Robust Baseline-Free Damage Localization by Using Locally Perturbed Dynamic Equilibrium and Data Fusion Technique
Mode shape-based structural damage identification methods have been widely investigated due to their good performances in damage localization. Nevertheless, the evaluation of mode shapes is severely affected by the measurement noise. Moreover, the conventional mode shape-based damage localization me...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-10-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/20/20/5964 |
| _version_ | 1797550228363018240 |
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| author | Shancheng Cao Huajiang Ouyang Chao Xu |
| author_facet | Shancheng Cao Huajiang Ouyang Chao Xu |
| author_sort | Shancheng Cao |
| collection | DOAJ |
| description | Mode shape-based structural damage identification methods have been widely investigated due to their good performances in damage localization. Nevertheless, the evaluation of mode shapes is severely affected by the measurement noise. Moreover, the conventional mode shape-based damage localization methods are normally proposed based on a certain mode and not effective for multi-damage localization. To tackle these problems, a novel damage localization approach is proposed based on locally perturbed dynamic equilibrium and data fusion approach. The main contributions cover three aspects. Firstly, a joint singular value decomposition technique is proposed to simultaneously decompose several power spectral density transmissibility matrices for robust mode shape estimation, which statistically deals better with the measurement noise than the traditional transmissibility-based methods. Secondly, with the identified mode shapes, an improved pseudo-excitation method is proposed to construct a baseline-free damage localization index by quantifying the locally damage perturbed dynamic equilibrium without the knowledge of material/structural properties. Thirdly, to circumvent the conflicting damage information in different modes and integrate it for robust damage localization, a data fusion scheme is developed, which performs better than the Bayesian fusion approach. Both numerical and experimental studies of cantilever beams with two cracks were conducted to validate the feasibility and effectiveness of the proposed damage localization method. It was found that the proposed method outperforms the traditional transmissibility-based methods in terms of localization accuracy and robustness. |
| first_indexed | 2024-03-10T15:26:30Z |
| format | Article |
| id | doaj.art-4f1f724401b34b8da9b121a11467a4e1 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-10T15:26:30Z |
| publishDate | 2020-10-01 |
| publisher | MDPI AG |
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| series | Sensors |
| spelling | doaj.art-4f1f724401b34b8da9b121a11467a4e12023-11-20T18:00:57ZengMDPI AGSensors1424-82202020-10-012020596410.3390/s20205964Robust Baseline-Free Damage Localization by Using Locally Perturbed Dynamic Equilibrium and Data Fusion TechniqueShancheng Cao0Huajiang Ouyang1Chao Xu2School of Astronautics, Northwestern Polytechnical University, Xi’an 710072, ChinaDepartment of Mechanical, Materials and Aerospace Engineering, School of Engineering, The University of Liverpool, Liverpool L69 3GH, UKSchool of Astronautics, Northwestern Polytechnical University, Xi’an 710072, ChinaMode shape-based structural damage identification methods have been widely investigated due to their good performances in damage localization. Nevertheless, the evaluation of mode shapes is severely affected by the measurement noise. Moreover, the conventional mode shape-based damage localization methods are normally proposed based on a certain mode and not effective for multi-damage localization. To tackle these problems, a novel damage localization approach is proposed based on locally perturbed dynamic equilibrium and data fusion approach. The main contributions cover three aspects. Firstly, a joint singular value decomposition technique is proposed to simultaneously decompose several power spectral density transmissibility matrices for robust mode shape estimation, which statistically deals better with the measurement noise than the traditional transmissibility-based methods. Secondly, with the identified mode shapes, an improved pseudo-excitation method is proposed to construct a baseline-free damage localization index by quantifying the locally damage perturbed dynamic equilibrium without the knowledge of material/structural properties. Thirdly, to circumvent the conflicting damage information in different modes and integrate it for robust damage localization, a data fusion scheme is developed, which performs better than the Bayesian fusion approach. Both numerical and experimental studies of cantilever beams with two cracks were conducted to validate the feasibility and effectiveness of the proposed damage localization method. It was found that the proposed method outperforms the traditional transmissibility-based methods in terms of localization accuracy and robustness.https://www.mdpi.com/1424-8220/20/20/5964damage localizationsingular value decompositionpower spectral density transmissibilityoperational modal analysispseudo-excitation method |
| spellingShingle | Shancheng Cao Huajiang Ouyang Chao Xu Robust Baseline-Free Damage Localization by Using Locally Perturbed Dynamic Equilibrium and Data Fusion Technique Sensors damage localization singular value decomposition power spectral density transmissibility operational modal analysis pseudo-excitation method |
| title | Robust Baseline-Free Damage Localization by Using Locally Perturbed Dynamic Equilibrium and Data Fusion Technique |
| title_full | Robust Baseline-Free Damage Localization by Using Locally Perturbed Dynamic Equilibrium and Data Fusion Technique |
| title_fullStr | Robust Baseline-Free Damage Localization by Using Locally Perturbed Dynamic Equilibrium and Data Fusion Technique |
| title_full_unstemmed | Robust Baseline-Free Damage Localization by Using Locally Perturbed Dynamic Equilibrium and Data Fusion Technique |
| title_short | Robust Baseline-Free Damage Localization by Using Locally Perturbed Dynamic Equilibrium and Data Fusion Technique |
| title_sort | robust baseline free damage localization by using locally perturbed dynamic equilibrium and data fusion technique |
| topic | damage localization singular value decomposition power spectral density transmissibility operational modal analysis pseudo-excitation method |
| url | https://www.mdpi.com/1424-8220/20/20/5964 |
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