气压缓冲器非线性数学模型辨识

Identification of nonlinear mathematic model of Air pressure buffer

为了求得某涡喷发动机中气压缓冲器的高精度数学模型 ,利用机理建模的方法 ,建立了气压缓冲器非线性数学模型的基本结构 ,用模型辨识方法得到了模型的参数。通过时域仿真与实测结果的比较 ,证明非线性模型的最大误差比线性模型的小 3倍。

A way to establish a high precision model of an air pressure buffer in a turbo jet was introduced.It contains two phases:firstly to derive the nonlinear model structure based on the physical mechanism of the buffer,secondly to identify the parameters of the nonlinear model from test data.Through comparisons of the simulation results and the field test results,it is shown that the maximum error of the nonlinear model is about a third of that of the linear model.