The invention discloses a dynamic derivative data processing method based on discrete Fourier transform, and belongs to the technical field of aviation aerodynamic wind tunnel special test data processing. The problem that in the prior art, a traditional dynamic derivative data processing method is low in result precision due to the non-frequency multiplication phenomenon is solved. The method comprises the following steps: acquiring a pitching moment signal and an angle element signal of an aircraft model in a vibration process through a balance; according to a set sampling rate and a set sample number, calculating to obtain a resolution frequency; obtaining a discrete Fourier transform formula under the main vibration frequency according to the correlation function calculation formula and the resolution frequency; according to the first phase difference and the second phase difference, calculating to obtain a phase difference between the collected pitching moment signal and the angle element signal; according to a dynamic derivative calculation formula in the pitching direction and the phase difference, a final dynamic derivative value is obtained through calculation. The method effectively improves the accuracy of the aircraft model dynamic derivative processing result, and can be applied to processing the aircraft model dynamic derivative test data.
本发明公开了一种基于离散傅里叶变换的动导数数据处理方法,属于航空气动力风洞特种试验数据处理技术领域。解决了现有技术中传统的动导数数据处理方法因非倍频现象导致的结果精度较低的问题;本发明通过天平采集飞行器模型在振动过程中的俯仰力矩信号和角度元信号;根据设定的采样率和样本数,计算得到分辨频率;于相关函数计算公式和分辨频率,得到主振动频率下的离散傅里叶变换公式;根据第一相位差和第二相位差,计算得到采集的俯仰力矩信号和角度元信号之间的相位差;根据俯仰方向的动导数计算公式和相位差,计算得到最终动导数值。本发明有效提升了飞行器模型动导数处理结果的准确性,可以应用于对飞行器模型动导数试验数据进行处理。
Dynamic derivative data processing method based on discrete Fourier transform
一种基于离散傅里叶变换的动导数数据处理方法
22.04.2025
Patent
Elektronische Ressource
Chinesisch
IPC: | G01M TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES , Prüfen der statischen oder dynamischen Massenverteilung rotierender Teile von Maschinen oder Konstruktionen / 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 |
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