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Journals / Mühendislik Bilimleri Dergisi / 2008 / Cilt: 14 - Sayı: 1

Structural damage detection in an open cross section beam using continuous wavelet transform

Açık kesitli bir kirişte sürekli bir dalgacık dönüşümüyle yapısal hasar teşhisi

HAKAN GÖKDAĞ
Osman KOPMAZ
Pages
1–9
DOI
—
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

Therefore, in this study, it is also explained where the correct measurement locations must be to obtain the wavelet coefficients more sensitive to damage.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:This paper is concerned with the determination of the damage location and extent of an open cross section beam by continuous wavelet transform on its first mode shape.
📊
Key Findings & Data:To extract the mode shape, the finite element method is used, and the damage is modeled by a local decrease in the Young modulus of a beam element.
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Conclusion & Impact:Therefore, in this study, it is also explained where the correct measurement locations must be to obtain the wavelet coefficients more sensitive to damage.
🔬Design:Modeling & Simulation
📍Scope:Comprehensive Sample
⚙️Variables:Domain Parameters

Abstract

This paper is concerned with the determination of the damage location and extent of an open cross section beam by continuous wavelet transform on its first mode shape. To extract the mode shape, the finite element method is used, and the damage is modeled by a local decrease in the Young modulus of a beam element. The classic modal analysis techniques based on changes in frequency or mode shape curvature are demonstrated to be insufficient for the damage conditions considered. The technique of wavelet analysis is shown to be more effective than the curvature change method especially in the case of noisy data. Since the beam cross section is not symmetric, the mode shape to be measured is essentially dependent on the location of displacement transducer on the beam width, resulting that the sensitivity of wavelet coefficients to damage will be different. Therefore, in this study, it is also explained where the correct measurement locations must be to obtain the wavelet coefficients more sensitive to damage.

Özet

Bu çalışmada açık kesitli bir kirişin temel mod şekli sürekli dalgacık dönüşümü ile analiz edilerek hasar yeri ve derecesi belirlenmiştir. Hasar elastisite modülündeki azalma olarak modellenmiş, hasarlı kirişin mod şeklini belirlemek için sonlu elemanlar metodu kullanılmıştır. Seçilen hasar durumlarında frekans veya eğrilik değişimlerine dayalı klasik modal analiz metotlarının yetersizliği vurgulanmıştır. Özellikle gürültülü veriyi işlemede dalgacık analizinin eğrilikten daha başarılı olduğu gösterilmiştir. Böyle bir kirişte kesit simetrik olmadığından ölçülecek mod şekli ölçme elemanının kiriş eni doğrultusundaki konumuna büyük ölçüde bağlıdır. Dolayısıyla elde edilecek dalgacık katsayılarının hasara duyarlılığı da farklı olur. Bu çalışmada hasara daha duyarlı katsayıları elde etmek için doğru ölçüm noktaları örnek bir kiriş üzerinde gösterilmiştir.

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Cite This Article

GÖKDAĞ, H., KOPMAZ, O. (2008). Structural damage detection in an open cross section beam using continuous wavelet transform. Mühendislik Bilimleri Dergisi, Cilt: 14 - Sayı: 1, 1–9. https://ajindex.com/articles/289113

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