基于分布式检测与决策融合的海底油气管线检漏

利用多传感器的信息融合思想,提出分布式检测与决策融合方法进行长距离海底管线泄漏监测。试验水管和天然气／凝析油管线现场数据分析表明此算法不仅降低了误报警概率,且对流体在输送过程中动态变化具有稳健性。     

烟台海域海岛自动站大风对比试验

烟台北部面临黄、渤海,海岛自动站分布众多.我们发现,在同一大风过程中,各海岛自动站的风速、风向因为海拔高度、周围地形影响、下垫面摩擦的不同造成明显差异.本文主要以长岛作为渤海海峡大风的代表站,以崆峒岛和芝罘岛作为烟台北部沿海海域大风的代表站,利用便携自动站的观测数据近似代表海面大风的实况,与代表站进行大风的对比试验,对比试验的数据均采用指数廓线公式订正到海面10m高度.分析了三个海岛自动站的不同风向下的海面大风的实际代表性,并给出不同风向下的大风订正值.     

An Experi mental Study on Wave-Induced Dynamic Stresses in Seabed

1 .IntroductionEvery year ,Taiwanis subjectedtotwo or three typhoonintrusions in average which always causedisasters . Most of the disasters which occur around the coastal zone are due to seabed instability andcoastal structure destruction caused bytyphoo…     

Tensile stiffness analysis on ocean dynamic power umbilical

Tensile stiffness of ocean dynamic power umbilical is an important design parameter for functional implementation and structural safety. A column with radial stiffness which is wound by helical steel wires is constructed to predict the tensile stiffness value of umbilicals in the paper. The relationship between the tension and axial deformation is expressed analytically so the radial contraction of the column is achieved in the relationship by use of a simple finite element method. With an agreement between the theoretical prediction and the tension test results, the method is proved to be simple and efficient for the estimation of tensile stiffness of the ocean dynamic power umbilical.     

大万山波浪能试验场泊位间水动力影响分析

当前我国近海海域属稀缺资源,波浪能试验场建设须通过合理布局各测试泊位,在保证试验场各泊位可同时正常开展测试工作的前提下,尽量减小用海面积。拉近试验泊位距离,是减小用海面积的直接手段,但在此过程中,必须保证在试验场场址海域水动力环境下,泊位接入测试波浪能装置后,其之间的水动力影响在可接受的范围内。以大万山波浪能试验场泊位设计为例,介绍一种有效的泊位间水动力影响分析方法。方法采用自主开发的二维Boussinesq波浪模型,开展水动力影响分析工作,同时引入相对波高比概念,对泊位接入装置后影响距离和影响面积进行了定量的分析。文中研究得出的分析方法,可用于判定泊位布局设计的合理性。     

自升式钻井平台悬臂梁负荷试验方法研究

悬臂梁负荷试验是自升式钻井平台建造完工交付使用之前的关键试验项目之一.以200 ft自升式钻井平台“海洋石油923”为例,针对悬臂梁负荷试验方法做出了探索研究,试验结果表明,此方法行之有效,具有操作简便,安全可靠的优点,为其它类似工程项目的顺利实施提供了宝贵的经验和借鉴.     

海洋重力仪稳定性测试与零点漂移问题

稳定性指标是海洋重力仪最重要的技术特性之一。针对国内对海洋重力仪稳定性测试与评估重视不够、数据处理过程欠规范、技术指标要求欠细化等现实问题,研究探讨了海洋重力仪稳定性测评的技术流程和数据处理方法,重点分析了环境因素和重力固体潮效应对测试结果的影响,提出了重力仪零点趋势性漂移、有色观测噪声与随机误差的分离方法,建立了比较完善的海洋重力仪稳定性评估指标体系,分析论证并进一步明确了重力仪零点漂移非线性变化的限定指标要求,为修订现行海洋重力测量作业标准提供了可靠的理论依据。     

海上试验场潮流能发电装置综合测试与评价方法分析(英文)

开展潮流能装置实海况试验、检测与评价方法研究,对海洋高科技成果的转化、海洋可再生能源开发提供了科学、有效的技术保障。文章通过对潮流能装置的功率输出特性、年发电量、能量转换效率三项核心指标进行分析,提出指标的测试内容和评价方法,为实现潮流能海上试验与测试场建设提供技术依据;并根据对海上风电场的研究,提出了海上试验场潮流能装置的电能质量测试与评估方法;给出潮流能装置安全准入的测试内容,全面评估试验场潮流能装置的运行状态。     

浅基础地基荷载-变形特性的分析研究

在土体主应力方向的旋转过程中,主应力方向与塑性主应变增量方向之间存在着非共轴现象,非共轴现象对应力-应变关系具有显著的影响。通过有限元二次开发,将角点结构非共轴理论应用到有限元程序ABAQUS中;对密砂单剪试验进行数值模拟,研究了非共轴现象及其对应力-应变关系的影响;采用离心模型试验方法,对圆形浅基础作用下饱和密砂地基荷载-变形特性进行试验研究;对离心模型试验进行数值模拟,将试验结果与数值计算结果进行对比,对非共轴模型的计算结果的合理性进行验证。研究结果表明:非共轴现象对浅基础地基荷载-变形特性具有显著的影响;当选取合理的非共轴塑性模量时,非共轴模型的计算结果与离心模型试验结果比较接近。     

Seismic fracture evaluation of diaphragm joints in welded beam-to-box column moment connections

Steel box columns are widely used in steel building structures in Taiwan due to their dual strong axes. To transfer the beam-end moment to the column, diaphragm plates of the same thickness and elevations as the beam flanges are usually welded inside the box column. The electro-slag welding (ESW) process is widely used to connect the diaphragms to the column flanges in Taiwan because of its convenience and efficiency. However, ESW may increase the hardness of the welds and heat-affected zones (HAZs), while reducing the Charpy-V notch strength in the HAZ. This situation can cause premature fracture of the diaphragm-to-column flange welds before a large plastic rotation is developed in the beam-to-box column joints. To quantify the critical eccentricity and the effectiveness of fracture prediction, this study uses fracture prediction models and finite element model (FEM) analysis to correlate the test results. In this study, two beam-to-box column connection subassembly tests are conducted with different loading protocols and ESW chamber shapes. To implement a fracture prediction model, the material parameters are established from circumferential notched tensile tests and FEM analysis. Test results indicate that the fracture instances can be predicted on the basis of the cumulative plastic deformation in the HAZs. Analytical results indicate that fracture instances and locations are sensitive to the relative locations of the ESW joints and beam flange. Tests also confirm that the possible fracture of the diaphragm-to-column flange joints can be mitigated by enlarging the chamber of the ESW joint.