Визначення частотних характеристик системи автоматичного регулювання шафи холодильника
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Файли
Дата
2018
Автори
Майдан, П.С.
Золотенко, Е.О.
Коротич, О.О.
Пундик, С.І.
Maidan, P.S.
Zolotenko, E.O.
Korotych, O.O.
Pundyk, S.I.
Назва журналу
Номер ISSN
Назва тому
Видавець
Хмельницький національний університиет
Анотація
В роботі представлено результати визначення частотних характеристик системи автоматичного
регулювання (САР) шафи холодильника в розімкнутому чи замкнутому станах. Дослідження елементів та систем
автоматичного регулювання виконуються на основі спеціальних частотних характеристик. Для визначення
необхідної інформації про поведінку ланки в реальних умовах треба виконати експеримент, коли на вхід ланки
подається синусоїдальний сигнал, на виході ланки з’явиться в якості вихідної величини також синусоїдальний,
який буде відрізнятися від вхідного синусоїдального сигналу амплітудою та кутом зсуву фаз. Відношення
вихідного сигналу до вхідного дасть нам значення амплітудно-фазової характеристики (АФХ) елемента чи САР.
Розглянуто розв’язання поставленої задачі з використанням різних програмних середовищ, таких як LabVIEW,
MathCad, MatLab.
The paper presents the results of determination of the frequency characteristics of the automatic control system (ACS) of the refrigerator in open or closed states. Investigation of elements and systems of automatic regulation is performed on the basis of special frequency characteristics. In order to determine the necessary information about the behavior of the link in real conditions, an experiment must be performed when the sinusoidal signal is fed to the input of the link; at the output of the link, the sinusoidal output will also be output, which will be different from the input sinusoidal signal by the amplitude and phase shift angle. The ratio of the output signal to the input will give us the value of the amplitude-phase characteristic (AFS) of the element or ACS. The decision of the problem with using different software environments such as LabVIEW, MathCad, MatLab is considered. Using the LabVIEW software environment requires knowledge of a graphical programming language for constructing flowcharts and using cycles and embedded mathematical functions. The introduction of values in the formulas that describe a closed ACS must be performed in the reverse order. The easiest in calculations is the software product MathCad. To determine the frequency characteristics, only the transmission function of the open ACS and the values of the coefficients that are included in the expression will suffice. MathCad software using built-in functions calculates the amplitude-frequency and phasefrequency characteristics and builds the graphical dependencies we need. The built-in functions of the Matlab software environment can not only calculate the transfer functions of the open-source ACS, build logarithmic frequency-frequency and phase-frequency charts, but also calculate the stability of the phase and amplitude. The determination of frequency characteristics of ACS, in the example of the refrigerator, clearly demonstrated that the use of software products and environments (LabVIEW, MathCad, Matlab) increases the accuracy of the determination of system stability reserves. But it requires knowledge not only of the theory of automatic control, but also of the basics of writing the necessary file-programs to bring the transfer functions in the necessary form.
The paper presents the results of determination of the frequency characteristics of the automatic control system (ACS) of the refrigerator in open or closed states. Investigation of elements and systems of automatic regulation is performed on the basis of special frequency characteristics. In order to determine the necessary information about the behavior of the link in real conditions, an experiment must be performed when the sinusoidal signal is fed to the input of the link; at the output of the link, the sinusoidal output will also be output, which will be different from the input sinusoidal signal by the amplitude and phase shift angle. The ratio of the output signal to the input will give us the value of the amplitude-phase characteristic (AFS) of the element or ACS. The decision of the problem with using different software environments such as LabVIEW, MathCad, MatLab is considered. Using the LabVIEW software environment requires knowledge of a graphical programming language for constructing flowcharts and using cycles and embedded mathematical functions. The introduction of values in the formulas that describe a closed ACS must be performed in the reverse order. The easiest in calculations is the software product MathCad. To determine the frequency characteristics, only the transmission function of the open ACS and the values of the coefficients that are included in the expression will suffice. MathCad software using built-in functions calculates the amplitude-frequency and phasefrequency characteristics and builds the graphical dependencies we need. The built-in functions of the Matlab software environment can not only calculate the transfer functions of the open-source ACS, build logarithmic frequency-frequency and phase-frequency charts, but also calculate the stability of the phase and amplitude. The determination of frequency characteristics of ACS, in the example of the refrigerator, clearly demonstrated that the use of software products and environments (LabVIEW, MathCad, Matlab) increases the accuracy of the determination of system stability reserves. But it requires knowledge not only of the theory of automatic control, but also of the basics of writing the necessary file-programs to bring the transfer functions in the necessary form.
Опис
Ключові слова
логарифмічна амплітудно-частотна характеристика, амплітудно-фазова частотна характеристика, LabVIEW, MathCad, MatLab, logarithmic amplitude-frequency characteristic, amplitude-phase frequency characteristic, LabVIEW, MathCad, MatLab
Бібліографічний опис
Визначення частотних характеристик системи автоматичного регулювання шафи холодильника [Текст] / П. С. Майдан, Е. О. Золотенко, О. О. Коротич, С. І. Пундик // Вісник Хмельницького національного університету. Технічні науки. – 2018. – № 4. – С. 68-77.