The Report on the Outline of the Fifth Five-year Plan for the Development of National Economy and Society"(hereafter called THE OUTLINE) points out: "Our national economy has reached a period in which, if no...The Report on the Outline of the Fifth Five-year Plan for the Development of National Economy and Society"(hereafter called THE OUTLINE) points out: "Our national economy has reached a period in which, if not adjusted, it cannot develop anymore" ; "In the coming five years, we must cast emphasis upon industrial structure adjustment and area adjustment, and city-village adjustment, and especially take ISA as the anchor job". It further indicates the tasks of ISA in the Tenth Five-year -plan years, that is, to consolidate and strengthen the foundation position of agriculture, quicken industrial regrouping and reform on the one hand and industrial structural optimalizatin upgradeon the other, devote major efforts to developing service industry, speed up informationization of the national economy and society, and continue to throw more strength into the construction of basic facilities". THE OUTLINE also directs our attention to the fact that "both economic growth and structural adjustment have to be pushed by system creation and STI [science-technoiogy innovation]". Such being the case, you might ask: "What are the characteristics of ISA in the Tenth Five-year-plan period? What are its meanings in sgtrategy? How to drive ISA by STI ? How to use it, in return, to accelerate STI?"This treatise will, mainly from the aspect of the relationship between STI and ISOU, make a preliminary analysis of those problems.展开更多
针对某机床结构薄弱件立柱的结构优化设计,提出了一种基于拓扑优化、筋板形式选择与布局以及尺寸优化的结构设计方法。首先利用有限元法(finite element analysis,FEA)对机床整机进行动力学分析,模态分析与谐响应分析结果表明立柱为影...针对某机床结构薄弱件立柱的结构优化设计,提出了一种基于拓扑优化、筋板形式选择与布局以及尺寸优化的结构设计方法。首先利用有限元法(finite element analysis,FEA)对机床整机进行动力学分析,模态分析与谐响应分析结果表明立柱为影响整机动态性能的关键结构件。然后以立柱结构为优化目标,对立柱进行拓扑优化,根据拓扑优化的材料分布情况设计了立柱的最优基本结构形式,再通过选择抗弯、抗扭刚度较好的W类型筋板进行布局与尺寸优化,得到了最终的立柱优化结构。最后对优化的立柱结构进行验证,分析结果表明:该结构设计方法有效地改善了整机的动态性能,在立柱质量减轻的前提下,优化后的整机前六阶固有频率均得到了不同程度的提高,其中一阶固有频率提高了10%以上;并且机床在x方向上的最大共振峰值下降了49.8%,y方向下降了70.1%,z方向下降了66.2%。展开更多
文摘The Report on the Outline of the Fifth Five-year Plan for the Development of National Economy and Society"(hereafter called THE OUTLINE) points out: "Our national economy has reached a period in which, if not adjusted, it cannot develop anymore" ; "In the coming five years, we must cast emphasis upon industrial structure adjustment and area adjustment, and city-village adjustment, and especially take ISA as the anchor job". It further indicates the tasks of ISA in the Tenth Five-year -plan years, that is, to consolidate and strengthen the foundation position of agriculture, quicken industrial regrouping and reform on the one hand and industrial structural optimalizatin upgradeon the other, devote major efforts to developing service industry, speed up informationization of the national economy and society, and continue to throw more strength into the construction of basic facilities". THE OUTLINE also directs our attention to the fact that "both economic growth and structural adjustment have to be pushed by system creation and STI [science-technoiogy innovation]". Such being the case, you might ask: "What are the characteristics of ISA in the Tenth Five-year-plan period? What are its meanings in sgtrategy? How to drive ISA by STI ? How to use it, in return, to accelerate STI?"This treatise will, mainly from the aspect of the relationship between STI and ISOU, make a preliminary analysis of those problems.
文摘针对某机床结构薄弱件立柱的结构优化设计,提出了一种基于拓扑优化、筋板形式选择与布局以及尺寸优化的结构设计方法。首先利用有限元法(finite element analysis,FEA)对机床整机进行动力学分析,模态分析与谐响应分析结果表明立柱为影响整机动态性能的关键结构件。然后以立柱结构为优化目标,对立柱进行拓扑优化,根据拓扑优化的材料分布情况设计了立柱的最优基本结构形式,再通过选择抗弯、抗扭刚度较好的W类型筋板进行布局与尺寸优化,得到了最终的立柱优化结构。最后对优化的立柱结构进行验证,分析结果表明:该结构设计方法有效地改善了整机的动态性能,在立柱质量减轻的前提下,优化后的整机前六阶固有频率均得到了不同程度的提高,其中一阶固有频率提高了10%以上;并且机床在x方向上的最大共振峰值下降了49.8%,y方向下降了70.1%,z方向下降了66.2%。
