Document ID: chunk:federal_register_of_legislation:F2023C00959:body:0:p17
Version: federal_register_of_legislation:F2023C00959
Segment Type: other
Provision Reference: 
Character Range: 51403–54422

Pendulum Method for a category LEM1, LEP1 or LEG1 vehicle
       3.2.2.                    For category LEM2, LEP2 and LEG2 vehicles:
          (a)      position the vehicle on a level surface;
          (b)      mark a horizontal 'reference line' parallel to the vehicle longitudinal centreline, passing through the centre of the front 'Axle';
          (c)      chock both front wheels;
          (d)      raise the rear of the vehicle until the 'CoM' is directly over the front 'Axle';
          (e)      measure the angle (θ) between the 'reference line' and the horizontal (see Figure 9); and
          (f)       determine the height (h) of the 'CoM' from the formula:
          Where:
             r is the rolling radius of the tyres fitted to the front wheels
             L is the longitudinal location of the 'CoM' from the centreline of the front 'Axle'
          θ is the angle (θ) between the 'reference line' and the horizontal
       Figure 9: Stable Pendulum Method for a category LEM2, LEP2 or LEG2 vehicle
       3.3.                           Axle Lift Method
       3.3.1.                    Category LEM1, LEP1 and LEG1 vehicles
       3.3.1.1                With the suspension blocked to prevent movement and the vehicle in the 'Maximum Loaded Test Mass' condition:
          (a)      use a block (or blocks) to elevate the front wheel by at least 600 mm (see Figure 10);
          (b)      determine the longitudinal location of the 'CoM' in the elevated state (Le), from the centreline of the front 'Axle', using the formula:
          Where (see Figure 10):
             We is the wheelbase in the horizontal plane
             Re is the rear 'Axle Load' on the tyre(s) with the elevated vehicle in the 'Maximum Loaded Test Mass' condition = F + R – Fe
             Fe is the front 'Axle Load' on the tyre(s) with the elevated vehicle in the 'Maximum Loaded Test Mass' condition = F + R – Re
             F is the front 'Axle Load' on the tyre(s) with the vehicle on a level surface in the 'Maximum Loaded Test Mass' condition
             R is the rear 'Axle Load' on the tyre(s) with the vehicle on a level surface in the 'Maximum Loaded Test Mass' condition
          (c)      determine the angle (θ) of inclination from the formula:
          Where (see Figure 10):
             Hfe is the height by which the front wheel is elevated
             We is the wheelbase in the horizontal plane
          (d)      determine the height (h) of the 'CoM' from the formula:
          Where (see Figure 10):
             W is the 'Wheelbase' of the vehicle measured prior to elevation; and
             L is the longitudinal location of the 'CoM' prior to elevation (as determined according to clause 2.2 of this appendix above)
             θ is the angle of inclination
             We is the wheelbase in the horizontal plane
             Le is the longitudinal location of the 'CoM' in the elevated state
             r is the rolling radius of the tyres fitted to the rear wheels
       Figure