Q23 In an automated control system, a device is responsible for converting control signals into physical action to regulate a process. What are the two essential roles this device must fulfil to ensure accurate and effective operation?
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This device is described as converting control signals into physical action to regulate a process. This type of device is commonly known as an actuator. Show more…
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Adi S.
Review the processes sketched in Figure 1.7a through d in which the con trolled variable is to be maintained at its desired value. (a) From your chemical engineering background, suggest the physical principle used by the sensor. (b) Explain the causal relationship between the manipulated and controlled variables. (c) Explain whether the control valve should be opened or closed to in crease the value of the controlled variable. (d) Identify possible disturbances that could influence the controlled vari able. Also, describe how the process equipment would have to be sized to account for the disturbances.
Sri K.
1.1 Draw a component block diagram for each of the following feedback control systems: a. The manual steering system of an automobile b. Drebbel's incubator c. The water level controlled by a float and valve d. Watt's steam engine with fly-ball governor In each case, indicate the location of the elements listed below and give the units associated with each signal: - The process - The desired output signal - The sensor - The actuator - The actuator output signal - The controller - The controller output signal - The reference signal - The error signal Notice that in a number of cases, the same physical device may perform more than one of these functions. 1.2 Identify the physical principles and describe the operation of the thermostat in your home or office. 1.6 Feedback control requires being able to sense the variable being controlled. Because electrical signals can be transmitted, amplified, and processed easily, often we want to have a sensor whose output is a voltage or current proportional to the variable being measured. Describe a sensor that would give an electrical output proportional to the following: a. Temperature b. Pressure c. Liquid level d. Flow of liquid along a pipe (or blood along an artery) e. Linear position f. Rotational position g. Linear velocity h. Rotational speed
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