截齿卸煤机的设计

为解决北方冬季冻煤卸车问题,设计了一种卸冻煤的截齿卸煤机。介绍了传动部件和螺旋部件的设计。通过对螺旋截齿配置与牵引速度进行合理匹配,设计出一种新型的截齿卸煤机,能大大提高卸车效率。     

启东中远海运海工浮式生产储卸油船N999 FPSO下水

正2021年4月12日,由启东中远海运海工承建的浮式生产储卸油船N999 FPSO项目举行下水仪式。这是中国船企首次为欧洲一流油公司非洲项目建造浮式生产储卸油船。据悉,该项目船长270米,总宽54m,型深为31.5m,设计使用年限为30年,最大排水量约为32万吨,储油量不少于144万桶,日卸油量达110万桶,     

新扬子造船2艘散货船相继出坞

<正>2月10日上午,新扬子造船为Allseas建造的82000载重吨散货船)顺利出坞。该船是新扬子造船为其建造的第二艘下水船舶。同日上午,厂编15号64000载重吨散货船相继从新扬子船坞顺利出坞。该船是新扬子造船为扬子江航运公司建造的64000吨系列散货船。     

湄洲湾秀屿港3.5万吨级码头迎来首艘大吨位外籍轮

5月14日中午12时许,载运5600立方米计2300根原木的利比里亚籍"汤姆·阿拉瓦"号货轮(船长175M、船宽26M,吃水9M,总吨27827吨)从美国阿拉斯加港首航湄洲湾秀屿,平安靠泊3.5万吨级码头,这是该码头投入使用至今迎来的第一艘大吨位外籍轮.该码头主体工程于2000年6月通过验收,质量评定为优良,并投入试生产.码头结构及水深可满足停靠5万吨级散杂船及第三代集装箱船,年吞吐能力110万吨(杂货80万吨、集装箱3万TEU).迄今已安全泊卸内外贸船舶72艘次,货物12.5多万吨、集装箱7850TEU.     

宁波港镇海港区三号泊位技术改造

宁波港镇海港区三号（煤炭）泊位原设计工艺流程安排不合理，机械设施生产能力不配套以及卸煤机械故障多，所以一直形成不了年设计卸煤１００万吨的生产能力。为适应北煤南运的需要，要求泊位年卸煤能力达到２００万吨以上，为此决定对该泊位进行全面的技术改造。原两台１０ｔ带斗门机改为５台１０ｔ特重型门机，增设５台喂料行车，进堆场输送机系统由原单线改为双线。     

武钢工业港提升吞叶能力的三大法宝

今年以来,随着武钢产能的不断扩大,进口矿石需求量不断增加,全年卸船量将超过1100万吨,而武钢工业港现有卸矿码头5座,年设计能力仅520万吨,面对空前压力,工业港月月完成卸船任务,月月刷新纪录,特别是7～9月份创造了连续3个月卸船突破100万吨的奇迹.     

福州港散货(河砂)码头第二条装船作业线工艺方案选择

福州港散货(河砂)码头位于闽江南岸,有1个2万吨级装船泊位和2个500吨级卸驳上砂泊位,由5台装卸设备和1 500 m长皮带机系统构成了2 条卸驳上砂线和1条装船线,年设计装船能力为98万吨 ,而2000年实际装船量达170万吨,设计能力和实际需求存在巨大的差距,增加第二装船作业线迫在眉睫. 　　……     

广州文船公司建成大型卸船机

10月16日,广州文冲船厂有限责任公司为福建漳州后石电厂制造的大型卸船机厂内完工,日前在荷兰“快乐海盗”号2台550吨船吊的配合下,整机成功装船运往漳州。该卸船机重1350吨,整机吊装量达1060吨,轨距为22米,最大作业半径为42米,整机高度50米,连续卸煤速度2200吨／小时,具有先进的自动化控制系统,整机行走、旋转、变幅均采用液压系统控制,可整机单人全天候作业,舱底自动清煤干净等特点,适应于10万吨级以上船舶的卸煤作业。该卸船机是广州文船公司建造的最大卸船机,建造时间短,技术含金量高,吊装难度大。在建造过程中,克服了种种困难,仅用了10个月时间就完成了这台机的制造、安装工作,受到了业主及总承包商的好评。     

热烈庆祝常熟港开港十五周年

港口作业效率有新纪录2008年,常熟港以单舱单吊最高效率每小时1680吨的纸浆下卸速度,刷新了由比利时安特卫普港保持的单舱单吊最高效率每小时1256吨的世界纪录。2009年,常熟港创下了日卸新西兰原木6800万方、日卸钢坯24000吨的最高纪录。2010年,常熟港成功地完成了世界最大自磨机的装船作业。     

CCS船级40万吨VLOC“ORE NINGBO”号顺利交付

<正>2019年3月29日,由中国船级社(CCS)检验的单一船级40万吨矿砂船"ORE NINGBO"号在扬子江船业太仓基地顺利交付,该船是扬子鑫福造船有限公司为工银租赁和招商轮船承建的6艘40万吨矿砂船中的最后一艘。"ORE NINGBO"号总长362米,型宽65米,型深30.4米,结构吃水23米,航速14.5节,续航力2.55万海里。作为第二代40万吨矿砂船,其在结构安全和性能指标等方面进行     

Experimental uncertainty of a physical model of a tanker moored to a terminal in a port

This paper presents the uncertainty modelling of experimental results for a physical model of a tanker moored to a terminal inside a port. The physical model was built for an oil terminal at the port of Leixões in Portugal. The model incorporates the new modified port layout, as well as a future 300 m extension of the port outer north breakwater to enhance operational conditions. The physical model tests were performed on a scale of 1:80 in the Portuguese Civil Engineering Laboratory (LNEC). A generic mooring system of four mooring lines and two fenders is simulated using a nonlinear spring system. Decay tests are carried out to evaluate the natural periods of the moored model. Then, tests are carried out for the moored model in waves. The major aim of the experimental study is to obtain novel results for the wave elevation and direction at various locations inside the port, the ship motions at six degrees of freedom, and loads on mooring lines and fenders including the modified port layout. As the physical model measurements are subjected to different types of uncertainties, a systematic uncertainty analysis is carried out here, following ITTC guidelines and recommendations, to quantify all possible sources of uncertainties. The results are discussed, and several conclusions are reached. Based on the experimental results, the presented physical model study may replicate the results for waves and motions with uncertainties less than 9% of the significant amplitudes. The assessment of the applied nonlinear spring model reveals load predictions on the moorings, with uncertainties less than 4% of the maximum mooring loads.     

电缆燃烧性能的实验与仿真研究

在剖析电缆火灾原因的基础上,利用实验方法对阻燃电缆的阻燃性能进行了研究,得出了其在火焰中具有良好的抗火能力;之后利用破坏性实验进一步证明了阻燃电缆的良好抗火性能;然后利用FDS火灾模拟软件对无电缆参与的火灾和有电缆参与的火灾进行了仿真研究,得出了电缆在火灾中是否被引燃主要取决于是否与火焰直接接触的结论;最后,建议人们在电缆防火设计时,重点关注那些容易接触火焰的电缆。     

船用柴油发电机模拟机的设计

柴油发电机是舰船上重要的电源装置,它的性能直接影响到船上的电力系统性能。本文以某船用12相、8极柴油发电机为原型,详细阐述了其模拟机的设计方法。其模拟机的研制,对船上电力系统动态模拟和研究、船用柴油发电机的设计和研制提供了新的手段。     

一种异步电动机故障诊断系统设计

文章分析了传统故障诊断系统的特点,介绍了一种高分辨率谱估计算法-MUSIC算法,并针对该算法特点,提出了一种基于ARM微处理器的异步电动机嵌入式故障诊断系统,重点阐述了系统硬件电路和软件系统的设计,并进行了实验验证。结果表明系统具有硬件电路简单、可操作性较强、实时性可靠等优点。     

Characteristics of a bubble jet near a vertical wall

A numerical model of a coupled bubble jet and wall was built on the assumption of potential flow and calculated by the boundary integral method. A three-dimensional computing program was then developed. Starting with the basic phenomenon of the interaction between a bubble and a wall, the dynamics of bubbles near rigid walls were studied systematically with the program. Calculated results agreed well with experimental results. The relationship between the Bjerknes effect of a wall and characteristic parameters was then studied and the calculated results of various cases were compared and discussed with the Blake criterion based on the Kelvin-impulse theory. Our analyses show that the angle of the jet＇s direction and the pressure on the rigid wall have a close relationship with collapse force and the bubble＇s characteristic parameters. From this, the application range of Blake criterion can be determined. This paper aims to provide a basis for future research on the dynamics of bubbles near a wall.     

Study of a simple sensor for stress history measurements of a structural member using a piezoelectric element

This paper describes a stress sensor using a piezoelectric element which was developed to monitor features of the stress history of a structural member. The sensor is 90 mm long, 60 mm wide, and 25 mm thick. A stress-level meter can turn on and off different colored light-emitting diodes (LED) according to the changes in a stress level. A stress-level cross counter can display the number of cycles which exceeds a specified stress level during a monitoring period. The sensor is bonded onto a structural member using an adhesive agent. In order to see the performance of the prototype sensor, experiments were carried out using a fatigue-testing machine. The sensor was bonded onto a smooth specimen and multiple repeated stresses were applied to that specimen. There were three main findings. (1) The sensor can operate under a stress range from −150 MPa to 150 MPa, and a frequency from 0.05 Hz to 5 Hz. (2) The stress-level meter can turn the lights of the LED on and off accurately under any stress amplitude and frequency. (3) When the stress frequency is 1 Hz or less, the stress-level cross counter can count accurately the number of cycles which exceed the predetermined stress levels. Received: February 25, 2000 / Accepted: April 11, 2000     

一类运输优化问题求解过程分析

通过对运输决策问题中某种基本情况的研究，建立运力有限情况下单个需求点单一物资运输的研究模型，给出求解模型的算法，通过一个算例进行了验证。与目前文献资料中类似研究模型相比较，在决策中考虑运达概率对运输决策的影响是本文模型的一大突出特点。     

高低型双涡流室双缩口燃烧室的排放特性

为优化某船用柴油机的燃烧室的"油-气-室"匹配,降低有害物排放,运用AVL Fire对原型燃烧室改用不同燃烧室进行额定工况模拟.结果表明,高低型双涡流室双缩口燃烧室能在上涡流室形成"飞轮效应",相对于原型燃烧室,不仅能增加功率,而且能降低Nox和SOOT的排放.对高低型双涡流室双缩口燃烧室设置不同的高低涡流室的半径比r/R和喷油夹角进行计算.结果表明:随着r/R从0.3增加到1.3,Nox和SOOT的排放量均先减少后增多;当r/R为0.7时,Nox和SOOT的排放量均最少.当喷油夹角为140°～165°时,随着喷油夹角的增大,Nox的排放量先减少后增加,随后再减少,最后又升高;SOOT排放量先减小后增大,随后再减小.     

某船用大型可拆卸式滚动轴承设计

文章以船用滚动轴承为研究对象,针对该滚动轴承工作中存在的缺点和不足,设计了一种船用可拆卸式滚动轴承,说明了该滚动轴承的工作原理和主要零部件,并利用三维建模软件UG进行了该滚动轴承的零部件及装配体建模,最后进行了滚动轴承装配体的干涉检查,结果表明,所设计的船用大型可拆卸式滚动轴承运行良好。