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Review of fluid and control technology of hydraulic wind turbines

Maolin CAI, Yixuan WANG, Zongxia JIAO, Yan SHI

《机械工程前沿(英文)》 2017年 第12卷 第3期   页码 312-320 doi: 10.1007/s11465-017-0433-2

摘要:

This study examines the development of the fluid and control technology of hydraulic wind turbines. The current state of hydraulic wind turbines as a new technology is described, and its basic fluid model and typical control method are expounded by comparing various study results. Finally, the advantages of hydraulic wind turbines are enumerated. Hydraulic wind turbines are expected to become the main development direction of wind turbines.

关键词: wind turbine     hydraulic system     fluid model     control technology    

An adaptive sliding mode control technology for weld seam tracking

Jie LIU,Youmin HU,Bo WU,Kaibo ZHOU,Mingfeng GE

《机械工程前沿(英文)》 2015年 第10卷 第1期   页码 95-101 doi: 10.1007/s11465-015-0332-3

摘要:

A novel adaptive sliding mode control algorithm is derived to deal with seam tracking control problem of welding robotic manipulator, during the process of large-scale structure component welding. The proposed algorithm does not require the precise dynamic model, and is more practical. Its robustness is verified by the Lyapunov stability theory. The analytical results show that the proposed algorithm enables better high-precision tracking performance with chattering-free than traditional sliding mode control algorithm under various disturbances.

关键词: weld seam tracking     welding robotic manipulator     adaptive control     sliding mode control    

Bridging science, technology and policy in emerging contaminants control

《环境科学与工程前沿(英文)》 2023年 第17卷 第5期 doi: 10.1007/s11783-023-1665-5

Noise control technology for generator sets in enclosures

ZHANG Nailong, YANG Wentong, FEI Renyuan

《机械工程前沿(英文)》 2008年 第3卷 第4期   页码 377-384 doi: 10.1007/s11465-008-0051-0

摘要: Currently, noise pollution is an environmental problem all over the world. The health and life of human beings are affected by loud noise from high power generator sets. To reduce such noise, a sound-attenuated enclosure is widely used for its high performance and convenient usage. By installing equipment in an enclosure, noise is controlled and prevented from radiating. In this paper, noise control techniques for enclosures are presented. Enclosure development trends are predicted.

关键词: equipment     generator     sound-attenuated enclosure     convenient     Enclosure development    

The development of pollution control technology in coal combustion in China

XU Xuchang, ZHANG Hu, ZHUO Yuqun, TONG Huiling, WANG Shujuan, LI Yan

《能源前沿(英文)》 2007年 第1卷 第1期   页码 9-15 doi: 10.1007/s11708-007-0002-1

摘要: The recent development of coal combustion pollution control technologies in China, including desulphurization, denitrification, particulate matters and heavy metals emission control technologies, have been reviewed. The development histories and the advantages of China s self-developed technologies have been introduced in detail. The key points of future research and development in coal combustion pollution control, e.g., combined emission control and CO emission control technologies, have also been discussed.

关键词: development     CO emission     desulphurization     future research     emission    

System engineering for water pollution control at the watershed level in China

Wei MENG,

《环境科学与工程前沿(英文)》 2009年 第3卷 第4期   页码 443-452 doi: 10.1007/s11783-009-0037-0

摘要: The present water pollution situation at watershed level in China has been systematically analyzed. The causes of water pollution are attributed to the extensive economic developmental pattern, poor wastewater treatment, and a lack of nonpoint pollution control. The problems of water pollution control at watershed level include a lack of thought and approach, developmental delay in the environmental standard system, an inadequate monitoring ability, and an inefficient implementation of laws and regulations. From 2006 to 2020, water pollution control and governance will be a national key specific project of science and technology in China. The strategies of this project include establishing a water pollution control system at watershed level, orienting a healthy aquatic ecosystem, conducting risk management, and using comprehensive methods. The goal is to establish and complete a technological system of pollution control and management in three five-year phases. The main tasks are to develop common technologies, management systems, and mechanisms for lake eutrophication control, river pollution control, urban water environmental pollution control, potable water safety, and water environmental management. The bottlenecks of water pollution control and management in China could be systematically removed, and the demonstration of the system engineering approach will be conducted at selected key watersheds.

关键词: water pollution control     watershed     system engineering     sustainability     integrated watershed management     key specific project of science and technology    

Operation and control of flow manufacturing based on constraints management for high-mix/low-volume production

GUAN Zailin, PENG Yunfang, MA Li, ZHANG Chaoyong, LI Peigen

《机械工程前沿(英文)》 2008年 第3卷 第4期   页码 454-461 doi: 10.1007/s11465-008-0083-5

摘要: The existing technology of flow manufacturing, which is mainly appropriate for high volume and repetitive production, is proven difficult to be applied in high-mix/low-volume environments. To adapt lean production into the latter, a new type of flow manufacturing is proposed based on flow path management technology. This paper first describes the general operation framework of the proposed new mode. The main idea is the dynamic formation of adaptable virtual production lines (called flow paths) corresponding to different product families. The application of different theories of constraints/drum-buffer-rope (TOC/DBR) control policies depends on the differences in scope of variety and scale of demand for these product families. The overall architecture of the proposed mechanism of constraint management-based operation and control is introduced. For the implementation, a mathematical programming method is suggested for the dynamic planning of flow paths, and a TOC/DBR ‘path-specific’ mechanism with group scheduling is used for the control over each flow path. We also study other critical issues including the identification and management of resource bottlenecks, and the setting of the buffer size in the deployment of the TOC/DBR mechanism.

关键词: appropriate     management technology     scheduling     technology     different    

Precision forging technology for aluminum alloy

Lei DENG, Xinyun WANG, Junsong JIN, Juchen XIA

《机械工程前沿(英文)》 2018年 第13卷 第1期   页码 25-36 doi: 10.1007/s11465-018-0477-y

摘要:

Aluminum alloy is a preferred metal material for lightweight part manufacturing in aerospace, automobile, and weapon industries due to its good physical properties, such as low density, high specific strength, and good corrosion resistance. However, during forging processes, underfilling, folding, broken streamline, crack, coarse grain, and other macro- or microdefects are easily generated because of the deformation characteristics of aluminum alloys, including narrow forgeable temperature region, fast heat dissipation to dies, strong adhesion, high strain rate sensitivity, and large flow resistance. Thus, it is seriously restricted for the forged part to obtain precision shape and enhanced property. In this paper, progresses in precision forging technologies of aluminum alloy parts were reviewed. Several advanced precision forging technologies have been developed, including closed die forging, isothermal die forging, local loading forging, metal flow forging with relief cavity, auxiliary force or vibration loading, casting-forging hybrid forming, and stamping-forging hybrid forming. High-precision aluminum alloy parts can be realized by controlling the forging processes and parameters or combining precision forging technologies with other forming technologies. The development of these technologies is beneficial to promote the application of aluminum alloys in manufacturing of lightweight parts.

关键词: precision forging     aluminum alloy     closed die forging     flow control forging     hybrid-forming technology    

无人驾驶技术发展对策研究

杨艳明,高增桂,张子龙,沈悦,王林军

《中国工程科学》 2018年 第20卷 第6期   页码 101-104 doi: 10.15302/J-SSCAE-2018.06.016

摘要:

无人驾驶技术被认为是运载工程领域极具颠覆性的一项技术。本文通过专家访谈、对比分析和文献研究等方法,对无人驾驶技术的发展态势、发展阶段进行了分析,并从潜在价值和社会影响进行了评估;提出通过加强汽车线控技术、能源动力技术和驾驶认知技术研究推动无人驾驶技术发展的具体对策。

关键词: 颠覆性技术     无人驾驶技术     汽车线控技术     能源动力技术     驾驶认知技术    

电解锰行业污染防治最佳可行技术评估及污染减排潜力

李旭华,方刚,党春阁,于秀玲

《中国工程科学》 2013年 第15卷 第3期   页码 56-61

摘要:

电解锰行业废水排放量大,污染物浓度高,属于高污染行业,是我国实现污染物控制减排的主要威胁之一。通过对电解锰行业污染防治现状进行分析,构建了污染防治技术评估指标体系,利用层次分析法确定各评价指标的权重,利用综合评价值法对电解锰行业污染防治技术进行了评估。在此基础上,利用自底向上模型对评估出的最佳可行技术的污染减排潜力进行预测。结果表明,与基准年2010年相比,2015年电解锰行业废水排放总量可削减270多万吨,氨氮减排6.6×104 t,减排回收的锰和重铬酸钾可分别达到1.9×105 t和3.747×107 t,锰渣减排4×106 t;同时也表明清洁生产技术减排的能力高于末端治理技术减排,清洁生产技术具有较大的推广普及潜力。

关键词: 电解锰     污染防治     最佳可行技术     减排     潜力    

Permitted emissions of major air pollutants from coal-fired power plants in China based on best available controltechnology

Xiaohui Song, Chunlai Jiang, Yu Lei, Yuezhi Zhong, Yanchao Wang

《环境科学与工程前沿(英文)》 2018年 第12卷 第5期 doi: 10.1007/s11783-018-1065-4

摘要:

We proposed the SO2 and NOx emission performance standards for coal-fired power plants based on the best available control technology.

The CFPGUs’ SO2 emission performance reference values should be 0.34 g/kWh for active units in general areas and 0.13 g/kWh for newly built units and active units in key areas.

The CFPGUs’ NOx emission performance standard reference values should be 0.35 g/kWh for active units in general areas and 0.175 g/kWh for new units and active units in key areas.

关键词: Coal-fired power-generating units (CFPGU)     Emission performance     Best available control technology    

中长期煤利用中大气污染控制技术路线

郝吉明,王金南,王志轩,高翔,高晋生,李凡,姜培学,许嘉钰

《中国工程科学》 2015年 第17卷 第9期   页码 42-48

摘要:

能源利用与大气污染密切相关,我国以煤为主的能源结构决定了煤炭使用过程中排放的大气污染物是造成我国大气污染的主要原因。本研究在分析我国主要行业煤炭消费现状的基础上,提出了煤炭消费重点行业——电力行业、炼焦行业和工业锅炉及炉窑2020年中期和2030年长期主要大气污染物污染控制技术路线以及煤炭清洁利用的中长期战略要点。

关键词: 煤炭;大气污染;能源结构;排放控制;技术路线    

盾构进出洞全方位风险控制冻结加固技术

嵇彭

《中国工程科学》 2012年 第14卷 第2期   页码 90-95

摘要:

在含水复杂的地质条件下采用水平冻结法进行盾构进出洞施工,可以通过延长(加深)水平冻结外圈冻结深度,使冻结加固体全方位包裹并超过盾构机本体,利用外圈冻结孔的维护冻结,将盾构推进过程中形成的微小流水通道中的泥土冻结成为冻土,封闭流水通道,较为有效地防止了流水、涌砂现象的发生。利用长距离水平钻孔防喷接驳器,简单方便地解决了在已施工完毕的端头井内长距离钻孔的难题。工程实践证明,全方位风险控制冻结加固技术在复杂地质条件下盾构进出洞施工中,简单易行,安全可靠,值得推广应用。

关键词: 复杂地质条件     盾构进出洞     全方位     风险控制     冻结加固    

苏通大桥主桥上部结构施工及控制技术研究

张鸿,罗承斌, 张永涛,游新鹏

《中国工程科学》 2009年 第11卷 第3期   页码 85-91

摘要:

苏通大桥是目前世界上已建成的最大跨径斜拉桥,其主桥上部结构施工,主要包括边跨辅助跨以及索塔区大块梁段安装,标准梁段安装以及中跨合龙几个阶段。其中大块梁段采用浮吊整体吊装,标准梁段采用桥面双吊机系统进行吊装,中跨合龙采取顶推辅助合龙方法。同时在施工过程中采用了全过程自适应几何控制方法,通过全过程精确控制结构构件的无应力尺寸与形状,以及实现控制系统和被控制系统相适应来达到控制桥梁结构最终线形和内力的目标。为了解决长悬臂主梁风致振动条件下的测量问题,采用了包括基于GPS和基于全站仪的两种动态几何监测系统。对上部

关键词: 苏通大桥     上部结构     施工方法     施工控制     几何控制     抗风措施    

标题 作者 时间 类型 操作

Review of fluid and control technology of hydraulic wind turbines

Maolin CAI, Yixuan WANG, Zongxia JIAO, Yan SHI

期刊论文

An adaptive sliding mode control technology for weld seam tracking

Jie LIU,Youmin HU,Bo WU,Kaibo ZHOU,Mingfeng GE

期刊论文

Bridging science, technology and policy in emerging contaminants control

期刊论文

Noise control technology for generator sets in enclosures

ZHANG Nailong, YANG Wentong, FEI Renyuan

期刊论文

The development of pollution control technology in coal combustion in China

XU Xuchang, ZHANG Hu, ZHUO Yuqun, TONG Huiling, WANG Shujuan, LI Yan

期刊论文

System engineering for water pollution control at the watershed level in China

Wei MENG,

期刊论文

Operation and control of flow manufacturing based on constraints management for high-mix/low-volume production

GUAN Zailin, PENG Yunfang, MA Li, ZHANG Chaoyong, LI Peigen

期刊论文

Precision forging technology for aluminum alloy

Lei DENG, Xinyun WANG, Junsong JIN, Juchen XIA

期刊论文

无人驾驶技术发展对策研究

杨艳明,高增桂,张子龙,沈悦,王林军

期刊论文

智能控制——超越世纪的目标——国际自动控制联合会第14次代表大会报告

宋健

期刊论文

电解锰行业污染防治最佳可行技术评估及污染减排潜力

李旭华,方刚,党春阁,于秀玲

期刊论文

Permitted emissions of major air pollutants from coal-fired power plants in China based on best available controltechnology

Xiaohui Song, Chunlai Jiang, Yu Lei, Yuezhi Zhong, Yanchao Wang

期刊论文

中长期煤利用中大气污染控制技术路线

郝吉明,王金南,王志轩,高翔,高晋生,李凡,姜培学,许嘉钰

期刊论文

盾构进出洞全方位风险控制冻结加固技术

嵇彭

期刊论文

苏通大桥主桥上部结构施工及控制技术研究

张鸿,罗承斌, 张永涛,游新鹏

期刊论文