电解电容器的可靠性筛选及失效分析

阐述了电解电容器的老化筛选试验方案和试验过程，并对筛选失效的电容进行了初步的机理分析，找到了容量超差，漏电流超值及其它失效的基本原因。     

舰船设备老化性能评价指标的数学模型建立

为提高舰船设备老化性能评价的准确性,设计了舰船设备老化性能评价指标的数学模型。首先建立了舰船设备老化性能指标,然后制定相对应标准与按评估指标项取值对舰船设备相关数据采集,最后采用物理模型代替系统可靠性模型的逻辑关系,通过描述性能参数随时间的变化规律,建立基于性能退化模型的机械设备性能参数可靠性模型。实验结果表明,此次研究的舰船设备老化性能评价指标的数学模型在舰船设备老化性能评价准确性较高,并减少了舰船设备老化性能评价时间。     

200米饱和潜水设备的电气系统改造

从法国引进200米饱和潜水设备已经30年了，许多设备业已老化。为继续发挥其作用，我局组织人员攻关，采用现代技术和设备进行改造。本文就电气系统的改造，结合潜水钟照明系统改造实例和测绘的氦氧潜水电话电路图进行了原理分析。     

高桩码头承台结构扩建改造工程

目前，我国港口的突出问题是设备老化．装卸效率低下，不适应国际航运事业的快速发展。因此，必须对港口进行适应性改造。文章重点介绍了高桩码头承台结构扩建改造的5种型式及对天津港码头改造的情况。     

港口码头的老化机理与病害评估

结合江苏沿江港口码头设计、改造工作经验,重点分析了港口码头老化病害的基本特征、形成机理和演变规律,对港口码头老化病害的评估、控制及加固改造工作有一定的参考作用。     

热老化对热塑性聚氨酯水润滑轴承材料的性能影响

为了探究老化对水润滑轴承材料摩擦性能的影响,本文选用典型的水润滑轴承材料热塑性聚氨酯（TPU）作为研究对象,依照GB/T3512-2014热加速老化标准对材料进行老化处理。所有的摩擦磨损试验均在CBZ-1船舶轴系摩擦磨损试验机上进行,综合运用超景深显微镜、接触式表面轮廓仪、电子扫描显微镜等多种表面测试技术手段探讨了磨损过程中热塑性聚氨酯试样表面的磨损特征,探讨了不同老化状态试样的磨损机理。试验结果表明：70 ℃老化120 h热塑性聚氨酯的平均摩擦系数降低了57.5%;90 ℃老化600 h热塑性聚氨酯的平均摩擦系数上升了32%;通过FT-IR和Raman分析,随着老化进行,氢键化氨酯基增多,少量氨酯基的C-N键断裂。复杂的化学变化改善了热塑性聚氨酯的有序结构,增加次晶和结晶度,摩擦系数降低;进一步老化造成大分子在应力集中处断裂,使部分柔性分子链脱离基体,摩擦性能恶化。     

微机新技术在机舱监测系统改造中的应用

船舶机舱的监控设备经多年使用后备件耗尽，技术状态老化，若设备全部更新或到原设备制造厂定制配件都需大量资金，现实中往往难以实现。而利用原设备中的可用资源，在原设备的基础上，用最新技术对其进行改造，则是一种很好的技术更新措施。本学院在对自动化机舱实验室改造过程中，利用PLC、PC以及最新的微机网络、多媒体、数据库技术，将20世纪80年代初期水平的自动化机舱监测系统改造成为具有20世纪90年代末期先进水平的机舱监控设备。     

连江船闸启闭系统的更换

连江船闸大都建于六，七十年代，现机械设备大多已老化，文中论述了在更换其启闭系统安装新设备时应注意的技术问题。     

基于纯电动船的直流选择性保护研究

本文分析了电动船直流电站系统的组成配置，分析了不同短路类型的保护机理与选择性实现原理。对关键保护元件的选择，对与保护计算相关的设备分别进行了建模，并建立系统短路故障分析模型，对各类型短路进行了仿真分析与保护策略验证。     

泛华恒兴推出最新电子元器件老化测试系统

近日,北京泛华恒兴科技有限公司推出了电子元器件老化测试系统,该系统主要用于对探井设备电路板中多种电子元器件的入厂筛选与检验,其中包括对电阻、电容、电感等常用元器件的检测。电子元器件老化测试系统,可在室温至180℃的任意温度点下,对电子元器件进行功能、电气指标的自动化测试,温度     

逆变柜框架的振动时效处理工艺

介绍了振动时效工艺比传统自然时效和热时效工艺所具有的优点,阐述了振动时效实施过程及微观机理,通过工艺实践,证实了运用振动时效工艺消除逆变柜框架残余应力、保持结构尺寸稳定的可行性。     

船用新型高强耐蚀铸造铝合金ZL305A研究

本文介绍研制的新型铸造铝合金ZL305A是一种强度高，时效稳定性好，耐蚀性优良的船用新材料。系统地研究了ZL305A合金的化学成分、力学性能、热处理工艺、时效稳定性和耐腐蚀性能。该合金的研制成功，为船用材料开拓了新的应用领域。     

Welding-induced residual stresses and distortions of butt-welded corroded and intact plates

The welding-induced residual stresses and distortions of butt-welds between non-corroded and corroded steel plates are studied experimentally and numerically, simulating a repair in an aged structure. Butt welds are made between plates with different corrosion levels and intact ones, and temperature distributions and distortions have been measured. Finite element analyses of the butt-welded corroded and non-corroded plates are performed to estimate the welding-induced distortions and residual stresses for different levels of corrosion degradation. The environmental conditions during the welding repair process are also accounted for. Experimentally evaluated mechanical properties of corroded steel plates as a function of the temperature during the welding process are employed in non-linear finite element analyses. The importance of the material properties as a function of the severity of the steel plates' corrosion degradation on the welding-induced distortions and residual stresses is also quantified. This study shows the importance of considering the ageing of steel in the repair process. The developed methodology allows critical operational decisions to be made with greater ease and confidence in analysing the welding-induced distortions and residual stresses when ageing structures are repaired to extend their service life. Furthermore, different welding sequence scenarios may be analysed to identify the most appropriate repair solution in minimising the repair cost.     

CO低温氧化霍加拉特催化剂的研究综述

CO低温氧化霍加拉特催化剂主要由铜锰混合氧化物组成。综述了制备前体、沉淀条件、老化时间、煅烧条件、杂质等对催化剂的影响,探讨了霍加拉特催化剂在价态、形态结构和反应方面低温氧化CO的机理以及引起催化剂失活的原因,展望了未来的发展方向。     

高阻尼铝合金层压复合材料阻尼特性和工程应用研究

本文研究了新型高阻尼铝合金层压复合材料阻尼性能，包括材料在低频、声频下的阻尼、经与应力应变振幅的关系，阻尼的时效稳定性，材料的工程阻尼特性，并介绍了材料在海军装备上的减振、降噪应用试验研究。     

分层吹填法在填海工程中的应用

分层吹填法在国内的填海工程中应用实例极少。以港珠澳大桥人工岛的填海工程为例,重点介绍采用分层吹填法围海造地的施工工艺和技术特点,并对分层吹填、打塑料排水板、堆载预压等不同施工阶段的固结沉降进行数值模拟,从固结时效、技术难度和施工效率等方面探讨分层吹填法的适用性和可行性。     

“自立号”自升式平台延长使用寿命的评估

渤海“自立号”是一座典型的沉垫基础自升式平台,平台寿命已经超过30年,为保证平台未来安全运行,需要对其进行剩余寿命的评估。评估内容包括考虑结构腐蚀的结构强度评估,以及对平台历史和延寿期的疲劳损伤累积评估。本文简要介绍了“自立号”平台延寿的评估过程和内容,供类似工程参考。     

RTG编码器反馈信号干扰问题的新型解决方案

为解决因拖令电缆屏蔽层老化而产生的编码器反馈信号干扰问题,提出并实施一种采用电流信号传输模式的新型解决方案.将编码器原先的电压信号传输模式转换为电流信号传输模式,从而保证在除去屏蔽层作用的前提下,编码器的反馈信号能正常传输.该方案取得良好经济效益.     

Experimental assessment of the ultimate strength of a box girder subjected to severe corrosion

The objective of this paper is to describe the experimental assessment of the ultimate strength of a severely corroded box girder subjected to a uniform bending moment resulting from four-point loading. Three box girders that could simulate the behaviour of midship sections have been deteriorated in corrosive seawater environment to simulate different levels of corrosion degradation of ageing ship structures. During the deterioration process, various parameters have been controlled and the total weight lost was registered. Corroded plate thicknesses have been measured in 212 points and a statistical analysis has been performed. The resulting corrosion wastage has been fitted by a non-linear time variant degradation model. The experimental results of the ultimate strength test of a severely corroded box girder subjected to a four-point loading have been analysed. The load-displacement and moment-curvature relationship is discussed, different failure modes are identified, and the strain gauges readings are analysed.     

Effects of adhesive type on the mechanical properties of adhesive joints between polyurethane top coats and polyurethane-based adhesives after accelerated atmospheric ageing

The performance of a sealed stainless steel bracket system, adhesively bonded with two polyurethane-based adhesives (flexible adhesive, stiff adhesive) onto a marine polyurethane top coat, is investigated. The investigated joint connections on the coatings exhibited a high mechanical stability even after accelerated ageing (salt spray exposure, cyclic temperature variations, high relative humidity). The aged joints retained up to 81% of their tensile strength and up to 92% of their lap-shear strength. The torsional rigidity of the adhesive joint exceeded the required clamping torque of the designed bolt. A cyclical lifetime of >9·10⁶ load cycles was estimated. Effects of cyclic ageing on the creep performance of the adhesive joint were found to be insignificant. Under tensile loads, the joints with stiff adhesive material exhibited a linear-elastic performance without the capability to deform prior to failure. The joints with the flexible adhesive material, in contrast, exhibited a behavior typically for ductile materials featuring a pronounced yield plateau prior to failure. Failure loads were higher, and displacement was notably lower, for the joints with stiff adhesive material. All joint connections met the requirements for a safety factor for the design for marine applications (11.6 for the flexible adhesive; 14.3 for the stiff adhesive). When the flexible adhesive is applied, the cohesive strength of the adhesive material is the limiting design factor. When the stiff adhesive is utilized, the load carrying capacity is higher, and the interface between priming coat and steel substrate is the limiting design area of the joints. The strength utilization of the adhesive materials depended on the particular structure of the entire joint configuration, particularly on the interface between steel substrate and the coating material. A number of assessment factors, namely stress limit factor, coating adhesion factor and safety factor, are introduced and discussed for tensile and shear loads.