Track след; направляющее приспособление
Servomechanism, Regulator and Process Control
жүктеу/скачать 464,87 Kb.
|
Бухина пособие автоматизация и управление (1) (1)
| Servomechanism, Regulator and Process Control
by S. K. Bhattacharya Servomechanism is an automatic control system in which the controlled variable value is forced to follow the variations of reference value, instead of regulating a variable value to “set point”. Take, for example, an industrial robot arm. It is also called tracking control system. Regulator is a feedback control system in which controlled variable is maintained at a constant value in spite of external load on the plant. The reference input or command signal although adjustable, is held constant for long period of time. The primary task is then to maintain the output and the desired value in the presence of disturbances. Examples are regulation of steam supply in steam engine by fly-balls governor, thermostat control of home-heating systems, regulation of the voltage of an alternator, frequency controller and speed controller and so on. Process control refers to control of such parameters as level, flow, pressure, temperature and acidity of process variables. A particular parameter has only one desired value. The control system is required to ensure that the process output is maintained at the desired level in spite of external disturbances which affect the process. Bhattacharya, S. K. Control Systems Engineering. – Pearson Education India, 2009. – 550 p. (P. 6). Translate the word combinations with Participles: a) Participle I Active and Passive The receiving station; the following problem; the leading branch of industry; a growing interest; the age of “thinking machines”; the increasing pressure; interacting variables The engineers discussing the design; the equipment being installed in…; scientists contributing to the development of this theory; magnetic field forming electromagnetic waves; inventors improving the device; the experiment being carried out; the engineer operating with high frequency modulator; the systems improving productivity When discussing the design…; when using the controllers…; demonstrating the possibility of…; speaking about the law… Being founded (=when founded) in 2010…; being examined (=while examined)…; being heated (=when heated)…; being supplied (=though supplied) with the necessary equipment…; the experiment being carried out… жүктеу/скачать 464,87 Kb. Достарыңызбен бөлісу:
|