高阶控制增稳系统等效拟配参数时域在线辨识方法

现代控制增稳飞机是高达几十阶的复杂系统,将其降阶为特定形式的低阶等效系统才能与已有飞行品质规范进行比较,进而预测和评价飞机飞行品质.从时域角度出发,提出了一种高阶控制增稳系统等效拟配参数在线辨识方法.分析了时域等效系统拟配的基本方法,提出了等效系统实时在线拟配的系统框架思路,基于Tustin变换法推导了由高阶系统时域响应获取四阶等效系统参数的数学公式,应用最小二乘法在MATLAB中实现了算法编程,并用试飞数据验证了所提方法的可行性.计算结果表明,所提方法可以快速准确地实现高阶控制增稳系统的等效系统参数辨识.

Online Time-domain Identification Method of High Order Control Augmentation Equivalent System Parameters

The order of modern highly control augmented aircraft is very high.It should be reduced to its low order equivalent system(LOES) for forecasting and evaluating the handling quality of aircraft.An online time-domain identification method of high order control augmentation equivalent system parameters is proposed.Basic method of online time-domain match method is analyzed.The system framework of online time-domain match method of this paper is established.Mathematical formulas of obtaining the equivalent system parameters from time-domain response of high order control augmentation system are deduced based on Tustin transformation method.Arithmetic programming is established based on least squares method in MATLAB.An example is proposed to validate the method's feasibility.Calculation results show that the proposed method can fast and accurately realize the equivalent system parameters' identification.