Saturday, January 8, 2022

Used for intelligent fault-tolerant semi-physical simulation experiment of engine control system


Construction and debugging of semi-physical closed-loop control system. This paper first established a component-level real-time model of a certain type of turboshaft engine, and then used this real-time model to form a closed-loop system on a mechanical hydraulic fuel regulation system. This experiment was carried out on the turboshaft engine semi-physical simulation experiment platform of 608 Institute. The experimental device is shown in Figure 2. The engine digital simulator is equipped with a real-time component-level model of a turboshaft engine. According to the position of the load rod (given by the potentiometer outside the experimental device) and the fuel flow rate Gfu, the gas generator speed N and power turbine speed are calculated from the model. N. The static pressure P and N at the outlet of the compressor are sent to the control cabinet through the AD channel output speed signal to drive the motor 1 and the motor 2 respectively; and the output pressure P electrical signal is converted into a pressure signal through electrical conversion, and the pressure signal after passing through the voltage divider The pressure is P′ and is sent to the fuel control system. The automatic fuel controller controls the N speed to maintain a constant speed by reflecting the fuel-air ratio G’. Since the numerical control system of the turboshaft engine is still under development, this experiment uses a hydraulic-mechanical fuel control system instead.

This article first conducted an open-loop acceleration and deceleration test. After a preliminary assessment of the system’s work, the closed loop can be cut into the closed loop only by making the fuel flow at the starting point approximately the same. During the closed-loop experiment, the strong fuel oscillation was caused when the load rod was pushed, so that the system could not work normally. After analyzing the experimental results, the following methods were adopted: (1) Increase the resistance of the fuel regulator: semi-physical simulation research on the intelligent fault tolerance technology of the engine numerical control system, reduce the magnification; (2) increase the interrupt timing program, and Simplify the real-time graphical interface, all curves and digital quantities are displayed in the simplest way, and the interface is convenient and friendly. *The problem of fuel oscillation has been solved afterwards. It should be noted that the same oscillation phenomenon occurred during the bench test of this system together with the engine, which was also solved by increasing the damping and reducing the magnification. The results of the semi-physical simulation experiment of the engine control system show that the results of the semi-physical simulation experiment are consistent with the bench test phenomenon of the turboshaft engine. The system can be used in the intelligent fault-tolerant semi-physical simulation experiment of the engine control system.

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