为了控制摊铺密实度，针对摊铺机熨平板与铺层材料构成的振动压实系统，将铺层材料对振捣机构的作用力展开为傅里叶级数形式，并考虑振捣器惯性力，建立了熨平板在振捣激励和振动激励作用下的振动模型；基于熨平板振动模型，研究了振动频率、压实系统固有频率、阻尼比对熨平板振幅影响，建立了铺层材料密实度与熨平板振幅的关系模型，提出了铺层材料密实度控制方法，并通过试验进行了验证。研究结果表明：基于振捣器与混合料周期接触分离的熨平板振动模型，得到的熨平板加速度频谱包含由振动频率、振捣频率及其二次谐波分量，仿真结果与现场试验一致；当摊铺材料为AC25，振动频率由10Hz增加至35Hz，熨平板振幅增大，铺层材料密实度升高；通过调整熨平板振动频率，可实现铺层材料密实度控制，提升路面施工质量。
Abstract
To control paving density and improve asphalt mat uniformity, vibration compaction system composed of screed and asphalt mat was analyzed. The Fourier series was used to express tamper excitation on the vibrating mechanism. Tamper inertia force was considered and reaction force of tamper on the screed was obtained, screed vibration model with tamper excitation and vibration excitation was established; Based on screed vibration model, the influence of vibration frequency, asphalt mat natural frequency and damping ratio on the screed amplitude was analyzed. Relation between paving density and screed amplitude was established. Control method of paving density was proposed. The screed vibration model and paving density control method were verified by experiments. The results show that: Based on the vibration screed model in which tamper and asphalt mat are periodically contacted and separated, screed acceleration spectrum includes the vibration frequency, the tamper frequency and second harmonic component. The simulation results are consistent with the field test; When paving material is AC25, screed amplitude and asphalt mat density increase with vibration frequency from 10Hz to 35Hz；By adjusting screed vibration frequency, asphalt mat density can be controlled and asphalt mat quality is improved.
关键词
道路工程 /
摊铺机 /
熨平板 /
振动模型 /
振幅 /
密实度
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Key words
Road Engineering /
Paver /
Screed /
Vibration Model /
Amplitude /
Density
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