航空发动机大偏差状态变量模型建立方法

提出一种基于各参数物理意义的状态变量模型建立方法,研究了模型参数在包线内的变化情况.建模过程中,首先建立航空发动机的小偏差状态变量模型,再采用线性插值的方法构造航空发动机的大偏差状态变量模型.采用本方法建立的小偏差数学模型完全能保证模型的稳态精度,并取得了较高的动态建模精度,其计算工作量比原拟合法更小、运算速度更快.同时模型各参数物理意义明确,在包线内的变化较有规律,在构造大偏差模型时获得了较高的模型精度.

Aero-engine Large-Deviation State Variable Modeling

A state variable modeling method is introduced based on the physical parameters, and the change regularity of model parameters in the envelope is researched. Firstly, the small-deviation state variable models (SVMs) are established, and then the large-deviation SVM is obtained by the linear insert approach. The small-deviation mathematical model built by the method can guarantee the static precision of the model, thus it obtains a high dynamic precision. The calculation workload is less and the operation speed is faster than that of the old curve fitting method. Meanwhile, model parameters have clearly physical meaning and change relative regularity in the envelope. The large-deviation state variable model built by the method has a good precise.