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The article is devoted to simulation of a subsystem for providing a resonant mode of operation of an automated installation for conducting fatigue vibration tests. The article discusses the block diagram of the system and algorithms of initial search for the resonant frequency and adjusting the resonant frequency. This article uses an autonomous control system to find and maintain resonance. In this system, the computer is not included in the main loop of the control system. In such a system, the search for the resonant frequency is carried out at the minimum of the control signal coming from the controller output to the attenuator control input. The input data for the program are the initial value of the frequency of the master oscillator, the step frequency change $\Delta\omega$, the time of transient processes, the value of the output voltage of the regulator at resonance, the amplitude of oscillation of the blade, which is determined by the voltage applied to the reference element. At each step of the program execution, a new frequency value is entered into the setting generator. After the transition process is established, the value of the output signal from the controller is measured. If it differs from the threshold value by less than 5%, the search for the resonant frequency ends. Otherwise, the master oscillator frequency changes by $\Delta\omega$ in the decreasing direction. |
