Rolling resistance is the gross vehicle weight in lbs, times the rolling resistance of the surface divided by 1000.
Where:
RR = Road rolling resistance in pounds
GVW = Gross vehicle weight in pounds
R = Rolling resistance in pounds per thousand pounds vehicle weight
1000 = A constant to determine number of thousand pounds in vehicle
Example:
What is the rolling resistance of a vehicle have a gross weight of 10,000
pounds on poor asphalt
Many formulas are arranged to use the rolling resistance in the above table as a factor. To set the table data up in factor form divide the resistance in lbs by 1000.
Where:
Q = Rolling resistance factor per pound of gross vehicle weight
R = Rolling resistance in pounds per thousand vehicle weight.
Example:
What is the rolling resistance factor per pound of gross vehicle weight
on poor concrete?
Another method
of expressing road rolling resistance is percent of grade. To express
rolling resistance in percent of grade multiply rolling resistance per
thousand pounds vehicle by 100 and divide by
1000.
Where:
RR% Grade = Road rolling resistance in percent of grade
R = Rolling resistance pounds per thousand pounds vehicle weight
100 = A constant to express percent
Example:
What is the road rolling resistance expressed in percent of grade of a
vehicle on poor concrete?
Rolling resistance in newton per hundred kilograms is the gross vehicle weight in kg, times the rolling resistance of the surface divided by 100.
Where:
RR = Road rolling resistance in newtons
GVW = Gross vehicle weight in kilograms
R = Rolling resistance in newtons per hundred kilograms vehicle weight
100 = A constant to determine number of 100 kg in vehicle
Example:
What is the rolling resistance of a vehicle have a gross weight of 4,500
kg on poor asphalt
Many formulae are arranged to use the rolling resistance in the table below as a factor. To set the table data up in factor form divide the resistance in newtons by 100.
Where:
Q = Rolling resistance factor per kilogram of gross vehicle weight
R = Rolling resistance in newtons per hundred kilograms vehicle weight.
Example:
What is the rolling resistance factor per kilogram of gross vehicle weight
on poor concrete?
Another method of expressing road rolling resistance is percent of grade. To express rolling resistance in percent of grade multiply rolling resistance per hundred kilograms vehicle by 100 and divide by 1000.
Where:
RR% Grade = Road rolling resistance in percent of grade
R = Rolling resistance newtons per hundred kilograms vehicle weight
100 = A constant to express percent
1000 = 10 * 100, where 10 is an approximation for acceleration due to
gravity
Example:
What is the road rolling resistance expressed in percent of grade of a
vehicle on poor concrete?
