潜标系统的可靠性研究

本文运用可靠性工程技术对所研究的潜标系统水下部分进行了分析研究。对有关分机多年的试验结果进行统计,得出了系统可靠度验证值。对如何提高系统可靠性作了分析。     

气象水文海洋仪器可靠性强化试验技术应用研究

海洋仪器可靠性是影响海洋仪器工程化和产业化的关键因素,已成为制约我国海洋仪器发展的一大瓶颈问题。针对海洋仪器可靠性提升的需求,本文综述分析了国内外海洋仪器可靠性研究现状,提出了一套适用于气象与水文海洋仪器的可靠性强化试验方法,以定点CTD(温盐深)、气温和气压等海洋水文气象测量仪为研究对象,设计了热应力步进、快速温变、振动步进以及综合环境应力等可靠性强化试验剖面并开展了相关试验。试验结果显示强化试验激发了海洋仪器故障,通过故障定位分析和设计改进,有效提升了设备可靠性水平。本文研究成果可为同类海洋仪器设备可靠性强化试验的开展提供良好借鉴。     

提高声呐微机系统的可靠性的方法

本文论述了利用冗余(容错)和编码检错技术提高声呐微机系统硬件的可靠性,并对软件的可靠性设计作了一些简述。     

影响海洋平台检测质量因素的模糊综合评判分析

本文通过对海洋平台结构实际检测工作的调查分析，着重研究了检测人员的失误对检测质量影响的主要因素，并运用模糊数学的基本理论，对包括人因素，非人因素。进行了多级模糊综合评判，建立了相应的对检测质量影响的理论模型。为验证所建立的数学模型的正确性和有效性，进行了数值实例计算。计算分析结果表明，本文所建立的理论分析模型是比较科学合理的，能较好地分析人的因素对检测质量的影响，为平台结构的完整性、可靠性以及剩余寿命的评估提供了基础和依据     

基于遗传算法的简易海洋平台的疲劳可靠性优化设计

本文提出了利用损伤力学的非线性疲劳损伤模型，在随机海浪交变荷载作用下，简易海洋平台疲劳可靠性优化设计的遗传算法。计算结果表明了计算模型的可靠性与遗传算法解决结构物疲劳可靠性优化设计的有效性     

EAVE潜器的辅助定位系统

具有声学导航定位系统的无人无缆潜器在水下构件中航行时会遇到声场、磁场干扰的麻烦。本文从分析水声通讯可靠性入手,说明辅助定位系统的必要性;结合所介绍潜器的特点,提出了一种既简单、又经济的辅助定位系统方案。     

试探如何提高海流观测资料的可靠性

本文根据工作实践,对海流观测资料的可靠性和具体观测方法作出分析,并提出问题。对今后改进海流观测方法和提高资料可靠性提供了具体措施和建议,以供同行交流。     

结构模糊可靠性指标的遗传算法

本文基于哈索弗－林德提出的结构可靠性指标β的定义，通过改进的遗传算法，建立了考虑变量服从多种概率发布与相关性及其模糊性的广义随机空间内可靠性指标的计算方法，并且通过结构可靠性指标分析与可靠性优化的实例，验证了算法的可行性与可靠性     

新型海洋资料浮标数据采集控制系统研究与概念设计

本文以海洋资料浮标数据采集控制系统的灵活性，可长级性，可靠性，易用性，低功耗和小体积为目标，提出一种基于与ＩＢＭＰＣ兼容的ＰＣ１０４标准总线和ＶＥＴＡ嵌入式实时多任务操作系统的新型海洋资料浮标数据采集控制系统，并在所采用的软硬件平台上，针对系统模块设计了一个小试验系统。     

卫星遥感与船测黄海和渤海海面温度场的比较

本文通过将1979,1980两年3—5月份由TIROS-N及NOAA-6所获得的黄海和渤海表面温度图与同时期的船测温度图比较,不仅阐明了卫星红外遥感海面温度模式的可靠性,而且论证了船测等温线图的局限性,并提出由卫星-浮标(或船)联合,同时进行了大面积测量浅海地区海面温度场的方法。     

Reliability assessment of mooring lines for floating structures considering statistical parameter uncertainties

This work focuses on the effect of parameter uncertainty on the reliability index and on the predictive reliability of mooring lines for floating structures under loading from extreme sea-states. A first-order analytic formulation is developed which takes into consideration uncertain parameters in the statistical models of the maximum dynamic tension and the breaking resistance of the mooring lines. Expressions are derived for the mean and the variance of the reliability index in terms of the mean values and the covariance matrix of the uncertain parameters, and of the sensitivity of the reliability index to the uncertain parameters. The predictive reliability index is expressed in terms of the mean and the variance of the reliability index. The formulation is applied to case studies of catenary and taut-leg mooring lines of an offshore structure and the relative effects of the sources of statistical uncertainty are assessed. The case studies demonstrated the applicability and capability of the formulation to capture and represent the relative contributions of the different sources of uncertainty on the predictive reliability and predictive failure probability, as well as on the statistics of the uncertain reliability index.     

基于模糊集理论的海塘稳定可靠度研究

针对海塘边坡稳定性分析中因忽略参数空间变化等因素产生的分析结果偏于不安全的倾向,提出了一种计算模糊随机可靠度的简化方法.首次引入"正态模糊数"来描述所选重要参数的计算区间,采用简化Bishop法与"模糊顶点法"相结合的方法计算边坡稳定的安全系数密度函数,然后根据大量边坡实例统计结果的构造函数得到安全系数的戒下型隶属函数,最终计算获得边坡稳定的模糊随机可靠度评价.结果分析表明,传统可靠度分析结果偏于不安全,而利用模糊随机可靠度来评价边坡稳定状况更趋于合理性.     

Reliability-based assessment and design of stone-filled crib seawalls for shoreline protection

In this study, an efficient reliability-based design tool for stone-filled crib seawalls is developed. The first-order reliability method is integrated into spreadsheet to facilitate the reliability analysis for practical application. Using this spreadsheet tool, the effects of several major uncertain factors on the seawall design, including design water level, material property, and wave forces, are explicitly explored. In addition, the impact of progressive scour on the seawall stability is demonstrated through a time-dependent reliability analysis. This developed reliability-based design tool for seawalls is validated through comparing with the Monte Carlo simulation. This seawall design tool is easy to use and can be readily adapted in various aspects in the seawall design for shoreline protection.     

Genetic Algorithms of Structural Fuzzy Reliability Index

In this paper the simple generation algorithms are improved.According to the geometricmeaning of the structural reliability index,a method is proposed to deal with the variables in the standardnormal space.With consideration of variable distribution,the correlation coefficient of the variables andits fuzzy reliability index,the feasibility and the reliability of the algorithms are proved with an example ofstructural reliability analysis and optimization.     

声学应答释放器电路部分可靠性分析

声学应答释放器是一种对可靠性要求很高的海洋环境监测设备,文中对国家海洋技术中心研制的声学应答释放器进行了可靠性分析。首先介绍了声学应答释放器的电路构成及功能;然后依据可靠性建模相关理论完成电路部分可靠性模型建立,依据可靠性模型,预计了设备的固有可靠度;最后有针对性地提出改进措施,用于指导声学应答释放器设计,为释放器技术研究提供计算模型与可借鉴的经验。     

A Method for Analyzing System Reliability of Existing Jacket Platforms

Owing to the ageing of the existing structures worldwide and the lack of codes for the continued safely management of structures during their lifetime, it is very necessary to develop a tool to evaluate their system reliability over a time interval. In this paper, a method is proposed to analyze system reliability of existing jacket platforms. The influences of dint, crack and corrosion are considered. The mechanics characteristics of the existing jacket platforms to extreme loads are analyzed by use of the nonlinear mechanical analysis. The nonlinear interaction of pile-soil-structure is taken into consideration in the analysis. By use of FEM method and Monte Carlo simulation, the system reliability of the existing jacket platforul can be obtained. The method has been illustrated through application to BZ28-1 three jacket platforms which have operated for sixteen years. Advantages of the proposed method for analyzing the system reliability of the existing jacket platform is also highlighted.     

海工结构物桩基础竖向稳定性的可靠度分析

应用可靠度理论对渤海海域中海工结构物桩基础的稳定性进行了可靠度分析,阐述了各个设计指标的变化对分项系数及可靠度指标的影响规律,并进一步对各指标的灵敏度进行比较分析。分析结果表明,在各个设计参数中,厚土层的强度指标和设计荷载是两个相对重要的参数,在渤海海域中应用API标准中规定的荷载抗力系数进行设计是适用的。     

Study of Partial Coefficients for Design of Semicircular Breakwaters

In the present study,the reliability design of semicircular breakwater is based on the verification of the rules defined by standard specifications,where partial coefficients are introduced to ensure safety.The reliability of the semicircular breakwaters has been analyzed by using the Hasofer-Lind method to determine the reliability index of structure that has correlated loads,utilizing the long-term observed wave data at a given place.The relation curve between reliability index and safety factor in the traditional design method,as well as the relationships between reliability index and partial coefficients,have been obtained.This paper proposes values of partial coefficients for the design expression of semicircular breakwaters in the cases of anti-sliding and anti-overturning.     

智能化一传感器的发展趋势及实现

本文根据作者在863－818计划中研制的智能化传感器及接触到的国外智能化传感器，介绍了智能化传感器的组成，对传统传感器的优势及其实现方法，并对提高其可靠性提出了几条措施。