BS 960:2006 pdf download – Headforms for use in the testing of protective helmets 2.9 vertical transverse plane for a given headform, the vertical plane perpendicular to both the vertical longitudinal plane and the referenceplane and located mid-way between the front and rear extremities of the headform NOTE This corresponds to the coronal plane of the human head. 2.10 basic plane for a given headform, the horizontal plane located at a vertical distance ‘x’ below and parallel to the referenceplane NOTE This corresponds to the basic plane of the human head being the longitudinal plane which passes through the lowerlevel of the eye orbits and the upper level of the external opening of the ear canals. 2.11 centre of gravity of the three-quarter headformpoint A for a given headform, the point on the central vertical axis located at a vertical distance 12,7mm above thereference plane 2.12 centre of gravity of the full headformpoint G for a given headform, the point on the central vertical axis located at a vertical distance ‘z’ below the referenceplane,as given in Table 1 2.13 geometric centrepoint R for a given headform, the point on the central vertical axis, located at its intersection with the reference plane NOTE This point is the datum for all the dimensions given in Annex A. 3Requirements 3.1 Materials and general characteristics 3.1.1 Headforms for shock absorption and penetration tests, with falling headform/helmet assembly The headforms shall be made of metal and,together with any means for their support,shall exhibit noresonance below a frequency of 2 000 Hz. Full headforms shall have the following characteristics: a)the centre of gravity shall be located within a 10 mm radius of point G on the central vertical axis; b)a facility for attaching an accelerometer shall be incorporated such that, with the headform in any angularorientation, the respective sensitive axes of the accelerometer shall pass within 10 mm of point G; c)the appropriate mass, if specified in Table 1. Three-quarter headforms shall have the following characteristics: i)the centre of gravity shall be located within a 10 mm radius of point A on the central vertical axis; i)a facility for attaching an accelerometer shall be incorporated within the headform or its means ofsupport,such that,with the headform in any angular orientation,the respective sensitive axes of theaccelerometer shall pass within 10 mm of point A. NOTE1 For this type of test,full and three-quarter headforms may be specified in the...

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