摘要
针对垂直激振下土壤的恢复力与变形之间的不对称滞回特性,采用多线段不对称滞回模型,建立含该模型的2自由度压实系统动力学模型,通过谐波线性化计算滞回力的等效刚度及等效阻尼。通过数值仿真的方法 ,研究压实进程中激振频率、激振力幅和土壤参数对振动轮动响应的影响特性。仿真结果表明:压实终期采取低振幅高频激振,可避免振动轮产生跳振现象,使压实土壤受到冲击破坏,从而保证压实质量和提高压实效率。
A 2-DOF dynamic model of compaction system was established in terms of segmented line model aiming at the asymmetrical hysterics of resilience against displacement during the vibratory compaction under vertical excitation, The equivalent stiffness and damping of hysteretic force were calculated according to the harmonic linearization. The influence of excitation amplitude-frequency and soil parameters on the response of vibratory drum was analyzed. The simulation results revealed that low-amplitude and high-frequency excitation was adopted in the final compaction. This could void the jump- vibration motion of drum and shock damage of compaction soil, so as to ensure the compaction quality and improve its efficiency.
作者
郑书河
代群华
林述温
ZHENG Shu-he DAI Qun-hua LIN Shu-wen(College of Mechanical Electrical Engineering ＆ Automation, Fujian Agriculture and Forestry University, Fuzhou 350002 College of Mechanical Engineering ＆ Automation, Fuzhou University ,Fuzhou 550108)
出处
《机械设计》
CSCD
北大核心
2016年第9期87-91,共5页
Journal of Machine Design
基金
国家自然科学基金资助项目(51175086)
福建省自然科学基金资助项目(2013J01171)
福建省教育厅资助项目(JB13056)
关键词
不对称滞回特性
垂直激振
谐波线性化
非线性响应特性
asymmetrical hysterics
vertical excitation
harmonic linearization
nonlinear response characteristics
