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    Influence of Rocking Motion on Vibratory Roller-Based Measurement of Soil Stiffness

    Source: Journal of Engineering Mechanics:;2010:;Volume ( 136 ):;issue: 007
    Author:
    Norman W. Facas
    ,
    Paul J. van Susante
    ,
    Michael A. Mooney
    DOI: 10.1061/(ASCE)EM.1943-7889.0000132
    Publisher: American Society of Civil Engineers
    Abstract: Experimental data have shown that vibratory roller compactors often exhibit rotational kinematics in addition to translation during operation. This rotation is not considered in roller-integrated measurement systems that estimate soil stiffness based on drum vibration. To model and explore the effect of rotation, a lumped parameter roller/soil model was developed. The machine parameters for this model were tuned from suspended drum testing that isolated the drum from the ground. The model was then verified using field data collected over a range of excitation frequencies on spatially homogenous soil, and over transversely heterogeneous soil using one excitation frequency. Rotational motion was found to significantly influence roller-integrated measurement of soil stiffness based on single position drum vibration data. Rotational motion causes single position measurement system results to be nonunique and to vary depending on the direction of roller travel. Using the model, various alternative measurement schemes were investigated. The directional dependence was eliminated by deriving a measurement at the drum’s center of gravity, and dual-sided measurement is proposed to gain a measure of heterogeneity. A more theoretical approach was also created wherein the contact force between the drum and soil are measured rather then being calculated.
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      Influence of Rocking Motion on Vibratory Roller-Based Measurement of Soil Stiffness

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    http://yetl.yabesh.ir/yetl1/handle/yetl/60584
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    • Journal of Engineering Mechanics

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    contributor authorNorman W. Facas
    contributor authorPaul J. van Susante
    contributor authorMichael A. Mooney
    date accessioned2017-05-08T21:43:19Z
    date available2017-05-08T21:43:19Z
    date copyrightJuly 2010
    date issued2010
    identifier other%28asce%29em%2E1943-7889%2E0000142.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/60584
    description abstractExperimental data have shown that vibratory roller compactors often exhibit rotational kinematics in addition to translation during operation. This rotation is not considered in roller-integrated measurement systems that estimate soil stiffness based on drum vibration. To model and explore the effect of rotation, a lumped parameter roller/soil model was developed. The machine parameters for this model were tuned from suspended drum testing that isolated the drum from the ground. The model was then verified using field data collected over a range of excitation frequencies on spatially homogenous soil, and over transversely heterogeneous soil using one excitation frequency. Rotational motion was found to significantly influence roller-integrated measurement of soil stiffness based on single position drum vibration data. Rotational motion causes single position measurement system results to be nonunique and to vary depending on the direction of roller travel. Using the model, various alternative measurement schemes were investigated. The directional dependence was eliminated by deriving a measurement at the drum’s center of gravity, and dual-sided measurement is proposed to gain a measure of heterogeneity. A more theoretical approach was also created wherein the contact force between the drum and soil are measured rather then being calculated.
    publisherAmerican Society of Civil Engineers
    titleInfluence of Rocking Motion on Vibratory Roller-Based Measurement of Soil Stiffness
    typeJournal Paper
    journal volume136
    journal issue7
    journal titleJournal of Engineering Mechanics
    identifier doi10.1061/(ASCE)EM.1943-7889.0000132
    treeJournal of Engineering Mechanics:;2010:;Volume ( 136 ):;issue: 007
    contenttypeFulltext
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