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Experimental and CFD analysis of nozzle position of subsonic ejector

Xilai ZHANG, Shiping JIN, Suyi HUANG, Guoqing TIAN

Frontiers in Energy 2009, Volume 3, Issue 2,   Pages 167-174 doi: 10.1007/s11708-009-0001-5

Abstract: The influence of nozzle position on the performance of an ejector was analyzed qualitatively with freeExperimental investigations and computational fluid dynamics (CFD) analysis of the nozzle position ofThe results show that there is an optimum nozzle position for the ejector.Moreover, the nozzle position of an ejector is not a fixed value, but is influenced greatly by the flow

Keywords： ejector     nozzle position     ejecting coefficient     CFD    

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Robust energy-efficient train speed profile optimization in a scenario-based position–time–speed network

Frontiers of Engineering Management 2021, Volume 8, Issue 4,   Pages 595-614 doi: 10.1007/s42524-021-0173-1

Abstract: Specifically, we first construct a scenario-based position–time–speed (PTS) network by considering resistance

Keywords： robust train speed profile     percentile reliability model     scenario-based position–time–speed network    

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Strategic position and development prospects of nuclear energy in China

SHEN Wenquan

Frontiers in Energy 2007, Volume 1, Issue 2,   Pages 125-128 doi: 10.1007/s11708-007-0015-9

Abstract: By analyzing the challenges of China s energy supply, an excellent perspective of nuclear power development in the country has been described. Taking into account the near-, mid-, and long-term development requirements, a comprehensive, coordinated and sustainable nuclear power program is proposed. Thus, our national nuclear industry can not only catch up with the world s advanced level in proper time, but also possess enough stamina for sustainability.

Keywords： development     excellent perspective     long-term development     comprehensive     national    

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Air-bearing position optimization based on dynamic characteristics of ultra-precision linear stages

CHEN Xuedong, LI Zhixin

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 4,   Pages 400-407 doi: 10.1007/s11465-008-0060-z

Abstract: characteristics including mode frequency, mode shape, and response amplitude are obviously changed with the positionThe combined optimization method is used to optimize the air-bearings position.The method can be generalized to the connection position of different components in manufacture elementsand to implement the system dynamic characteristics optimization when the connection position can be

Keywords： manufacture     different     interaction     air-bearings     response amplitude    

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Task-space position/attitude tracking control of FAST fine tuning system

QI Lin, ZHANG Hui, DUAN Guanghong

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 4,   Pages 392-399 doi: 10.1007/s11465-008-0056-8

Abstract: This paper addresses the task-space position/attitude tracking control of a suspended parallel robot,the quaternion algebra, a novel model-independent task-space PD controller that ensures end-effector position

Keywords： telescope     five-hundred     end-effector     controller     simulation    

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Resource evaluation，position and distribution of tight sandstone gas in China

Zhang Guosheng ,Deng Songtao

Strategic Study of CAE 2012, Volume 14, Issue 6,   Pages 87-93

Abstract:

Based on the reservoir forming condition research of tight sandstone gas in Ordos Basin, Sichuan Basin and Tarim Basin, the authors give two types of tight sandstone gas reservoirs,sloped lithologic type and structural type which are the main of tight sandstone gas reservoir. The favorable gas region is predicted with multi-factor overlay method. And based on the existed tight sandstone gas reservoir analysis, the authors get the main parameters such as reservoir abundance, gas-bearing area coefficient which are necessary for gas resource calculation of the large basin through analogism method. According to the result of this resource evaluation, the tight sandstone gas geological recoverable resource in China is 9.2×1012～13.4×1012 m3 which is widely distributed over coal measure basins. The tight sandstone gas is the most realistic source in present. Due to the support of government policies and the motivation of technological progress, it might become one of the pillar sources in natural gas development in 10 to 20 years.

Keywords： tight sandstone gas     distribution feature     resource potential     development position    

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Initial position estimation strategy for a surface permanent magnet synchronous motor used in hybrid Article

Bing TIAN,Qun-tao AN,Li SUN,Dong-yang SUN,Jian-dong DUAN

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 8,   Pages 803-813 doi: 10.1631/FITEE.1500298

Abstract: model for surface permanent magnet synchronous motors (SPMSMs) is adopted to estimate the initial rotor positionUsually, the accuracy of initial rotor position estimation for SPMSMs relies on magnetic saturation.identified with the aid of the saturation evaluation function, based on which an estimation of the positionprocedure, a special demodulation is suggested to extract signals of iron core saturation and rotor position

Keywords： Surface permanent magnet synchronous motor (SPMSM)     Initial position estimation     Nonlinear model     Hybridinjection     Position observer    

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Planet position errors in planetary transmission: Effect on load sharing and transmission error

Miguel IGLESIAS, Alfonso FERNáNDEZ, Ana DE-JUAN, Ramón SANCIBRIáN, Pablo GARCíA

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 1,   Pages 80-87 doi: 10.1007/s11465-013-0362-7

Abstract: gear transmissions developed by the authors is used to study the influence of carrier planet pin hole positionThe influence of carrier planet pin hole position errors on the planet load sharing is studied, and severalTangential and radial planet pin hole position errors are considered independently, and the effect of

Keywords： gear     planetary     epicyclic     transmission     load sharing     transmission error    

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Prospects and Strategic Position on Unconventional Natural Gas Development & Utilization in China

The Project Team of “China Unconventional Natural Gas Development & Utilization Strategic Research

Strategic Study of CAE 2015, Volume 17, Issue 9,   Pages 6-10

Abstract:

The unconventional natural gas resources is abundant in China but with low degree of development and utilization. Moreover, there is advanced technology and experiences from outside China can be learned. It is of great strategic significance to accelerate the development and utilization of unconventional natural gas resources for economic and social development as well as the energy security. Based on the evaluation of the potential and exploitation trends of four types of unconventional natural gas resources, some strategies and measures were recommended in this paper. The studies suggested that the grand total technically recoverable resources of shale gas, tight gas and coal-bed methane in China is approximately 3.1×1013 m3, which is 1.5 times that of conventional natural gas resources. Both technological innovation and policy support from the government are the key to achieve the large-scale development and utilization of unconventional natural gas resources. A three-step strategy can be applied in the development and utilization of unconventional natural gas in China. The output of unconventional natural gas is predicted to draw equal with that of the conventional natural gas around 2020; it is expected to reach approximately 3×1011 m3 around 2030, accounting for 2/3 of the national total. It will be the main contributor for the sustainable and sound development of China’s natural gas industry.

Keywords： unconventional natural gas     resource potential     development and utilization     strategic position    

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Effect of Position of Air Supply Opening on the Efficiency of Smoke Extraction in an Underground Long

Hu Longhua,Huo Ran,Li Yuanzhou,Yi Liang,Wang Haobo

Strategic Study of CAE 2005, Volume 7, Issue 5,   Pages 90-92

Abstract: and smoke exhaust opening, were conducted in an 88 m long underground corridor to study the effect of position

Keywords： air supply position     smoke extraction efficiency     underground long channel     full scale test     fire    

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Original Position Statistic Distribution Analysis (OPA) Study on the Quality of Billet

Wang Haizhou,Li Meiling,Chen Jiwen,Wu Chao

Strategic Study of CAE 2003, Volume 5, Issue 10,   Pages 34-42

Abstract: The weight ratio of carbon content at each original position of billet was suggested to express the degree

Keywords： original position statistic distribution analysis     billet     degree of porosity     degree of homogeneity     inclusion    

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Virtual-position Reading Method—a Novel Method for Error Motion and Form Error Separation

Hong Maisheng,Li Zijun,Su Heng,Ye Feifan

Strategic Study of CAE 2002, Volume 4, Issue 10,   Pages 48-51

Abstract:

On the basis of signal re-organization, a novel method named virtual-position reading method is proposed

Keywords： virtual-position reading     signal re-organization     form error     error motion     error separation techniques    

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Original position statistic distribution analysis (OPA) on the quality of mould steel billet

Wang Haizhou,Li Meiling,Zhang Xiuxin,Wu Chao

Strategic Study of CAE 2009, Volume 11, Issue 10,   Pages 39-47

Abstract: style="text-align: justify;">Through the analysis of mould steel from different sources by the original positionstatistic distribution analysis (OPA), new information on the position, state and content distribution

Keywords： original position statistic distribution analysis     mould steel     degree of statistic segregation     degree    

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Optimal Robust Control of AC Position Servo System for Multiple Rockets

Chai Huawei,Ma Dawei,Li Zhigang,Le Guigao,Wang Feng

Strategic Study of CAE 2007, Volume 9, Issue 10,   Pages 83-87

Abstract:

In order to realize high speed and high precision position control in

Keywords： rocket mortar     AC position servo system     robust control     optimal control    

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Original position statistic distribution analysis characterization of niobium on the vertical section

Wang Haizhou,Li Meiling,Zhuang Jingyun

Strategic Study of CAE 2011, Volume 13, Issue 10,   Pages 19-27

Abstract: on the vertical section of casting of GH169 superalloy pneumatic plate wheel was studied by original position

Keywords： original position statistic distribution analysis     superalloy pneumatic plate wheel     niobium     statistic    

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Title Author Date Type Operation

Experimental and CFD analysis of nozzle position of subsonic ejector

Xilai ZHANG, Shiping JIN, Suyi HUANG, Guoqing TIAN

Journal Article

Robust energy-efficient train speed profile optimization in a scenario-based position–time–speed network

Journal Article

Strategic position and development prospects of nuclear energy in China

SHEN Wenquan

Journal Article

Air-bearing position optimization based on dynamic characteristics of ultra-precision linear stages

CHEN Xuedong, LI Zhixin

Journal Article

Task-space position/attitude tracking control of FAST fine tuning system

QI Lin, ZHANG Hui, DUAN Guanghong

Journal Article

Resource evaluation，position and distribution of tight sandstone gas in China

Zhang Guosheng ,Deng Songtao

Journal Article

Initial position estimation strategy for a surface permanent magnet synchronous motor used in hybrid

Bing TIAN,Qun-tao AN,Li SUN,Dong-yang SUN,Jian-dong DUAN

Journal Article

Planet position errors in planetary transmission: Effect on load sharing and transmission error

Miguel IGLESIAS, Alfonso FERNáNDEZ, Ana DE-JUAN, Ramón SANCIBRIáN, Pablo GARCíA

Journal Article

Prospects and Strategic Position on Unconventional Natural Gas Development & Utilization in China

The Project Team of “China Unconventional Natural Gas Development & Utilization Strategic Research

Journal Article

Effect of Position of Air Supply Opening on the Efficiency of Smoke Extraction in an Underground Long

Hu Longhua,Huo Ran,Li Yuanzhou,Yi Liang,Wang Haobo

Journal Article

Original Position Statistic Distribution Analysis (OPA) Study on the Quality of Billet

Wang Haizhou,Li Meiling,Chen Jiwen,Wu Chao

Journal Article

Virtual-position Reading Method—a Novel Method for Error Motion and Form Error Separation

Hong Maisheng,Li Zijun,Su Heng,Ye Feifan

Journal Article

Original position statistic distribution analysis (OPA) on the quality of mould steel billet

Wang Haizhou,Li Meiling,Zhang Xiuxin,Wu Chao

Journal Article

Optimal Robust Control of AC Position Servo System for Multiple Rockets

Chai Huawei,Ma Dawei,Li Zhigang,Le Guigao,Wang Feng

Journal Article

Original position statistic distribution analysis characterization of niobium on the vertical section

Wang Haizhou,Li Meiling,Zhuang Jingyun

Journal Article