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Adaptive control of the gas-turbine aircraft engine’s compressor inlet guide vanes based on sliding modes

DOI 10.18127/j20700814-201809-03

Keywords:

T.A. Kuznetsova - Ph.D.(Eng.), Associate Professor, Department of Design and Technologies in Electrical Engineering, Director of Distance Education Technologies Centre, Perm National Research Polytechnic University
E-mail: tatianaakuznetsova@gmail.com


The actual task of the new generation gas turbine engines’ automatic control systems (ACS GTE) design is the development of algorithms, providing the adaptability to external and internal disturbances.
The adaptation to variable external and internal disturbances is currently carried out by introducing a complex branched logic to that ACS realizing the proportional-integral and proportional-integral-differential control laws. This algorithmic redundancy require significant computing resources. If we consider engine control at the node level, this complication reduces the speed and reliability of the automatic control system, and also greatly complicates the practical implementation.
For meeting of heightened requirements for AСS GTE quality, the use of binary control algorithms was proposed. Control in such systems having a variable structure is carried out along two contours: the coordinate feedback in the main loop containing the control object and the coordinate-parametric feedback in the additional circuit, which allows to change the structure and parameters of the controller. Unlike adaptive systems using the principle of disturbance control to compensate for parametric disturbances, the proposed system uses the principle of deviation (error-closing) control regulation for the same purposes.
As the control object, the gas-turbine aviation engine’s compressor inlet guide vanes (IGV) are considered, as the most crit-ical node for ensuring the compressor stability, in particular for absence of stalling and surging effects.
The main feature of the developed system is the appearance of a sliding mode inside some conical region of the phase space around the hyperplane, which is a function of the control error and its derivatives. The presence of a sliding mode allows to achieve a given speed and stability in a wide range of characteristics of the control object.
The control algorithm and the structure of the binary automatic control system of hydraulic drive of IGV GTE are synthe-sized. Approbation of the developed system with calculated parameters is made. The simulation of a controlled transient in a real hydraulic drive of IGV showed that the system has insufficient speed.
The analysis of the results of a series of model experiments made it possible to draw the conclusions about the character of influence of the parameters of a binary automatic control system on the quality of regulation.
The main feature of IGV is the nonlinearity caused by the constructive characteristics and the effect of internal and external disturbances.
To obtain the parameters of ACS IGV satisfying the given requirements, their optimization was carried out using the nu-merical Monte Carlo method. The method is based on using the Sobol-sequences which are the sequences of pseudo-random numbers. As a result of optimization, the values of the parameters of the binary automatic control system of the hydraulic drive of IGV GTE were obtained, which allow to achieve the high speed and quality of regulation (1.5−2 times higher than for industrial regulators).
To study the adaptive properties of the developed ACS IGV, a series of tests was done in the disturbances conditions. Based on the processing of the array of experimental data, the change in the slope of the speed characteristic of the hydraulic drive, which determines the dependence of the rate of change of the output signal of the hydraulic drive on the input control current, is chosen as a generalized identifier of the disturbances action.
The analysis of the adaptive properties of the developed ACS IGV GTE for the case of deviation of the slope of the velocity characteristic by ± 10%, ± 20%, ± 50% showed that the overshoot as compared with the industrial regulator is reduced by about 2−3 times, and there is no oscillation.
The developed ACS IGV GTE allows providing the best speed and quality of regulation, a greater degree of adaptation to the change of the nonlinear control object’s characteristics in comparison with industrial regulators.

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