Document ID: chunk:federal_register_of_legislation:F2024L01742:body:0:p11
Version: federal_register_of_legislation:F2024L01742
Segment Type: other
Provision Reference: 
Character Range: 32533–36157

clause 9 to be measured.

     4.                               The 'Seats' to be tested must be prepared in accordance with clause 7.2.

     5.                               Any dummy representative of the 50th percentile adult male may be used.  For example, this may be a 'Hybrid II', 'Hybrid III' or a 'TNO 10 Dummy'.

     6.                               One dummy must be placed in each seating position in the rear 'Seat' and must not be restrained.

     7.                               One dummy must be placed in each seating position in the front 'Seat' and must be restrained.

     8.                               The impact simulation specified in clause 7.4 must be used.

 1.                                           ALTERNATIVE TEST PROCEDURE FOR VEHICLE SEAT-ANCHORAGES

     1.                                     Fixing of Test Structure

         1.                               A rigid structure sufficiently representative of the pedestal of the 'Seat Type' must be fixed to the seat-anchorage and sufficient of the vehicle structure by means of fixation (bolts, screws, etc.) provided by the manufacturer.

         2.                               If several 'Seat Types' differing from one another in respect of the distance between the front and back ends of their feet can be mounted on the same seat-anchorage, the test must be carried out with the shortest footing.

     2.                                     Application of Force

         1.                               A force F must be applied, in the manner described in the following clauses.

         2.                               The force F must be applied at a height of 750 mm above the reference plane.

         3.                               The force F must be applied on the vertical line containing the geometrical centre of the surface bounded by the polygon having the extreme seat-anchorage points as apexes, by the rigid structure described in clause 8.1.1, in the horizontal direction and directed to the front of the vehicle.

         4.                               The Force F must:

             1.                         have a force/time graph which entirely encompasses the corresponding force/time graph determined from a test on the 'Seat Type' according to clause 7; or

             2.                         be that force arising from the tests conducted according to Appendix 1.

 1.                                           DETERMINATION OF INJURY CRITERIA

     1.                                     Head Injury Criterion (HIC)

         1.                               This injury criterion (HIC) is calculated on the basis of the resultant tri-axial acceleration measured according to clause 7.6.1 by the equation:

 1.                               For the purposes of this equation, t1 and t2 are any values of time during the test which are not separated by more than a 36 milliseconds time interval, HIC being maximum value for an interval t1, t2.  The value of t1 and t2 are expressed in seconds.

 1.                                     Thorax Injury Criterion (ThIC)

     1.                               This criterion is determined by the absolute value of the resultant acceleration, expressed in m/s2.

     2.                               The criterion is measured according to clause 7.6.2 and by the acceleration period, expressed in ms.

 2.                                     Femur Injury Criterion (FIC)

     1.                               This criterion is determined by the compression force, expressed in kN, transmitted axially