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- A flywheel maximum speed is 240 rpm and decrease to 200 rpm during the punching stroke. Themean diameter of the rim is 100 cm. Weight of the rim is 500 N and the weight of the arms andhub is 10% of the weight of the rim. Compute the energy released by the flywheel.A three cylinder radial engine driven by a common crank has the cylinders spaced at120°. The stroke is 138 mm, length of the connecting rod is 252 mm andthe mass of the reciprocating parts per cylinder is 2.2 kg. Calculate the primary and thesecondary forces at crank shaft speed of 1500 rpm.A tractor is now drafted in to move the blo ck. The weight of the tractor is equally distributed over all four wheels and it pulls on the blo ck via a rope with tension T. The back wheels have a diameter of 1.6m and the front wheelshave a diameter of 80cm. The tractor motor generates a torque of τ on each of its back wheels that have radii Rb and masses mb. The front wheels of the tractor are smaller than the back wheels and have radii Rf and masses mf. Both sets of wheels can b e treated as uniform solid disks with moment ofinertia I = 1/2mR2. The mass of the tractor body, without the wheels, is M. If the wheels don't slip, show that the tractor can accelerate the block with an acceleration of (see image)
- A loaded governor of the Porter type has equal arms and links each 250 mm long. The mass of eachball is 2 kg and the central mass is 12 kg. When the ball radius is 150 mm, the valve is ful open andwhen the radius is 185 mm, the valve is closed. Find the maximum speed and the range of speed. If themaximum speed is to be increased 20% by an addition of mass to the central load, find what additionalmass is required?A V-belt drives a pulley at a speed of 1440 m/min. The coefficient of friction between belt andpulley is 0.3, semi V-groove angle is 22.5o and angle of contact of belt with the pulley is 160o. Ifthe mass of the belt is 0.45 kg/m and if permissible pull in the belt is 800 N. Calculate the power.Consider the centrifugal tension in the belt.A multiple vee-belt drive is required to transmit 4 kW. The smaller pulley has of the systemhas a diameter 150 mm and rotates at 200 rev/min. The grove angle is 40° and thecoefficient of friction between the belt and pulley is 0·3.(a) If the maximum tension in any one belt is limited to 800 N and the angle of lap is135°, determine the number of belts required. (b) Determine also, the initial pre-tension required in the belt.
- A DC brushed motor has a no-load speed of wo and a stall torque of Ts. a. What is its peak power output, assuming it has no bearing friction? What is the corresponding angular velocity wm of the shaft? Please show how to calculate this. b. Now suppose the motor is subject to bearing friction equal to -Bom, where B > 0 is a drag coefficient, reducing the power produced at the output of the motor. What is the maximum power output in this case, and the angular velocity of the shaft?For the cart of figure, compute the force on the wheels caused by deflecting the jet and thecompression of the spring, if its stiffness is 1.6 kN/m.The block type handbrake shown in the figure has a width of 49 mm and an average friction coefficient of 0.32. Calculate the maximum pressure and braking moment on the lug to ensure the expectation of a thrust force of 483 N in the system with the reverse direction of the clock hand.
- A rotating shaft carrier flywheel which overhangs on the bearing as a cantilever. If this flywheel weight is increased to double of its original weight, the whirling speed will increase by _____ / decrease by ____ / will remain constantTask 6 An industrial trolley of mass 350 kg is used to transport equipment and materials to a workstation within the R and D section. Initially the trolley is at the top of a 15 m high hill, which is inclined at 10º to horizontal as shown and travelling at 6 m/s before rolling down into the station. On reaching the bottom of the hill, brakes are applied to the trolley to slow it down to 0.25 m/s in 4.5 m. Determine: The braking force that slowed the trolley down The time it takes the trolley to slow down The deceleration of the trolleyPorter governor has equal links, each long pivoted at the axis of rotation, is of mass 4 kg and the mass of the central load is 15 kg. The governor begins to lift when the ball radius is 150 mm. It has a maximum speed at a radius of 200 mm. Determine the maximum speed, the range of speed, the sleeve lift, the governor effort, the power of the governor and governor sensitivity.