1. College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
2. Research Institute of Highway, Ministry of Transport, Beijing 100088, China
3. National Institute of Metrology, Beijing 100029, China
Abstract Sensors are key units of bridge health monitoring (BHM) systems for data collection. However, their measuring performance cannot be easily verified in situ for the absence of proper excitation sources and methods. An online calibrating method is presented which aims at using the load combination by traffic vehicles as an excitation source. To verify the impacts of excitation characteristics on the stability of calibrating results, an experiment is designed with input deflection step length ranging from 0 to 10mm and variation period being 5s, 10s, 15s and 20s. The experiment is performed on a simply supported beam bridge model under random excitation simulated by a programmable linear module. Hypothesis testing is conducted with the experimental results, which shows that given the significance level 0.05, the deflection amplitude and period of excitation source have no effect on calibrating results of the sensors.
JING Gen-qiang,DUAN Fa-jie,LI Jian-shuang, et al. Statistical Analysis on the Impacts of Excitation Sources on Tilt Sensors Online Calibration[J]. Acta Metrologica Sinica, 2019, 40(4): 563-568.
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2019, Vol. 40 
