CAJ | 학술논문

工程机械中存在大量的滑动伸缩机构接触问题，对此类问题进行分析的最有效方法是有限元法，但是对于大型复杂机械进行整机分析时面临着计算耗时过长和计算不易收敛等问题，为提高分析效率，采取先整体后局部的两步分析法，即从整体粗网格模型分析结果提取局部子模型位移边界条件，然后将其施加到细网格局部子模型上来分析详细局部接触部位应力的求解策略。以某一实际设计的高空作业车伸缩臂间滑动接触结构分析为例实施了两步法分析过程，在获得相近局部分析精度的条件下，采用整体‐局部两步分析法比用细网格整体模型求解显著提高求解效率。
공정궤계중존재대량적활동신축궤구접촉문제，대차류문제진행분석적최유효방법시유한원법，단시대우대형복잡궤계진행정궤분석시면림착계산모시과장화계산불역수렴등문제，위제고분석효솔，채취선정체후국부적량보분석법，즉종정체조망격모형분석결과제취국부자모형위이변계조건，연후장기시가도세망격국부자모형상래분석상세국부접촉부위응력적구해책략。이모일실제설계적고공작업차신축비간활동접촉결구분석위례실시료량보법분석과정，재획득상근국부분석정도적조건하，채용정체‐국부량보분석법비용세망격정체모형구해현저제고구해효솔。
The contact between the adjacent booms of the mechanical telescopic system on construction machinery is a commonly existing problem needs to be dealt with rationally and the most effective way to solve it is through the finite element(FE) analyses .However ,for large scale engineering machines ,analysis of the w hole structures needs too long computing time and in many cases the solution is hard to converge . In order to increase the computational efficiency ,this paper adopted a two‐stage solution strategy ,i .e ., analysis of the global FE model with very coarse mesh is carried out first to derive the local boundary con‐ditions for sub‐models w hich only contain the geometry of the local contact regions of the adjacent booms . As the sub‐models only model a small fraction of the whole machine ,sufficient fine FE meshes could be used to yield accurate local contact stress results with less computational resources .An example analysis of a practical design using the efficient computational strategy has been implemented .The global‐local two‐stage method was found to be much more efficient than the modeling the entire machine using fine FE mesh for achieving comparable local contact stress accuracy .