Combined shape and sizing optimization of truss structures

 In this paper, an evolutionary optimization method is presented for weight minimum problem of a 3-dimensional truss structure in terms of nodal coordinates and element cross-sectional areas. The structure is subject to stress, local buckling and displacement constraints. Two types of design variables with different natures are optimized separately: (1) a fully stressed design (FSD) and scaling techniques are applied to sizing variables and (2) the evolutionary node shift method is applied to shape variables. Alternating procedure is utilized to couple the two types of variables and to combine the results. The optimum solution is achieved gradually from the initial configuration design. Two typical truss structures are examined to illustrate the validity of the method. Received: 22 October 2001 / Accepted: 04 June 2002 This research work is supported by the National Natural Science Foundation of China under the guarantees no. 10072050 and 10172072, respectively.     

螺旋管簧的可靠性优化设计

讨论了螺旋管簧的可靠性优化设计问题。在基本随机变量的概率特性已知的情况下，采用二阶矩法和可靠性优化设计方法对螺旋管簧进行了可靠性优化设计。通过计算机程序可以直接实现螺旋管簧的可靠性优化设计，迅速准确地得到螺旋管簧的可靠性优化设计信息。     

关于子母鱼雷的设想

概述了子母鱼雷这一新型鱼雷的设计基本依据的特点，论述了该鱼雷的作战使命与设计方案，叙述了发展子母鱼雷的必要性和可行性。     

回归分析法简化钻爆设计

以某工程钻爆参数为例,阐述了在地下工程掘进施工中,应用回归分析法建立钻爆参数的相关模型,并利用此模型帮助建立某断面钻爆方案.     

堤身的数据采集及断面设计的几点建议

针对堤防设计的基础资料采集和设计优化，提出了一些合理性建议。     

后桥壳的可靠性优化设计

该文讨论了后桥壳的可靠性优化设计问题.在基本随机变量的概率特性已知的情况下,应用随机摄动法和约束随机方向法对后桥壳进行可靠性优化设计,并编制了实用的计算机程序,可以迅速准确地得到后桥壳的可靠性设计参数.     

Influence of load and speed on wear characteristics of grey cast iron in dry sliding — selection for minimum wear

The wear of grey cast iron in dry sliding conditions has been studied with the aims of (1) finding the influence of working conditions on the wear rate, and (2) determining the region of speed and load where low wear is accomplished. Grey cast iron with flake and nodular graphite was submitted to investigation using a pin-on-disc machine. The results indicate that the flake graphite cast iron is more suitable for applications at speeds greater than 4 m s⁻¹ and lower loads, while nodular cast iron has greater wear resistance at lower speeds in the range of loads investigated - from 50 N cm⁻² to 200 N cm⁻²     

活动式水冷撇渣器的设计及应用

活动式水冷撇渣器是根据高炉冷却壁的工作原理设计的。第一台活动式水冷撇渣器于１９９３年２月２７日在安钢４号高炉投入运行，使用寿命长达１７个月零１８天，通铁量达到４０万ｔ。这种活动式水冷撇渣器具有投产少，收益高，维修方便，安全可靠等优点。     

铝合金高速船船体建造工艺

简述了ＬＦ１５和ＬＦ１６两种新型船用耐蚀可焊铝合金及其配套焊接材料在实船建造中的应用情况。阐述了铝合金全焊结构船体建造的关键技术及我国铝船体建造的３种方法     

计算机辅助设计中浓淡曲线的设计

本文介绍利用Super Frame软件进行色彩浓淡设计的原理、方法和步骤。据此原理和方法,使用C语言设计开发出了应用实例——折线浓淡分布曲线。