Methode ter Bepaling van de Buitenoppervlakte van een Helm (Method to Determine the Outer Surface Area of a Helmet).
PRINS MAURITS LABORATORIUM TNO RIJSWIJK (NETHERLANDS)
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The project within the DMKL for the procurement of combat helmets is in the phase that a number of commercially available helmets must be compared on their performances. The surface area of the helmet is an important factor, because after determining the surface area and the mass of the ballistic shell the so-called area density of the material used can be determined. A low quotient of area density and ballistic limit results into a good performance of the material. For objects with an irregular curved surface it is difficult to determine the outside surface area. For the case of a helmet a method is developed whereby a large number of points on the outside surface are being measured. Therefore through the points triangular elements are formed for which the surface area can easily be calculated. By means of these triangular elements the shape of the helmet is approximated and the surface area calculated is systematically to small. A method to correct for this error has been developed. The accuracy of this method is good enough and is -0.9 en 0.5. For a number of commercially available helmets the surface area has been determined and have the results been reported here.
- Numerical Mathematics
- Test Facilities, Equipment and Methods
- Protective Equipment