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Better bicycle helmets for commuters – evaluation of ventilation

Författare

  • Helena Aljaste
  • Kalev Kuklane
  • Sixten Sebastian Heidmets

Summary, in English

As a continuation of the work on the development of setting the requirements for ventilation of a bicycle helmet for commuters, 15 full scale helmet mock-ups were created by the students of the Estonian Academy of Arts. In order to encourage creativity for ventilation solutions the students were not restricted to consider the other properties except it was pointed out that the meaning of helmets use is protection.

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.

Publiceringsår

2014

Språk

Engelska

Publikation/Tidskrift/Serie

International Cycling Safety Conference 2014

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