Theoretical study of the system stabilization of the amplifier properties of the radio channel for units with rotating parts
Journal Title: Вісник Житомирського державного технологічного університету. Серія: Технічні науки - Year 2018, Vol 81, Issue 1
Abstract
Automation of ore grinding control is restrain due to the lack of sufficiently accurate systems for transferring information from rotating parts of aggregates to stationary ones. The aim of the work is a theoretical study of the system stabilization of the radio channel reinforcement properties. The work solves the problems of theoretical investigation of the stabilization of the radio channel reinforcement properties, the rationale for the radio transmitter, the radio receiving system and the automatic regulator of the amplification mode. Methods of analysis, studies of radio transmitting and radio receiving devices, discrete control systems, theory of automatic control, digital systems were used. As a result of theoretical studies it was established that the frequency stability of the radio channel is high, and the amplitude stability is low. In this radio channel, the amplitude stability takes the first problem place, which has not been solved in radio engineering yet. It is proved that the amplitude stability can be increased to the required values by setting the preset value of the radio channel gain. The gain is set by applying the reference signal and automatically adjusting in the low-frequency amplifier of the receiver by a digital controller with a relatively low error of ± 1 %. The functional nodes of the radio channel are controlled by a cyclic system. For the first time, a radio channel was created for transmitting signals from rotating parts of aggregates to fixed ones, in which high amplitude stability is achieved. An experimental verification established almost complete coincidence of the parameters of the random process at the input and output of the radio channel. The dispersion of the signals at the modulator input and the output of the radio channel, respectively, amounted to 1.8585 and 1.8489 units, the number of positive emissions for the zero level is 4, and spectral densities occupy the range from 50 to 250 Hz.
Authors and Affiliations
А. N. Matsui, V. А. Кondratets
Keywords
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