Abstract
Dynamical responses of vibratory compaction are the basis for extracting compaction indexes in intelligent compaction (IC) technology. However, dynamical response characteristics and its variation mechanisms have not been sufficiently investigated. In this study, a vibratory compaction model was built utilizing finite element (FE) method to observe the characteristics, and nonlinear system theory was introduced to explain the variation mechanisms. The results showed that the dynamical responses varied greatly in different stages, and five operation modes can be classified accordingly. These modes originated from the bifurcation phenomena caused by the enhancement of decoupling nonlinearity between drum and soil. In addition, the variation trend of compaction indexes differed in different modes. These results facilitated to understand the connotation of dynamical response characteristics and laid a foundation for further feedback control technology. The further research can focus on exploring the method of adjusting roller working parameters to achieve an optimal operation mode.
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