Question

2018 ENGD2005 De Montfort University 3. An electric motor M drives a flywheel F via the transmission schematically shown in Figure 3. Gears A and B have 30 and 200 teeth, gears C1 and C, have 100 and 25 teeth, and gears D, and Di have 96 and 40 teeth, respectively. The moments of inertia of the system components are following: the motor and gear A is 0.025 kgm, compound C (gears C, C and connecting rod) is 0.015 kgm2, compound D (gears Di, D2 and connecting rod) is 0.020 kgm2 gear B and flywheel F is 0.1 kgm2. All the gears have module of 1mm. The motor develops a constant torque of 3.9 Nm and accelerates the flywheel from rest till rotation rate of 60 rpm in 10 seconds. Determine: (6 marks) 3 marks) (6 marks) d) the equivalent inertia of the gear system referenced to the motor M(5 marks) e) the resistance torque applied to the flywheel by the breaking pads (5 marks) a) the transmission ratio of the gear system b) the direction of the flywheel rotation c) the distance between the motor M and flywheel F axes 4. Crank AB of the slider-crank mechanism shown in Figure 4 rotates at angular speed 900 rpm in clockwise direction. If length of the crank is 10 cm, length of link BC is 30 cm and angle 0-45 a) draw the velocity vector diagram and determine linear velocity of slider C b) find the angular velocity of connecting rod BC: c) draw the acceleration vector diagram and determine acceleration of slider C (10 marks) 5 marks) (10 marks) A. MT Breaking pads C2 C1 Figure 3 Figure 4

Answer 1

: acceleration C9:χ。eV Coi 20. 30cm 2 n rt.' de' C. accelaration o亻

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