Simulation Study On Application Of Chaotic Vibration In Compaction

Chaos theory has been developed since 70's this century. Chaotic vibration, the combination of chaos theory and mechanical vibration theory, is a newer research field. Great achievement has been gained in theoretical study of chaotic vibration in China and abroad over the past two decades. But, there are fewer results on the application of chaotic vibration in engineering, especially in the big size engineering machinery. The purpose of the dissertation is to study high performance vibratory roller by using chaotic vibration exciter with broad and spectrum instead of traditional harmonic exciter. Firstly, Some of the basic concepts of chaotic vibration are introduced, the qualitative and quantitative methods of chaotic vibration identification are detailed, the selection of associated parameters is studied, the algorithms for calculating the maximum Lyapunov exponent, correlation dimension and periodicity ratio are provided. On the basis of analysis and comparison of different methods, the methods used in the paper are selected. Secondly, the mathematical models for VE type three eccentric chaotic exciter and forrame rum oil system of chaotic vibratory roller are built. The numerical simulation and chaos identification are finished under different parameters of the exciter. The relationships between the chaotic characteristics of the exciter as well as the rame rum oil system and the parameters of the exciter are investigated. Then, the experiment is conducted to verify that the vibration of the drum of 14 tons chaotic vibratory roller is chaotic. In terms of chaos identification, the results of the measurement are consistent with the trends predicted by the simulation. Finally, the results from comparing the compaction parameters between haotic and raditional vibratory roller show that the performance of haotic is better than that of raditional...