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Related Concept Videos

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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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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An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the...
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When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
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Fabrication of Soft Pneumatic Network Actuators with Oblique Chambers
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A TEC Cooling Soft Robot Driven by Twisted String Actuators.

Shun Zhao1, Xuewei Lu1, Kunyang Wang1,2,3

  • 1Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun 130025, China.

Biomimetics (Basel, Switzerland)
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Summary

This study introduces a novel cooling system for artificial muscles, enabling soft robots to achieve higher movement frequencies. The system also allows for self-sensing capabilities, improving robot performance and control.

Keywords:
self-sensingsoft-hardware integration for robot systemsthermoelectric coolertwisted polymer actuator

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Area of Science:

  • Robotics
  • Materials Science
  • Biomimetics

Background:

  • Artificial muscles offer advantages for bionic robots but lag behind biological muscle performance.
  • Twisted polymer actuators (TPAs) provide high energy efficiency and large strain/stress outputs but are limited by heat sensitivity.
  • Existing soft robots using TPAs have low movement frequencies due to thermal limitations.

Purpose of the Study:

  • To develop a simple, lightweight, low-cost, self-sensing soft robot powered by TPAs.
  • To enhance the movement frequency of TPA-driven robots through an effective cooling system.
  • To investigate the self-sensing capabilities of TPAs based on contraction length and resistance.

Main Methods:

  • Integration of a thermoelectric cooler (TEC) and temperature sensor to create a closed-loop temperature control system.
  • Maintaining internal robot temperature at 5°C for rapid TPA cooling.
  • Developing a self-sensing mechanism by correlating TPA contraction length and electrical resistance with robot motion.

Main Results:

  • The developed closed-loop cooling system enabled TPA-driven robots to achieve a movement frequency of 1 Hz.
  • The self-sensing soft robot demonstrated good accuracy, with a root-mean-square error of less than 3.89% of the measurement amplitude at 0.01 Hz.
  • The study successfully verified the autokinetic performance and improved operational frequency of TPAs.

Conclusions:

  • A novel cooling method using TEC significantly enhances the movement frequency of TPA-driven soft robots.
  • The proposed TPA-based self-sensing mechanism provides accurate feedback on robot motion.
  • This research contributes to the development of more capable and efficient bionic robots.