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Well-being analysis of GSU transformer insulation incorporating the impact on power generation using

Alagarsamy KRISHNAVEL, Dusmata Kumar MOHANTA, M. Jaya Bharata REDDY

《能源前沿（英文）》 2013年第7卷第3期页码 288-299 doi: 10.1007/s11708-013-0265-7

摘要： With the prevailing power scenario, every watt-second of electrical energy has its own merit in satisfying the consumer demand. At the state of such a stringent energy demanding era, failure of a power generation equipment compounds the energy constraints which will not only result in a huge loss of generation but also have an impact on capital revenue. The unexpected failure of generator step-up (GSU) transformer is especially a major disturbance in the power system operation and leads to unscheduled outages with power delivery problems. The time lag in bringing back the equipment in service after rectification or replacement may increase the criticality as the process involves mobilization of spares and maintenance professionals. Hot atmosphere existing in the vicinity of thermal power stations running round-the-clock with more than 100% plant load factor (PLF) increases the thermal stress of the electrical insulation which leads to premature failure of windings, bushings, core laminations, etc. The healthy state of the GSU transformer has to be ensured to minimize the loss of power generation. As the predication related to failure of a GSU transformer is associated with some uncertainties, a fuzzy approach is employed in this paper along with actual field data and case studies for the well-being analysis of GSU transformer.

关键词： generator step-up (GSU) transformer well-being analysis dissolved gases in oil analysis (DGA) tan delta (TD) sweep frequency response analysis (SFRA) fuzzy inference system (FIS)

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stimuli, different responses: a pilot study assessing air pollution visibility impacts on emotional well-being

《环境科学与工程前沿（英文）》 2023年第17卷第2期 doi: 10.1007/s11783-023-1620-5

摘要：

● Emotional responses to visibility-reducing haze was assessed in a controlled lab.

关键词： Air pollution Emotional wellbeing Variability Visual exposure Emotional bias

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Being good or being known: International reputation of high-speed railway enterprises

《工程管理前沿（英文）》页码 455-466 doi: 10.1007/s42524-023-0250-8

摘要： With fierce competition in the global high-speed railway (HSR) market, international reputation has become essential for enterprises to venture into overseas markets. However, few studies have been performed on the international reputation of HSR enterprises. This study aims to reveal the formation mechanism of HSR enterprises’ international reputation by developing a theoretical framework. The researchers identified five factors and proposed a hypothetical path model based on a comprehensive literature review. After the pilot study, questionnaires were distributed to practitioners in the international HSR industry for data collection. The path model was validated based on partial least-squares structural equation modeling. Eight of the nine paths are statistically supported. Researchers have structured a theoretical framework for the international reputation of HSR enterprises from two perspectives: Being good and being known. Subsequently, a strategic framework was developed to provide targeted promotion strategies for HSR enterprises. The findings of this study contribute to existing international reputation theories using the theoretical model and provide beneficial guidance for HSR enterprises to improve their international reputation through a strategic framework.

关键词： high-speed railway international reputation being good being known structural equation modeling

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Water pumping analysis and experimental validation of beach well infiltration intake system in a seawater

Huan ZHANG,Shu LIU,Xuejing ZHENG,Gaofeng CHEN

《能源前沿（英文）》 2015年第9卷第3期页码 335-342 doi: 10.1007/s11708-015-0365-7

摘要： Based on energy conservation equation and Darcy’s law, a model of beach well infiltration intake system applied in a seawater source heat pump system was established. The model consists of the seawater seepage and the heat transfer process. A porous medium model in a software named FLUENT was applied to simulate the seepage and the heat transfer process. This model was also validated by field experiment conducted on the seashore in Tianjin, China. The maximum relative error between simulation results and experimental results was 2.1% (less than 5%), which was acceptable in engineering application. The porosity and coefficient of thermal conductivity of the aquifer soil were determined to be 0.49 W/(m·K) and 1.46 W/(m·K), respectively in the simulation. In addition, the influencing factors of pumping water of beach well were also analyzed. The pumping water was found to increase when the distance between the beach well and the impervious boundary becomes longer, when the distance between the beach well and the supplying water source shortens, when the diameter of the beach well enlarges, and the drawdown enlarges.

关键词： water pumping analysis experimental validation infiltration intake system seawater source heat pump

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基于钻头运动诱发套管头振动信号检测的井眼防碰监测方法

何保生,刘刚,王平双,文敏

《中国工程科学》 2011年第13卷第5期页码 74-78

摘要：

针对海上加密调整井的井眼防碰问题，设计了一种井筒防碰地面监测预警系统，并进行了现场应用。系统利用加速度传感器监测通过套管传输到套管头上的钻头振动信号，利用数据采集、信号滤波放大和专门编制的监测软件记录分析传感器采集的振动信号，通过对信号的时域、频域分析，确定信号特征与井间相对距离的关系，识别钻头对风险井套管的趋近或碰撞。应用结果表明，该系统能有效感知通过地层、套管传输到套管头的钻头振动信号，并能识别出钻头对风险邻井的趋近，验证了系统在设计理论和方法上的可行性，为加密调整井的井眼防碰、保证钻井安全提供了一种有效的手段。

关键词：调整井防碰风险井振动信号时域分析频域分析

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靖边气田陕100井区马五1+2储层水平井开发优化

赵金省,高建英,肖曾利

《中国工程科学》 2013年第15卷第10期页码 66-70

摘要：

根据研究区实际的储层特点，对水平井开发的可行性进行了分析。结果表明，陕100井区马五1+2储层地质条件适合水平井开发。在对研究区三维精细地质建模的基础上，采用数值模拟对水平井的井网方式、水平段长度、井排距、开发指标等进行了预测。结果表明，最优的井网形式是水平段平行对称布置，采用同时穿越马五12和马五13的阶梯状水平段的水平井，井距和排距均为2 100 m。预测第10年年末，阶梯状水平井的采出程度为48.78 %，比直井的采出程度高16.6 %，研究结果可以指导研究区水平井的高效开发。

关键词：靖边气田水平井开发指标井网优化

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现代建模与优化技术研究——在三江平原井灌水稻节水灌溉系统中的应用

付强

《中国工程科学》 2002年第4卷第6期页码 44-55

摘要：

将SPAC模型理论变相宏观应用于三江平原井灌水稻节水灌溉系统中，将地下水、农用机井、晒水池、渠道、本田池、环境因子等纳入整体系统，在各个子系统中综合运用现代建模与优化技术，通过有关机理与理论研究，建立相关的数学模型。对地下水、晒水池、渠道及水稻水分生产函数、水稻需水量、有效降雨等6个子系统进行建模与分析，制定了非充分灌溉条件下优化灌溉制度。最后通过典型示范小区的优化设计，将节水技术组装，实现了增温5～15℃，节水171%，增产700～1000 kg/hm²的目标。

关键词：建模优化三江平原井灌水稻节水灌溉系统

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加挂井槽技术的研究与应用

李大全,罗振钦,胡辉,张秀林

《中国工程科学》 2011年第13卷第5期页码 88-92

摘要：

为解决现有海上平台存在的预留井槽不足的问题，研究和开发了加挂井槽技术。面对海上平台的现实难题，通过对平台空间条件、钻井方式、平台结构及平台系统能力等的分析和研究，提出和确定加挂井槽的可行性，细化和完善加挂井槽的相关设计并将设计方案应用于工程实践。实践证明：加挂井槽解决了现有海上平台预留井槽不足的问题，具有结构简易、工程周期短、投资成本低等特点，能满足增打调整井的要求，经济社会效益显著。

关键词：调整井隔水套管加挂井槽结构校核

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工程与人类安全和福祉

Hideaki Koizumi

《工程（英文）》 2015年第1卷第3期页码 282-287 doi: 10.15302/J-ENG-2015066

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Application of granular solid hydrodynamics to a well-graded unbound granular material undergoing triaxial

Shixiong SONG, Qicheng SUN, Feng JIN, Chuhan ZHANG

《结构与土木工程前沿（英文）》 2013年第7卷第1期页码 83-88 doi: 10.1007/s11709-012-0148-8

摘要： Unbound granular materials (UGMs) are widely used as a base or a subbase in pavement construction. They are generally well graded and exhibit a higher peak strength than that of conventional cohesionless granular materials. By using a simplified version of granular solid hydrodynamics (GSH), a set of GSH material constants is determined for a UGM material. The deviatoric stress and volumetric strain caused by triaxial compression are calculated and then compared with experimental data. The results indicate that the GSH theory is able to describe such a special type of granular materials.

关键词： granular solid hydrodynamics unbound granular material (UGM) triaxial tests

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钢筒内衬爆炸水井设计中的几个动力学问题研究

顾文彬,陈学平,刘建青

《中国工程科学》 2013年第15卷第10期页码 71-79

摘要：

以3 kg 2，4，6-三硝基甲苯（TNT）炸药在内径和深度均为11 m的内衬钢筒混凝土围堰爆炸水井中的爆炸为研究对象，数值模拟研究了筒壁厚度、混凝土围堰厚度对钢筒受力与变形的影响，以及水井内设置气泡帷幕对提高设施安全性等爆炸水井设计中关注的几个动力学问题。结果表明：水井内水中爆炸冲击波参数与P. Cole公式计算结果基本吻合；钢筒内壁不利的受力与形变部位都出现在装药中心水平线以下的筒体部位，直到壁厚达到50 mm时距筒底1.60 m处等效塑性应变仍可达到0.001 6，不满足强度理论判断条件；取钢筒厚度为20 mm，外加0.5 m厚混凝土围堰时，内衬钢筒爆炸水井符合安全性强度设计要求；在水井底部设置半径为4.9 m、厚度为0.05 m气泡帷幕时，可使筒壁处的冲击波压力峰值降低40.6 %；对于壁厚为20 mm的钢筒，采用气泡帷幕衰减冲击波措施时，混凝土围堰厚度达到0.35 m就能满足安全性设计要求。上述结论可为内衬钢筒爆炸水井结构设计和安全性评估提供方法及依据。

关键词：内衬钢筒爆炸水井设计动力学分析应力应变响应数值模拟研究气泡帷幕混凝土围堰

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高压高产含硫气井测试技术及应用

王世泽,唐瑞江, 赵祚培,杜林

《中国工程科学》 2010年第12卷第10期页码 56-60

摘要：

川东北海相气藏埋藏深、温度压力高、普遍含硫、平面及纵向产量变化大，测试工艺复杂，面临井下工具受限、井下事故复杂、井控及环境污染风险大等难题。在川东北高含硫气井测试实践与经验基础上，形成了高压高产含硫气井测试技术。形成了三类六套APR射孔—酸压—测试联作短期测试管柱；管柱力学分析、多级压力控制、国产抗硫及复合地面流程等测试配套工艺满足各类测试要求；以压井、防喷、防漏为主的测试应急方案及措施确保了作业安全。该技术在YB1-侧1，YB12，HB1-1D等井中成功应用，为该类气田勘探开发的顺利进行提供了技术支撑。

关键词：高压高产含硫气藏测试

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Synthesis and characterization of well-defined comb-like branched polymers

LI Aixiang, LU Zaijun, LÜ Zijian

《化学科学与工程前沿（英文）》 2008年第2卷第4期页码 407-411 doi: 10.1007/s11705-008-0064-6

摘要： Well-defined comb-like branched polymers having one branch in each repeating unit have been successfully synthesized by the coupling reaction of living polystyrene (PS) and polyisoprene (PI) anions with 1, 1-diphenylethenyl (DPE) groups along PS backbone prepared via atom transfer radical polymerization (ATRP) of 4-vinylbenzyloxy benzophenone (Sc) followed by Wittig reaction. The resulting comb-like branched polymers were characterized by IR, H-NMR, gel permeation chromatography (GPC) and static light scattering (SLS) in detail. The effect of living chains and DPE group molar ratio on grafting efficiency was discussed. The results show the coupling reaction of living chains and DPE groups was highly effective, and the coupling efficiency can be controlled via the feed molar ratios of living chains and DPE groups. Moreover, the effect of molecular weights of backbone (PSe) and PSLi or PILi on grafting efficiency was also discussed. The results show that when excess living polymers were used, the almost quantitative grafting efficiency could be achieved.

关键词： grafting efficiency polyisoprene quantitative grafting effective molecular

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微地震监测技术在大庆油田A区块井网设计中的应用

马继升

《中国工程科学》 2012年第14卷第4期页码 74-76

摘要：

人工裂缝方位与井排方向影响着低渗油藏开发效果，在人工造缝过程中，应用微地震监测压裂层人工裂缝的方位、走向、裂长及缝高，结合地应力方向确定井排方向，为A块取得较好的开发效果奠定了基础。

关键词：微地震监测人工裂缝井网设计

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低渗油藏裸眼水平井压裂技术及应用

潘毓兵

《中国工程科学》 2012年第14卷第4期页码 70-73

摘要：

针对大庆外围朝长地区未动用储量属于低渗透扶余油层，采用常规直井开发，单井产能低、开发效益差，为进一步提高低渗透扶余油层开发效果，通过水平井近平衡钻井、裸眼完井，减少了钻井及固井对储层污染，采用打孔管结合油膨胀封隔器工艺进行压裂改造，探索低产低渗透储层有效的开发途径。试油及投产效果表明，低渗透油藏采用近平衡钻井、裸眼完井能有效地保护储层，实施裸眼水平井储层压裂改造能够提高单井日产油，对进一步改善低渗透油藏开发效果有重要意义。

关键词：低渗透水平井裸眼完井压裂