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冲压发动机动态模型是研究控制系统的基础,动态模型的准确性直接影响控制方案的有效性。为了获得面向控制的高精度低阶动态模型,利用试验数据,理论分析传递函数模型,选择误差平方和最小作为辨识准则,并利用非线性最小二乘法对模型进行辨识,获得了燃油控制系统中燃油流量对燃油指令的传递函数模型。进而将该模型和发动机气路通道模型结合起来,建立了发动机推力对燃油流量的传递函数模型。辨识模型的时域特性曲线与试验数据符合得很好,能够代表发动机系统的主要动态特性。
The dynamic model of ramjet engine is the basis for the research of control system. The accuracy of the dynamic model directly affects the effectiveness of the control scheme. In order to obtain the control-oriented high-precision low-order dynamic model, using the experimental data, the transfer function model was theoretically analyzed, the minimum sum of squares of the errors was selected as the identification criterion, and the model was identified by using the nonlinear least square method. The fuel in the fuel control system Transfer Function Model of Flow to Fuel Directive. Then the model is combined with the engine air passage model to establish the transfer function model of the engine thrust to the fuel flow. The time-domain characteristic of the identification model is in good agreement with the experimental data and represents the main dynamic characteristics of the engine system.