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Trend prediction technology of condition maintenance for large water injection units
Xiaoli XU, Sanpeng DENG
《机械工程前沿(英文)》 2010年 第5卷 第2期 页码 171-175 doi: 10.1007/s11465-009-0091-0
关键词: water injection units condition-based maintenance trend prediction
Yongtao LI, Christina L. MCCARTY, Ed J. GEORGE
《环境科学与工程前沿(英文)》 2011年 第5卷 第3期 页码 417-425 doi: 10.1007/s11783-011-0310-x
关键词: automated solid-phase extraction programmed-temperature vaporization large-volume injection gas chromatography/mass spectrometry semi-volatile organic compounds water analysis
Pathirikkat GOPAKUMAR,M. JAYA BHARATA REDDY,Dusmata Kumar MOHANTA
《能源前沿(英文)》 2015年 第9卷 第2期 页码 148-161 doi: 10.1007/s11708-015-0344-z
关键词: phasor measurement units (PMUs) pragmatic PMU placement simulated annealing (SA) western region Indian power grid (WRIPG)
张洪亮
《中国工程科学》 2012年 第14卷 第4期 页码 62-64
大庆西部外围地区特低渗透扶余油层具有埋藏深、厚度薄、砂体零散的特点,针对首次注水开发的特低渗透油田注水井吸水能力差、难以有效开发动用的实际,在搞清该区块微观特征的基础上,为确保特低渗透储层达到建立有效驱替,“注够水、注好水”的目的,经过反复理论研究和论证,提出了单井增压注水试验,现场应用后注水井能够完成配注,周围油井明显见到增油效果,实现了特低渗透储层有效驱替。利用无源微地震和同位素监测资料分析,改善了吸水状况,缓解了层间矛盾,储层动用程度得到提高。随注水压力升高降低,注水波及区范围随之升高、降低,增压注
Jingling LIU,Tao YANG,Qiuying CHEN,Feng LIU,Binbin WANG
《环境科学与工程前沿(英文)》 2016年 第10卷 第1期 页码 103-113 doi: 10.1007/s11783-014-0686-5
关键词: Haihe River Basin ecological risk eco-units heavy metals
姜振海
《中国工程科学》 2012年 第14卷 第4期 页码 77-82
针对萨北开发区油层沉积特点及特高含水期剩余油分布特点,以水动力学原理为指导,在已有周期注水实践经验的基础上,结合数值模拟进行机理研究,优化周期注采方式及各项参数,引入了分层段交叉注采改变液流方向改善开发效果的做法,在实践中取得了较好的效果。
Reliability prediction and its validation for nuclear power units in service
Jinyuan SHI,Yong WANG
《能源前沿(英文)》 2016年 第10卷 第4期 页码 479-488 doi: 10.1007/s11708-016-0425-7
关键词: nuclear power units in service reliability reliability prediction equivalent availability factors
Capacity limitation of nuclear units in grid based on analysis of frequency regulation
Yiping DAI, Pan JIANG, Lin GAO, Weimin KAN, Xiaoqing XIAO, Ge JIN
《能源前沿(英文)》 2012年 第6卷 第2期 页码 148-154 doi: 10.1007/s11708-012-0174-1
关键词: nuclear units capacity overspeed primary frequency control (PFC) second frequency control (SFC)
Three-dimensional numerical simulation for plastic injection-compression molding
Yun ZHANG, Wenjie YU, Junjie LIANG, Jianlin LANG, Dequn LI
《机械工程前沿(英文)》 2018年 第13卷 第1期 页码 74-84 doi: 10.1007/s11465-018-0490-1
Compared with conventional injection molding, injection-compression molding can mold optical parts with higher precision and lower flow residual stress. However, the melt flow process in a closed cavity becomes more complex because of the moving cavity boundary during compression and the nonlinear problems caused by non-Newtonian polymer melt. In this study, a 3D simulation method was developed for injection-compression molding. In this method, arbitrary Lagrangian-Eulerian was introduced to model the moving-boundary flow problem in the compression stage. The non-Newtonian characteristics and compressibility of the polymer melt were considered. The melt flow and pressure distribution in the cavity were investigated by using the proposed simulation method and compared with those of injection molding. Results reveal that the fountain flow effect becomes significant when the cavity thickness increases during compression. The back flow also plays an important role in the flow pattern and redistribution of cavity pressure. The discrepancy in pressures at different points along the flow path is complicated rather than monotonically decreased in injection molding.
关键词: injection-compression molding simulation injection molding melt flow cavity pressure
density measurement for plastic injection molding via ultrasonic technology
《机械工程前沿(英文)》 2022年 第17卷 第4期 doi: 10.1007/s11465-022-0714-2
关键词: ultrasonic measurement melt density in-situ measurement injection molding
王学忠
《中国工程科学》 2011年 第13卷 第3期 页码 104-106
为降低稠油热采成本,以燃烧原油生产蒸汽进行热力开采的开发方式需要改变,同时需要减少注入水对油层造成的冷伤害,因此开展了干热岩辅助采油可行性研究。干热岩辅助采油技术是利用干热岩抽取地下热能加热油层,以降低原油粘度、提高原油流动能力。在技术配套方面,无论钻深井,还是稠油热采技术,都是成熟的。干热岩的热能源于核幔边界的地热,分布广泛、清洁、可再生。研究表明,干热岩辅助采油技术针对性较强,是对现有蒸汽吞吐+蒸汽驱热采技术的有效继承,技术上具有可行性,并有可能推动相关技术的发展,符合中国节能减排的基本国策。建议在有利区块率先开展先导试验。
Intelligent methods for the process parameter determination of plastic injection molding
Huang GAO, Yun ZHANG, Xundao ZHOU, Dequn LI
《机械工程前沿(英文)》 2018年 第13卷 第1期 页码 85-95 doi: 10.1007/s11465-018-0491-0
Injection molding is one of the most widely used material processing methods in producing plastic products with complex geometries and high precision. The determination of process parameters is important in obtaining qualified products and maintaining product quality. This article reviews the recent studies and developments of the intelligent methods applied in the process parameter determination of injection molding. These intelligent methods are classified into three categories: Case-based reasoning methods, expert system-based methods, and data fitting and optimization methods. A framework of process parameter determination is proposed after comprehensive discussions. Finally, the conclusions and future research topics are discussed.
关键词: injection molding intelligent methods process parameters optimization
杨志冬,周金燕,常智勇,张金荣,韩铭毅
《中国工程科学》 2012年 第14卷 第4期 页码 31-33
讨论了红032井区注水前缘分布及微地震监测结果。结果表明,微地震注水前缘监测结果与油田地质数值模拟结果、地震波幅分布结果一致。由微地震监测结果可以确定注入水推进位置,为油田注水方案调整、改进注采措施、提高注水效率提供依据。
Homayoun EBRAHIMIAN,Bahman TAHERI,Nasser YOUSEFI
《能源前沿(英文)》 2015年 第9卷 第4期 页码 426-432 doi: 10.1007/s11708-015-0376-4
关键词: practical constraints of units pollution function inlet steam valve up-ramp rate of units improved ABC algorithm
标题 作者 时间 类型 操作
Trend prediction technology of condition maintenance for large water injection units
Xiaoli XU, Sanpeng DENG
期刊论文
Determination of selected semi-volatile organic compounds in water using automated online solid-phaseextraction with large-volume injection/gas chromatography/mass spectrometry
Yongtao LI, Christina L. MCCARTY, Ed J. GEORGE
期刊论文
Pragmatic multi-stage simulated annealing for optimal placement of synchrophasor measurement units in
Pathirikkat GOPAKUMAR,M. JAYA BHARATA REDDY,Dusmata Kumar MOHANTA
期刊论文
Distribution and potential ecological risk of heavy metals in the typical eco-units of Haihe River Basin
Jingling LIU,Tao YANG,Qiuying CHEN,Feng LIU,Binbin WANG
期刊论文
Reliability prediction and its validation for nuclear power units in service
Jinyuan SHI,Yong WANG
期刊论文
Capacity limitation of nuclear units in grid based on analysis of frequency regulation
Yiping DAI, Pan JIANG, Lin GAO, Weimin KAN, Xiaoqing XIAO, Ge JIN
期刊论文
Three-dimensional numerical simulation for plastic injection-compression molding
Yun ZHANG, Wenjie YU, Junjie LIANG, Jianlin LANG, Dequn LI
期刊论文
Intelligent methods for the process parameter determination of plastic injection molding
Huang GAO, Yun ZHANG, Xundao ZHOU, Dequn LI
期刊论文