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Related Concept Videos

Machines: Problem Solving II01:30

Machines: Problem Solving II

Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. Consider a lifting tong carrying a 100 kg load. It comprises movable sections DAF and CBG linked together with member AB.
Machines: Problem Solving I01:22

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A toggle clamp is a mechanical device commonly used for holding and clamping objects in various applications, such as woodworking, metalworking, and assembly operations. Consider a toggle clamp subjected to a force of 200 N at the handle. The vertical clamping force can be calculated, provided the dimensions of the toggle clamp are known.
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Mechanical Efficiency of Real Machines

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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Machines

Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. One example of a machine is the cutting plier, which is used to cut wires by applying forces to its handles. When equal and opposite forces are exerted on the handles of the cutting plier, they cause the cutting edges to come together and apply equal and opposite reaction forces on the wire, which are greater than the applied forces.
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Related Experiment Video

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Application of a Dual Upper Limb Task-Oriented Robotic System for the Functional Recovery of the Upper Limb in Stroke Patients
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Study about upper limb on highly repetitive work in maquila operations.

Lopez-Millan Francisco1, Enrique De la Vega, Manuel Rodriguez

  • 1Instituto Tecnologico de Cd. Juarez, División de Estudios de Posgrado e Investigación, Ave. Tecnológico No. 1340 CP 32500 Ciudad Juárez, Chih. México.

Work (Reading, Mass.)
|February 10, 2012
PubMed
Summary

This study examines how upper extremity work impacts hand strength and fatigue. It aims to predict shoulder recovery times using non-biomechanical factors for industrial workers.

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Area of Science:

  • Occupational health
  • Ergonomics
  • Biomechanics

Background:

  • Industrial work frequently involves upper extremity tasks, impacting worker health.
  • Understanding the relationship between work demands, hand strength, and fatigue is crucial for preventing injuries.

Purpose of the Study:

  • To characterize the effects of upper extremity work on industrial workers.
  • To analyze the relationship between hand strength, fatigue, and occupational tasks.
  • To develop a predictive model for shoulder recovery time using non-biomechanical variables.

Main Methods:

  • Data collection on upper extremity work exposure.
  • Assessment of hand strength.
  • Evaluation of fatigue levels.
  • Development of a predictive model for shoulder recovery.

Main Results:

  • Characterization of upper extremity work effects.
  • Established correlations between work, hand strength, and fatigue.
  • Validated a novel model for estimating shoulder recovery times.

Conclusions:

  • Upper extremity workload significantly influences hand strength and fatigue.
  • Non-biomechanical factors can effectively predict shoulder recovery times in industrial settings.
  • The developed model offers a new approach to managing worker recovery and preventing occupational injuries.