发动机简化数学模型及数字仿真研究

SIMPLIFIED MATHEMATICAL MODE L AND DIGITAL SIMULATION OF AEROENGINE

本文论述了发动机实时大偏差数学模型两种建模方法 ,即综合数据法、气动热力计算法。完成了数学模型的数字仿真计算及模型比较。模型的计算周期小于 2 0 ms,满足实时性要求 ,误差在允许范围内。并讨论仿真计算结果 ,特别是计算步长和供油规律对发动机调节的影响。

Two real time、large deviation mathematical models of an aeroengine are investigated to develop an airborne simulator,Full Authority Digital Electronic Control (FADEC) system.This study includes three parts:(a)to derive two mathematical models based on aerothermodynamics;(b)to estimate the engine performance by the method of digital simulation;(c)to dis cuss theoretical range of the calculated interval of the dynamic cycle and the model influenced by the fuel control regulation law.Two models are non linear、non iteration and full range.Simulation results show that the accuracy of models is quite good,and most relative errors are less than 3 percent,the biggest is about 5 percent.The calculated interval was reduced to 16ms(on the PC/AT with an Intel 80287 floating point coprocessor and C langu age programming).