Terrestrial Analog System Design Of High-altitude Environment

The power system is one of the most important equipments of modern aircraft, whose stable running is the key factor for the safe flying of plane. It is necessary to take High-altitude working circumstance simulation test before the power system parts are mounted on plane. This paper introduces the buildup of High-altitude simulation system. The design of press subsystem, temperature subsystem and air subsystem which constitute the whole system is presented. The control algorithm of each subsystem and the design of software are also discussed.The first part illustrates the test system configuration, introduces the kinds of measurement and control methods used for pressure, temperature and flux, and designs the signal processing box which serves as a bridge during information exchange between computer and peripheral equipments. In the second part, analyses the three subsystems respectively and proposes the theory of Takagi-Sugeno (T-S) fuzzy model which has been widely used in model identification. On the basis of above works, design three control algorithms for each subsystem. The combination of T-S model identification and Dynamic Matrix Control (DMC) algorithm is designed for press control because of its high demand. The temperature system, however, according to its lower demand compare to press system, is controlled by the algorithm of combination of T-S model identification and PID method. In terms of air flux system, design a fuzzy controller imitating the field operators' experiences which have been proved efficiently. In the last part, presents the design of software and solving methods of several key problems which have been met during software design. The feasibility of design is proved by actually running.