# Homework Help: Rimpull and velocity calculations

1. Apr 20, 2007

### maurice6007

1. The problem statement, all variables and given/known data
Manufacturers of mining equipment supply rimpull vs speed curves. I need to be able to calculate rimpull in order to read speed from the graph. Using the graph isn't a problem, but I am trying to put the calculation into a software program that will calculate cycle times for the truck and using the graphs in Delphi are difficult.

2. Relevant equations
Equation I'm currently using:
Rimpull = [(weight of truck)*(grade of road )] + [(weight of truck) * rolling resistance)]

F(result uphill) = (coefficient of rolling resistance)(weight)+(weight(SIN(grade)))

3. The attempt at a solution
I can work out the forces needed to overcome resistance forces by using basic vector diagrams. This supplies me with the resultant forces going uphill or downhill. This force is in Newton, however, and rimpull is described as weight i.e. kg or tonne.

The equation I'm curently using seemed right, at first, but does not compare with controll data and answers.
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution