关键词: 垂直激振, 弹塑性变形, 不对称滞回模型, 跳振, 混沌

Abstract:

The resilience against displacement revealed asymmetrical hysteresis during the vibratory compaction. As the soil compactness was high enough, the jump vibration of vibration roller was produced. An asymmetric hysteresis model was established in terms of segmental line according to soil property parameters. According to the first order approximation, the equivalent damping coefficient and equivalent stiffness coefficient were deduced through the harmonic linearization method. By means of numerical simulation, the hysteresis response characteristics of the drum were analyzed. During the beginning of vibration compaction, soil presents elastic-plastic characteristics and super-harmonics occur. With the increase of soil density during the ending of vibratory compaction, sub-harmonics may occur, which marks the occurrence of jump vibration.Under some conditions, chaos can be induced. Adjustment of excitation amplitude and excitation frequency can availably restrain jump vibration and chaos motion of the drum.

Key words: vertical excitation, elastic-plastic deformation, asymmetric hysteresis model, jump vibration, chaos