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Related Experiment Videos

Forces associated with pneumatic power screwdriver operation: statics and dynamics.

Jia-Hua Lin1, Robert G Radwin, Frank J Fronczak

  • 1Liberty Mutual Research Institute for Safety, Hopkinton, MA, USA.

Ergonomics
|August 23, 2003
PubMed
Summary

This study developed models to predict forces from pneumatic power screwdrivers on human operators. The models accurately estimate torque and handle forces, aiding in tool design to prevent workplace injuries.

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Correction: Wu et al. Synthesis of Novel Lipophilic <i>N</i>-Substituted Norcantharimide Derivatives and Evaluation of Their Anticancer Activities. <i>Molecules</i> 2014, <i>19</i>, 6911-6928.

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Area of Science:

  • Ergonomics and Biomechanics
  • Mechanical Engineering
  • Occupational Safety

Background:

  • Pneumatic power screwdrivers generate forces on operators, potentially leading to musculoskeletal disorders.
  • Accurate prediction of these forces is crucial for ergonomic tool design and injury prevention.

Purpose of the Study:

  • To develop and validate static and dynamic models for predicting forces exerted by pneumatic power screwdrivers on human operators.
  • To inform the design of power screwdrivers for minimizing operator handle forces.

Main Methods:

  • Developed a static force model considering tool geometry, mass, orientation, feed force, and torque.
  • Formulated a dynamic model for pneumatic motor torque build-up based on fastener joint hardness.
  • Validated models using six pneumatic tools, calculating prediction errors for torque and handle forces.

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Main Results:

  • Static model accurately estimates handle forces for pistol grip, right angle, and in-line tool shapes.
  • Dynamic model achieved average torque prediction errors of 6.6% (medium-soft joint) and 5.2% (hard joint).
  • Average handle force prediction errors were 6.7% (medium-soft joint) and 3.6% (hard joint).

Conclusions:

  • The developed static and dynamic models provide accurate predictions of pneumatic power screwdriver forces.
  • These models are valuable for selecting and designing tools to minimize operator handle forces.
  • Application of these models can aid in preventing work-related musculoskeletal disorders.