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Piezoelectric stepper motors are actuators that convert vibrations in a piezoelectric element (e.g., PZT) generated by an ac voltage (reverse piezoelectric effect) into rotary motion. Step angles on the order of 0.001° can be obtained by this method. In one design, as the piezoelectric PZT rings vibrate due to an applied ac voltage, radial bending vibrations are produced in a conical aluminum disk. These vibrations impart twisting (torsional) vibrations onto a beam element. The twisting motion is subsequently converted into a rotary motion of a frictional disk, which is frictionally coupled with the top surface of the beam. Essentially, because of the twisting motion, the two top edges of the beam push the frictional disk tangentially in a stepwise manner. This forms the output member of the piezoelectric stepper motor. List several advantages and disadvantages of this motor. Describe an application in which a miniature stepper motor of this type could be used.
a three-blade wind turbine has a rotor diameter of 100 meters and a hub height of 80 meters. if wind power at this site
a cylinderical specimen made of annealed 4135 steel with k equal to 150000 lbin2 and n equal to 0.27 has a diameter of
Write a report on Heat Treatment and Hardenability of Steels.
A 10 kg mass undergoes a process. In this process it transfers 2 kJ of work to its surroundings; it increases in elevation by 50 m, and increases its velocity from 15 m/s to 30 m/s. Its specific internal energy decreases by 5 kJ/kg. For this process ..
water is the working fluid in an ideal rankine cycle. the condenser pressure is 6 kpa and saturated vapor enters the
A rectangular cavity consists of two parallel, 0.5-m- square plates separated by a distance of 50 mm, with the lateral boundaries insulated. The heated plate is maintained at 325 K and the cooled plate at 275 K. Esti- mate the heat flux between th..
determine the force P required to start moving the beam.
A “Pumpkin Chucker” design for the annual Punpkin Chunkin competition held near Millsboro, Delaware every fall (first week of November) uses a pneumatic launcher (air cannon) to throw its pumpkin. It is important to know if your “ammunition”, the pum..
If the beam has square cross section of 9 in., on each side, determine the absolute maximum bending stress in the beam.
two steel i-beams each with a mass of 100 kg are welded together at right angles and lifted by vertical cables so that
Water enter a cooling tower at 400C and drops 150C of temperature before exit. The tower receives atmospheric air at 200C and 40% relative humidity. The air leaves the tower at 350C and 95% relative humidity. If the atmospheric pressure is 1.01325..
Determine the tube length required for the water vapor to reach 99% of saturation. What is the rate at which energy must be supplied to each tube to maintain its temperature at 298 K?
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