环控系统功能试验温度控制建模与仿真

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。

Modeling and Simulation for Temperature Control System of Environmental Control System Functional Test

In order to ensure the units of environmental control system working well before the first flight of the aircraft,ground heat air source is simulated the engine source for conducting environmental control function test of high temperature,high pressure and high flow rate gas in the stage of final assembly and test.However,the temperature control system has large inertia and lag,and aircraft inlet temperature control precision obtained in the traditional way of using manual modulation is often difficult to meet the test requirements.Hence then the model of temperature control system of ground testing equipment is built and simulated under the MATLAB environment by using PID automatic control,which contains the effects caused by the dynamic characteristics of pneumatic diaphragm control valve.The simulation results show that the test temperature obtained by PID controller can meet the technical requirements.