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Related Experiment Videos

A system for quantifying the cooling effectiveness of bicycle helmets.

J Reid1, E L Wang

  • 1Department of Mechanical Engineering, University of Nevada-Reno 89557, USA.

Journal of Biomechanical Engineering
|October 19, 2000
PubMed
Summary

A new system quantifies bicycle helmet thermal comfort using a heated mannequin and reference sphere. This method provides a cooling effectiveness (C1) metric to aid designers in improving helmet ventilation and user comfort.

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Area of Science:

  • Sports Engineering
  • Biomechanics
  • Thermal Comfort Science

Background:

  • Bicycle helmet use is encouraged for safety, but thermal comfort can be a barrier.
  • Designers currently lack objective methods to quantify helmet thermal performance.
  • Understanding thermal comfort is crucial for enhancing rider experience and helmet adoption.

Purpose of the Study:

  • To design and develop a system for quantifying bicycle helmet thermal comfort.
  • To provide designers with a quantitative tool for evaluating helmet ventilation.
  • To establish a metric for comparing helmet thermal performance.

Main Methods:

  • A system comprising a heated mannequin head form, heated reference sphere, wind tunnel, and data acquisition was developed.
  • Thermocouples instrumented both the head form and reference sphere for temperature measurement.

Related Experiment Videos

  • The system simulated cycling speeds from 4.5 to 15.5 m/s.

    • Main Results:

    • A cooling effectiveness (C1) metric was defined, independent of ambient conditions and wind velocity.
    • This metric quantifies helmet ventilation relative to a reference sphere.
    • Six commercial bicycle helmets from 1992-1998 were tested to validate the system.

    Conclusions:

    • The developed system provides a reliable method for assessing bicycle helmet thermal comfort.
    • The cooling effectiveness (C1) metric offers a valuable tool for helmet design and comparison.
    • This research contributes to improving helmet design for increased user comfort and adoption.