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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。
In order to obtain the high precision mathematical model of the air cushion in a turbojet engine, the basic structure of the nonlinear mathematical model of the air cushion was established by using the method of mechanism modeling. The model parameters were obtained by the model identification method. By comparing the time-domain simulation with the measured results, it is proved that the maximum error of the nonlinear model is 3 times smaller than that of the linear model.