The invention belongs to the technical field of aircraft manufacturing, and particularly relates to an aircraft longitudinal short-period time domain fitting method which comprises the following steps: S1, establishing an aircraft longitudinal low-order equivalent system transfer function model, and integrating a dynamic time domain parameter identification model; s2, performing fixed division by taking the equivalent time delay tau theta as a known quantity so as to construct a new input vector; s3, obtaining an identification result of each unknown parameter and a corresponding objective function value; and S4, obtaining a fitting result of the longitudinal low-order equivalent system of the airplane. According to the technical scheme, the time domain fitting method is adopted, the dynamic time domain model of the low-order equivalent system is established, the situation that measurement deviation exists in actual test flight data is considered, then the parameter identification model is integrated, compared with frequency domain fitting and time domain fitting, a high-order model of the system does not need to be known, input and output discrete data can be directly used for obtaining the fitting result, and the fitting efficiency is improved. The implementation process is simple.
本发明属于飞机制造技术领域,尤其涉及是一种飞机纵向短周期时域拟配方法,包括以下步骤:S1,建立飞机纵向低阶等效系统传递函数模型,并整合出动态时域参数辨识模型;S2,将等效时间延迟τθ作为已知量进行固定划分,以构建新的输入向量;S3,获得各未知参数的辨识结果及对应的目标函数值;S4,获取飞机纵向低阶等效系统的拟配结果。本技术方案采用时域拟配方法,建立低阶等效系统的动态时域模型,并考虑实际试飞数据中存在测量偏差的情况,再整合出参数辨识模型,相比于频域拟配,时域拟配无需知道系统的高阶模型,可直接利用输入输出的离散数据获取拟配结果,实施过程简单。
Aircraft longitudinal short-period time domain fitting method
一种飞机纵向短周期时域拟配方法
05.07.2024
Patent
Elektronische Ressource
Chinesisch
IPC: | B64F GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT , Boden- oder Flugzeugträgerdeckeinrichtungen besonders ausgebildet für die Verwendung in Verbindung mit Luftfahrzeugen / G06F ELECTRIC DIGITAL DATA PROCESSING , Elektrische digitale Datenverarbeitung |