Research On Integrated Control Technology For Variable Geometry Turbo-shaft Engine

This thesis mainly describes two parts of research: integrated control of turboshaft engine andintegrated control of helicopter with engine. New theories and technogogies are proposed for newgeneration turboshaft engine control through investigation of fundamental principle and onboardoptimization method of integrated control design and exploration of basic mechanics and methods ofintegrated control of helicopter and turobshaft engine.Component level steady mathematic models of aero turbo shaft engine are established with variableinlet guide vanes of compressor. And then combined with rotor dynamics and volume dynamics, realtime transient engine model is built so as to be able to run on a certain engine simulator.With the models, the static states, acceleration and deceleration processes of turbo shaft engine aresimulated. Then a method of gray correlation is proposed to estimate the deviation of engine healthparameters. And then, some integrated optimiazation control algorithm is proposed for turbo-shaftengine with components deterioration via nonlinear multiple variables control. Finally, on boardoptimization is tested and investigated after building rapid prototypes of engine, rotor, tracking filterand rotor.Simulation results show that turbo shaft engine component level model is agreed with areo enginetheory, and the dynamic code can calculate the engine states in real time. The proposed integratedcontrol of turbo shaft engine is reasonable and effective. The output shaft power is increasedobviously with max power mode and the power turbine inlet temperature is reduced clearly with mintemperature mode and the engine life is extended. The results also illustrated that turboshaft engine onboard optimization is completed realtime in every control time step and after several times ofoptimization the engine reaches optimal state.A six-freedom unsteady helicopter open loop model is corrected and improved based on theprevious reported simulation platform.,in coordinate system transformation,main rotor modeling,the determination for centre of helicopter's gravity position and etc. The cowork of helicopter andengine is simulated and the integrated control laws of helicopter with engine are presented andsimulated based on the integrated model. A short conclusion of the whole paper and the analysis ofnecessary steps to put the integrated laws into practice are discussed.the simulation results showclearly that the helicopter and turbo-shaft engine integrated model is fit for control system design.Demonstrations tell that the designed integrated control laws are significantly improved thecharacteristics of helicopter dynamic response and robustness.