Identification of characteristic frequencies of damaged railway tracks using field hammer test measurements
| Autor: | Rolf Dollevoet, M. Oregui, Zili Li |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Frequency response
Engineering Field (physics) business.industry Mechanical Engineering Process (computing) Aerospace Engineering Repeatability Structural engineering Track (rail transport) Computer Science Applications law.invention Control and Systems Engineering law Signal Processing Range (statistics) Control chart Hammer business Civil and Structural Engineering |
| Zdroj: | Mechanical Systems and Signal Processing. :224-242 |
| ISSN: | 0888-3270 |
| DOI: | 10.1016/j.ymssp.2014.08.024 |
| Popis: | In this paper, the feasibility of the Frequency Response Function (FRF)-based statistical method to identify the characteristic frequencies of railway track defects is studied. The method compares a damaged track state to a healthy state based on non-destructive field hammer test measurements. First, a study is carried out to investigate the repeatability of hammer tests in railway tracks. By changing the excitation and measurement locations it is shown that the variability introduced by the test process is negligible. Second, following the concepts of control charts employed in process monitoring, a method to define an approximate healthy state is introduced by using hammer test measurements at locations without visual damage. Then, the feasibility study includes an investigation into squats (i.e. a major type of rail surface defect) of varying severity. The identified frequency ranges related to squats agree with those found in an extensively validated vehicle-borne detection system. Therefore, the FRF-based statistical method in combination with the non-destructive hammer test measurements has the potential to be employed to identify the characteristic frequencies of damaged conditions in railway tracks in the frequency range of 300–3000 Hz. |
| Databáze: | OpenAIRE |
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