基于离散元法的沥青混凝土振动切削过程的数值模拟

发布时间：2018-08-28 20:37

【摘要】：铣刨机作为沥青混凝土路面的重要养护机械,其需求量不断增长,国内自主研发高性能铣刨机已刻不容缓。数值模拟可以直观量化表达铣刨作业中铣刨刀具的受力情况,已经成为研究铣刨机整体性能的重要手段。基于三维离散元法建立符合宏观力学性能的路面模型,建立铣刨作业模型仿真量化铣刨作业过程的铣刨阻力,采用单轴压缩和劈裂抗拉试验测定沥青混凝土路面的抗压模量和抗拉模量,获得校核微观接触连接参数的宏观标准。利用三维离散元软件PFC3D编写算法生成具有不规则形状粗集料的离散元试件。通过建立运动学模型推导振动铣刨的临界条件表达式,研究附加不同振动方式对作业过程受力的改进情况,从而计算出铣刨机振动铣刨振幅和振频的优化组合数值,获得铣刨机较优的激振方式。
[Abstract]:As an important maintenance machine for asphalt concrete pavement, the demand of milling machine is increasing, so it is urgent to develop high performance milling machine in our country. Numerical simulation can directly and quantitatively express the mechanical condition of the milling cutter in the milling and planing operation, and has become an important means to study the overall performance of the milling machine. Based on the 3D discrete element method, the road surface model which accords with the macroscopic mechanical properties is established, and the milling and planing resistance of the milling process is quantified by the simulation of the milling and planing model. The compressive modulus and tensile modulus of asphalt concrete pavement were measured by uniaxial compression and splitting tensile test. Three dimensional discrete element software PFC3D is used to generate discrete element specimen with irregular shape coarse aggregate. By establishing kinematics model, the critical condition expression of vibration milling planer is derived, and the improvement of the working process force by adding different vibration modes is studied, so as to calculate the optimum combination value of vibration milling planer amplitude and vibration frequency. The optimal excitation mode of milling machine is obtained.
【作者单位】：湘潭大学机械工程学院;
【基金】：湖南省自然科学联合基金(2016JJ5025) 湖南省教育厅平台基金(15K129)资助项目
【分类号】：U418.32

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