ANNEX
PART II
CHAPTER VIChild/small adult headform to frontal protection system
1.Test purpose
1.1.To test compliance with the requirements laid down in paragraph 3.1.4 of Annex I to Directive 2005/66/EC.
2.Test points
2.1.Test points for the child/small adult headform impactor must be chosen on parts of the frontal protection system where the frontal protection system wrap around distance exceeds 900 mm with the vehicle in its normal ride attitude or with the frontal protection system mounted on a test frame representing the vehicle to which it is to be fitted as if in its' normal ride attitude.
2.2.Three headform impact tests must be carried out at positions which are judged by the test laboratories to be the most likely to cause injury. Tests must be to different types of structure, where these vary throughout the area to be assessed. Points tested by the test authorities must be indicated in the test report.
3.Test apparatus
3.1.The impactor must be as described in Section 5 and as shown in Figure 15.
3.2.The instrumentation response value CFC, as defined in ISO 6487:2000, must be 1 000. The CAC response value, as defined in ISO 6487:2000, must be 500 g for the acceleration.
3.3.The impactor must meet the performance requirements specified in Section 4 of Appendix I. The certified impactor may be used for a maximum of 20 impacts before re-certification. The impactor must be re-certified if more than one year has elapsed since the previous certification or if any transducer output, in any impact, has exceeded the specified CAC.
3.4.The impactor must be mounted, propelled and released as specified in Section 2 of Chapter II.
4.Test procedure
4.1.The stabilised temperature of the test apparatus and the vehicle or separate technical unit must be 20° ± 4 °C.
4.2.Tests must be made to the frontal protection system at positions selected under Section 2.
4.3.A child/small adult headform impactor, as described in Section 5, must be used for tests to the frontal protection system at positions of first contact as selected under Section 2.
4.4.The direction of impact must be downward and rearward and in a vertical plane parallel to the longitudinal axis of the frontal protection system as mounted on the vehicle or the test frame. The tolerance for this direction is ± 2°. The angle of impact for tests with the impactor must be 50° ± 2 ° to the ground reference level. The effect of gravity must be taken into account when the impact angle is obtained from measurements taken before the time of first contact.
4.5.At the time of first contact, the point of first contact of the impactor must be within a ± 10 mm tolerance to the selected impact point.
4.6.The impact velocity of the impactor when striking the impact position must be 9,7 ± 0,2 m/s. The effect of gravity must be taken into account when the impact velocity is obtained from measurements taken before the time of first contact.
5.Headform impactor
5.1.The child/small adult headform impactor is a sphere made of aluminium and of homogenous construction. It shall have a diameter of 165 ± 1 mm and a mass of 3,5 ± 0,07 kg
5.2.The sphere must be covered with a 14 ± 0,5 mm thick synthetic skin, which shall cover at least half of the sphere.
5.3.The centre of gravity of the impactor, including instrumentation, must be located in the centre of the sphere with a tolerance of ± 5 mm. The moment of inertia about an axis through the centre of gravity and perpendicular to the direction of impact must be 0,010 ± 0,0020 kg/m2.
5.4.
A recess in the sphere must allow for mounting one tri-axial or three uni-axial accelerometers. The accelerometers must be positioned in accordance with paragraphs 5.4.1 and 5.4.2.
