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Related Experiment Videos

Computer simulation of counterlungs

S P Tomlinson1, J Livesey, D G Tilley

  • 1Fluid Power Centre, School of Mechanical Engineering, University of Bath, Hants, United Kingdom.

Undersea & Hyperbaric Medicine : Journal of the Undersea and Hyperbaric Medical Society, Inc
|March 1, 1993
PubMed
Summary

A new computer model simulates chest-mounted counterlungs, predicting their complex behavior and aiding in the design of diving equipment. This model enhances understanding of work of breathing for divers.

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Area of Science:

  • Biomedical Engineering
  • Diving Physiology
  • Computational Fluid Dynamics

Background:

  • Chest-mounted counterlungs are crucial components in rebreather diving systems.
  • Understanding counterlung behavior is essential for optimizing diver safety and performance.
  • Existing models may not fully capture the complex, non-linear dynamics of counterlungs.

Purpose of the Study:

  • To develop and validate a comprehensive computer model for chest-mounted counterlungs.
  • To analyze the factors contributing to the diver's work of breathing.
  • To enable prediction of the performance of practical counterlung systems.

Main Methods:

  • Developed a validated computer model incorporating counterlung shape, effective volume, and pressure centroid.

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  • Employed a sophisticated numerical integration method for time-domain analysis of pressure and volume.
  • Incorporated three distinct stiffness terms: material elastic, gas, and hydrostatic stiffness.

    • Main Results:

    • The model accurately predicts the non-linear and discontinuous behavior of counterlungs.
    • Quantified the contributions of material, gas, and hydrostatic stiffness to work of breathing.
    • Demonstrated the model's applicability to various counterlung systems.

    Conclusions:

    • The developed model represents a significant advancement in understanding counterlung mechanics.
    • The model allows for the prediction of performance in real-world diving equipment.
    • This research can inform the design of safer and more efficient rebreather systems.