the total force (in Newton) exerted by a tooth of the pinion on the tooth on a mating
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- .A steam engine develops power at mean torque of 18,000 N-m and velocity of 9 m/s. The mean diameter of the flywheel rim is 1.3 meters. The coefficient of fluctuation of speed is 0.03 and the coefficient of fluctuation of energy is 0.21. Determine the thickness of the rim in mm if the width of the rim is twice of its thickness. Assume density of rim material as 7250 kg/m3.A spur pinion of pitch diameter 50 mm rotates at 200 rad/s and transmits 3 kW power. The pressure angle of the tooth of the pinion is 20°, what is the total force exerted by a tooth of the pinion on the tooth on a mating gear?Q2: The gear of epicyclic involve a planet wheel which have 28 teeth, sun wheel which has 24 teeth, and an internal toothed annulus which is held stationary. Neglecting friction, if the sun wheel rotates at 700 rev/min, determine the torque required to hold the annulus at rest when 9 kW is being transmitted. What is the diameter of the circle traced out by the centers of the planet wheels, if the teeth have a module of 4.
- Suppose an automobile engine can produce 195 N⋅m of torque, and assume this car is suspended so that the wheels can turn freely. Each wheel acts like a 14 kg disk that has a 0.195 m radius. The tires act like 2.15-kg rings that have inside radii of 0.18 m and outside radii of 0.34 m. The tread of each tire acts like a 8.5-kg hoop of radius 0.335 m. The 16-kg axle acts like a solid cylinder that has a 1.75-cm radius. The 29.5-kg drive shaft acts like a solid cylinder that has a 3.25-cm radius. Calculate the angular acceleration, in radians per squared second, produced by the motor if 95.0% of this torque is applied to the drive shaft, axle, and rear wheels of a car.A 3-strand chain and sprocket turns 650 rpm and has a service factor of 1.5. If 15 HP/strand chain is to be used, find the torque that the chain and sprocket can deliver. (Ans. 242.4 ft-lbs)Q1/ An open belt drive connected two pulleys 120 cm and 50 cm diameter on parallel shafts 4 m apart. The belt weights 0.9 kg/m length and maximum tension in it is not to exceed 2000 N. 0.3. The 120 cm pulley, which is the driver, runs at 200 rpm. Due to belt slip on one of the pulleys, the velocity of the driven shaft is only 450 rpm. Calculate the torque on each of the two shafts and power transmitted.
- Prob # 9. Find the horsepower transmitted by a pair of friction wheels, the diameter of driving wheel is 10 inches, and it revolves at 200 rpm. The width of the wheel is 2 inches. The force per inch width of face is 150 pound and the coefficient of friction is 0.20. a. 96 hp b. 23 hp c. 1.2 hp d. 1.6 hpA wheel of radius r = 43.1 cm and rotational inertia about the axis of 0.09 kg.m? fixed on a frictionless inclined plane that makes angle = 29° with the horizontal. An m = 1.6 kg block is held on the plane by a massless string wrapped around the wheel. A force of magnitude F = 7.2 N is applied to the block in the direction shown in the !! figure below. Calculate the magnitude and direction of the angular acceleration of the wheel? [Recommended time : 5-8 minutes] O a. 8.0 rad/s^2 Direction: Clockwise O b. 16.5 rad/s^2 Direction: Clockwise O C. -0.4 rad/s^2 Direction: Counter-clockwise O d. 0.4 rad/s^2 Direction: Clockwise O e. B.O rad/s^2 Direction: Counter-clockwise O f. 16.5 rad/s 2 Direction: Counter-clockwiseA 220 mm diameter of 14.5 degrees involute gear is used to transmit 50 kW at 580 rpm Find the total force transmitted on the gear.
- A brake test is carried out with a balance and a direct current motor. The purpose of this experiment is to calculate the torque on the motor shaft. The following values were obtained in the experiment. U=220 volts., I=107 amps, n = 1200 rpm. The length from the axis of the motor shaft to the point where the brake lever presses on the scale is L=80 cm. and the weight read on the balance G = 20 Kg. is Accordingly, calculate the following values: a) the shaft power taken from the shaft of the motor, b) the electrical power drawn by the motor from the mains c) motor total losses and motor efficiency Calculate(Q2) The following data are given for the drum brake shown in figure (1) • Drum diameter is 400mm • Width of the shoe is 75mm • The coefficient of friction is 0.24 • The maximum pressure is 1MPA. • The drum rotates 3000rpm in counter clock wise direction. • The equivalent polar moment of inertia is 10 kg.m/s? Determine the minimum actuating force and the frictional torque. What is the time required for deceleration to the rest? FjF 100 150° 126 112 50 50 I Fig.(1)(Q2) The following data are given for the drum brake shown in figure (1) • Drum diameter is 400mm • Width of the shoe is 75mm • The coefficient of friction is 0.24 • The maximum pressure is 1MPA. • The drum rotates 3000rpm in counter clock wise direction. • The equivalent polar moment of inertia is 10 kg.m/s? Determine the minimum actuating force and the frictional torque. What is the time required for deceleration to the rest? 62 62 F 100 150° 126 112 50 50 I Fig.(1)