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为了确保飞机首飞前环控系统各功能部件正常工作,飞机总装测试阶段需使用地面热气源模拟发动机气源,进行高温高压大流量压缩空气的环控功能试验,其中温度控制系统属于大惯性系统并有滞后性,传统上采用手动调节的方式,然而飞机入口温度控制精度往往难以达到试验要求。针对该问题,论证建立了包括气动薄膜调节阀阀芯构件动态特性等因素在内的地面试验设备温度控制系统数学模型,采用PID自动控制,并在MATLAB环境下进行了仿真。结果表明,PID控制器作用下的试验温度满足试验技术要求。
In order to ensure the normal operation of each function part of the environmental control system before the first flight of the aircraft, the ground-based hot gas source is used to simulate the engine gas source during the final assembly test, and the loop control function test of the high-temperature and high-pressure high-flow compressed air is performed. The temperature control system belongs to a large inertial system And lag, the traditional manual adjustment method, however, the temperature control accuracy of the aircraft entrance is often difficult to meet the test requirements. In view of this problem, the mathematical model of temperature control system of ground test equipment, including the dynamic characteristics of valve train core components of pneumatic diaphragm control valve, is established. The PID control is adopted and the simulation is carried out in MATLAB environment. The result shows that the test temperature under the action of PID controller meets the requirements of test technology.