The Study Of A320 Flight Control Logic

In this thesis, Airbus A320 aircraft flight control logic is the research object. Conversion logic of the A320 flight control logic is finished out, according to partial contents of the flight control system in AMM and FCOM for A320. The flight control logic is classified as horizontal channel (containing three control modes), vertical channel (containing eight control modes) and common channel (containing five control modes)Firstly, builds the sub-mode models. Based on the modes division, a complete flight process is divided into five stages:taking off, climbing, cruising, down and approach.Basis of modes carving, mark off the complete flight, it will be divided into takeoff, climb, cruise, down, and approach five stages. For each control mode of a flight phase that may be called, this thesis makes deeply study on the conditions of connection and disconnection for each mode, concludes the each mode's control condition and the state transition among different modes, summarizes each control mode with flowchart and builds the sub-mode models.Secondly, establish the sub-phases model. The control mode which may be called in each flight stage is abstracted as a series of states, including initial state, intermediate state and terminative state. The logical control condition is inputed as a kind of state. By the modes' state transition and the relationship among different control conditons, sub-phases model is built on the basis of the finite state machine.The last, A320 flight control logic model was established. Symbolic different stages of flight into a series of status states, the control logic conditions in flight as input, basis of the relationship between flight and the control logic conditions, receive the transfor relationship between state and input, using the state transition diagram shows the relationship between the five stages and establish A320 flight control logic model. Sum up, this paper has made a system architecture diagram, described how to call the flight control logic in the whole system.