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冲击载荷下摊铺机振捣机构对混合料的压实特性

贾洁 杨晓宇 刘洪海 万一品

贾洁, 杨晓宇, 刘洪海, 万一品. 冲击载荷下摊铺机振捣机构对混合料的压实特性[J]. 西南交通大学学报, 2022, 57(6): 1277-1283. doi: 10.3969/j.issn.0258-2724.20210795
引用本文: 贾洁, 杨晓宇, 刘洪海, 万一品. 冲击载荷下摊铺机振捣机构对混合料的压实特性[J]. 西南交通大学学报, 2022, 57(6): 1277-1283. doi: 10.3969/j.issn.0258-2724.20210795
JIA Jie, YANG Xiaoyu, LIU Honghai, WAN Yipin. Compaction Characteristics of Paver Tamper to Mixture Considering Shock Load[J]. Journal of Southwest Jiaotong University, 2022, 57(6): 1277-1283. doi: 10.3969/j.issn.0258-2724.20210795
Citation: JIA Jie, YANG Xiaoyu, LIU Honghai, WAN Yipin. Compaction Characteristics of Paver Tamper to Mixture Considering Shock Load[J]. Journal of Southwest Jiaotong University, 2022, 57(6): 1277-1283. doi: 10.3969/j.issn.0258-2724.20210795

冲击载荷下摊铺机振捣机构对混合料的压实特性

doi: 10.3969/j.issn.0258-2724.20210795
基金项目: 陕西省自然科学基金(2022JQ-572);中央高校基本科研业务费专项资金(300102250305);中国博士后科学基金(2019M663603)
详细信息
    作者简介:

    贾洁(1990—),女,讲师,博士,研究方向为工程机械作业质量控制,E-mail:jiajie@chd.edu.cn

  • 中图分类号: U415.52

Compaction Characteristics of Paver Tamper to Mixture Considering Shock Load

  • 摘要:

    为了提高沥青摊铺机对铺层混合料的初始密实度,针对振捣机构动力学特征,考虑振捣冲击载荷对混合料的影响,建立了铺层材料密实度与振动参数、系统参数之间关系仿真模型,剖析振捣机构对混合料密实度与动态响应关系,揭示振捣压实特性机理. 进行振捣机构对混合料摊铺密实效果的试验研究,得到振捣频率对材料密实度的影响特性曲线,通过不同阻尼参数下的模型分析,确定了振捣峰值密实度出现时的最佳振捣频率,同时对振捣密实度随各谐波频率的变化规律进行仿真计算和试验验证. 研究结果表明:当频率比小于最佳振捣频率比时,密实度对振捣频率变化敏感,随着频率的增加,铺层密实度变化平缓,仿真与试验结果变化规律基本一致;当振捣频率接近最佳振捣频率时,除了与激励频率相同的稳态响应外,还存在频率为2倍激励频率的振动成分;当匹配振捣频率比大于0.45时,会产生高效密实效果. 研究结果可为摊铺机实现对铺层混合料的高效压实提供依据.

     

  • 图 1  冲量作用下的振捣压实系统

    Figure 1.  Compaction system with impulse load

    图 2  单位脉冲响应曲线

    Figure 2.  Impulse response curve caused by a tamper

    图 3  周期振捣冲击

    Figure 3.  Periodic shock wave of tamper

    图 4  周期振捣冲击波频谱

    Figure 4.  Spectrum of periodic shock wave

    图 5  振捣幅值放大因子变化曲线

    Figure 5.  Amplitude amplification factor curves of a tamper wave

    图 6  多级振捣幅值放大因子变化曲线

    Figure 6.  Amplitude amplification factor curves of multi-series tamper wave

    图 7  传感器位置示意

    Figure 7.  Schematic of sensor location

    图 8  混合料级配数据

    Figure 8.  Gradation data of mixture

    图 9  无核密度仪工作原理

    Figure 9.  Operational principle of nuclear density

    图 10  振捣密实度随频率的变化曲线

    Figure 10.  Compactness-frequency curve of tamper

    图 11  仿真与试验对比

    Figure 11.  Comparison of simulation and test results

    表  1  密实度增长量

    Table  1.   Density increment

    振捣频率/Hz密实度/%密实度增量/%密实度增长系数
    584.782.430.489
    1087.963.180.318
    1589.941.020.068
    2090.720.780.039
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出版历程
  • 收稿日期:  2021-10-14
  • 修回日期:  2022-02-01
  • 网络出版日期:  2022-10-09
  • 刊出日期:  2022-03-05

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