Document ID: chunk:federal_register_of_legislation:F2012C00535:front:0:p31
Version: federal_register_of_legislation:F2012C00535
Segment Type: other
Provision Reference: 
Character Range: 84930–87755

The vertical movement (h) of centre of gravity related to the rollover test may be determined by the graphical method shown below.

       1. Using scaled drawings of the cross-section of the vehicle, the initial height (h1) of the centre of gravity (position 1) above the lower plane of the ditch is determined for  the vehicle standing at its point of unstable equilibrium on the tilting platform (see Figure A7.A1.1).

       2. Using the assumption that the vehicle cross-section rotates around the edge of the wheel supports, (point A in Figure A7.A1.1) the vehicle cross-section is drawn with its cantrail just touching the lower plane of the ditch (see Figure A7.A1.2).  In this position the height (h2) of the centre of gravity (position 2) relative to the lower plane of the ditch is determined.

Figure A7.A1.1 – Initial height of the vehicle centre of gravity

Figure A7.A1.2 - Determination of the vertical movement of the vehicle centre of gravity

3. The vertical movement of the centre of gravity (h) is,

h = h1 – h2

       4. If more than one body sections are tested and each body section has a different vertical movement (h), the vertical movement of centre of gravity (hi) shall be determined for each body section and the combined mean value (h) is taken as,

       where:

       hi  =  the vertical movement of the centre of gravity of the ith body section,
       k        =  the number of body sections tested.

Annex 8

QUASI-STATIC CALCULATION BASED ON TESTING OF COMPONENTS AS AN EQUIVALENT APPROVAL METHOD

1. Additional data and information

        If the manufacturer chooses this test method, the following information shall be given to the technical service, in addition to the data and drawings listed in paragraph 3.2. of this Regulation:

       1.1. The location of plastic zones (PZ) and plastic hinges (PH) in the superstructure;

       1.1.1. all the individual PZ's and PH's shall be uniquely identified on the drawing of the superstructure in their geometrically defined locations (see figure A.8.1.)

       1.1.2. structural elements between the PZ's and PH's can be treated as rigid or elastic parts in the calculation, and their length shall be determined by their actual dimensions in the vehicle.

1.2. The technical parameters of PZ's and PH's;

       1.2.1. the cross-sectional geometry of the structural elements in which the PZ's and PH's are located.

       1.2.2. the type and direction of loading applied to each PZ and PH.

       1.2.3. the load-deformation curve of each PZ and PH as described in appendix 1 of this annex. The manufacturer may use either the static, or the dynamic characteristics of the PZ's and PH's for the calculation but shall not mix static and dynamic characteristics in one calculation.

Figure A8. 1 - Geometrical