华南理工大学学报(自然科学版)
華南理工大學學報(自然科學版)
화남리공대학학보(자연과학판)
Journal of South China University of Technology(Natural Science Edition)
2015年
8期
75-81
,共7页
固体力学%有限元%离散元%行驶行为
固體力學%有限元%離散元%行駛行為
고체역학%유한원%리산원%행사행위
solid mechanics%finite element%discrete element%running behavior
介绍了离散元与有限元耦合方法(FEM/DEM)的基本原理,提出了对应轮胎-沙地接触计算的Slave区域自适应定义方法.基于室内土槽实验,建立了轮胎-沙地相互作用的三维仿真模型(不考虑轮胎变形),其中,沙地使用球形离散单元(DE)模拟,土槽、轮胎使用六面体有限单元(FE)描述.然后,采用基于FEM/DEM的自主开发软件CDFP对光面和人字形沟槽两种胎面结构轮胎在沙地的行驶行为进行仿真,通过光面轮胎仿真结果与相应实验结果的对比,验证了该方法的可行性和有效性.对比两种胎面结构轮胎的仿真结果(法向反作用力、挂钩牵引力等),解释了越野轮胎开凿沟槽的必要性.
介紹瞭離散元與有限元耦閤方法(FEM/DEM)的基本原理,提齣瞭對應輪胎-沙地接觸計算的Slave區域自適應定義方法.基于室內土槽實驗,建立瞭輪胎-沙地相互作用的三維倣真模型(不攷慮輪胎變形),其中,沙地使用毬形離散單元(DE)模擬,土槽、輪胎使用六麵體有限單元(FE)描述.然後,採用基于FEM/DEM的自主開髮軟件CDFP對光麵和人字形溝槽兩種胎麵結構輪胎在沙地的行駛行為進行倣真,通過光麵輪胎倣真結果與相應實驗結果的對比,驗證瞭該方法的可行性和有效性.對比兩種胎麵結構輪胎的倣真結果(法嚮反作用力、掛鉤牽引力等),解釋瞭越野輪胎開鑿溝槽的必要性.
개소료리산원여유한원우합방법(FEM/DEM)적기본원리,제출료대응륜태-사지접촉계산적Slave구역자괄응정의방법.기우실내토조실험,건립료륜태-사지상호작용적삼유방진모형(불고필륜태변형),기중,사지사용구형리산단원(DE)모의,토조、륜태사용륙면체유한단원(FE)묘술.연후,채용기우FEM/DEM적자주개발연건CDFP대광면화인자형구조량충태면결구륜태재사지적행사행위진행방진,통과광면륜태방진결과여상응실험결과적대비,험증료해방법적가행성화유효성.대비량충태면결구륜태적방진결과(법향반작용력、괘구견인력등),해석료월야륜태개착구조적필요성.
In this paper, the basis of the combined finite and discrete element method ( FEM/DEM ) is intro-duced, and an adaptive Slave region method is proposed according to the FEM/DEM simulation of tire-sand interac-tions.Moreover, the three-dimension simulation models of tires running on sand are constructed based on a soil bin experiment with the tire deformation being neglected, where the sand is modeled by using spherical discrete ele-ments, the soil bin and the tires are discretized into hexahedron finite elements.Then, the running behaviors of the smooth and groove tires on sand at different slip ratios are simulated by using the self-developed software CDFP, which is an explicit combined discrete-finite element program.The simulation results of the smooth tire are com-pared with the corresponding experimental ones, thus verifying the feasibility and effectiveness of the proposed method.In addition, the comparison of the simulation results ( such as road reaction force and tire drawbar pull) of the smooth and groove tires explains the necessity of the grooves of off-road vehicle tires.