Investigation of paver screed on coupling compaction characteristics considering shock and vibration
JIA Jie1，LIU Honghai1，XIN Qiang2，WAN Yipin1
1.Key Laboratory of Road Construction Technology and Equipment, Ministry of Education, Chang’an University, Xi’an 710064, China；
2.Inner Mongolia Traffic Design and Research Institute Co., Ltd., Hohhot 010010, China
To improve the initial density of a paving mixture behind the paver, the research of the dynamic compaction system of materials and compaction equipment including tamper and vibrator is needed.In the system, the reaction force generated by the vibrating tamper will impact screed.A periodic rectangular wave for the impact was presented and a dynamic model of the compaction system under the action of shock and vibration excitation was established.The effects of different vibration frequency and vibration frequency on the dynamic mechanical properties of the screed were analyzed.At the same time, the coupling effect of vibration and the vibration were calculated.Then, based on the combination of the vibration theory and the mathematical model, frequency characteristic of the paving density was discussed.Test and simulation results show that, the maximum response peak of screed is at the resonance frequency, but the response peak above the resonant frequency section is reduced by 23% comparing with the maximum, obtaining higher paving density and smooth operation of screed.Further more, compaction effect of tamper is greater than the vibrator.There are three main frequency components acting on screed with the action of tamper and vibrator, these excitations can be adapted to the complex components with different natural frequencies, which may provide the possibility of multi resonance during paving compaction.Therefore, when studying the vibration performance of screed to paving mixture, not only to consider the main resonance of the vibration frequency close to the natural frequency of material, but also should pay attention to the impact of tamper and the coupling effect of them to compacting paving.Results of the experiment can provide the basis for the selection of vibration parameters of the paver screed.
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