西北工业大学学报
西北工業大學學報
서북공업대학학보
JOURNAL OF NORTHWESTERN POLYTECHNICAL UNIVERSITY
2013年
3期
498-502
,共5页
王庆%徐斌%赵普猛
王慶%徐斌%趙普猛
왕경%서빈%조보맹
固有频率%灵敏度分析%最速下降法%拓扑%桁架%固频极值%虚拟材料法
固有頻率%靈敏度分析%最速下降法%拓撲%桁架%固頻極值%虛擬材料法
고유빈솔%령민도분석%최속하강법%탁복%항가%고빈겁치%허의재료법
natural frequencies%sensitivity analysis%steepest descent method%topology%trusses%Extremum of natural frequency%virtual material
基于固频约束时结构动力学拓扑优化的关键约束,提出了一种求解桁架结构固频极值的新方法---基于虚拟材料法的优化计算方法,从节点设计变量和杆件截面积两个层次进行灵敏度分析以进一步优化计算,将拟删除节点相对应的杆件材料特性进行重新赋值,通过极值求解算法以迭代计算得到固频极值。数值算例结果表明所提方法正确、有效。
基于固頻約束時結構動力學拓撲優化的關鍵約束,提齣瞭一種求解桁架結構固頻極值的新方法---基于虛擬材料法的優化計算方法,從節點設計變量和桿件截麵積兩箇層次進行靈敏度分析以進一步優化計算,將擬刪除節點相對應的桿件材料特性進行重新賦值,通過極值求解算法以迭代計算得到固頻極值。數值算例結果錶明所提方法正確、有效。
기우고빈약속시결구동역학탁복우화적관건약속,제출료일충구해항가결구고빈겁치적신방법---기우허의재료법적우화계산방법,종절점설계변량화간건절면적량개층차진행령민도분석이진일보우화계산,장의산제절점상대응적간건재료특성진행중신부치,통과겁치구해산법이질대계산득도고빈겁치。수치산례결과표명소제방법정학、유효。
Because frequency constraint is the key constraint for dynamic topology optimization of truss , in this pa-per, a new method for extremum calculation of natural frequency for truss is put forward ---an optimization method based on virtual material.It is optimized in two levels with sensitivity analysis; there are nodal design variables and cross-section area variables of truss elements, the bars related to the removed nodes being assigned new material properties; then the extremum of natural frequency is calculated with steepest descent method (SDM).The results of a numerical example and their analysis show preliminarily that the proposed method is correct and effective .