路面動水壓力光纖傳感測量與模擬分析研究.pdf

1、南京航空航天大學(xué)碩士學(xué)位論文路面動水壓力光纖傳感測量與模擬分析研究姓名：陳昊申請學(xué)位級別：碩士專業(yè)：道路與鐵道工程指導(dǎo)教師：高俊啟20090301路面動水壓力光纖傳感測量與模擬分析研究 II Abstract When a vehicle is running on the road that covered by water film, the dynamic hydraulic pressure (DHP) will not onl

2、y make the vehicle hydroplaning, but also increases permeability of asphalt pavement, which brings moisture damage on the asphalt pavement much easier. Accordingly, the studies for measuring the dynamic hydraulic pressur

3、e become very important. Fiber grating is one of the most important inventions at the end of twentieth century. The fiber grating is a new Photoelectronic device and along with the ripening technology of fabricating fibe

4、r gratings, the researches and application of fiber grating sensors have obtained more and more attentions. In order to measure the DHP in asphalt pavement, based on the working principle of fiber Bragg grating (FBG) se

5、nsing, a FBG pressure sensor is presented. The main research results are the following: Firstly, based on the Bragg’s Law in FBG, the strain and temperature sensing properties have been analyzed. The characteristic of th

6、e displacement-pressure of a flat diaphragm is studied, and on the basis of this, a FBG pressure sensor is presented. The pressure sensitive principles of FBG pressure sensor are introduced, and the relationship between

7、the pressure and the wavelength shift is derived. Secondly, the pressure of FBG sensor is linear with wavelength shift of FBG through the indoor experiment. And the pressure measurement sensitivities are as high as 6.025

8、5nm/MPa, which are approximately 2008 times greater than that of a bare FBG (0.003nm/MPa). The FBG sensor is used to test the dynamic hydraulic pressure in the road pavement of Ninghang expressway. The experimental resul

9、ts show that the sensor has good stability and better anti-interference ability, and it is suitable for application in the measurement of DHP. Finally, according to fluid-structure Interaction algorithms of the FEA softw

10、are (ANSYS/LS-DYNA), the problem of DHP is simulated and analyzed, experimental results are compared with value of calculation, and put forward some questions that should be paid attention to on the measurement of DHP in