A low-speed impact positioning system and method for composite laminated structure

By combining discrete wavelet transform and short-time Fourier transform signal processing methods, and applying the DenseNet network and CBAM attention mechanism, the accuracy of low-speed impact positioning in composite laminated structures is solved, achieving efficient and low-cost impact positioning effect.

CN119377581BActive Publication Date: 2025-03-18CHINA JILIANG UNIV
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Patent Information

Application Number
CN202411962125.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-30
Publication Date
2025-03-18
Estimated Expiration
2044-12-30

AI Technical Summary

Technical Problem

The existing impact positioning methods are difficult to achieve accurate low-speed impact positioning in composite laminated structures. They are interfered by factors such as the dispersion characteristics of the impact signal, external noise and boundary reflection, and are expensive or rely on a large number of sensors.

Method used

Combining the signal processing methods of discrete wavelet transform and short-time Fourier transform, the high-frequency components of the impact response signal are extracted, and the impact load is positioned through the DenseNet network and the CBAM attention mechanism, solving the problem that the signal is disturbed by noise when the sensing node is sparse.

Benefits of technology

The precise identification of the impact position of the composite laminated structure under low-speed impact conditions is achieved, which improves the accuracy and efficiency of impact positioning and reduces application costs.

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Abstract

The present invention discloses a low-speed impact positioning system and method for a composite laminate structure, and relates to the technical field of impact positioning. The system includes: a signal acquisition module for acquiring an impact response signal on a composite laminate structure specimen; a signal processing module for performing discrete wavelet transform and short-time Fourier transform on the collected impact response signal; an image enhancement module for performing image enhancement processing on a short-time Fourier time spectrum diagram; a model construction module for constructing an impact positioning model for a composite laminate structure; and an impact positioning module for performing impact positioning on image data through the composite laminate structure impact positioning model, determining the impact position, and performing positioning error calculation and result analysis on the predicted result. According to the technical solution of the present application, accurate identification of the impact position of a composite laminate structure under low-speed impact conditions can be achieved, the impact positioning accuracy and efficiency can be improved, and the application value is high.
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