Reliability analysis of Aeroengine Blades Based on Fourier Transform

Abstract

As a key part of aero-engine, blade is responsible for energy conversion. This paper summarizes the significance of traditional aero-engine blade reliability analysis. The basic principle of Fourier Transform is introduced. According to the Fourier transform, the decomposition method of the actual dynamic load curve of the blade in the working process in the frequency domain is deduced, and the dynamic load is decomposed in the frequency domain. The specific information of the sinusoidal harmonics which constitute the time domain signal is obtained, and then the theoretical method of restoring it to the time domain is deduced. The Fast Fourier Transform (FFT) is applied to the time domain signal by MATLAB. The dynamic load of aero-engine blade is analyzed by Fourier Transform, and the derivation process of Fourier Transform and inverse transform is completed. Fourier Transform can simulate the actual dynamic load curve of aero-engine blade, which can be used as the theoretical basis for the next step of aero-engine blade reliability test-bed loading.