Document ID: chunk:federal_register_of_legislation:F2012C00535:front:0:p22
Version: federal_register_of_legislation:F2012C00535
Segment Type: other
Provision Reference: 
Character Range: 61480–64153

masses of a bay shall have the same transverse position inside the bay as the bay's centre of gravity (see figureA4.4):

           where:

           yk  =  the distance of the kth mass component of the bay from the axis "Z" (see figure A4.4).

           yk  will have a positive value on one side of the axis and a negative value on the other side.

           zk  =  the distance of the kth mass component of the bay from the axis "Y",

           zk  will have a positive value on one side of the axis and a negative value on the other side.

       4.3. In the case where occupant restraints are part of the vehicle specification, the occupant mass attributed to a bay shall be attached to that part of the superstructure which is designed to absorb seat and occupant loadings.

    Figure A4.4 - Distribution of mass in the cross section of a bay

       Annex 5

ROLLOVER TEST AS THE BASIC APPROVAL METHOD

       1. The tilting bench

       1.1. The tilting platform shall be sufficiently rigid and the rotation sufficiently controlled to ensure simultaneous lifting of the axles of the vehicle with a difference of less than 1o in the platform's tilt angles measured below the axles.

       1.2. The height difference between the horizontal lower plane of the ditch (see figure.A5.1) and the plane of the tilting platform on which the bus is standing, shall be 800  20 mm.

       1.3. The tilting platform, related to the ditch, shall be placed as follows (see figure A5.1):

       1.3.1. the axis of its rotation is max 100 mm from the vertical wall of the ditch;

       1.3.2. the axis of the rotation is max 100 mm below the plane of the horizontal tilting platform.

Figure A5.1 - Geometry of the tilting bench

       1.4. Wheel supports shall be applied at the wheels being close to the axis of rotation against sliding of the vehicle sideways when tilting it.  The main characteristics of the wheel supports (see figure A5.1) shall be:

1.4.1. dimensions of the wheel support:

                 height shall not be greater than two-thirds of the distance between the surface on which the vehicle stands before it is tilted and part of the rim of the wheel which is nearest to the surface
width   20 mm
edge radius   10 mm
length   500 mm minimum;

       1.4.2. the wheel supports at the widest axle shall be placed on the tilting platform so that the side of the tyre is at maximum 100 mm from the axis of rotation;

       1.4.3. the wheel supports at the other axles shall be adjusted so that the vertical longitudinal centre plane (VLCP) of the vehicle shall be parallel to the axis of rotation.

       1.5. The tilting platform shall be