Wavelet Analysis Of Vehicle-pavement Interaction

With the development of the economy, it sparks the need of moving goods and personnel throughout the country. The new traffic condition represents the feature of heavier traffic density, bigger gross rail load on axle, and the faster speed. Under these circumstances, vehicle-pavement interaction is very important to pavement engineers. First of all, with the extensive network of paved surfaces in service today, the cost of maintaining or replacing roadways can become staggering. Additionally, deteriorated roadway surface directly affect the life cycle of the vehicles that travel them. Finally deteriorated roadway surfaces greatly impact safely.One factor contributing to roadway deterioration is pavement roughness. The process of vehicle and pavement interacts, pavement roughness can cause the vibration, the vibration cause the dynamic load of the pavement contrarily. The vehicle dynamic load caused by road roughness is the main reason of fatigue and premature failure of the pavement. In order to research pavement roughness, the author applies the theory of wavelet to this thesis. Vehicle-pavement interaction in the frequency domain has traditionally been studied using Fourier analysis. The limitation of using Fourier analysis is the fact that the resulting transformed signal lacks any reference to time. Consequently isolated roughness "events" might be overlooked when analyzing a long pavement profile. The paper is consisted of six chapters as follows:In the chapter 1: the research work for dynamic response of the pavement in the world is reviewed. The necessity of carrying the analysis Vehicle-pavement interaction for the pavement is point out.In the chapter 2: introducing the methods of measurement and the index of evaluation of these indices. According to the more than 200 measurement results of pavement surface roughness from Beijing , Tianjin, Dalian, Hei longjiang province, five of them were chosen for the analysis. Therefore, the foundations for the analysis of vehicle and pavement system are set up.In the chapter 3: introducing the application of the wavelet. The wavelet theory is currently used in signal processing but is gaining popularity in the field of pavements.In the chapter 4: the subject investigated is the 1/2 vehicle model with four freedom of motion; the importation is the actual measurement digital information. With all the information we can calculate the dynamic load and dynamic load coefficient. The dynamic load can be analyzed using wavelet decomposition. The results from the seven-level wavelet decomposition can be present which level has the biggest dynamic load, and the frequency of this level. With the same method, the power spectral density of the pavement can also be made.In the chapter 5: supercharge load is one of the most universal things in the world. In this thesis, the problem of supercharge load can be made in detail. The regularity, which the supercharge load rate and the change of the speed impact the pavement can also be made.In the chapter 6: some main conclusions are given and future research work is also discussed.