Ashaft fitted with a flywheel rotates at 300 rpm. and drives a machine. The torque required to drive the machine varies in a cyclic manner over a period of 2 revolutions. The torque drops from 20,000 Nm to 10,000 Nm uniformly during 90 degrees and remains constant for the following 180 degrees. It then rises uniformly to 35,000 Nm during the next 225 degrees and after that it drops to 20,000 in a uniform manner for 225 degrees, the cycle being repeated thereafter. Determine the power required to drive the machine and percentage fluctuation in speed, if the driving torque applied to the shaft is constant and the mass of the flywheel is 12 tonnes with radius of gyration of 500 mm. What is the maximum angular acceleration of the flywheel. 35,000 TNM 20,000 10,000 0 90 270 495 Crank angle 8 degrees 720

The max speed for the servo shown is 130RPM when connected to 6V. Assume that the gearbox on your servo is able to output a torque of 1.5 kg-cm while turning at this speed. Using the number of teeth on each gearprovided in the table, determine the torque and rotational speed of the output shaft on the DC motor. HINT: Work backwards from the output shaft and use the equations developed in class that relate the number of teeth to the torque. When working back from the output shaft to gear 7/6, realize that the “torque” transmitted by gear 7 is the SAME as the torque transmitted by gear 6 since they are joined. Then, relate the torque of gear 6 to gear 5 based on their numbers of teeth. Since gears 5 and 4 are actually one piece, the torque in 4 and 5 will be the same (as was the case for gears 6 and 7). Repeat for the other gears, working your way all the way back to the DC motor.

Consider the gear/pulley mechanism shown below (top view). The gear on the lower left is driven at a speed of 5 deg/s. The radii and lengths are indicated. Determine (a) the rate at which the rod is rotating in deg/s, (b) the direction of the rotation (CW or CCW), and (c) the speed of the tip (mm/s). 5 deg/s 50 mm 200 mm 75 mm 300 mm 300 mm. 100 mm. Tip 280 mm 150 mm.

Please solve question 4 & 5

2. A 75 kW induction motor runs at 740 rpm in clockwise direction. A 19 tooth helical pinion with20 degree normal pressure angle, 10 mm normal module and a helix angle of 23 degree is keyed to the motor shaft. Draw a 3-dimensional sketch of the motor shaft and the pinion. Show the forces acting on the pinion and the bearing at A and B. The thrust should be taken out at A All dimensions are in mm y 750 B 200 Z2=38 Z₁ = 19 X

11

100 mm B. 30 150 mm 75 mm WAR 6 rad/s 25 mm 100mm in the given system, as the result of AB crank arm's spinning, F gear is starting to have an oscillating motion. B arm has a 6rad/sec angular velocity. find F gear's angular velocity g=9,81

A single-strand roller chain drive connects a 50-hp engine to a lawn waste chipper/shredder, as shown below. As the engine operates at 1000 rpm, the shredding teeth should rotate at 250 rpm. The driven sprocket has 60 teeth. Determine the chain speed.

The figure shows a rotating geared system. A torque of 3N is applied to an input gear in order to accelerate a flywheel at 0.1 rad/s2. The input gear has 11 teeth, and the output gear has 99 teeth. What is the flywheel's inertia? T=3N O O Input gear 11 teeth. Output gear 99 teeth 270 kgm² 57 kgm2 2.7 kgm2 Don't Know 27 kgm2 Flywheel 0.1 rad/s²

The following drive system is used to raise a load at constant velocity. The motor rotational speed is 1000 rpm, and the rotational speed of the drum is 200 rpm. The efficiency of the gear box is 0.85. The efficiency of the drum is 0.95%. The moment of inertia of the motor (input shaft) is 0.5 kg.m², and the moment of inertia of the drum (output shaft) is 0.75 kg.m². Calculate: (1) The total (equivalent) moment of inertia of the drive system referred to the motor shaft. (2) The developed mechanical power on the motor Drum, 0.5 m diameter shaft. 1000 Kg Motor Gearbox