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The results of the research carried out based on both dynamic modelling and „in situ” experiments, evidenced that for certain types of soils (sandy, brown clay, mixtures of clay with mineral aggregates and stabilizers with binders), the stiffness changes during compaction after each pass over the same road layer. The Research Institute for Construction Equipment and Technologies ICECON, Bucharest (Romania), implemented Research Programs funded by the Ministry of Research that highlighted the role and importance of dynamic analysis on the self-propelled vibratory roller of the compaction equipment with rear traction tires. In this context, several aspects of the vehicle-terrain interaction were monitored, highlighting the real-time changes of soil stiffness while maintaining constant damping, with each successive pass over the same road layer. This article points out relevant aspects of the dynamic analysis for a three-degree-of-freedom model with concentrated mass in soil contact and a length-distributed mass that models the equipment’s chassis. The links between masses are linear viscoelastic with stiffness kj and viscous damping cj, where j = 1,2,3. Based on the dynamic response resulting from experiments with variation of amplitudes depending on the excitation pulse, there were plotted the variation curves parameterized according to the soil’s discrete variable stiffness k1 changing after each pass of the vibratory roller over the same road layer. The efficiency of the compaction process of the vibratory roller is estimated based on the force transmitted to the soil in dynamic mode. For adequate representation of the variation mode depending on the excitation pulse, there were plotted the variation parameterized curves by the soil discrete variable stiffness. In a very special way, the determining role of automation is highlighted, which leads to the suppression of some resonance states. Thus, the system evolves only through one or two resonance states instead of the three resonance states or eigenmodes in the elastic regime.

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Identification of Resonances Based on Modal Analysis for Systems with Multiple Degrees of Freedom when Changing the Stiffness of the Processed Material

  • 会议论文

  • 发表日期：

    2026年

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  • Polidor Bratu,
  • Ovidiu Vasile,
  • Cristina Marinela Nitu,
  • Ligia Munteanu,
  • Mihaiela Iliescu

摘要

The results of the research carried out based on both dynamic modelling and „in situ” experiments, evidenced that for certain types of soils (sandy, brown clay, mixtures of clay with mineral aggregates and stabilizers with binders), the stiffness changes during compaction after each pass over the same road layer. The Research Institute for Construction Equipment and Technologies ICECON, Bucharest (Romania), implemented Research Programs funded by the Ministry of Research that highlighted the role and importance of dynamic analysis on the self-propelled vibratory roller of the compaction equipment with rear traction tires. In this context, several aspects of the vehicle-terrain interaction were monitored, highlighting the real-time changes of soil stiffness while maintaining constant damping, with each successive pass over the same road layer. This article points out relevant aspects of the dynamic analysis for a three-degree-of-freedom model with concentrated mass in soil contact and a length-distributed mass that models the equipment’s chassis. The links between masses are linear viscoelastic with stiffness kj and viscous damping cj, where j = 1,2,3. Based on the dynamic response resulting from experiments with variation of amplitudes depending on the excitation pulse, there were plotted the variation curves parameterized according to the soil’s discrete variable stiffness k1 changing after each pass of the vibratory roller over the same road layer. The efficiency of the compaction process of the vibratory roller is estimated based on the force transmitted to the soil in dynamic mode. For adequate representation of the variation mode depending on the excitation pulse, there were plotted the variation parameterized curves by the soil discrete variable stiffness. In a very special way, the determining role of automation is highlighted, which leads to the suppression of some resonance states. Thus, the system evolves only through one or two resonance states instead of the three resonance states or eigenmodes in the elastic regime.