基于系统辨识的冲压发动机动态模型分析  

Dynamic Characteristic Model Analysis of Ramjet Engine Based on the System Identification Method

作　　者：梁俊龙[1] 张贵田[1] 胡宝文[2] 

机构地区：[1]西北工业大学固体火箭发动机燃烧热结构与内流场国防科技重点实验室,西安710072 [2]西北工业大学航天学院,西安710072

出　　处：《弹箭与制导学报》2017年第3期147-151,共5页Journal of Projectiles,Rockets,Missiles and Guidance

摘　　要：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 is fundamental for control system of ramjet. Furthermore, the accuracy of dynamic model directly impacts the viability of control scheme. In order to get control-oriented high accuracy dynamic model with low order, according to the test results, the transfer function model of the theoretical analysis, select the minimum error sum of squares as the system identification criteri- on, and to identify the model by using nonlinear least squares method, the transfer function model of fuel flow in fuel control system is generated. By combining this model with the engine air path model, the transfer function model of the engine thrust to the fuel flow is estab- lished. The time domain characteristic curve of the identification model is in good agreement with the test results, which can represent the main dynamic characteristics of the engine system.

关 键 词：冲压发动机 动态模型 燃油控制系统 传递函数 参数辨识 

分 类 号：V235.213[航空宇航科学与技术—航空宇航推进理论与工程]