MODELIZACIÓN Y COMPORTAMIENTO DINÁMICO DE UN RODILLO VIBRATORIO PARA LA COMPACTACIÓN DEL SUELO BASADO EN EL MÉTODO DE PARÁMETROS CONCENTRADOS

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 dynamic 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 intermediate rolling stage, but the natural frequencies have only slight increases 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, respectively. 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. Keywords: Vibratory roller, Lumped-parameter model, Dynamic behavior