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Hydraulic Pressure Extremes Ratio & Extremes Ratio Efficiencies

Qi Maolin

Strategic Study of CAE 2001, Volume 3, Issue 4,   Pages 73-75

Abstract:

This article applies basic formula to the calculation of a relationship between the hydraulic pressureextremes ratio of hydraulic system and the extremes ratio efficiencies.This relationship shows that the greater the hydraulic pressure extremes ratio is, the lower the extremesratio efficiencies are.The article holds that the hydraulic pressure extremes ratio can be designed and chosen.

Keywords： hydraulic pressure extremes ratio     extremes ratio efficiencies     hydraulic system    

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Simulation analysis of pressure regulation of hydraulic thrust system on a shield tunneling machine

Zhibin LIU, Haibo XIE, Huayong YANG

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 3,   Pages 377-382 doi: 10.1007/s11465-011-0226-y

Abstract:

Hydraulic thrust system is an important system in a shield tunneling machine.Pressure regulation of thrust cylinders is the most important function for thrust system during tunnelIn this paper, a hydraulic thrust system is explained, and a corresponding simulation model is carriedPump displacement may have a greater effect on pressure regulation and oil supply flow rate should beA exacting situation is simulated to explain how pressure regulation works during tunnel excavation.

Keywords： tunnel     hydraulic thrust system     pressure regulation     simulation    

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Hydraulic fracturing pressure of concentric double-layered cylinder in cohesive soil

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 4,   Pages 937-947 doi: 10.1007/s11709-021-0754-4

Abstract: First, an analytical solution for fracturing pressure in two different concentric regions of soil wasThen, several triaxial hydraulic fracturing tests were carried out to validate the analytical solutionFirst, there is a linear relationship between the fracturing pressure and confining pressure in concentricinternal-layer soil is softer than the external-layer soil, the presence of internal soil on the fracturing pressureMoreover, the influence of strength distinction between the two layers on the fracturing pressure is

Keywords： hydraulic fracturing pressure     layered     cavity expansion theory     triaxial fracturing test     cohesive soil    

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A novel high-temperature and high-pressure hydraulic pump based on mononeuron control

Linhui ZHAO, Xin FANG

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 2,   Pages 219-223 doi: 10.1007/s11465-009-0024-y

Abstract: Based on structures and characteristics of traditional hydraulic pumps, this paper proposes a novel high-temperatureand high-pressure hydraulic pump (HHHP) that can work under 150°C and 28 MPa to overcome problems ofTherefore, reduced fluctuations and stable pressure output is obtained.

Keywords： mononeuron PID control     hydraulic pump     pressure fluctuation    

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Improvement of engine performance with high compression ratio based on knock suppression using Millercycle with boost pressure and split injection

Haiqiao WEI, Jie YU, Lei ZHOU

Frontiers in Energy 2019, Volume 13, Issue 4,   Pages 691-706 doi: 10.1007/s11708-019-0621-3

Abstract: In theory, high compression ratio has the potential to improve the thermal efficiency and promote theHowever, the application of high compression ratio is substantially limited by the knock in practicalon a gasoline engine based on the Miller cycle with boost pressure and split injection.It was found that a high level of Miller cycle with a higher boost pressure could be used in CR12 tocompression ratio and high load.

Keywords： high compression ratio     knock     Miller cycle     split injection     engine performance    

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Characters of Future Aircraft Hydraulic System

Wang Zhanlin,Chen Bin

Strategic Study of CAE 1999, Volume 1, Issue 3,   Pages 5-10

Abstract: High density of driving power, fast response, high rigidity and high-precision are the advantages of hydraulicAll of flight actuator and transmitting systems of today´s aircrafts are nearly driven by hydraulicIn this paper, main developmental trend of airborne hydraulic system, especially for military aircraftLight weight, small size, high-pressure, high power, variable pressure, intellectualization, integrationEspecially, high-pressure, variable pressure hydraulic intelligent pump source system is very important

Keywords： airborne hydraulic systems     high-pressure     variable pressure     redundancy     power-by-wire    

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Effect of cutterhead configuration on tunnel face stability during shield machine maintenance outages

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 4,   Pages 522-532 doi: 10.1007/s11709-023-0930-9

Abstract: Pressure maintenance openings are typically used under complicated hydrogeological conditions.Owing to the high risk of face failure, the necessity of support pressure when cutterhead support isimplemented and a method for determining the value of compressed air pressure using different supportThe required compressed air pressure increases significantly as the support ratio decreases.To satisfy the requirement of chamber openings at atmospheric pressure, the stratum reinforcement strength

Keywords： tunnel face stability     cutterhead configuration     aperture ratio     pressure gradient     support ratio    

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Micro-hydromechanical deep drawing of metal cups with hydraulic pressure effects

Liang LUO, Zhengyi JIANG, Dongbin WEI, Xiaogang WANG, Cunlong ZHOU, Qingxue HUANG

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 1,   Pages 66-73 doi: 10.1007/s11465-018-0468-z

Abstract: Micro-hydromechanical deep drawing (MHDD), a typical microforming method, has been developed to take advantage of hydraulicWith reduced dimensions, the hydraulic pressure development changes; accordingly, the lubrication conditionMoreover, defined wrinkle indexes have been shown to have a complex relationship with hydraulic pressureHigh hydraulic pressure can increase the maximum drawing ratio (drawn cup height), whereas the surfacefinish represented by the wear is not linearly dependent on the hydraulic pressure due to the wrinkles

Keywords： micro-hydromechanical deep drawing     microforming     size effects     lubrication     Voronoi    

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Wind tunnel test study on the wind pressure coefficient of claddings of high-rise buildings

Yong QUAN, Yi LIANG, Fei WANG, Ming GU

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 4,   Pages 518-524 doi: 10.1007/s11709-011-0128-4

Abstract: The area-averaged most unfavorable wind pressure coefficients (MUWPCs) on various regions of buildingsurfaces and the influence of the side ratio and the terrain category were studied based on wind tunnelarea-averaged MUWPCs in the middle-height edge areas generally increased with an increasing / side ratio

Keywords： side ratio     area-averaged pressure coefficients     cladding     terrain category    

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Optimal ratio of bend channel in centrifugal compressor

WEN Suping, HU Xiaowen, LI Tingbin, ZHANG Yong, WANG Jun

Frontiers in Energy 2008, Volume 2, Issue 4,   Pages 381-385 doi: 10.1007/s11708-008-0084-4

Abstract: The results indicate that there is an optimal ratio for increasing the stage efficiency to the highestThe change in ratio significantly affects the flow angle of the bend channel outlet.The prime reason for the total pressure loss in the bend channel is the wall friction in the bend channel

Keywords： specific compressor     different     centrifugal compressor     pressure     impeller    

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Application of Hydraulic Pressure Sensore System on Riverb ed ErosionDepth for Real-time Monitoring

Chen Zhijian,Liu Dawei,Zhang Weiwen

Strategic Study of CAE 2007, Volume 9, Issue 5,   Pages 17-21

Abstract:  Application,  technical difficulty and its settlement scheme of hydraulic pressure sensors

Keywords： hydraulic pressure sensor     tidal reach     group piled foundation     local scour     real-time monitoring    

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Research and Application of Engineering Water-pressure Blasting for Economizing Energy and Environmental

He Guangyi,Duan Changyan,Jing Shan,Wang Taichao

Strategic Study of CAE 2003, Volume 5, Issue 9,   Pages 43-48

Abstract:

The engineering water-pressure blasting for economizing energy and environmental protection isa newexperiment of the technique have been introduced in respect of enhancing explosive energy utilization ratio

Keywords： engineering water-pressure blasting     simulation experiment     energy utilization ratio    

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Microseismic monitoring technology

Tang Chunhua,Gu Guangqing

Strategic Study of CAE 2012, Volume 14, Issue 4,   Pages 95-99

Abstract:

Microseismic (MS) monitoring is a hot topic in the applied geophysics recently. The MS mechanism and histories are introduced firstly in this article, and then the instruction of the MS equipment such as acquisition strategies, optimal sensors, array design, digital-signal processing, event location, velocity calibration, and monitoring deployment, is discussed. MS is a great technology with a long future, and we need to foster the understanding and acceptance of this technology.

Keywords： microseismic monitoring     hydraulic fracturing     oil and natural gas     SNR (signal to noise ratio)     event    

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Pressure Drop Characteristics of Flow Boiling in Microchannel With Low Aspect Ratio

Zhang Binglei,Xu Jinliang and Xiao Zejun

Strategic Study of CAE 2007, Volume 9, Issue 12,   Pages 86-93

Abstract: Pressure drops of flow boiling in a single microchannel having low aspect ratio were studied with effectsThe comparison indicates that the homogeneous flow model cannot predict the twophase pressure drop wellChisholm,Lee and Lee,Mishima,Qu and Mudawar , separated flow model also failed to predict the twophase pressurefor C which decreased with the decreasing mass flux .A new correlation to predict the twophase flow pressuremicrochannels was developed in the form of the LockhartMartinelli correlation .It includes the effect of the hydraulic

Keywords： pressure drop characteristics；homogeneous flow model；separated flow model；microchannel；flow boiling    

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Experimental study on slurry-induced fracturing during shield tunneling

Teng WANG, Dajun YUAN, Dalong JIN, Xinggao LI

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 2,   Pages 333-345 doi: 10.1007/s11709-021-0718-8

Abstract: and water pressure.Hydraulic fracturing may occur and cause a significant decrease in the support pressure if the slurryPreventing the occurrence of hydraulic fracturing in a slurry shield requires investigating the effectsof related influencing factors on the hydraulic fracturing pressure and fracture pattern.In this study, a hydraulic fracturing apparatus was developed to test the slurry-induced fracturing of

Keywords： slurry shield tunneling     hydraulic fracturing test     fracturing pressure     fracture dip     unconfined compressive    

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Title Author Date Type Operation

Hydraulic Pressure Extremes Ratio & Extremes Ratio Efficiencies

Qi Maolin

Journal Article

Simulation analysis of pressure regulation of hydraulic thrust system on a shield tunneling machine

Zhibin LIU, Haibo XIE, Huayong YANG

Journal Article

Hydraulic fracturing pressure of concentric double-layered cylinder in cohesive soil

Journal Article

A novel high-temperature and high-pressure hydraulic pump based on mononeuron control

Linhui ZHAO, Xin FANG

Journal Article

Improvement of engine performance with high compression ratio based on knock suppression using Millercycle with boost pressure and split injection

Haiqiao WEI, Jie YU, Lei ZHOU

Journal Article

Characters of Future Aircraft Hydraulic System

Wang Zhanlin,Chen Bin

Journal Article

Effect of cutterhead configuration on tunnel face stability during shield machine maintenance outages

Journal Article

Micro-hydromechanical deep drawing of metal cups with hydraulic pressure effects

Liang LUO, Zhengyi JIANG, Dongbin WEI, Xiaogang WANG, Cunlong ZHOU, Qingxue HUANG

Journal Article

Wind tunnel test study on the wind pressure coefficient of claddings of high-rise buildings

Yong QUAN, Yi LIANG, Fei WANG, Ming GU

Journal Article

Optimal ratio of bend channel in centrifugal compressor

WEN Suping, HU Xiaowen, LI Tingbin, ZHANG Yong, WANG Jun

Journal Article

Application of Hydraulic Pressure Sensore System on Riverb ed ErosionDepth for Real-time Monitoring

Chen Zhijian,Liu Dawei,Zhang Weiwen

Journal Article

Research and Application of Engineering Water-pressure Blasting for Economizing Energy and Environmental

He Guangyi,Duan Changyan,Jing Shan,Wang Taichao

Journal Article

Microseismic monitoring technology

Tang Chunhua,Gu Guangqing

Journal Article

Pressure Drop Characteristics of Flow Boiling in Microchannel With Low Aspect Ratio

Zhang Binglei,Xu Jinliang and Xiao Zejun

Journal Article

Experimental study on slurry-induced fracturing during shield tunneling

Teng WANG, Dajun YUAN, Dalong JIN, Xinggao LI

Journal Article