A new non-destructive testing system based on narrow-band frequency excitation for the condition assessment of pole structures using frequency response functions and principle component analysis

Publisher:
Bundesanstalt für Materialforschung und –prüfung (BAM)
Publication Type:
Conference Proceeding
Citation:
Website Proceedings (NDTnet) of International Symposium on Non-Destructive Testing in Civil Engineering, 2015, pp. 666 - 669 (4)
Issue Date:
2015-09-15
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This work proposes a new narrow-band frequency excitation-based non-destructive testing (NDT) system combined with advanced signal processing technique for damage identification of timber and concrete poles. Compared to traditional hammer impact testing with broad-band frequency wave excitation, this new system adopts tactile transducers to generate controllable stress waves with narrowband frequency, avoiding multi-mode wave excitation of traditional methods. In the proposed NDT method, frequency response functions (FRFs) and principle component analysis (PCA) are used to extract signal features in captured single-mode stress waves for condition assessment. To validate the performance of the proposed system and to assess the effectiveness of the advanced signal processing methods, four different timber poles and five concrete poles with various health states and damage types are employed for NDT testing and assessment. The results show that for the tested poles, the proposed method is able to achieve condition assessment accuracies of as high as 89% for timber poles and 93% for concrete poles. Keywords Non-destructive testing, timber and concrete pole, narrow-band frequency excitation, tactile transducer, frequency response functions, principle component analysis, advanced signal processing
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