recent breakthroughs in untethered soft actuator technology.
  • To discuss the functional materials and innovative strategies enabling wire-free soft actuators.
  • To provide perspectives on future challenges and opportunities in soft actuator development.

Main Methods:

  • Literature review of untethered soft actuator research.
  • Analysis of functional materials and design strategies for wire-free actuation.
  • Discussion of current limitations and future research directions.

Main Results:

  • Identification of novel untethered soft actuator designs.
  • Overview of key materials enabling self-powered soft actuation.
  • Synthesis of strategies for overcoming tethering limitations.

Conclusions:

  • Untethered soft actuators represent a significant advancement for soft robotics.
  • Further research into materials and strategies will unlock new applications.
  • Addressing current challenges will pave the way for next-generation soft robots.