Experimental Validation of Non-Marker Simple Image Displacement Measurements for Railway Bridges
| Autor: | Hiroya Kusaka, Fumiaki Uehan, Kodai Matsuoka, Hikaru Tomonaga |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Technology
Brightness Accuracy and precision QH301-705.5 Computer science QC1-999 Acoustics bridge displacement 020101 civil engineering Video camera 02 engineering and technology Displacement (vector) 0201 civil engineering law.invention 0203 mechanical engineering Position (vector) law General Materials Science Biology (General) QD1-999 Instrumentation Fluid Flow and Transfer Processes image measurement Pixel field test Physics Process Chemistry and Technology General Engineering Illuminance Engineering (General). Civil engineering (General) Computer Science Applications Chemistry Range (mathematics) 020303 mechanical engineering & transports railway bridge TA1-2040 non-marker |
| Zdroj: | Applied Sciences, Vol 11, Iss 7032, p 7032 (2021) Applied Sciences Volume 11 Issue 15 |
| ISSN: | 2076-3417 |
| DOI: | 10.3390/app11157032 |
| Popis: | Simple bridge displacement measurement using a video camera is effective in realizing the efficient management of numerous railway structures via condition-based maintenance. Although non-marker image measurement is significantly influenced by the measuring environment, its practical applicability considering the displacement measurement accuracy of non-marker images and the influence of various environments is not completely understood. In this study, the accuracy of non-marker image displacement measurement and the influence of illuminance are confirmed using a model bridge, and the accuracy and applicable range are discussed. Moreover, field tests on two bridges—a steel and a concrete bridge—on low-speed and high-speed railways confirm the accuracy and practical application of non-marker image measurement in a real environment. The displacement was observed to be measured with an accuracy of ~1/30 pixel (error of ~0.4 mm at 20 m position) in the daytime with sufficient brightness. Moreover, the settings for subset positions and post-processing methods to ensure accuracy in non-marker image measurement on concrete bridges with low surface contrast are discussed. |
| Databáze: | OpenAIRE |
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