Commission Regulation (EC) No 631/2009Show full title

CHAPTER IV U.K. Upper legform to bonnet leading edge test

1. Scope U.K.

This test procedure shall apply to the requirements set out in points 2.2 and 3.2 of Annex I to Regulation (EC) No 78/2009.

2. General U.K.

2.1. The upper legform impactor for the bonnet leading edge test shall be mounted to the propulsion system, by a torque limiting joint, to prevent large off centre loads damaging the guidance system. The guidance system shall be fitted with low friction guides, insensitive to off-axis loading, that allow the impactor to move only in the specified direction of impact, when in contact with the vehicle. The guides shall prevent motion in other directions including rotation about any axis. U.K.

2.2. The impactor may be propelled by an air, spring or hydraulic gun, or by other means that can be shown to give the same result. U.K.

3. Specification of the test U.K.

3.1. The purpose of the test is to ensure that the requirements set out in points 2.2 and 3.2 of Annex I to Regulation (EC) No 78/2009 are fulfilled. U.K.

3.2. A minimum of three upper legform to bonnet leading edge tests shall be carried out, one each to the middle and the outer thirds of the bonnet leading edge at positions judged to be the most likely to cause injury. However, the test point in each third shall be selected such that the required kinetic energy of impact, determined in point 4.8, exceeds 200 J, if such a point is available. The tests shall be performed to different types of structure, where they vary throughout the area to be assessed. The selected test points shall be a minimum of 150 mm apart, and a minimum of 75 mm inside the defined corner reference points. These minimum distances are to be set with a flexible tape held tautly along the outer surface of the vehicle. The positions tested by the laboratories shall be indicated in the test report. U.K.

3.3. All standard equipment fitted to the front end of the vehicle shall be in position. U.K.

4. Test procedure U.K.

4.1.

The state of the vehicle or subsystem shall comply with the requirements of Chapter I. U.K.

4.1.1. The test impactor or at least the foam flesh shall be stored during a period of at least four hours in a controlled storage area with a stabilised humidity of 35 percent ±15 percent and a stabilised temperature of 20 ± 4 °C prior to impactor removal for testing. After removal from the storage the impactor shall not be subjected to conditions other than those existing in the test area. U.K.

4.1.2. Each test shall be completed within two hours of when the impactor to be used is removed from the controlled storage area. U.K.

4.2. The upper legform impactor to be used for the purposes of this test shall be the one as described in Section 2 of Part V. U.K.

4.3. The upper legform impactor shall be mounted and propelled as set out in points 2.1 and 2.2. U.K.

4.4. The upper legform impactor shall be aligned such that the centre line of the propulsion system and the longitudinal axis of the impactor are parallel to the longitudinal vertical plane of the vehicle to be tested. The tolerances to these directions are ±2°. At the time of first contact the impactor centre line shall be coincident with the bonnet leading edge reference line with a ±10 mm tolerance (see Figure 3), and laterally with the selected impact location with a tolerance of ±10 mm. U.K.

4.5. The required impact velocity, the direction of impact and the upper legform impactor mass shall be determined as specified in points 4.7 and 4.8. The tolerance to the impact velocity is ± 2 % and the tolerance to the impact direction is ± 2°. The effect of gravity shall be taken into account when the impact velocity is obtained from measurements taken before the time of first contact. The upper legform impactor mass shall be measured to an accuracy of better than ± 1 %, and if the measured value differs from the required value then the required velocity shall be adjusted to compensate, as specified in point 4.8. U.K.

4.6.

Determination of vehicle shape: U.K.

4.6.1. The position of the upper bumper reference line shall be determined as defined in Part I. U.K.

4.6.2. The bonnet leading edge reference line shall be determined as defined in Part I. U.K.

4.6.3. For the section of bonnet leading edge to be tested the bonnet leading edge height and the bumper lead shall be determined as defined in Part I. U.K.

4.7. The required impact velocity and the direction of impact shall be determined from Figures 4 and 5 with reference to the values of bonnet leading edge height and bumper lead determined in point 4.6.3. U.K.

4.8. The total mass of the upper legform impactor includes those propulsion and guidance components which are effectively part of the impactor during the impact, including the extra weights. U.K.

Calculate the value of the upper legform impactor mass from:

M = 2E / V²

Where:

M

=

Mass [kg]

E

=

Impact Energy [J]

V

=

Velocity [m/s].

The required velocity shall be the value derived under point 4.7 and the energy shall be derived from Figure 6 with reference to the values of bonnet leading edge height and bumper lead determined in point 4.6.3.

The upper legform impactor mass may be adjusted from the calculated value by up to ±10 %, provided the required impact velocity is also changed using the above formula to maintain the same impactor kinetic energy.

4.9. Fit the required extra weights to give the calculated value of upper legform impactor mass, determined in point 4.8, to the rear of the rear member of the impactor, or to components of the guidance system which are effectively part of the impactor during the impact. U.K.

Figure 3

Upper legform to bonnet leading edge tests

[X1 Figure 4

Velocity of upper legform to bonnet leading edge tests with respect to vehicle shape]

Notes: U.K.

1.

Interpolate horizontally between curves.

2.

With configurations below 5,56 m/s — test at 5,56 m/s.

3.

With configurations above 11,1 m/s — test at 11,1 m/s.

4.

With negative bumper leads — test as for zero bumper lead.

5.

With bumper leads above 400 mm — test as for 400 mm.

Figure 5

Angle of upper legform to bonnet leading edge tests with respect to vehicle shape

Key: A = 0 mm bumper lead B = 50 mm bumper lead C = 150 mm bumper lead

Notes: 1. Interpolate vertically between curves. 2. With negative bumper leads test as for zero bumper lead. 3. With bumper leads above 150 mm test as for 150 mm. 4. With bonnet leading edge heights above 1 050 mm test as for 1 050 mm.

Figure 6

Kinetic energy of upper legform to bonnet leading edge tests with respect to vehicle shape

Key: A = 50 mm bumper lead B = 100 mm bumper lead C = 150 mm bumper lead D = 250 mm bumper lead E = 350 mm bumper lead

Notes 1. Interpolate vertically between curves. 2. With bumper leads below 50 mm test as for 50 mm. 3. With bonnet leading edge heights above 1 050 mm test as for 1 050 mm. 4. With a required kinetic energy above 700 J test at 700 J. 5. With a required kinetic energy equal to or below 200 J no test is required. 6. With bumper leads above 350 mm test as for 350 mm.