DNV GL新规范对大型集装箱船结构设计的影响

从总纵强度、舱段有限元和典型结构局部强度三个方面解析了DNVGL规范与GL规范在集装箱船结构方面的内容差异。以一艘14500TEU集装箱船为算例，分析了DNVGL规范对大型集装箱船结构设计的影响。结果表明，DNVGL规范对于集装箱船的总纵强度和舱段有限元提出了更高的要求，而在压载舱边界结构和艏部砰击方面的要求相对于GL规范有所降低，存在一定的优化空间。     

DETERMINING THE CONTENT OF JASMINODIN IN MEI RONGCAPSULE WITH THIN LAYER CHROMATOGRAPHY

Cardenia Jasminoides may bring about the ef-fects of laxative, being antipyretic, diuresis detoxi-cation, and anti--inflammation[1J. It has been provedthat the main active component of Cardenia Jas-minodin Eills is the iridoid glycosides representedby Jasminodin['.'J. Recently, with the improvementof people's living conditions in China,Cardenia Jas-minodin Eills has been applied in several kind ofcosmetics and proved to be effective in eliminatingacnes, disinfecting and beautifying the ski…     

Numerical study on the effect of current profiles on vortex-induced vibrations in a top-tension riser

In this paper, numerical simulations of vortex-induced vibrations in a vertical top-tension riser with a length-to-diameter ratio of 500 using our in-house code viv-FOAM-SJTU are presented. The time-dependent hydrodynamic forces on two-dimensional strips are obtained by solving the Navier-Stokes equations, which are, in turn, integrated into a finite-element structural model to obtain the riser deflections. The riser is discretized into 80 elements with its two ends set as pinned and 20 strips are located equidistant along the risers. Flow and structure are coupled by hydrodynamic forces and structural displacements. In order to study the effects of the shear rate, of the current profiles on the vortex-induced vibrations in the riser, vibrations, with varying shear rates, in both the in-line and cross-flow directions, are simulated. In addition to the time domain analysis, spectral analysis was conducted in both the temporal and spatial domains. Multi-mode vibration characteristics were observed in the riser. The relationship between dominant vibration mode number and the shear rate of current profiles is discussed. In general, the overall vibrations in the riser pipe include contributions from several modes and each mode persists over a range of shear rates. Moreover, the results suggest that with a larger shear rate the position of the maximum in-line time-averaged displacement will move closer to the end where the largest velocity is located.     

三相三重斩波电路的建模和仿真研究

阐述了三相三重斩波电路的工作原理,并且给出其在MATLAB/Simulink中的仿真模型和仿真结果,仿真结果表明其输出电流为单个斩波电路平均电流的三倍,而且其电流脉动频率为单个斩波电路的三倍。     

基于5D-BIM的高桩码头工程施工进度-成本实时控制

针对目前基于二维施工图的高桩码头施工现场控制存在工程量计算耗时长、数据处理实时性差等问题,进行了基于5D-BIM(5 Dimensions-Building Information Modeling)的高桩码头工程施工过程控制研究,通过5D-BIM系统高效搜集整理大量数据的能力、强大的交互功能,实现了快速、准确的工程成本测算以及直观的实时进度四维动态显示,为动态、实时、高效地控制高桩码头施工进度-成本提供了有效的手段。     

地层注浆加固对隧道与地下水相互作用过程中的“双赢”影响效应分析

目前山岭隧道大多采用的"半包"防水方式,可较为有效地降低衬砌背后水压荷载作用,但同时造成地下水资源的大量流失。文章通过建立隧道瞬态渗流模型,分析了"半包"防水条件下隧道施工及运营过程中隧道排水流量及水位变化规律,以及运营过程中衬砌背后水压力分布规律;研究了帷幕注浆和径向注浆两种方式不同工况下不同注浆范围及参数对排水流量、水位变化及衬砌水压荷载的影响效应。数值分析结果和工程实践表明,地层注浆加固既可降低衬砌背后水压荷载,又可减少地下水资源流失量,从而可以实现隧道与地下水相互作用过程中的"双赢"影响效应。文章最后对"半包"防水条件下仰拱是否设置排水系统进行了分析探讨。     

多目标模糊决策在软土地基加固方案中的应用

针对软土地基加固方案的影响因素具有模糊性这一特点,运用模糊数学理论,对定性指标量化,利用层次分析法确定评价因素的权重,提出采用模糊综合评价法对加固方案选优,并结合实例进行验证分析。     

基于IPSO-Capsule-NN模型的中欧班列出口需求量预测

为提高中欧班列出口需求量的预测精度,提出将改进粒子群算法(IPSO)与胶囊神经网络(Capsule-NN)相结合的预测模型(IPSO-Capsule-NN)。与全连接神经网络不同,胶囊神经网络通过动态路由算法增强了模型的拟合能力和泛化能力。利用改进粒子群算法优化胶囊神经网络的神经元数量、迭代次数以及学习率,以克服人为设定模型参数随机性较大导致模型精确度不高的不足之处。此外,针对标准粒子群算法存在的缺点,提出一种非线性递减惯性权重并引入Levy飞行对粒子群算法的全局寻优能力和收敛速度进行优化。将采用spearman秩相关性分析得到的11个因素作为中欧班列出口需求量的影响因素并对其进行预测,结果表明:胶囊神经网络具有2层隐含层时,IPSO-Capsule-NN模型预测精度更高。     

某型舰炮模拟训练系统的模糊综合评判

科学合理的评估能正确反映训练效果,对提高模拟训练效率和效益都有着重要意义。针对某大型复杂舰炮模拟训练效果综合评价问题,通过对影响模拟训练成绩各因素相互关系和重要程度的全面分析,运用层次分析法与模糊综合评判法相结合的方法,建立了模拟训练评价的指标体系,给出了某型舰炮模拟训练系统的综合评判模型和评判方法,并通过应用实例和程序验证了该模型和方法对评估的可行性和实用性。     

中梁山隧道穿越石膏段施工技术研究

文章依托重庆市轨道交通一号线中梁山隧道,对石膏地层的工程特性进行了分析研究,详细地介绍了中梁山隧道安全通过石膏地层段的施工技术;并采用数值模拟手段对施工方案进行了研究,为膨胀性围岩隧道工程设计及施工积累了经验.