7. Machine Performance Parameters

Try these first

1. 1.

   Define required power in the context of earthmoving operations.

   Hint

   Think about what the machine needs to do in order to move.

2. 2.

   What type of resistance is faced by wheels rolling over a surface?

   Hint

   It relates to the friction between the wheel and the surface.

3. 3.

   What is required power?

   • Power needed for project completion
   • Power needed to overcome resistive forces
   • Total engine power available

   Hint

   Consider the factors involved in movement.

4. 4.

   Rolling resistance affects the cost of operation.

   • True
   • False

   Hint

   Think about how power impacts costs.

5. 5.

   A loader with a gross weight of 30,000 kg experiences a rolling resistance of 50 kg per ton when unloading materials from a construction site for a distance of 500 meters. Calculate the tractive effort required.

   Hint

   Use the total weight multiplied by the rolling resistance value.

6. 6.

   If a typical truck tire sinks into a soft surface causing an additional resistance of 10 kg per ton for each inch of penetration, how would you adjust your required power estimation knowing the load is 25 tons and the tire sinks by 6 inches?

   Hint

   Calculate the total resistance by considering all factors.