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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: Owing to the high risk of face failure, the necessity of support pressure when cutterhead support isIn this study, a non-fully chamber supported rotational failure model considering cutterhead supportDisregarding the supporting effect of the cutterhead will result in a tunnel face with underestimatedpressure, the stratum reinforcement strength and range at the shield end are provided based on different cutterhead

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

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Effects of green roof damping and configuration on structural seismic response

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 8,   Pages 1133-1144 doi: 10.1007/s11709-023-0959-9

Abstract: Sustainable structures are critical for addressing global climate change. Hence, their structural resilience or ability to recover from natural events must be considered comprehensively. Green roofs are a widely used sustainable feature that improve the environment while providing excellent occupant amenity. To expand their usage, their inherent damping and layout sensitivity to seismic performance are investigated in this study. The soil of a green roof can serve as a damper to dissipate the energy generated by earthquakes or other dynamic events. Results of preliminary analysis show that a green roof soil can increase localized damping by 2.5% under both dry and saturated conditions. Based on these findings, nonlinear time-history analyses are conducted on a three-story building in SAP2000 to monitor the structural behavior with and without a green roof. The increased damping in the green roof soil is beneficial to the structural performance, i.e., it reduces the building displacement and acceleration by 10% and 12%, respectively. Additionally, certain configurations are more effective and beneficial to the structural response than others, which suggests the possibility of design optimization. Based on the findings of this study, new methods of modeling and considering green roofs in structural design are established.

Keywords： green infrastructure     green roof     structural resilience     seismic design    

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A Closer Look at the Design of Cutterheads for Hard Rock Tunnel-Boring Machines

Jamal Rostami, Soo-Ho Chang

Engineering 2017, Volume 3, Issue 6,   Pages 892-904 doi: 10.1016/j.eng.2017.12.009

Abstract: no part of the machine plays a more crucial role in the efficient operation of the machine than its cutterheadThe design of the cutterhead impacts the efficiency of cutting, the balance of the head, the life ofOverall, cutterhead design heavily impacts the rate of penetration (ROP), rate of machine utilization

Keywords： TBM cutterhead design     Cutterhead layout     Disk cutters     Cutting pattern     TBM efficiency    

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Optimizing the configuration of a clearwell by integrating pilot and full-scale tracer testing

LIU Wenjun, DU Zhipeng, JIN Junwei

Frontiers of Environmental Science & Engineering 2007, Volume 1, Issue 3,   Pages 270-275 doi: 10.1007/s11783-007-0045-x

Abstract: confirmed that the installation of baffles within clearwells is an efficient way to optimize their configuration
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Tracing the impact of stack configuration on interface resistances in reverse electrodialysis by in situ

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 4, doi: 10.1007/s11783-021-1480-9

Abstract:

• RED performance and stack resistance were studied by EIS and LSV.

Keywords： Reverse electrodialysis     Electrochemical impedance spectroscopy     Concentration polarization     Spacer shadow effect    

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Passive convergence-permeable reactive barrier (PC-PRB): An effective configuration to enhance hydraulic

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 12, doi: 10.1007/s11783-022-1591-y

Abstract:

● A novel PRB configuration based on passive convergent flow effect

Keywords： Passive convergence-permeable reactive barrier (PC-PRB)     Permeable reactive barrier configuration     Numerical    

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Efficient Configuration Space Construction and Optimization for Motion Planning Article

Jia Pan, Dinesh Manocha

Engineering 2015, Volume 1, Issue 1,   Pages 46-57 doi: 10.15302/J-ENG-2015009

Abstract:

The configuration space is a fundamental concept that is widely used in algorithmic robotics.In this paper, we survey some of our recent work on solving two important challenges related to configurationspaces: ① how to efficiently compute an approximate representation of high-dimensional configurationThese algorithms perform collision queries on many configuration samples., which quickly converges to the exact configuration space.

Keywords： configuration space     motion planning     GPU parallel algorithm    

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Elevator Configuration Based on the Markov Network Queuing Model

Zong Qun,Cheng Yiju,Song Junyuan

Strategic Study of CAE 2003, Volume 5, Issue 10,   Pages 69-72

Abstract: Based on the model elevator configuration parameters of the serving stations are calculated, comparingMeanwhile the result shows the validity and feasibility of the method applied to elevator configuration

Keywords： Markov network queuing theory     elevator traffic model     optimizing elevator configuration    

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Evaluation and Recombination of Property Right Configuration for Urban Water Supply System

Xiao Wen,Ouyang Fangrui,Wang Xianjia

Strategic Study of CAE 2004, Volume 6, Issue 7,   Pages 48-52

Abstract:

In this paper, two basic models of recombination of property right configuration for urban water supplyThe evaluation index and methodology of property right configuration for urban water supply system areThe characteristics of the two property right configuration models and actions of different benefit bodies

Keywords： urban water supply system     property right configuration     recombination of property right     evaluation of    

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Effects of sheet thickness and material on the mechanical properties of flat clinched joint

Chao CHEN, Huiyang ZHANG, Shengdun ZHAO, Xiaoqiang REN

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 2,   Pages 410-419 doi: 10.1007/s11465-020-0618-y

Abstract: The flat clinching process is attracting a growing attention in the joining field of lightweight materials because it avoids the geometric protrusion that appears in the conventional clinching process. In this paper, the effects of sheet thickness and material on the mechanical properties of the clinched joint were studied. Al1060 and Al2024 sheets with 2 mm thickness were employed to develop the clinched joint by using different material configurations, and Al1060 sheets with 2.5- and 1.5-mm thicknesses were used to produce the clinched joint by using different thickness configurations. The clinched joints using various sheet configurations were sectioned, and dimensional analysis was conducted. Cross-tensile and shearing tests were carried out to analyze the mechanical properties of the clinched joint, including tensile strength, shearing strength, and absorbed energy. In addition, the failure modes of the clinched joints were discussed. Results indicated that the clinched joint with a stiff top sheet had increased static strength regardless of the test type. The clinched joint with a thick top sheet demonstrated lower static strength than the joint with a thick bottom sheet in the cross-tensile test. However, this result was reversed in the shearing tests. The flat clinching process has a great potential in joining dissimilar and various thickness materials.

Keywords： clinched joint     flat clinching process     thickness configuration     material configuration     mechanical property    

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State-of-art review of the optimization methods to design the configuration of hybrid renewable energy

Maurizio FACCIO, Mauro GAMBERI, Marco BORTOLINI, Mojtaba NEDAEI

Frontiers in Energy 2018, Volume 12, Issue 4,   Pages 591-622 doi: 10.1007/s11708-018-0567-x

Abstract: including loss of power supply probability (LPSP) and loss of load probability (LLP), cost, sizing (configurationFurthermore, it has been demonstrated that, integration of the PV, wind and battery is the most frequent configuration

Keywords： hybrid renewable energy systems (HRESs)     design and optimization     environmental pollutions     PV array     wind turbines (WTs)     inverter     diesel generator (DG)    

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Flutter control effect and mechanism of central-slotting for long-span bridges

YANG Yongxin, GE Yaojun, XIANG Haifan

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 3,   Pages 298-304 doi: 10.1007/s11709-007-0039-6

Abstract: The control effect of central-slotting depends on the aerodynamic configuration of the original girder

Keywords： aerodynamic configuration     aerodynamic performance     flutter mechanism     aerodynamic stability     theoretical    

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A Research on the Aerodynamic Characteristics of a Small Aspect Ratio, High Lift Fighter Configuration

Song Wencong,Xie Pin,Zheng Sui,Li Yupu

Strategic Study of CAE 2001, Volume 3, Issue 8,   Pages 70-75

Abstract:

Focused on the features of stealth, super-maneuverability and supersonic cruise of the future fighter, the authors identified the main difficulties and gave some practical solutions to lift-drag characteristics at sub-/tran-sonic speed, high A. O. A. aerodynamic performances at low speed and supersonic drag characteristics. The authors believed that design goals could only be achieved by studying flow principles deeply, digging up the potentials of present aerodynamic improving measures, developing new aerodynamic concepts, adopting interrelated integration and flight control measures and compromising on the multiple design points.

Keywords： aerodynamic configuration     supersonic cruise     stealth     post-stall maneuvers    

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Energy storage resources management: Planning, operation, and business model

Frontiers of Engineering Management 2022, Volume 9, Issue 3,   Pages 373-391 doi: 10.1007/s42524-022-0194-4

Abstract: However, considering the costs and the input/output characteristics of ESS, both the initial configurationFirst of all, in terms of planning and configuration, it is investigated from capacity planning, location

Keywords： energy storage system     energy storage resources management     planning configuration     operational management    

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Innovative stair climber using associated wheels

Girish Sudhir MODAK,Manmohan Manikrao BHOOMKAR

Frontiers of Mechanical Engineering 2016, Volume 11, Issue 3,   Pages 299-310 doi: 10.1007/s11465-016-0374-1

Abstract:

The study proposes an innovative and completely new but low-cost configuration of a platform that

Keywords： stair-climbing platform     matching wheels     impaired mobility     affordable configuration    

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Title Author Date Type Operation

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

Journal Article

Effects of green roof damping and configuration on structural seismic response

Journal Article

A Closer Look at the Design of Cutterheads for Hard Rock Tunnel-Boring Machines

Jamal Rostami, Soo-Ho Chang

Journal Article

Optimizing the configuration of a clearwell by integrating pilot and full-scale tracer testing

LIU Wenjun, DU Zhipeng, JIN Junwei

Journal Article

Tracing the impact of stack configuration on interface resistances in reverse electrodialysis by in situ

Journal Article

Passive convergence-permeable reactive barrier (PC-PRB): An effective configuration to enhance hydraulic

Journal Article

Efficient Configuration Space Construction and Optimization for Motion Planning

Jia Pan, Dinesh Manocha

Journal Article

Elevator Configuration Based on the Markov Network Queuing Model

Zong Qun,Cheng Yiju,Song Junyuan

Journal Article

Evaluation and Recombination of Property Right Configuration for Urban Water Supply System

Xiao Wen,Ouyang Fangrui,Wang Xianjia

Journal Article

Effects of sheet thickness and material on the mechanical properties of flat clinched joint

Chao CHEN, Huiyang ZHANG, Shengdun ZHAO, Xiaoqiang REN

Journal Article

State-of-art review of the optimization methods to design the configuration of hybrid renewable energy

Maurizio FACCIO, Mauro GAMBERI, Marco BORTOLINI, Mojtaba NEDAEI

Journal Article

Flutter control effect and mechanism of central-slotting for long-span bridges

YANG Yongxin, GE Yaojun, XIANG Haifan

Journal Article

A Research on the Aerodynamic Characteristics of a Small Aspect Ratio, High Lift Fighter Configuration

Song Wencong,Xie Pin,Zheng Sui,Li Yupu

Journal Article

Energy storage resources management: Planning, operation, and business model

Journal Article

Innovative stair climber using associated wheels

Girish Sudhir MODAK,Manmohan Manikrao BHOOMKAR

Journal Article