Modelling and dynamic behavior of a vibratory roller for soil compacting based on lumped-parameter method

Abstract

The interaction between a roller and soil is a complex dynamic

problem that has become an important theoretical requirement

constraining roller design and the application of an advanced

roller in the development of intelligence and informatization in

the roller industry. To clarify the interaction mechanism between a

drum and soil during the rolling process, a two-degree-of-freedom

(DOF) lumped-parameter model for a vibratory roller-soil coupling

system was established with consideration of the contact state

of the soil and the drum. Based on the dynamic equation of the

system, the effects of the soil and the excitation force on the dy

namic behavior of the roller were revealed by introducing certain

parameters. The results show that the natural frequencies of the

system increase obviously from the beginning to the intermedi

ate rolling stage, but the natural frequencies have only slight in

creases after the intermediate rolling stage, while the drum stays

in contact with the soil. Compared with the beginning stage and

the intermediate stage, it can be found that the first and second

natural frequencies increase by 0.29 times and 0.43 times, respec

tively. With the increase of the soil compactness, the possibility of

the vibration state of the roller changing from stability to chaos

increases. Increasing the frequency of the excitation force and

decreasing the amplitude of the excitation force can effectively

improve the vibration of the system, and the dynamic behavior of

the system is more sensitive to the frequency. The modeling and

dynamic analysis of a vibratory roller are presented in this study.

The model can be used for the theoretical analysis of the vibration

recognition of the roller, and the conclusions provide a reference

for the design and application of a roller.