船舶调距桨液压系统单元温度单片机控制方法分析

调距桨液压系统是船舶运行的主要推动力之一,在工作过程中会产生大量的热量,使得液压系统周围设备温度不断升高,损害了调距桨液压系统中各部件的功能、安全性及使用寿命。针对上述问题,提出船舶调距桨液压系统单元温度单片机控制方法。分析单片机控制船舶调距桨液压系统温度的工作原理,读取船舶调距桨液压系统周围的温度值,并利用PID算法进行计算,计算值代入船舶调距桨液压系统单片机温度控制计算方程式中,控制温度持续上升。通过对比仿真实验,结果表明:在单片机运作2 h后,船舶调距桨液压系统温度趋于平缓,温度控制在50℃以下。     

基于单片机的船舶液压系统温度控制技术

船舶液压系统在适当的温度范围内使用对提高船舶液压系统的工作可靠性及元件使用寿命具有重要的意义。提出基于单片机的船舶液压系统温度控制技术。对单片机控制船舶液压系统的温度参数进行自适应计算,并对自适应温度控制参数进行优化,实现基于单片机的船舶液压系统温度精确控制。仿真实验结果表明,所提的基于单片机的船舶液压系统温度控制效果较好,在船舶重载工况下,温度控制能源损耗较低,系统整体输出功率稳定,为船舶液压系统的稳定运行提供理论基础。     

基于PLC的水盐度信号测量与处理系统的设计

根据水中电极的导电性受水盐度和温度影响特点，实验测量获得一组在水盐度和温度变化情况下电极对应的电阻值，同时设计基于单片机的硬件电路和编写相应软件程序，研制出工作可靠的盐度信号测量系统，供船用海水淡化装置和船用锅炉等自动监控设计者参考。     

基于单片机的机舱温度自动控制系统的设计

设计了一台基于单片机控制的机舱温度自动控制系统的原理样机,对系统的温度测量、红外遥控、液晶显示、异步电动机调速控制等主要电路进行了分析和设计。原理样机的实验表明,所设计的装置能依据机舱温度自动调节风量来控制舱室的温度。     

脉冲反射法液位测量系统研究

介绍了脉冲反射法液位测量系统，简要推导了脉冲反射法的测量原理，给出了系统结构及主要部件功能。该系统应用时域脉冲反射测量技术，适用于船舶及其它容器的动、静脉液位等参数的自动测量。     

单片机在船舶主机转速测量中的应用研究

本文研究以单片机为核心,以磁电式转速传感器做探头的转速测量装置.介绍了主机转速测量装置的技术要求、系统组成及转速信号的获取原理.给出了转速信号处理电路及工作原理,有着广泛的应用场合和使用价值.     

基于MSP430的ROV舰艇阴极保护电位测量系统

文章介绍了一种新型的可用于水下机器人(ROV)的舰船水下电位测量系统的设计与实现,文章给出了系统的工作原理、系统结构、电路和软件实现方法。     

HFC6船用无刷发电机励磁系统故障分析

本文分析了HFC6船用无刷同步发电机励磁系统工作原理,结合该励磁系统结构特点介绍了一起较典型的因励磁电流不足导致发电机输出电压降低的故障分析和处理方法,提出了针对该类发电机日常维护管理的要点。     

单片机双机并联冗余控制系统

为保证单片机在连续工作状态中的可靠性,将系统结构分成若干模块配置,进行抗干扰设计,并用两块功能结构相同的CPU模块实现并联冗余控制,提高了工作质量。     

ZK-400S全自动纸币塑封包装机的电控系统

分析了银行清分中心采用塑封包装机的必要性和可行性;根据纸币塑封包装机的需要和安全性的要求,设计了一套能够完成塑包机工作要求的电控系统。系统应用单片机控制,以看门狗电路及多个传感器检测为辅,保障整个装置运行的安全性和可靠性。     

船舶柴油机冷却水温度微机控制系统的设计

将单片机应用于船舶主柴油机冷却水温度自动控制系统中。首先对温度测控系统进行了功能分析,并根据系统所要实现的功能进行了硬件元器件的选择和软件算法的确定,最终得出主机冷却水温度控制系统的整套硬件设计方案。     

基于PIC单片机的半导体制冷设计

根据某嵌入式工控计算机CPU的性能指标及其工作环境设计了基于PIC单片机的半导体温度控制系统,研制了样品并进行了实装测试,结果显示计算机CPU工作安全稳定,半导体制冷系统的温控精度达到±0.5℃,证明了设计方案合理可行。     

基于单片机ATmega8与ADS1244的数据采集

本文介绍一种基于ATmega8与ADS1244的数据采集系统。内容包括单片机ATmega8和ADS1244的特点,并详细阐述了数据采集系统中ATmega8和ADS1244的接口技术,包括硬件和软件技术。     

基于LabVIEW和单片机的串行无线遥控系统设计

文章基于LabVIEW与单片机的串口通讯,进而通过单片机实时控制无线电发射系统,设计了无线遥控系统。介绍了虚拟仪器技术在串口通讯中的应用,提出了具体方案并给出了串口硬件连接图和发射系统原理图,最后使用G语言LabVIEW和C语言分别开发了相应的上位机和下位机程序进行实验。实验结果表明,该系统具有良好的人机界面,而且便于进行维护和功能扩充,具有很强的实用性。     

Apparent phytoplankton bloom due to island mass effect

A continuous monitoring of temperature and chlorophyll-a (Chl-a) concentration from a surface water monitoring system and a towed free fall instrument (MVP) around a small island in the Kuroshio showed low sea surface temperature (SST) and high surface Chl-a concentration (SCC) distribution in the lee of the island that indicates typical “island mass effect” phenomena. When the observed Chl-a profiles (0 to 250 m) were integrated, the total amounts in the lee side data were slightly smaller than those of the upstream side of the island. The difference was statistically significant at the 95% confidence level. The cross section diagram of Chl-a indicated the diffusion of subsurface Chl-a maximum (SCM) from the upstream to the downstream flanks of the island. The diffusivity of SCM and the change of potential energy require the same level of strong turbulent dissipation rate at the flanks of the island. That is consistent with our previous direct measurement in a similar hydrodynamic condition. Therefore, the observed high SCC is due to turbulent diffusion of SCM, and clearly showed that high SCC does not require any new production. Although a high fluorescence field behind an isolated island in a strong flow is often visible from satellite images, the images do not necessarily indicate an enhanced primary production at that moment.     

水下控制模块测试系统的系统设计与实验研究（英文）

As a core part of subsea production systems, subsea control modules(SCMs) are costly, difficult, and expensive to install and inconvenient to use in underwater maintenance. Therefore, performance and function tests must be carried out before launching SCMs. This study developed a testing device and an SCM test by investigating SCMs and their underwater. The testing device includes four parts: a hydraulic station, an SCM test stand, a signal generating device, and an electronic test unit. First, the basic indices of the testing device were determined from the performance and working parameters of the SCM. Second, the design scheme of the testing device for the SCM was tentatively proposed, and each testing device was designed. Finally, a practical measurement of the SCM, in combination with the hydraulic station, SCM test stand, signal generator, electronic unit, and highpressure water tank, was carried out according to the test requirements. The measurement mainly involved equipment inspection before testing and an experimental test for the SCM. The validity and feasibility of the testing device and method were simultaneously verified through an association test.     

离子迁移谱嵌入式控制系统设计及实现

离子迁移谱探测器控制系统需要完成对离子迁移谱信号,压力、温度和湿度等环境参数的实时读取、分析和处理,并实时监控仪器的运行状态.因此,要求该仪器内部的计算机系统响应速度快、可靠性高.嵌入式计算机PC/104的实时性和稳定性满足了控制系统的快速可靠的要求.本文简要描述了PC/104的基本特点,重点阐述了控制系统的硬件结构设计和软件任务模块设计.提出了以SBS SCM/SDXa模块和ADT600数据采集模块构成的控制系统和数据采集系统.     

The changing role of ports in supply-chain management: an empirical analysis

As integrated supply-chain management (SCM) is now at the epicentre of business transformation, firms are breaking down boundaries between internal functions, as well as between the enterprise itself and key partners in the value chain (e.g. customers, distributors, suppliers and carriers). One of the main goals of such new management approach is to get everyone in the supply chain into a common platform of logistics transactions and information systems.

Against such background, the aim of this work is to analyse how and if port operators can face the challenge of higher integration, on the assumption that the higher the integration between the actors the higher the competitiveness of the whole supply chain.

Accordingly, we adopted an SCM approach in the analysis of the port of Le Havre in Renault's supply chain. More specifically, we referred to the Lambert tri-dimensional model based on supply chain's structure (actors), key business processes and links between actors. The field work—which mainly consisted of semi-structured interviews to Renault, logistics and port operators, and, finally, to the Le Havre Port Authority—was crucial to gather the needed information.     

The changing role of ports in supply-chain management: an empirical analysis

As integrated supply-chain management (SCM) is now at the epicentre of business transformation, firms are breaking down boundaries between internal functions, as well as between the enterprise itself and key partners in the value chain (e.g. customers, distributors, suppliers and carriers). One of the main goals of such new management approach is to get everyone in the supply chain into a common platform of logistics transactions and information systems.

Against such background, the aim of this work is to analyse how and if port operators can face the challenge of higher integration, on the assumption that the higher the integration between the actors the higher the competitiveness of the whole supply chain.

Accordingly, we adopted an SCM approach in the analysis of the port of Le Havre in Renault's supply chain. More specifically, we referred to the Lambert tri-dimensional model based on supply chain's structure (actors), key business processes and links between actors. The field work—which mainly consisted of semi-structured interviews to Renault, logistics and port operators, and, finally, to the Le Havre Port Authority—was crucial to gather the needed information.     

现代造船托盘管理引入供应链理念的探讨

本文阐述了供应链管理的内涵和基本内容,并用供应链理念对托盘管理进行诠释,进而分析了托盘管理与供应链管理的耦合关系,最后将供应链理念引入托盘管理,这将对我国造船理念和模式的更新给出有益的借鉴.