Vehicle vibration is a factor limiting the increase of forward speed. Vibration has a well known influence on riding comfort, but its effect on the undulations of soil surface and on the irregularities of soil compaction is of great importance as well. The purpose of our work was to study the influence of the rolling tyre on soil compaction with different speeds. Field tests were performed with an all-wheel drive tractor to investigate the characteristics of vehicle vertical vibration and the characteristics of the wheel rut and the soil compaction under the tyre on sandy loam soil. The test results show that the increase of speed up to about 1,5 m/s decreases the soil compacting effect of the tyre. The irregularities of soil compaction and the undulations of the wheel rut bottom surface increases with the speed above 2,0 m/s. It is concluded that the vehicle vibration, the undulations of the rut bottom surface and the irregularities of soil compaction have the same predominant frequency. It is also concluded that the variation of vehicle vibration causes the irregulaties of rut depth and soil compaction along the wheel rut.
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