共查询到20条相似文献，搜索用时 62 毫秒
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利用MATLAB优化工具箱可方便求解机械产品多目标约束优化设计问题,机械产品可靠性优化设计涉及零部件结构优化设计、实体建模和设计结果的有限元分析等等,需要多学科设计专家在异构的网络环境下远程协作。异构环境下的设计主体有可能采用不同的异构CAX系统,Web、CORBA、多Agent技术集成以及Matlab与协同设计系统的集成是解决系统异构的关键。 相似文献
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分析了机械优化设计中忽略机械零部件模糊因素的缺限,给出了机械优化设计考虑模糊性的模型描述及计算方法,详细地介绍了模糊优化的隶属函数的建立方法以及如何采用最优水平截集对其进行优化,并通过实例计算的两种设计结果的比较,说明模糊优化设计更符合客观实际。 相似文献
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机床主轴结构优化设计 总被引：2，自引：0，他引：2
介绍了机械优化设计理论的基本思想及其求解方法，将其应用于机床主轴的结构设计，建立了机床主轴结构优化设计的数学模型，并用内点惩罚函数法求解模型，得到了整体最优的结构设计方案，使机床主轴在满足各种约束要求条件下，刚度最好，材料最省。文中结合一实例分析其优化设计全过程。实例证明优化理论在机械设计中具有实用价值。 相似文献
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刘长佑 《宿州教育学院学报》2006,9(5):112-114
介绍了ANSYS优化设计方法,并针对机械结构优化设计给出了具体设计方法,利用实例分析介绍ANSYS在机械结构优化设计中的应用。证明了ANSYS优化设计模块在设计上的方便性和可行性,为从事机械优化设计人员提供了新的方法和思路。 相似文献
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受变载荷螺栓组联接的可靠性优化设计 总被引：2，自引：0，他引：2
承受轴向受变载荷螺栓组联接，是螺栓联接中最重要的一种形式，其设计合理与否直接影响到机械产品的成本、寿命与效益等。本文运用可靠性理论与最优化设计技术，提出了承受轴向受变载荷螺栓组联接的可靠性优化设计方法。文中以压力容器的密封螺栓组为例，讨论了可靠性优化设计数学模型的建立方法。并给出了设计实例。 相似文献
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目的:针对一款依靠压杆自身形变自锁和工作的手动火灾报警按钮的结构特点,为使其满足国标不动作试验要求,并改善应力分布情况,对手动火灾报警按钮中关键零部件进行有限元分析和优化设计。方法:通过Creo建立压杆、压板以及底板的装配模型,模拟实验的过程对模型进行约束和载荷的施加,使用Ansys Workbench完成静力学有限元分析,计算出手动火灾报警按钮应力最大值,确定多目标优化设计中目标、变量参数和约束进行,分析出各参数变量对于结果的灵敏度,使用Optimization模块并利用Sceening筛选优化法对关键零部件进行优化设计,在满足国标要求的同时,选取拟合的最优值对压杆进行结构优化。结果:优化后的手动火灾报警按钮压杆受到的最大应力减小19.6%。结论:使用Ansys Workbench软件对零部件进行仿真和优化分析后,提高了产品的强度和研发效率,该研究成果也为后续手动火灾报警按钮压杆设计提供了理论依据。 相似文献
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优化设计资源共享及协同设计系统利用计算机网络技术、CAD技术和数据库技术开发。详述了常见问题优化设计方法、优化设计过程,论述了基于三层B/S模型的系统体系结构、系统模块结构及功能。以多级行星轮系传动比优化分配及优化设计为例,研究分析在线优化设计计算、工程零部件图形绘制方法。 相似文献
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在零件设计中，有两种主要的设计思想：可靠性设计和优化设计，本以连杆螺栓设计为例，讨论了通过建立概率优化设计模型来将两有机结合起来。 相似文献
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机械优化设计为工程设计提供了一种重要的科学设计方法．运用MATLAB优化工具箱,以最小质量和最小轴端位移为目标,对机床主轴进行优化设计,该设计方法简单、实用,主参数优化的结果合理、可靠． 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献