Flutter signal analysis method based on convolutional neural network and short-time Fourier transform

A convolutional neural network and short-time Fourier technology, applied in neural learning methods, biological neural network models, neural architectures, etc., can solve problems such as processing methods that have not yet been formed, and achieve good reliability and accuracy
CN110866448APending Publication Date: 2020-03-06NORTHWESTERN POLYTECHNICAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NORTHWESTERN POLYTECHNICAL UNIV
Publication Date
2020-03-06

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Abstract

The invention relates to a flutter signal analysis method based on a convolutional neural network and short-time Fourier transform. The flutter signal analysis method comprises the following steps: performing time-frequency analysis on an actually measured flutter signal by using short-time Fourier transform to obtain a time-frequency graph of the flutter signal, mining image features by using thepowerful image processing capability of a convolutional neural network, and realizing flutter feature extraction and subsequent signal analysis through calculation of a full connection layer and a loss function. According to the flutter signal analysis method, the convolutional neural network is combined with the short-time Fourier transform of the flutter signals, so that the flutter signal analysis method has good reliability and accuracy for analysis of actually measured flutter data, lays a certain foundation for further development of research on combination of artificial intelligence and air elasticity, and has practical engineering application value.
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Description

technical field

[0001] The invention belongs to a flutter signal analysis method, and relates to a flutter signal analysis method based on a convolutional neural network and a short-time Fourier transform. Background technique

[0002] Flutter is a very dangerous aeroelastic instability phenomenon produced by an elastic structure under the coupled action of aerodynamic force, elastic force and inertial force, which often leads to disastrous consequences. However, due to the deficiencies in the theoretical analysis and calculation of flutter at the present stage, in order to supplement and verify the flutter design, the flutter test in engineering has become an unavoidable important link in the aircraft development process, and the flutter signal can be analyzed and processed accurately and effectively. It is an important task of this kind of experimental data processing.

[0003] In the flutter test, the structural response signal most directly reflects the process of mode ...

Claims

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