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| Measurement Uncertainty Evaluation for Calculation Factor of the Road Dynamic Deflection |
| DOU Guang-wu1,MIAO Na1,LIU Lu1,ZHANG Bing2 |
1. Research Institute of Highway Ministry of Transport, Beijing 100088, China
2. National Center of Metrization for Equipment of Road and Bridge, Beijing 101103, China |
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Abstract The deflection calculation factor is an important technical index of the FWD accuracy. In order to evaluate the measurement uncertainty of the deflection calculation factor, the definition of deflection calculation factor was determined, and the measurement model was established, the standard deflection sensor, FWD measurement repeatability and linear fitting model were determined as the three main uncertainty components, and the foundation deflection and environmental conditions of the calibration environment were recommended. The experiment result showed that the expansion uncertainty of the deflection calculation factor of the FWD with stable performance was generally between 1.0% and 3.0%, and the linear fit slope was the main influence factor for the measurement uncertainty of the deflection calculation factor.
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Received: 05 June 2019
Published: 10 October 2020
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2020, Vol. 41 
