CEN TS 1317 – 8

The European Technical Specification CEN TS 1317 – 8

The full-scale impact test consists of launching a dummy at a given speed against a barrier with MPS. At the moment of the impact, the dummy is sliding with its back and legs stably in contact with the ground and shall be equipped with a proper motorcycle helmet and clothes.

Three theoretical approach paths are defined. If the test laboratory judges that the impact point identified in this standard for a given test is not representative of the most severe testing conditions, the impact point may change accordingly.

In the launch configuration 1, the approach path of the dummy is defined by a line, parallel to the ground, passing through the centre (O) of the post section and forming a 30° angle with respect to the centreline of the un-deformed test item. For a continuous system, if the test item is not fitted to a post-and-rail type safety barrier, point ‘O’ shall be the centre of an anchorage, a connection between elements of the test item or any other point deemed to result in the highest severity impact. For a discontinuous system, ‘O’ is the centre of the item onto which the MPS is fitted. This launch configuration is applicable to all types of MPS and, is generally intended to represent the configuration resulting in the most severe impact-related injuries.

Picture 7 – launch configuration one

For the second launch configuration, the approach path of the dummy is defined by a line parallel to the ground and parallel to a line at 30° to the centreline of the un-deformed test item, passing through the point ‘O’ (centre of the post section). The approach path shall be 20 cm upstream of the 30° line passing through ‘O’.

This configuration is only applicable when the test item is a discontinuous system. If the test item is not fitted to a post-and-rail type safety barrier, point ‘O’ shall be the centre of the item onto which the MPS is fitted. The purpose of this configuration is to impact the edge of the discontinuous system which may be potentially aggressive and/or to achieve maximal deceleration of the ATD.

Picture 8 – launch configuration two

The approach path of the dummy in the third launch configuration is defined by a line, parallel to the ground, passing through point ‘I’ (centre of the barrier, see picture 9) and forming a 30° angle with respect to the centreline of the un-deformed test item. ‘I’ is the intersection of the surface in contact with ATD during the test and the perpendicular bisector of the segment joining ‘On’ and ‘On+1’. ‘On’ and ‘On+1’ are the centres of the sections of two consecutive posts of the barrier. If the system is not a post-and-rail type safety barrier, points ‘On’ and ‘On+1’ shall be the centres of two consecutive anchorages or element connections of the test item or any other point deemed to result in the highest severity impact.

This launch configuration is only applicable to continuous systems and is primarily intended to test the robustness of the test item where it is most flexible and to evaluate the potential for the trapping of limbs in the area where this is most likely to occur. However, in some cases, the injury criteria values measured on the ATD may be higher for this configuration than for Configuration 1.

Picture 9 – launch configuration three

Performance and Acceptance Criteria

The performance of an MPS is determined by the speed class, which is determined by the impact speed of the tests performed. The speed can be of 60 or 70 km/h. The performance is also defined by the severity level, which is determined by the level of biomechanical indices obtained from the dummy instrumentation during the test.

A tested MPS which satisfies the requirements of a given speed class will be deemed to comply with the test conditions corresponding to the speed classes of lower speeds, with the same severity levels, unless it contains some mechanism that does not work acceptably at a lower impact speed.

According to the table below, each impact test can be classified in two severity levels (level I and II). The severity level is achieved only when the values of all biomechanical indices are equal to, or less than the corresponding maximum limits.

Severity Level

Maximum Admissible Values

Head

Neck

HIC36

Fx

(N)

Fztension (N)

Fzcompression (N)

Mocx (N.m)

Mocy extension (N.m)

Mocy flex (N.m)

I

650

Graph 1

Graph 2

Graph 3

134

42

190

II

1000

Graph 4

Graph 5

Graph 6

134

57

190

Table 4 – TS 1317-8 biomechanical criteria