Haul Fleet Manager

This command manages the haul trucks that can be used in the Haul Cycle Analysis command. The main dialog of this command is shown below.

24 trucks are included in the program, but it is important to note that the only difference between these trucks is the Load Capacity – no other values are specific to the truck type. Therefore, all truck specifications should be verified before implementing Haul Cycle Analysis.

Model #: This is a customizable name that can be used to identify the truck model
Amount: Haul Cycle Analysis allows you to calculate the potential production from a pre-defined fleet of trucks. Entering this value will determine the fleet to be considered when calculating production based on a given fleet
Loading Spot Time (sec): This is the time in seconds, on average, the truck takes to position itself at the loading point
Loading Time (sec): This is the time in seconds, on average, required to load the truck
Dumping Spot Time (sec): This is the time in seconds, on average, the truck takes to position itself at the dumping point
Dumping Time (sec): This is the time in seconds, on average, the truck requires to dump its load
Load Capacity (Payload): This is the weight of the load the truck will haul

Trucks can be manually added or removed from the Haul Fleet Manager using the green Plus Button or the green Exit button, respectively. Both buttons are shown below.

Individual trucks can also be saved or loaded from a .hrt or .xml file using the green Save button or the Folder button. Both are shown below.

Edit Performance

Selecting a truck and clicking ‘Edit Performance’ will open the dialog shown below.

An explanation of how each of these variables is implemented in the performance of the truck is discussed in more detail in the help documentation of the Haul Cycle Analysis command.

Traction Coefficient: This value determines the force of friction that will act to prevent the truck tires from slipping
Normal Payload: This value is dynamically linked to the Load Capacity of the truck shown on the main dialog of the Haul Fleet Manager; this value is dynamically linked to the Loaded Truck Weight and the Empty Truck Weight
Gross Vehicle Weight: This value is NOT always a simple addition of the weight of the truck and the weight of the load. Instead, it is the intended operating weight of the truck as provided by the truck manufacturer. In many cases, however, the loaded truck weight will match this value
Max. Accel.: This is the maximum allowable acceleration of the truck
Brake Reliance: This is essentially a measure of confidence that can be placed on the defined traction coefficient to slow the truck in braking situations. For example, the default traction coefficient is 0.36 and the default brake reliance is 0.7. If the truck needs to come to an immediate halt, the maximum braking force is determined in part by the traction coefficient. However if you are only 70% confident in the traction of the road, the maximum braking force would be calculated as if the traction coefficient were 0.36*0.7 = 0.252
Driver Perception Response Time (DPRT): This is the usual time it will take for a truck driver to respond to a need to stop. Using the default value as an example, it would take a driver 2.5 seconds to actually press on the brake pedal once a threat presents itself.
Loaded Weight: This is the actual operating weight of the truck when it carries a normal payload
Empty Weight: This is the actual weight of the truck itself; this does not include the weight of the payload
Front Axle Weight Factor: This is the portion of the truck weight that is supported by the front axle
Rear Axle Weight Factor: This is the portion of the truck weight that is supported by the rear axle. This value and the Front Axle Weight Factor should sum to 1.0
Max. Decel.: This is the maximum allowable deceleration of the truck
Brake System Response Time (BSRT): When a truck brake is activated, the full braking force will not be immediately applied; the braking force will instead increase gradually. This value is the delay between the initial depression of the brake pedal and when the full braking force is applied

Edit Resistance

The Resistance Table allows you to enter in the maximum allowable operating speed and duty cycle for a given Total Resistance. This table can be saved to and loaded from a .htr file.This dialog is shown below.

Total Resistance: This is the force that works either for or against the truck’s movement, expressed as a percentage of the truck weight. This is a combination of the grade of the road and the rolling resistance of the tires on the road. For example, a 5% rolling resistance on an uphill slope of 7% would equate to a total resistance of 12%
Duty Cycle: This is used to measure the fuel consumption of the truck
Operating Speed: This is the maximum allowable speed of the truck. Unless another constraint requires the truck to move at a slower speed, the truck will accelerate until it reaches this speed

Rimpull Force

This table provides information on the rimpull force that will be exerted to maintain various speeds of the truck at normal operating conditions.

This information will be used when calculating the acceleration of the truck for various conditions. This table can be saved to and loaded from a .htp file.

Downgrade Table

This table allows you to set speed limits for both loaded and empty hauling conditions on downhill segments. The downgrade is the slope of the road expressed as a percentage. The dialog is shown below:

This table can be saved to and loaded from a .tdt file.

Thank you to the late Peter Nahan of Goldcorp for his suggestions, references and help in developing this command.

Pull-Down Menu Location: Reserves/Timing in Surface Mining
Keyboard Command: haul_fleet