风冷热泵冷热水机组压缩机故障分析

从风冷热泵冷热水机组与压缩机两个方面分析了压缩机在夏季制冷和冬季制热时发生故障的原因，提出了相应的解决方法。     

某船冰机滑油异常减少的处理及分析

通过实例分析船舶制冷压缩机冷冻机油异常减少的原因,具体介绍油分离器的电磁阀控制排油方式及半封闭式制冷压缩机喷液冷却模式的工作原理,并针对该类型制冷装置故障特点提出相应的预防措施。     

某轮中央空调压缩机电机烧毁事故分析

某99年日本造简易船的中央空调,型号DAKIN US20GE,采用封闭式压缩机,四流程壳管式冷凝器,储液罐紧靠冷凝器下方。某日开往新加坡途中,停空调压缩机清洗蒸发器后再启动时电机跳闸;复位后重新启动,压缩机没有反应,风机正常;测量发现,三相绕组有两相对地绝缘接近零,相间绝缘电阻等于零,表明电机线圈绝缘损坏。船上无备用压缩机,向公司紧急申请。公司在新加坡购得一台翻新压缩机。换新压缩机能暂时恢复空调工作,但不能消除事故原因。借加燃油机会将压缩机送上船,指导船员更换     

制冷压缩机的起动故障及其判断

本文介绍了制冷压缩机在起动过程中容易出现的问题，分析了其原因，提出如何判断这些问题的建议，有助于轮机管理人员找出制冷压缩机起动故障的正确判断方法。     

制冷压缩机长时间运转不停的原因分析

制冷压缩机运转时间过长是船用制冷系统的常见故障之一,对压缩机的工作性能影响很大,其故障原因较为复杂。此文介绍如何根据故障现象及有关简单地操作实现对故障的诊断,为实现计算机故障诊断建立程序框图。     

YORK-CMO28型船舶空调系统的液击和使用管理建议

分析YORK—CMO28型船舶空调系统空调压缩机“液击”的原因，介绍该型空调系统制冷温度控制的基本原理以及对过热度的控制和防止压缩机“液击”的保护，提出日常使用管理的意见和建议。     

船舶制冷设备管理心得

船上制冷压缩机故障和机损较多的主要原因,我以为是对系统的认识不足。     

压缩机组故障诊断专家系统设计

压缩机组是舰船和潜艇装备中一个关键设备.在故障诊断技术发展初期,由于思想认识和经济上的原因,通常仅对压缩机组进行监测和诊断.文章从信号的获取、知识库的建立、推理机设计和解释器设计四个方面阐述了针对某舰船压缩机组故障诊断系统(FDS系统--Fault Diagnosis System)的设计方法.该诊断系统以模糊诊断原理为依据建立知识库和推理机,用PROLOG语言编程.     

博客BOCK创新——BCM2000压缩机管理系统

活塞往复式压缩机是世界上制冷系统里应用最广泛的压缩机。原因很简单：制冷量范围广,众所认可的成熟技术,维护维修方便(对可维修机型),COP值高,等等。为了进一步提高压缩机制造技术,使它有更高的可靠性和效率,对每一个细节问题进行深入了解是很重要的。     

海洋平台压缩机管系气流脉动分析

在开发海上天然气资源过程中,压缩机管道振动会造成管道结构疲劳破坏、计测仪表失真或损坏等严重的危害,而气流脉动是导致往复式压缩机管系振动的根本原因。对气流脉动产生的原因进行简要分析,并根据转移矩阵法,在得到各管系单元的转移矩阵的基础上,采用MATLAB编程设计压缩机管系气柱固有频率的预报系统,对一段复杂管系的气柱固有频率进行计算,将其与试验值相对比,验证该预报系统的可靠性。采用Bentley PULS XM软件对某海洋平台的部分压缩机管道系统进行压力脉动计算,并将计算结果与规范要求相比较,对其管道系统的不合理的部分进行优化。     

集装箱船的大型化开发及其引发的问题

首先概要介绍近年来世界集装箱船大型化的发展，接着分析指出，远洋运输成本低廉是集装箱船大型化发展的驱动力，然后提出大型化发展中出现的3个问题值得讨论。第一个问题是大型化发展受港口航道水深、码头装卸机械等条件制约。第二个问题是设计制造超大型集装箱船的主机不易。最后一个问题是，为解决超大型集装箱船的巨量货物的“集疏运”，必须开发电子信息技术。作者最后提出，21世纪初对大型集装箱船的箱量定位应为8000标准箱。     

An analysis of efficiency of the bulk shipping markets

This article discusses the market efficiency of bulk shipping fleets in both the short and long term perspectives. In the short term it demonstrates that shipowners are profit maximizers and that freight rates are equal to marginal cost, that evidencing allocative efficiency of resources. It assumes that the market is differentiated but the intra-marginal substitution takes place. While it is shown that the marginal cost functions of individual vessels, which are aggregated to provide the market supply schedule, are only unique for a specific voyage, provided the general pattern of trade remains more or less constant the supply function is likely to be relatively insensitive to individual changes in ships' MCs. In the long term it is argued that the market is far less efficient with many factors combining to prevent accurate matching of supply and demand for any but for a very short period of time. In recent years supply has exceeded demand by a considerable amount and it is concluded that finance for ships should be provided primarily from shipowners' accumulated reserves and that loan capital should finance a much smaller proportion of the costs of independent tonnage.     

基于知识工程的船体结构快速设计

在确保安全的前提下,快速设计出优秀船体结构并实现快速修改是船舶设计师梦寐以求的目标。针对这一目标,提出了基于知识工程的船体结构快速设计方法,引入船体结构知识本体的概念,将知识工程原理和参数化技术相结合,对船体结构设计知识库的建立进行了研究,实现了船体结构三维快速设计。设计中设计船的结构构件位置通过位置参数确定,构件尺寸通过母型知识库并运用函数插值再结合规范要求获得。实例表明,该方法将设计知识嵌入到船体结构知识本体中,既有助于设计知识的保留和再利用,又能实现对设计结果的自动检查,进而快速获得合理的船体结构。     

The mispricing of transportation initial public offerings in the Chinese mainland and Hong Kong

The main objective of this study is to determine the level of mispricing of transportation IPOs in the Chinese mainland and Hong Kong. A subsidiary objective is to test the hypothesis that there is a strong positive correlation between the initial day returns that are required for new equity issues and the level of ex ante uncertainty associated with the IPO. By applying a standard methodology in finance for assessing the existence and scale of mispricing, the study finds significant underpricing for transportation IPOs in the Chinese mainland and Hong Kong. There is also evidence that freight-related IPOs are subject to more severe underpricing than non-freight related IPOs, and that water-transport IPOs are underpriced more than IPOs of other types of transport business. It is concluded that there does exist support for the hypothesis that the level of ex ante uncertainty is strongly associated with the level of mispricing and that this explains cross-sectional differences in the degree of underpricing of IPOs. In this respect, the results from the Chinese mainland and Hong Kong are consistent with the results of similar studies conducted elsewhere.     

A study of the changes in performance of quayside container cranes

The learning effect, whereby performance improves with experience, is well documented for manufacturing situations. This article applies these learning concepts to quayside container cranes, in order to determine the relationship between number of containers moved and unloading time. The results show that crane performance has improved with time, and that the learning effect is essentially the same for four ports. Container vessel operators are looking for consistency in port operations. An analysis of variability for one port shows that this consistency is not always achieved and that crane performance does not appear to be related to vessel size.     

船舶溢油事故污染的行政治理

在早期的船舶溢油事故污染研究中,对纯技术的研究远远优先于行政组织管理方面的研究。为此,围绕船舶溢油事故污染行政治理,通过实证分析和规范分析,对行政治理的基本内涵、职能、组织架构和应急计划制定等进行了探讨。研究表明:世界各国虽然对船舶溢油事故污染行政治理予以了高度重视,但基本停留在应用实践层面,因此有必要结合实践,从理论角度予以规范化描述。同样,我国船舶溢油事故污染行政治理尚处于初始启动阶段,有必要加快规范化和合理化的进程。     

Designing optimal routes in a liner shipping problem

A real liner shipping problem of deciding optimal weekly routes for a given fleet of ships is considered and a solution method for solving the problem is proposed. First, all feasible routes for each ship are generated together with the cost and the duration for each route. The routes are given as input to an integer programming (IP) problem. By solving the IP problem, routes for each ship are selected such that total transportation costs are minimized and the demand at each port is satisfied. The total duration for the routes that are selected for a given ship must not exceed one week.

The real liner shipping problem is solved together with four randomly generated test problems. The computational results show that proposed solution method is suitable for designing optimal routes in several liner shipping problems.     

基于均值-CVaR 的供应链协调保险契约机制

在条件风险估值风险度量准则下,以权衡期望利润和CVaR利润（均值-CVaR ）,建立具有风险规避特性零售商的决策目标函数,分析了零售商的最优决策行为。研究结果表明普通的批发价格契约下,零售商的最优订货量小于整个供应链的最优订货量,无法实现供应链的协调,且最优订货量与零售商、供应商和整个供应链的期望利润都随着风险规避程度和权重系数的增大而呈现不减趋势。此外还分析了传统的保险契约也无法实现供应链的协调,需对契约参数进行调整,并给出了保险契约参数与权重系数满足的条件。数值分析结果表明了调整后的保险契约可以实现供应链的完美协调。     

基于知识的船体结构快速设计及优化

在确保安全的前提下,快速设计出优秀船体结构并实现快速修改是船舶设计师梦寐以求的目标。文章针对这一目标,提出了基于知识的船体结构快速设计方法,引入船体结构知识本体的概念,将知识工程原理和参数化技术相结合,对船体结构设计知识库的建立进行了研究,实现了船体结构三维快速优化设计。设计中设计船的结构构件位置通过位置参数确定,构件尺寸通过母型知识库并运用NURBS函数插值再结合规范要求获得,对主要结构采用量子行为遗传算法进行优化。实例表明,该方法将设计知识嵌入到船体结构知识本体中,既有助于设计知识的保留和再利用,又能实现对设计结果的自动检查,进而快速获得合理的船体结构。     

指挥控制系统可靠性设计与评估方法研究

根据指挥控制系统的组成,合理建立系统的可靠性模型,进行系统的可靠性设计与评估,对提高系统的可靠性和作战效能具有十分重要的意义。文章论述了指挥控制系统的可靠性内容,分析了指挥控制系统常用的可靠性模型及可靠度评估方法,并结合具体实例对评估方法进行了验证,为系统的可靠性设计提供了依据。