Document ID: chunk:federal_register_of_legislation:F2018C00339:body:0:p16
Version: federal_register_of_legislation:F2018C00339
Segment Type: other
Provision Reference: 
Character Range: 46703–49862

by

            where:

            e  is the value of   'E'

            C is the ratio of output Signal Level to 'Control Signal' strength for the 'Control System' for the 'Axle' concerned

            T  is the 'Brakes' output torque per unit input signal to the 'Brakes' actuator from output of the 'Control System' for the 'Axle' concerned.

            R is the rolling radius of the tyre on the wheel

            P is the static load on the 'Axle' concerned

            1, 2, etc are subscripts referring to the concerned 'Axle'.

         'Total Trailer Axle Load' in tonnes with the trailer loaded as specified in clause 9.6

17.                                      SERVICE BRAKE FADE CALCULATION
17.1.                                The 'Service Brake System' will be considered to have sufficient brake fade resistance to meet the requirements of this rule if the 'Gross Axle Load Rating' of each 'Foundation Brake' rated according to the fade test in clause 21.3.6 is greater than the 'Gross Trailer Mass' multiplied by the percentage of total brake torque provided by that  'Foundation Brake' for at least one 'Control Signal' level necessary to produce a calculated 'Established Retardation Coefficient' of not less than 0.45 under the Service Brake test Conditions described in part 10 without prior fade conditioning stops.
18.                                      EMERGENCY BRAKE SYSTEM CALCULATION.
18.1.                                The 'Established Retardation Coefficient' for the 'Emergency Brake System' must be determined by computing the total braking force (kN) at the wheels to which emergency brakes are fitted and dividing by [9.81  'Gross Trailer Mass' (tonnes)].
18.2.                                The braking force at each 'Axle' must be calculated according to

            where:

            F is the tangential force at the braked wheels on the 'Axle' concerned

            A is the input to the emergency brakes actuator in units of 'E'

            T is the 'Brakes' output torque per 1.0 'E' for the 'Emergency Brake System'

            R is the rolling radius of the tyre fitted to the wheel.

18.2.1.                          Where the actuating force is dependent on the stroke, as in the case of spring brakes, the value of A used in the equation above must be that corresponding to the 'Brakes' actuator stroke achieved by the 'Emergency Brake System' This can be determined by plotting on a graph of  'Control Signal' versus stroke as detailed in clauses 18.2.2 and 18.2.3:
18.2.2.                          The input to the emergency brakes actuator in units of 'E' from the data provided for the 'Control System' at various strokes; and
18.2.3.                          The 'Foundation Brake' stroke achieved at various  'Control System' inputs.
19.                                      PARKING BRAKE CALCULATION
19.1.                                The gradient, expressed as a percentage, on which the 'Parking Brake System 38/...' can hold the trailer must be determined by computing the total braking force at the wheels (N) to which the 'Parking Brake System 38/...' is fitted and dividing by [98.1