A mine vehicle of mass 4.5 tons must be driven at a speed of 20km/h up a slope of 10°. The coefficient of the rolling resistance is 0.1. the vehicle is driven by four hydraulic motors, directly coupled to the wheels. The effective wheel diameter are 800mm. Assume both the overall and the mechanical efficiency of all the motors as well as the pump are 0.92 and assume the maximum drop across the motor as 25Mpa. The speed of the pump is 2000r/min. Assume the drop of pipes, filters, valves etc as 2Mpa. Calculate a) the torque required by each wheel b) the displacement volume of each motor c) the displacement volume of the pump d) the power required by the pump
A mine vehicle of mass 4.5 tons must be driven at a speed of 20km/h up a slope of 10°. The coefficient of the rolling resistance is 0.1. the vehicle is driven by four hydraulic motors, directly coupled to the wheels. The effective wheel diameter are 800mm. Assume both the overall and the mechanical efficiency of all the motors as well as the pump are 0.92 and assume the maximum drop across the motor as 25Mpa. The speed of the pump is 2000r/min. Assume the drop of pipes, filters, valves etc as 2Mpa. Calculate a) the torque required by each wheel b) the displacement volume of each motor c) the displacement volume of the pump d) the power required by the pump
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A mine vehicle of mass 4.5 tons must be driven at a speed of 20km/h up a slope of 10°. The coefficient of the rolling resistance is 0.1. the vehicle is driven by four hydraulic motors, directly coupled to the wheels. The effective wheel diameter are 800mm. Assume both the overall and the mechanical efficiency of all the motors as well as the pump are 0.92 and assume the maximum drop across the motor as 25Mpa. The speed of the pump is 2000r/min. Assume the drop of pipes, filters, valves etc as 2Mpa. Calculate
a) the torque required by each wheel
b) the displacement volume of each motor
c) the displacement volume of the pump
d) the power required by the pump
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