This article describes the design and development of a system that is capable of quantifying the thermal comfort of bicycle helmets. The motivation for the development of the system stems from the desire both to increase helmet use and to provide the designer with a quantitative method of evaluating the thermal comfort of a helmet. The system consists of a heated mannequin head form, a heated reference sphere, a small wind tunnel, and a data acquisition system. Both the head form and the reference sphere were instrumented with thermocouples. The system is capable of simulating riding speeds ranging from 4.5–15.5 m/s. A cooling effectiveness, C1, that is independent of both ambient conditions and wind velocity is defined as a measure of how well the helmet ventilates as compared to the reference sphere. The system was validated by testing six commercially available bicycle helmets manufactured between approximately 1992 and 1998. [S0148-0731(00)02304-9]

Issue Section:
Technical Briefs
Keywords:
cooling, biothermics, data acquisition, thermocouples, biological techniques, Sports, Bicycle, Helmet, Thermal, Comfort, Mannequin
Topics:
Bicycles, Cooling, Thermocouples, Wind velocity, Design, Temperature, Wind tunnels
1.
Tan, C., 1995, “Pedestrian and Bicycle Crash Types of the Early 1990’s,” U.S. Department of Transportation, Publication No. FHWA-RD-95-163.
2.
Sheffield-Moore
,
M.
,
Short
,
K. R.
,
Kerr
,
C. G.
,
Parcell
,
A. C.
,
Bolster
,
D. R.
, and
Costill
,
D. L.
,
1997
, “
Thermoregulatory Responses to Cycling With and Without a Helmet
,”
Med. Sci. Sports Exercise
,
29
, pp.
755
–
761
.
3.
John
,
D.
, and
Dawson
,
B.
,
1989
, “
The Effects of Wearing Two Different Cycling Helmets on Thermoregulatory Responses to Prolonged Submaximal Exercise in Hot, Dry Conditions
,”
J. Human Move. Stud.
,
16
, pp.
203
–
214
.
4.
Gisolfi
,
C. V.
,
Rohlf
,
D. P.
,
Navarude
,
S. N.
,
Hayes
,
C. L.
, and
Sayeed
,
S. A.
,
1988
, “
Effects of Wearing a Helmet on Thermal Balance While Cycling in the Heat
,”
Phys. Sportsmed.
,
16
, pp.
139
–
146
.
5.
Osczevski, R. J., 1996, “Design and Evaluation of a Three-Zone Thermal Manikin Head,” Defence and Civil Institute of Environmental Medicine (DCIEM) publication No. 96-R-60, North York.
6.
Boutcher
,
S.
,
Maw
,
G.
, and
Taylor
,
N.
,
1995
, “
Forehead Skin Temperature and Thermal Sensation During Exercise in Cool and Thermoneutral Environments
,”
Aviation, Space, Environ. Med.
,
66
, pp.
1058
–
1062
.
7.
Consumer Reports, 1997, “A Better Bike Helmet,” Consum. Rep., 62, p. 9.
8.
Consumer Reports, 1997, “Bad Breaks,” Consum. Rep., 62, pp. 32–35.
9.
Consumer Reports, 1994, “Bicycle Helmets,” Consum. Rep., 59, pp. 518–522.
10.
Liang, D., Lui, D., and Park, K., 1994, “Bicycle Helmet Ventilation Test Fixture,” unpublished technical report, Department of Mechanical Engineering, Stanford University, Stanford, CA.
11.
Mehta
,
R. D.
, and
Bradshaw
,
P.
,
1979
, “
Design Rules for Small Low Speed Wind Tunnels
,”
Aeronaut. J.
,
83
, pp.
443
–
449
.
12.
Vardeman, S. B., 1994, Statistics for Engineering Problem Solving, PWS, Boston.
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