Method for controlling inclined plate adjusting angle by adopting nonlinear control law

Abstract

The invention belongs to the field of aircraft air inlet channel inclined plate adjusting systems, and particularly relates to a method for controlling the adjusting angle of an inclined plate througha nonlinear control law. The method comprises the steps that S1, the control law of an air inlet channel inclined plate adjusting system is obtained, in the control law of the air inlet channel inclined plate adjusting system, the air inlet channel inclined plate adjusting system outputs a preset constant value small angle when pi k is larger than or equal to 10.2, and pi k is the static supercharging ratio of an engine air compressor; and S2, controlling the adjustment starting angle of the inclined plate according to the control law of the air inlet inclined plate adjustment system. According to the method for controlling the starting angle of the inclined plate through the nonlinear control law, the control precision and the response speed of the air inlet channel inclined plate adjusting system can be improved, and the problem that the starting angle of the inclined plate is too small in the outfield using process of the air inlet channel inclined plate adjusting system is solved.

Description

technical field [0001] The application belongs to the field of adjustment systems for inclined plates of aircraft inlets, and in particular relates to a method for controlling the angle of adjustment of inclined plates by using a nonlinear control law. Background technique [0002] Aircraft intake swash plate adjustment system is an important functional system related to flight safety and aircraft performance. Its main function is to automatically and continuously adjust the angle of the intake swash plate and change the intake flow to ensure the air intake and the engine. Working together is in the best matching state, so as to obtain the maximum effective thrust of the engine and work stably, preventing the surge of the intake port. The control methods of the intake port mainly include three modes: auxiliary intake valve adjustment, central cone adjustment and inclined plate adjustment, and the systems that realize the above three control modes include three modes: aerodyn...

AI Technical Summary

Problems solved by technology

During the long-term use of the aircraft in the field, the engine has undergone several overhauls and parameter adjustments, and its π k Compared with the design theoretical value, the value characteristics may have a large deviation, but because the main technical index of the engine overhaul is required to be the engine thrust, and its π k The value characteristics are not strictly assessed, so during the flight of the aircraft, engine π k The value is larger than the design value, causing the angle of adjustment of the inclined plate to be too small, so that the pilot cannot confirm whether the system is adjusted normally

[0004] In the prior art, the following methods are usually used to solve the above problems, by changing the control law of the inclined plate adjustment system, but after the modification, a large number of aerodynamic tests and flight test verifications are required; by adjusting the engine, reducing its π k value, the tilting angle can be increased, but the engine thrust will be lost

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