Common use of Head Performance Criterion Clause in Contracts

Head Performance Criterion. (HPC) 1.1. This criterion is considered to be satisfied when, during the test, there is no contact between the head and any vehicle component. 1.2. If that is not the case, a calculation of the value of HPC is made, on the basis of the acceleration (a),1 by the following expression: in which: 1.2.1. the term "a" is the resultant acceleration is measured in units of gravity, g (1 g = 9,81 m/s2); 1.2.2. if the beginning of the head contact can be determined satisfactorily, t1 and t2 are the two time instants, expressed in seconds, defining an interval between the beginning of the head contact and the end of the recording for which the value of HPC is maximum; 1.2.3. if the beginning of the head contact cannot be determined, t1 and t2 are the two time instants, expressed in seconds, defining a time interval between the beginning and the end of the recording for which the value of HPC is maximum; 1.2.4. values of HPC for which the time interval (t1 - t2) is greater than 36 15 ms are ignored for the purposes of calculating the maximum value. 1.3. The value of the resultant head acceleration during forward impact which is exceeded for 3 ms cumulatively is calculated from the resultant head acceleration.2 When All latral dimensions are measured under a contact force of 50 N with the device described in figure 2 of this annex and the following tolerances will be applied to the dimensions: Minimum Sitting height: - from 40 up to 87 cm B - 5 per centile - from stature from 87 cm and up 150 cm B - 10 per centile, Minimum Shoulder breadth: C -0+2 cm Minimum Hip breadth: D -0+2 cm Minimum Shoulder height (5 per centile): E1 -2+0 cm Maximum shoulder height (95 per centile): E2 -0+2 cm The mass of the device described in Figure 2 of this annex shall be 10 kg +/- 1 kg Notes: Hb: Hip Breadth variable from 140 to 380 mm Scb : Shoulder Breadth variable from 120 to 400 mm Sih : Sitting height variable from 400 to 800 mm Shh : Shoulder height variable from 270 to 540 mm Key: 1. Child Restraint Fixture (CRF). 2. ISOFIX low anchorages bar. 3. Plane formed by the bottom surface of the CRF, which is parallel to and 15 mm below the X'-Y' plane of the coordinate system. 4. Z'-Y' plane of the coordinate system. 5. Upper part of the support-leg dimension assessment volume, which shows the dimensional limitations in X' and Y' direction, the upper height limit in Z' direction, as well as the lower height limitation in Z' direction for rigid, not in Z' direction adjustable support leg components. Notes: 1. Drawing not to scale. Note: 1. Drawing not to scale. Key:

Head Performance Criterion. (HPC) 1.1. This criterion is considered to be satisfied when, during the test, there is no contact between the head and any vehicle component. 1.2. If that is not the case, a calculation of the value of HPC is made, on the basis of the acceleration (a),1 by the following expression: in which: 1.2.1. the term "a" is the resultant acceleration is measured in units of gravity, g (1 g = 9,81 m/s2); 1.2.2. if the beginning of the head contact can be determined satisfactorily, t1 and t2 are the two time instants, expressed in seconds, defining an interval between the beginning of the head contact and the end of the recording for which the value of HPC is maximum; 1.2.3. if the beginning of the head contact cannot be determined, t1 and t2 are the two time instants, expressed in seconds, defining a time interval between the beginning and the end of the recording for which the value of HPC is maximum; 1.2.4. values of HPC for which the time interval (t1 - t2) is greater than 36 15 ms are ignored for the purposes of calculating the maximum value. 1.3. The value of the resultant head acceleration during forward impact which is exceeded for 3 ms cumulatively is calculated from the resultant head acceleration.2 When All latral lateral dimensions are measured under a contact force of 50 N with the device described in figure 2 of this annex and the following tolerances will be applied to the dimensions: Minimum Sitting height: - from 40 up to 87 cm B - 5 per centile - from stature from 87 cm and up 150 cm B - 10 per centile, Minimum Shoulder breadth: C -0+2 cm Minimum Hip breadth: D -0+2 cm Minimum Shoulder height (5 per centile): E1 -2+0 cm Maximum shoulder height (95 per centile): E2 -0+2 cm The mass of the device described in Figure 2 of this annex shall be 10 kg +/- 1 kg All dimensions in mm Notes: Hb: Hip Breadth variable from 140 to 380 mm Scb : Shoulder Breadth variable from 120 to 400 mm Sih : Sitting height variable from 400 to 800 mm Shh : Shoulder height variable from 270 to 540 mm Key: 1. Child Restraint Fixture (CRF). 2. ISOFIX low anchorages bar. 3. Plane formed by the bottom surface of the CRF, which is parallel to and 15 mm below the X'-Y' plane of the coordinate system. 4. Z'-Y' plane of the coordinate system. 5. Upper part of the support-leg dimension assessment volume, which shows the dimensional limitations in X' and Y' direction, the upper height limit in Z' direction, as well as the lower height limitation in Z' direction for rigid, not in Z' direction adjustable support leg components. Notes: 1. Drawing not to scale. Note: 1. Drawing not to scale. Key: