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g of 0.4 gear ratio. neter. The Motors a unce from station tw tion during accelen

g of 0.4 gear ratio. neter. The Motors a unce from station tw tion during accelen

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25. A 60 tonnes train unit is made up of a two 4-wheel bogie coaches. Each coach has 2 bogies. Each coach is equipped with 4 DC motors. Each motor is geared to the driving axle through a single- reduction gearing of 0.4 gear ratio. Each wheel and each motor has a mass of 500 kg and a diameter of 1.0 meter. The Motors are required to accelerate and decelerate the train at 1.5 m/sec2. The distance from station to station is 2000 m, and the average speed is 20 m/sec. Resistance to motion during acceleration is assumed 20 N/tonne, and 30 N/tonne during constant speed. Assume track slope 4 %. System regenerative braking is arranged. The accelerating mass of the system is: Q
Transcribed Image Text:25. A 60 tonnes train unit is made up of a two 4-wheel bogie coaches. Each coach has 2 bogies. Each coach is equipped with 4 DC motors. Each motor is geared to the driving axle through a single- reduction gearing of 0.4 gear ratio. Each wheel and each motor has a mass of 500 kg and a diameter of 1.0 meter. The Motors are required to accelerate and decelerate the train at 1.5 m/sec2. The distance from station to station is 2000 m, and the average speed is 20 m/sec. Resistance to motion during acceleration is assumed 20 N/tonne, and 30 N/tonne during constant speed. Assume track slope 4 %. System regenerative braking is arranged. The accelerating mass of the system is: Q
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