Oscillation mode flight data analysis based on FFT

Abstract

Purpose

The purpose of this paper is to propose an identification method of acquiring aircraft mode characteristics based on fast Fourier transform and half-power bandwidth method, aiming at the common oscillation met in flight test.

Design/methodology/approach

The feasibility of this method is demonstrated through derivation; the robustness analysis is conducted through three examples, and finally the method was applied on a set of sideslip angle record from flight test.

Findings

The derivation and numerical analysis both show that the presented method can have high accuracy and good robustness under coupled mode and noise condition.

Practical implications

The method proposed is of robustness, and it is concise and easy to apply on flight data record.

Originality/value

This paper demonstrates the feasibility of half power bandwidth to be applied on oscillation mode characteristics identification from flight data record, which is different from other method applied.

Citation

Fu, J., Huang, J., Wang, L.-B. and Song, L. (2020), "Oscillation mode flight data analysis based on FFT", Aircraft Engineering and Aerospace Technology, Vol. 91 No. 1, pp. 157-162. https://doi.org/10.1108/AEAT-04-2018-0139