构皮滩第一级升船机电气控制系统总体方案研究

文中针对乌江构皮滩升船机电气系统,从总体规划设计角度,提出了升船机电气设计原则,电气控制网络结构,现地I/O子站的设置,三种控制模式,系统软件与硬件实现,主要流程设计。此总体方案设计已用于乌江构皮滩升船机的电气系统。     

风琴式气压升船机

提出一种双向风琴式气压升船机结构形式，这种气压升船机用压缩空气作为提升承船厢的驱动介质，以取代传统的钢索起重系统或水压系统。运行时不弃水，节约动力，结构简单（仅需安装风机），维修方便。     

乌江思林升船机电气控制系统总体设计与应用

文中针对乌江思林升船机电气系统，从总体规划设计角度，提出了升船机电气设计原则，电气控制网络结构，现地I／O子站的设置，三种控制模式，系统软件与硬件实现，主要流程设计。此总体方案设计已用于乌江思林升船机及乌江沙沱升船机电气系统。     

关于升船机的调查研究

为了解我国升船机工程的现状 ,总结升船机的科研、设计、管理经验 ,并为制订“升船机工程设计规范” ,收集了有关资料 ,进行了现场调查研究活动 ,取得了有意义的成果     

水口电站升船机承船下水观测与思考

本文记录并分析了作为三峡升船机的中间试验工程的水口升船机承船厢下水计算，技术准备和下水过程观测资料。     

景洪水力式升船机运行与检修

水力式升船机是我国具有自主知识产权的新型升船机,目前没有相关的运行与维护标准或规程可供借鉴。基于景洪水力式升船机建设、调试及试通航长期的工程实践,阐述景洪升船机集控与现地、自动与单步等多种运行方式和操作流程,总结升船机运行重点检查事项与安全控制指标,提出设备维护检修重点,可为水力式升船机运行维护管理提供参考。     

Statistical study of lashing forces measured on-board a PCTC vessel

Lashing forces and reaction forces between the car tyres and ship deck were measured on-board a PCTC vessel operating in the North Atlantic and statistically evaluated. A study was done of the characteristics of lashing forces and defined required friction coefficient. The lashing forces and the required friction coefficient were found to be small. The influence of wave direction on the forces was also small.     

船闸输水过程闸室船舶系缆力数值模拟

文章基于“船舶—水流”耦合动力响应,建立了船闸闸室船舶纵向和横向受力方程及其运动控制方程。利用 FLUENT 软件,采用 RNG k-ε三维紊流模型,运用 VOF 法捕捉自由液面,阀门的开启过程及船舶运动利用动网格技术,船舶的运动控制及系缆力的并行计算程序采用用户自定义函数（UDF）进行编写。针对带格栅消能室的船闸集中输水系统,进行了灌水过程的闸室船舶系缆力数值模拟研究,通过与模型试验系缆力过程线的比较,证明了数值方法的正确性和有效性。数值研究了消能室内有无设置辅助消能工情形下的闸室船舶系缆力,并分析了辅助消能工的功能和效果。     

Circular motion tests and uncertainty analysis for ship maneuverability

Circular motion test data and uncertainty analysis results of investigations of the hydrodynamic characteristics of ship maneuvering are presented. The model ships used were a container ship and two tankers, and the measured items were the surge and sway forces, yaw moment, propeller thrust, rudder normal and tangential forces, pitch and roll angles, and heave. The test parameters were the oblique angle and yaw rate for the conditions of a hull with a rudder and propeller in which the rudder angle was set to zero and the propeller speed was set to the model self-propulsion conditions. Carriage data showing the accuracy of the towing conditions in the circular motion test are also presented. It was confirmed that the uncertainties in the hydrodynamic forces such as the surge and sway forces, yaw moment, rudder tangential and normal forces, and propeller thrust were fairly small. The reported uncertainty analysis results of the circular motion test data may be beneficial in validating data quality and in discussing reliability for simulation of ship maneuvering performance.     

Sea trials of Sigma wave energy converter – slacking and snapping of TLP mooring lines

Sigma Energy has performed its foremost prototype tests of scaled wave energy converter in a real sea environment. The prototype was a point absorber with a cylindrical buoy, a mechanical power take-off system with a counterweight, moored to the seabed as a tension leg platform (TLP) with three equal tendons. In these extensive experiments, numerous device characteristics were measured and analysed. The present paper focuses on the dynamic forces in the mooring lines, and some unexpected and rare data obtained. It is well known that TLP tendons are prone to a brief loss of tension (the slacking) and that, after such events, high snapping forces of short duration can arise. Partly by intention, and partly due to underestimation of the dynamical forces, several such slacking-snapping incidents were recorded during the experiments. In some severe storms, the snapping forces were up to six times higher than the tendon pretension. The paper presents several recordings of dynamic forces and platform motion during these critical events. It analysis them, and gives a typical scenario under which they occur. It gives also some theoretical explanations, and numerical predictions of dynamical tendon forces, with their comparison to the experimental results.     

Exciting forces for a wave energy device consisting of a pair of coaxial cylinders in water of finite depth

Two coaxial vertical cylinders-one is a riding hollow cylinder and the other a solid cylinder of greater radius at some distance above an impermeable horizontal bottom,were considered.This problem of diffraction by these two cylinders,which were considered as idealization of a buoy and a circular plate,can be considered as a wave energy device.The wave energy that is created and transferred by this device can be appropriately used in many applications in lieu of conventional energy.Method of separation of variables was used to obtain the analytical expressions for the diffracted potentials in four clearly identified regions.By applying the appropriate matching conditions along the three virtual boundaries between the regions,a system of linear equations was obtained,which was solved for the unknown coefficients.The potentials allowed us to obtain the exciting forces acting on both cylinders.Sets of exciting forces were obtained for different radii of the cylinders and for different gaps between the cylinders.It was observed that changes in radius and the gap had significant effect on the forces.It was found that mostly the exciting forces were significant only at lower frequencies.The exciting forces almost vanished at higher frequencies.The problem was also investigated for the base case of no plate arrangement,i.e.,the case having only the floating cylinder tethered to the sea-bed.Comparison of forces for both arrangements was carried out.In order to take care of the radiation of the cylinders due to surge motion,the corresponding added mass and the damping coefficients for both cylinders were also computed.All the results were depicted graphically and compared with available results.     

近水面潜艇波浪力计算研究评述

对潜艇波浪力计算的研究现状进行了小结。分析了近水面潜艇波浪力计算的几种有代表性的研究方法,如切片法、STF理论、源汇分布法、面元法、Frank源分布紧密拟合法及其组合方法等的具体应用。讨论了目前潜艇波浪力研究中存在的一些问题,尤其是二阶波浪力的非线性特性、潜艇运动扰动及其相互耦合的影响还不清楚,已建立的理论和方法尚不能满足工程实际的需要。最后提出了近水面航行潜艇所受波浪力计算中有待深入研究的重点问题。     

潜艇操纵性水动力数值计算中湍流模式的比较与运用

湍流模式的选取对潜艇操纵性水动力数值计算精度有着重要影响,采用六种湍流模式计算了SUBOFF主艇体及主艇体加指挥室围壳两种模型在一定漂角范围内的潜艇操纵性水动力,并与试验值进行了比较,结果表明SSTk-ω模型更为适合潜艇操纵性水动力计算。在此基础上对SUBOFF全附体模型在一定漂角和攻角范围内的艇体水动力进行预报计算,并对该计算方法应用于潜艇操纵性水动力预报计算的计算精度与适用范围进行了探讨。     

不同浸深比半浸式螺旋桨动态力试验研究

为了探讨半浸式螺旋桨的动态性能,利用六分力天平测量不同浸深比下半浸式螺旋桨的非定常力,分析浸深比对半浸式螺旋桨动态力的影响,并探讨半浸式螺旋桨受力在水平面和垂直平面上的方向性.试验结果表明,在合适的浸深比下,可以减小半浸式螺旋桨各分力的波动,改善半浸式螺旋桨的操纵性能.     

肥大型船模操纵性水动力CFD预报的试验验证分析

肥大型船操纵性水动力的预报不仅是肥大型船操纵性设计多方案选型及优化的基础,而且是水面船操纵性水动力预报中的难点.文章探讨了CFD在肥大型船操纵性水动力预报方面的应用能力和预报精度,并进行了系列模型的CFD计算与验证分析,结果表明所建立的肥大型船操纵性水动力CFD数值预报方法具有良好的精度和普适性.     

基于模态滤波的板壳类结构空间均方振速估算方法

针对船舶、航空航天等工程领域中板、壳类结构振动噪声评价问题,将广泛应用于控制工程中的模态滤波理论引入到结构振动评估领域,建立了一种估算结构空间均方振速的新方法.该方法的特点是能在激励源信息未知的情况下,以布置在结构表面有限个振动传感器测量得到的振动响应作为主要输入,估算板、壳类结构的空间均方振速,从而评价结构的整体振动状态.依据该方法对一矩形平板结构受点力、线力和面力等3种典型的激励源作用下,通过少量结构振动测点的振动信息,分别对其空间均方振速进行了数值验证;同时利用一水下加肋圆柱壳结构进行了试验验证.数值和模型试验验证结果表明：利用该方法评估得到的振动速度谱线特征与精确解和实测值基本一致,评估误差在2 dB以内,满足工程应用精度要求.该方法可以应用于工程中板、壳类结构振动噪声评价和振动状态的在线监测评估.