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What are the advantages and disadvantages of pneumatic actuators in comparison with electric motors in process control applications? A pneumatic rack-and-pinion actuator is an on/off device that is used as a rotary valve actuator. A piston or diaphragm in the actuator is moved by allowing compressed air into the valve chamber. This rectilinear motion is converted into rotary motion through a rack-and-pinion device in the actuator. Single-acting types with springs return and double-acting types are commercially available. Using a sketch, explain the operation of a piston-type single-acting rack-and-pinion actuator with a spring-restrained piston. Could the force rating, sensitivity, and robustness of the device be improved by using two pistons and racks coupled with the same pinion? Explain.
20 kg of r134 a at 300 kpa fills a rigid container whose volume is 28 l. determine the temperature and the total
in an actual refrigeration cycle using r-12 as the working fluid the refrigerant flow rate is 0.05 kgs. vapor enters
find the stresses developed in the machine. Use two beam elements for the column and one beam element for the arm. Assume the material of the machine as steel.
for a piece of aluminum stock choose a grinding wheel that will grind .050 of stock from it. show the grinding wheel
a 1 hp electric motor drives a water pump. the pump volumetric flow rate is 2103 m3s at 300 k.a determine the head loss
a long power transmission cable is buried at a depth ground to cable centerline distance of 2 meters. the cable is
The USEIA reported that in 2011, the average American household consumed 11,280 kWh for the year. On the outskirts of a small city, an energy company has constructed a single, large wind turbine (blade diameter 30 m). A typical average wind speed ove..
determine the maximum stresses for hole diameters
Find the deflection and slope at point a of the simply-supported beam shown in Fig. 4.39 using the second Castigliano theorem. Assume linear elastic behavior.
Assuming a coefficient of static friction equal to 0.2 at the common surface, find the maximum torque that may be transmitted by the flywheel without slippage.
ore from gold mines is about 0.02 gold by mass. seawater contains gold too at about 1 part per trillion by volume. gold
Calculate the maximum tensile and compressive stresses σt and σc, respectively, at the base of the tree due to its weight.
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