| Abstrakt: |
Soil compaction by vibratory rollers is simulated mathematically to improve the efficiency of compaction, to increase the reliability and durability of rollers' design, and to improve the vibration safety. Because of nonlinearity and insufficient knowledge of properties of compacted soils, complexity of oscillatory processes in the system "vibratory roller-soil", and a wide range of possible technological conditions of work, the developed mathematical models have to be verified for different models of vibratory rollers and types of compacted soils. This can be verified by the amplitude values of accelerations and movement of a vibratory drum and its frame obtained in the experimental studies. However, the measurement results contain high-frequency harmonics that distort the results. The paper presents the methodology and results of using digital signal filtration technology for processing experimental oscillograms of vibratory roller frame accelerations during soil compaction. The acceleration amplitudes of the roller frame in the exciter modes such as switch-on, steady vibration, and switch-off are obtained within the variable range of the dynamic strain modulus Evd=14...25 MPa. It allows verifying mathematical models not only in the steady, but also in transient modes of vibration including passing of resonance frequency zone of drum dampers. [ABSTRACT FROM AUTHOR] |
