Chapter 14 - - Equipment Productivity Part II(1)

Chapter 14 - - Equipment Productivity Part II(1) - CE...

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CE 222/CEM 201 Life Cycle Engineering and Management of Constructed Facilities Equipment Productivity Chapter 14 Part II 1
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Learning Objectives Define and Calculate rolling resistance (RR) and grade resistance (GR) Calculate the required power Determine gear and maximum travel speed via tables and nomographs matching required and available power Estimate travel time via time-distance charts Calculate usable power Develop measures for overcoming the situation of usable power<required power Determine equipment balance
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Power Available Controlled by the engine size and the drive train A function of the gear being used. High gear = less power available Higher gears deliver higher speeds Lower gears lower speeds higher power Manufacturers publish figures regarding power available in each gear. (Table 14.4 and Figure 14.5)
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Power Available (cont’d) Tracked vehicles: the power available is quoted in drawbar pull the force can be delivered at the pulling point (e.g., pulling hitch) in a given gear for a given tractor type Wheeled vehicles: the power available is stated in pounds of rimpull the force that can be develped by the wheel at its point of contact with the road surface Rated Power Maximum Power Rated Power: the level of power in a given gear under normal load and over extended work periods Maximum Power: the peak power developed in a gear for a short period of time to meet extraordinary power requirements Most calculations use rated power.
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