Coupling Mechanism And Decoupling Study Of Vehicle

Modern aircraft faces with increasingly complex flying conditions, the coupling ofaircraft can not be ignored. The presence of coupling presents a greater challenge to thedesign of the aircraft control system. The paper uses the multivariable frequency domaintheory to accomplish the decoupling of the aircraft. This paper mainly includes thefollowing contents:First, according to the characteristics of axisymmetric vehicles, a sixDegree-Of-Freedom motion model is presented based on the reentry movementcharacteristic. Then the model is simplified by using the small deviation theory. Commoncoordinate system and the coordinate transformation are also proposed in this chapter.Next, the paper describes the coupling problem of the aircraft. According to thegenerating mechanism of the coupling, aerodynamic coupling, inertia coupling andkinematic coupling are researched.On the basis of the analysis of the coupling mechanism, the paper compensatesaerodynamic coupling, inertia coupling and kinematic coupling. The compensationresults are followed. Based on the coupling compensation, the paper uses BP neuralnetwork to fit the aerodynamic parameters. Simulation results show the effectiveness ofthe method.On the basis of the coupling compensation, the paper uses Simulink to set up thecoupling compensation platform. With Simulink mod ular design ideas and graphicaloperator interface, the platform has a good performance in simulation.Finally, this dissertation gives its conclusions and the discussion about the futurework on decoupling of aircrafts.