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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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When an object is acted upon by a variable force, the amount of work done and the change in energy of the object can be more complex to calculate compared to when a constant force is applied. Work is the product of force and displacement, while energy is the capacity of a system to do work. When a constant force is applied to an object, the work done can be calculated as the product of the force and the distance moved in the direction of the force. However, when a variable force is applied, the...
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Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
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Mechanical Efficiency of Real Machines01:14

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The mechanical efficiency of a machine is a fundamental concept that describes how effectively a machine can convert input work into output work. According to this concept, the efficiency of a machine is equal to the ratio of the output work to the input work. An ideal machine, meaning a machine that has no energy losses, has an efficiency of one. This implies that the input work and the output work are equal.
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Conservation of Mechanical Energy01:05

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The mechanical energy E of a system is the sum of its potential energy U and the kinetic energy K of the objects within it. What happens to this mechanical energy when only conservative forces cause energy transfers within the system—that is, when frictional and drag forces do not act on the objects in the system? Also assume that the system is isolated from its environment; in other words no external force from an object outside the system causes energy changes inside the system.
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Skeletal muscle fibers have the unique ability to switch between rest and contraction states, using different sources of ATP for energy. The contraction cycle and Ca2+ transport back into the sarcoplasmic reticulum for relaxation require significant ATP. However, the ATP reserves in muscle fibers are limited and can only sustain contractions for a few seconds. Additional ATP production becomes necessary for prolonged contractions. As a result, muscle fibers generate ATP through various sources,...
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Training Persons with Spinal Cord Injury to Ambulate Using a Powered Exoskeleton
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Toward an active exoskeleton with full energy autonomy.

Yakir Knafo1,2, Yinjie Zhou3, Avi Manor2

  • 1Mechanical Engineering at Tel-Aviv University, Tel Aviv, Israel.

Frontiers in Robotics and AI
|June 24, 2025
PubMed
Summary

This study introduces a novel active knee exoskeleton that generates its own electricity during movement, reducing reliance on external batteries. This innovation could significantly extend exoskeleton operational time and enhance human performance.

Keywords:
active exoskeletonharvesting energymotoring modepassive exoskeletonregenerating modereturning energy

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Area of Science:

  • Biomechanical Engineering
  • Robotics
  • Wearable Technology

Background:

  • Active exoskeletons enhance human performance but are limited by battery power.
  • Current power sources restrict operational time and increase device weight.
  • A sustainable power solution is crucial for widespread exoskeleton adoption.

Purpose of the Study:

  • To design and develop an active knee exoskeleton capable of generating its own electrical power.
  • To investigate energy harvesting during specific human movements.
  • To assess the feasibility of self-powered exoskeletons for reducing external energy dependence.

Main Methods:

  • A novel knee exoskeleton with a direct-drive system and custom electronic board was designed and manufactured.
  • The system captures energy during the braking phase of motion (muscles as brakes).
  • Harvested energy is stored and reused to power the exoskeleton during the assisting phase (muscles as motors).

Main Results:

  • The prototype exoskeleton demonstrated energy harvesting capabilities during sit-to-stand (STS) motion.
  • During the lowering phase of STS, 9.4 J of energy was harvested.
  • During the rising phase, 6.8 J of harvested energy was returned, achieving a cycle efficiency of 72.3%.

Conclusions:

  • This study presents the first active exoskeleton for STS motion that generates its own electrical power.
  • The developed technology shows potential for significantly reducing the need for external power sources in exoskeletons.
  • Further development could lead to more autonomous and longer-operating exoskeleton systems.