Research On Control Method Of Continues Descent Approaching Based On Model-Based Design

Global civil aviation is developing at a very high speed,bringing the contradiction between the matters of tight airspace caused by the increase of number of fights and the expectation of the development of future civil aviation being safe,efficient,environmental and thrifty.New flight technologies that continuously appear were regarded as one of the most effective methods to solve the contradiction.However,any new flight technology need to be comprehensively evaluated the influence on the flight safety.How to implement the evaluation of flight safety reasonably on the condition of lacking of real data becomes one of the important issues bothering perplexing the civil aviation.Simulation verification which has the characters such as inexpensive,low risk,fast and effective compared with traditional verification with small sample real fights.The main problem facing is how to establish reasonable and reliable flight simulation environment.Continues descent approaching(CDA)is one of the new flight technologies which accords with the trend of future civil aviation and was popularized world widely.CDA has obvious advantages over traditional step approaching way on environment protection,energy saving,noise decreasing,etc.This technology was required to use the potential energy furthest and reduce the output of engines to realize the approaching and landing.Thus,this flight stage faces higher requirements in the ability of the coordinating of control and management.The evaluation of civil aviation safety needs a continuously and intensively flight that is large-scale,long-time and multi-flights,it’s hard to realize such a high-duty verification by manual work alone.Realizing the autonomous flight of CDA is the primary problem to be solved when we implement the large-scale simulation verification.For this purpose,this article used model-based-design(MBD)and developed auto flight semi-physical simulation platform that satisfy the requirement of CDA,providing the basement of large-scale simulation and verification.The whole process of MBD that from model building to code generation supports the iteration optimizing of designing testing and verifying.It has more reasonable,more reliable and more effective process,cutting down the period of development and increasing the efficiency.Thus,the semi-physical simulation system this article developed has good expansibility,can support the desire for verification of future new flight technologies.The main works of this paper are as follows:1.Established a model-based-design semi-physical simulation platform that satisfied the research and verification of CDA flight control.Including the conception designing of terminal traffic state simulation platform at macroscopic lay as well as flight control subsystem at microcosmic lay.2.Realized the designing and communication of flight control subsystem unit combined with the flight simulator.Designed CDA flight program based on Lu Kou international airport.Built CDA flight environment.3.Designed the control strategies and algorithm satisfied CDA flight character using B737-400 as control object from the perspective of engineering application,recurring the analyzing and decision on flight statement and control operation of pilots.4.Implemented CDA flight simulation following the model-based-design process based on the works above,including model software simulation,code optimization,code generation,and hardware simulation.Realized the simulation of CDA flight technology and the verification of system platform.