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Typically, when a digital transducer is employed to generate the feedback signal for an analog controller, a digital-to-analog converter (DAC) would be needed to convert the digital output from the transducer into a continuous (analog) signal. Similarly, when a digital controller is used to drive an analog process, a DAC has to be used to convert the digital output from the controller into the analog drive signal. There are ways, however, to eliminate the need for a DAC in these types of situations.
(a) Show how a shaft encoder and a frequency-to-voltage converter can replace an analog tachometer in an analog speed-control loop.
(b) Show how a digital controller with PWM can be employed to drive a dc motor without the use of a DAC.
determine the power of a pump if 2000 kgmin of water is compressed from 100 kpa to 1 mpa. the water density can be
Calculate the applied bending moment on a 60 mm x 160 mm rectangular beam with a maximum bending stress of 20,000 kPa.
Enter the data into a spreadsheet. and construct a standard-additions plot of the data.
The cold cranking amperes (CCA) of a conventional lead-acid automobile battery is the amount of current the battery can provide at 0°F for 30 seconds and maintain at least 1.2 volts per cell (or 7.2 volts for a standard 12-volt battery). If a batter..
A rigid rod of negligible mass and length 2l is pivoted at the middle point and is constrained to move in the vertical plane by springs and masses, as shown in Fig. 5.42. Find the natural frequencies and mode shapes of the system.
determine the mass flow rate of fuels in grams per second from the gasoline tank to the cars fuel injection systems and
determine the magnitudes of forces FA and FB acting on each chain and the orientation ? of FB so that the magnitude of FB is a minimum.
Prob. 8.110 In the pivoted motor mount shown the weight W of the 175-lb motor is used to maintain tension in the drive belt
At the instant shown, determine the velocity of the piston, the velocity of the point C and the angular velocity of the connecting rod.
Calculate the effect on the revenue received from the express service if theprice of the ordinary bus service is reduced from $75 to $50 whilethe price of the express bus service remains the same.
The reference voltage for a fuel cell at 80°C is Ev= 1.18 V. Assume any losses to be negligible and that the voltage at which it operates is the open circuit voltage; in reality, the voltage would be lower due to the current flow. What is the outp..
steam at 95 bar and 400 c is supplied in turbine. the condenser pressure is 0.035 bar. if the plant operates as a
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