基于EDEM的沥青混合料搅拌仿真研究

发布时间：2019-01-22 11:36

【摘要】：搅拌器作为间歇式搅拌设备的核心工作装置,对混合料搅拌是否均匀将直接影响沥青混合料的生产质量和效率。通过仿真技术研究混合料的搅拌过程不仅有利于对沥青混合料搅拌理论的研究,而且通过调整不同参数可以科学有效地评价搅拌器性能。本文主要通过利用室内搅拌机模型对不同工况下的沥青混合料搅拌过程进行仿真研究。本文在搅拌机理的基础上,对沥青混合料搅拌过程进行分析。研究了沥青混合料搅拌均匀性的影响因素,结果表明选择合理的转速、充盈率和搅拌时间才能保证沥青混合料的搅拌均匀性,为确保搅拌均匀性就要对搅拌器搅拌过程中的不同参数进行对比研究。通过Creo2.0对室内搅拌机中的搅拌器进行了三维建模,使用离散元仿真软件EDEM对不同搅拌参数情况下的搅拌系统进行模拟仿真,根据仿真结果对混合料搅拌均匀性进行分析,得出当充盈率为30%,转速为75rpm时混合料的搅拌均匀性最好。对掺加颗粒型改性剂的混合料进行搅拌仿真,分析不同转速下混合料中各粒径分布的均匀情况,对掺加颗粒型改性剂是否影响各粒径颗粒均匀分布进行了分析。利用沥青与集料间的表面能,通过EDEM对实现物料间有粘结功能的JKR接触模型进行API编译,展开对沥青混合料的仿真分析;验证此工况下沥青混合料的均匀性;得到在此条件下大颗粒间有粘结力的“湿拌”比无粘力的“干拌”时具有更好的均匀性。
[Abstract]:Agitator is the core working device of batch mixing equipment. Whether mixture mixing is uniform or not will directly affect the production quality and efficiency of asphalt mixture. The study of mixing process through simulation technology is not only beneficial to the study of mixing theory of asphalt mixture, but also can be used to evaluate the performance of agitator scientifically and effectively by adjusting different parameters. In this paper, the mixing process of asphalt mixture under different working conditions is simulated by using indoor mixer model. On the basis of mixing mechanism, this paper analyzes the mixing process of asphalt mixture. The factors influencing the mixing uniformity of asphalt mixture are studied. The results show that the mixing uniformity of asphalt mixture can be ensured only by selecting reasonable rotational speed, filling rate and stirring time. In order to ensure the homogeneity of agitator, the different parameters of agitator must be compared and studied. The agitator in the indoor mixer is modeled by Creo2.0, and the mixing system under different mixing parameters is simulated by the discrete element simulation software EDEM, and the mixture mixing uniformity is analyzed according to the simulation results. The mixture has the best mixing uniformity when the filling ratio is 30 and the rotational speed is 75rpm. The mixture mixed with granular modifier was stirred and simulated, and the uniformity of particle size distribution in the mixture was analyzed under different rotational speeds, and whether the mixed particle type modifier affected the uniform distribution of particle size was analyzed. Using the surface energy between asphalt and aggregate, the JKR contact model with binder function is compiled by API through EDEM, the simulation analysis of asphalt mixture is carried out, and the uniformity of asphalt mixture is verified under this condition. The results show that the "wet mixing" has better homogeneity than the "dry mixing" with large particles under these conditions.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U414

【参考文献】