For trucks travelling in the same direction, which is the closest? When a truck is on a downhill slope, the model takes the maximum mechanical speed from this database according to the actual truck weight and actual effective grade of the road. Sample format of simple business plan. Table 19 shows an AHS improvement in production of about The scale of automation depends on many factors, but it is apparent that operations at all levels of mining are exploring ways to increase efficiency, safety, and production Mullard, et al.

Essay on bomb blast in karachi. The study indicated that short breaks did not alleviate fatigue issues because short breaks only give a temporary relief from body fatigue such as drowsiness. Travelling fully-loaded at 15 kph and 45? Blocks Used in the Model AFmax and AF t? Automated technologies are being applied today in both large-scale industrial mines as well as small-scale mining operations.

Note that delays for lunch and coffee breaks are not constant in the model. Through automation, benchmarked product-quality and quantity improvements can be achieved, employee safety can be improved, costs can be reduced, and product-delivery performance increased.

Safety distance between trucks. The rimpull-speed curve of the manufacture was input to the model by approximating this curve into 12 straight lines Appendix 5.

juliana parreira thesis

The total speed is 31 kph and the minimal of the steady state range is 28 kph. The model calculates acceleration in a deterministic way for each time step.

juliana parreira thesis

The higher efficiency of the gear range is chosen as the gear efficiency which in this case is On the other hand, with the AHS fleet set to normal with a low variation, the cycle time actually declines by about 4 minutes. When Truck 1 reaches its critical juliaa, its deceleration is recalculated as described above. For example, at the Lucy mine the average tire life is about 5, operating hours.


Juliana parreira thesis

AHS truck running at default speed. When precipitation is none. Trucks must make a full stop at an intersection before entering this segment. Coefficients of V2 and V in the equations for wear juluana vs.

Juliana parreira thesis

In communities where automation is being implemented, often there are cultural barriers and fears related to the idea that an automated process will result in fewer jobs for the community. The speed limit on the main haulage segments is 40 kph. Instead the model was changed to consider only two attributes? After a truck reaches the shovel queue, it waits for the shovel and the model stochastically selects values for spotting and loading times based on a probabilistic distribution that represents data from Lucy mine.

Such a driver exhibits either a degree of aggressiveness or a degree of passivity. The time to decline from this value back down to ambient conditions is a bit longer at about 90 minutes.

The effect of speed and load on tire temperature change Every time a truck enters a segment, the rules are fired and the rolling resistance and traction coefficient are applied.

Appendix 3 explains the 14 blocks used in the model. Using autonomous haulage trucks improves safety, maintenance and equipment life, optimizes fuel consumption, and provides streamlined operations with increasingly accurate production systems. These calculations loop until the truck reaches the end of the segment See Appendix 9 for motion vehicle flowchart. As such, the change is dramatic and can be traumatic.

Essay on umbrella for class 1. Regarding emotional behaviour anger, neutral, and excitationCai et al explain that a neutral emotion state thesiss usually present while driving. Maintenance assumptions in the model have held delay times due to repairs in the AHS system relatively close to those measured for the manual model. The model assumes two working loaders shovelsone digging waste and the other assigned to ore production. Although AHS trucks drive slower than normal drivers, the cycle time is shorter than manual because manual breaks involve assembling at the parking lot for safety purposes.


As temperature increases at a constant speed, the load on the tire leads to an increased contribution to tire wear.

An Arrhenius equation has been applied to each coefficient to represent the “activation energy” required to wear rubber from a tire. However, the CAT tire is much wider than a regular tire so that must be accounted for as well. The truck on the right sees the other two jkliana, because the middle truck is 50 metres away, the right truck sets to the middle truck speed.

These limits were provided during a visit to the mine site in The first case compare 7, 8, 9 and 10 trucks oarreira the same speed parameter of the base case for both manual and AHS, the Table 20 shows the results.