Document ID: chunk:federal_register_of_legislation:F2012C00535:front:0:p33
Version: federal_register_of_legislation:F2012C00535
Segment Type: other
Provision Reference: 
Character Range: 90304–93319

the load application plane may, in addition to parallel translation, be allowed to  rotate around the axis of intersection of the load application plane with the transverse  plane containing the centre of gravity, in order to follow the asymmetric deformation of the superstructure.

       2.2.6. the passive (supporting) forces shall be applied on the rigid underfloor structure causing no influence on the structural deformation.

Figure A8. 2 - Load application to the superstructure

       2.3. The algorithm of the calculation and the computer program shall meet the following requirements:

       2.3.1. the program shall take account of non-linearities in the PH characteristics and large scale structural deformations.

       2.3.2. the program shall accommodate the working range of PH's and PZ's and shall stop the calculation if the deformation of  PH's exceeds the validated working range (see Appendix 1 of this annex).

       2.3.3. the program shall be able to calculate the total energy absorbed by the superstructure at every incremental load step.

       2.3.4. at every incremental load step, the program shall be able to demonstrate the deformed shape of the bays forming the superstructure, and the position of every rigid part which may intrude into the residual space.  The program shall identify the incremental load step at which the residual space is first invaded by any of the rigid structural parts.

       2.3.5. the program shall be able to detect and identify the incremental load step at which overall collapse of the superstructure begins; when the superstructure becomes unstable and deformation continues without an increase of the load.

       3. Evaluation of the calculation

       3.1. The total energy (ET) to be absorbed by the superstructure shall be determined as follows:

    ET = 0.75 M..g .h

       where:

       M  =  Mk the unladen kerb mass of the vehicle, if there are no restraints, or
                 Mt the total effective vehicle mass when occupant restraints are fitted
       G  =  the gravitational constant
           h  =  the vertical movement (in metres) of the vehicle centre of gravity during a rollover test, as determined in Appendix 1 of Annex 7

       3.2. The absorbed energy (Ea) of the superstructure is calculated at the incremental load step at which the residual space is first touched by any of the rigid structural parts.

       3.3. The vehicle type shall be approved if    Ea  ET

       4. Documentation of quasi-static calculation

        The calculation report shall contain the following information:

       4.1. detailed mechanical description of the superstructure containing the location of PZ's and PH's and defining the rigid and elastic parts,

       4.2. data obtained from the tests and the resultant graphs,

       4.3. a statement of whether or not the requirement of paragraph 5.1. of this Regulation are met,

       4.4. identification of the vehicle type and the personnel responsible for the