土工格栅在治理沥青路面裂缝中的应用

裂缝是沥青路面常见病害。应用非织造土工织物——多功能双向土工格栅治理高等级公路沥青路面的裂缝,取得了良好的效果,并对土工格栅的应用进行了定量计算。     

石河道大桥桩基础施工

针对卵石地层桩基础成孔问题,根据石河道大桥实际施工实践介绍了应用冲击钻孔的方法加以解决的施工方法,并着重分析了该方法的工艺流程和内容,以及施工中的注意事项.     

关于铁路货车L-B型制动梁制造工艺的探讨

重点从魏氏组织、原材料化学成分和焊接性能等3个方面论述了影响制动梁梁架机械性能的主要因素,对梁架加工过程中产生不合格的原因进行了分析,并提出了改进建议。     

客运专线连续梁桥墩线刚度限值探讨

研究目的:近年来,连续梁已成为新建铁路及客运专线的常用梁型。新建铁路一次性铺设跨区间之缝线路已成为趋势,研究连续梁桥上无缝线路纵向力变化规律,探讨客运专线常见连续梁桥墩线刚度限值迫在眉睫。研究结果:提出客运专线常见连续梁桥墩线刚度限值,可指导桥梁和轨道的前期设计。     

基于杆梁模型的舰船隔振系统功率流传递特性分析

针对舰船中比较典型的静不定隔振系统，建立了柔性基础上安装4个隔振器的隔振系统物理模型。对隔振器采用杆梁模型建模，隔振上层设备采用刚体模型，导出了静不定隔振系统的动力控制方程。使用振动功率流方法对隔振系统进行了功率流分析，并利用Matlab进行编程计算，计算结果表明杆梁模型隔振器对上下两端的功率流的减少有明显效果，隔振器的内部共振特性对隔振系统振动功率流具有显著的影响。对主要设计参数进行了讨论，得出了具有工程指导意义的结论。     

FRP正弦波形夹心桥面板的等效有限元模型

以FRP正弦波形夹心桥面板作为研究对象,得到等效正交各项异性实心板,通过理论分析和数值对比,证明了方法的可行性;采用该法对一实际的FRP正弦波形夹心板桥进行了模态分析。     

Determination of Critical Slip Surface of Soil Slope

A new complex method is presented considering not only the improvement upon the ＂bad ＂design point, but also the diversity of the newly generated complex, which is obtained by replacing the ＂bad ＂design point with the better design point located at the line between the ＂bad ＂design point and the ceotroid of the remaining design points of the old complex. The new complex method is applied to searching for the critical slip surface of two non-homogeneous soil slopes. The comparison of the results obtained by the new complex method with that by the basic complex method shows that the new complex method is much more likely to find the true critical surface for the randomly generated initial complex.     

基于ANN星识别算法的仿真平台

星敏感器是一种高精确度的姿态测量仪器，它通过对观测到的星点进行识别来计算姿态。为了能够较好地测试和验证星识别系统的性能，设计了一个基于ANN算法的星识别仿真平台。通过对该星识别仿真平台性能的测试，表明该仿真平台能够方便，实时地测试星识别算法的性能与正确性，因此说它是一种具有较好实用价值的星识别仿真平台。     

洛卢公路洛河大桥设计简介

介绍了洛卢公路洛河大桥所采用的技术标准、桥型、截面型式及结构计算,并介绍了该桥设计在构造上所做的特殊处理及施工要点。     

Mixed analysis of shell and solid elements using the overlaying mesh method

 This article presents a mixed method of analyzing shell elements and solid elements using the overlaying mesh method. In the structural design of a ship's hull, the shell elements are used for the global model. However, the solid elements are necessary to analyze the stress concentration zones or the vicinity of a crack. In such cases, the models are analyzed using zooming analysis, in which the results of a global model analysis are transferred to a local model analysis by imposing boundary conditions. This method is more advantageous than zooming analysis in terms of the accuracy of the solution and the modeling flexibility. Some examples of a plate model with a cracked surface or with a projection are shown in order to demonstrate the effectiveness of the method. Received: August 6, 2002 / Accepted: November 25, 2002 Address correspondence to: S. Nakasumi (sumi@nasl.t.u-tokyo.ac.jp) Updated from the Japanese original, which won the 2002 SNAJ prize (J Soc Nav Archit Jpn 2001;189:219–224; and 190:655–662)