单桨单舵船舵设计与操纵性试验

以1500t海监船为例，对单桨单舵船的舵型、舵面积等参数的选取，桨、舵的相对位置与双桨双舵高速船的区别进行了研究及比较，同时对该船型的偏航原因进行分析及对纠正偏航提出改进措施。     

Phase change analysis of an underwater glider propelled by the ocean's thermal energy

The phase change characteristic of the power source of an underwater glider propelled by the ocean's thermal energy is the key factor in glider attitude control. A numerical model has been established based on the enthalpy method to analyze the phase change heat transfer process under convective boundary conditions. Phase change is not an isothermal process,but one that occurs at a range of temperature. The total melting time of the material is very sensitive to the surrounding temperature. When the temperature of the surroundings decreases 8 degrees,the total melting time increases 1.8 times. But variations in surrounding temperature have little effect on the initial temperature of phase change,and the slope of the temperature time history curve remains the same. However,the temperature at which phase change is completed decreases significantly. Our research shows that the phase change process is also affected by container size,boundary conditions,and the power source's cross sectional area. Materials stored in 3 cylindrical containers with a diameter of 38mm needed the shortest phase change time. Our conclusions should be helpful in effective design of underwater glider power systems.     

里海远洋渔船无人机舱系统研究

针对我国远洋渔船装备落后、操纵性差、机舱环境恶劣、电站管理水平低、劳动强度大以及渔船机舱自动化水平低等问题,介绍里海远洋渔船无人机舱系统的设计与组成。通过采用主机遥控系统、电站功率管理系统、机舱监测报警系统以及网络通信等技术,将自动化、电气化、信息化和智能化控制技术等船舶前沿科技应用于实船,构建一个满足法国船级社(BV)机舱自动化最高等级AUT-UMS要求的无人机舱系统,以提高远洋渔船的操控性、安全性和可靠性,提升供电系统自动化管理水平,改善作业人员工作环境。对该自动化系统的效果和特点进行分析,结果可为我国远洋渔船自动化系统的研究提供策略和思路。     

全海深双球连接耐压舱的结构设计探索

钛合金耐压球壳被广泛地应用于大深度载人潜水器.但是,由于受到材料强度的限制,若采用成熟的Ti-6Al-4VELI来设计3人型的全海深载人舱,其壁厚将超出很多国家的现有制造能力.为了解决这一矛盾,该文提出了一种新的双球连接的方案,并以中国船级社最新的强度标准作为优化约束条件,用有限元分析法对这种结构形式进行了优化设计.最后,对双球结构方案与传统单球方案作了比较.     

城市轨道交通ATS系统外部接口日志分析

青岛地铁11号线采用的是国内自主研发的自动列车监控系统(ATS),ATS系统作为一个综合信息监控系统的实现平台,以通信前置机作为通信枢纽,与时钟系统、乘客信息系统、广播系统、综合监控系统、无线系统等实现接口.现结合现场实际运行数据,采用UltraEdit文本编辑工具对通信前置机的日志进行检索、分析,通过系统后台的日志分...     

复杂系泊系统静力特性快速计算方法研究

以一工作水深为375 m的转塔式浮式生产存储系统(FPSO)为例,研究了复杂系泊系统静力特性计算方法.基本思路是,首先计算出每种类型锚泊线的水平张力TH-水平跨距X曲线,以离散点的形式给出;然后依次给出上端系缆点水平移动距离,相应的计算每根锚泊线新的水平跨距,再根据这些新的水平跨距在对应的TH-X曲线中插值求出此时的每根锚泊线水平张力,将其向X轴正方向投影,合成后即得上端系缆点移动后的系泊系统X方向水平恢复力.对垂直方向的恢复力计算方法与此类似.计算结果与Dynfloat软件结果吻合得很好.此方法简单直观,容易理解,且耗时较少,比较适用于复杂系泊系统静力特性计算.     

前板桩后低桩承台结构在板桩码头改造中的应用

结合实际工程介绍了前板桩后低桩承台结构的应用特点,分析了在实际设计中的技术要点和注意事项。前板桩后低桩承台结构复杂,原有规范不完全适用。结合实际工程,考虑钢板桩变位不能完全复位、低桩承台卸荷等因素,进行三维数值模拟,得到了码头结构主要构件的内力,从桩基与承台连接方式等方面分析这些因素对结构的影响,从而为结构设计和优化提供了依据。     

基于非线性理论的海上平台空调机组振动预测与减振研究

基于非线性振动理论,建立振动预报方法.通过对空调机组振动的测试与分析,找出了该机组振动的主要激励源和有关影响因素.进而提出了具有针对性的改进措施和增加隔振器的方法,消除结构之间的半刚性连接,改变了海洋平台整体结构的固有频率,使之远离共振区域,取得了明显的减振效果.并通过现场勘探测量和计算,验证了振动分析方法.     

卫星高度计应用研究现状分析

文章介绍了卫星高度计的历史沿革,应用领域及发展概况。     

The structure of dissipation in the western Irish Sea front

We report on an intensive campaign in the summer of 2006 to observe turbulent energy dissipation in the vicinity of a tidal mixing front which separates well mixed and seasonally stratified regimes in the western Irish Sea. The rate of turbulent dissipation ε was observed on a section across the front by a combination of vertical profiles with the FLY dissipation profiler and horizontal profiles by shear sensors mounted on an AUV (Autosub). Mean flow conditions and stratification were obtained from a bed mounted ADCP and a vertical chain of thermistors on a mooring. During an Autosub mission of 60 h, the vehicle, moving at a speed of ~ 1.2 m s^− 1, completed 10 useable frontal crossings between end points which were allowed to move with the mean flow. The results were combined with parallel measurements of the vertical profile of ε which were made using FLY for periods of up to 13 h at positions along the Autosub track. The two data sets, which show a satisfactory degree of consistency, were combined to elucidate the space–time variation of dissipation in the frontal zone. Using harmonic analysis, the spatial structure of dissipation was separated from the strong time dependent signal at the M₄ tidal frequency to yield a picture of the cross-frontal distribution of energy dissipation. A complementary picture of the frontal velocity field was obtained from a moored ADCP and estimates of the mean velocity derived from the thermal wind using the observed density distribution. which indicated the presence of a strong (0.2 m s^− 1) jet-like flow in the high gradient region of the front. Under neap tidal conditions, mean dissipation varied across the section by 3 orders of magnitude exceeding 10^− 2 W m^− 3 near the seabed in the mixed regime and decreasing to 10^− 5 W m^− 3. in the strongly stratified interior regime. The spatial pattern of dissipation is consistent in general form with the predictions of models of tidal mixing and does not reflect any strong influence by the frontal jet.