Better bicycle helmets for commuters – evaluation of ventilation
Författare
Summary, in English
These 1:1 scaled mock-ups were tested at Thermal Environment Laboratory, Lund University for their heat transfer characteristics (insulation) in a wind tunnel on a thermal head manikin. The helmets were tested at the room temperature with the air velocities of 0.2, 1.6 and 6.0 m/s. The air velocities of 0.2 and 1.6 m/s were tested without a wig and 1.6 and 6.0 m/s were tested with wig to simulate the effect of hair. In addition, 4 reference helmets were tested in some conditions. Three (3) of them were one of the best, one average and one of the less well performing helmets of an earlier study, and one was a helmet commonly bought and used by an ordinary bicyclist.
The helmets in new design were affected by ventilation and covered a wide range of insula-tion. The reference helmets from the earlier study stayed quite in the middle of the tested range. Thus, the new solutions could work much better or worse than available helmets. However, practically any new helmet was better than the common helmet from the shop. It was also very clear that various air velocities affected heat loss from the helmets. This means that a best solution for a commuter has to be defined by the user’s bicycling velocity.
The best ventilation solutions will be chosen and the design work with considering of impact testing will be continued.
Avdelning/ar
Publiceringsår
2014
Språk
Engelska
Publikation/Tidskrift/Serie
International Cycling Safety Conference 2014
Fulltext
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Dokumenttyp
Konferensbidrag
Förlag
SAFER Vehicle and Traffic Safety Centre at Chalmers, Chalmers University of Technology
Ämne
- Production Engineering, Human Work Science and Ergonomics
Nyckelord
- bicycle helmets
- heat loss
- ventilation
- design
Conference name
International Cycling Safety Conference 2014
Conference date
2014-11-18 - 2014-11-19
Conference place
Lindholmen Conference Centre, Lindholmspiren 3-5, 417 56 Gothenburg, Sweden
Status
Published
Forskningsgrupp
- Thermal Environment Laboratory