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Application of cable-supported spatial grid in dry coal shed

XING Haidong, HAO Jiping, XU Guobin

Frontiers of Structural and Civil Engineering 2008, Volume 2, Issue 1, Pages 26-29 doi: 10.1007/s11709-008-0008-8

Abstract: The influence of configuration of cable on the force of cable and beam, the ratio of beam force to cableforce and the deflection of span was investigated, and a rational configuration of cable was obtained

Keywords： dry material strength low rational configuration influence

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Effects of green roof damping and configuration on structural seismic response

Frontiers of Structural and Civil Engineering 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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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 long-distance advancement or obstacles, shield tunneling machines are typically shut down for maintenance. Engineering safety during maintenance outages is determined by the stability of the tunnel face. Pressure maintenance openings are typically used under complicated hydrogeological conditions. The tunnel face is supported by a medium at the bottom of the excavation chamber and compressed air at the top. Owing to the high risk of face failure, the necessity of support pressure when cutterhead support is implemented and a method for determining the value of compressed air pressure using different support ratios must to be determined. In this study, a non-fully chamber supported rotational failure model considering cutterhead support is developed based on the upper-bound theorem of limit analysis. Numerical simulation is conducted to verify the accuracy of the proposed model. The results indicate that appropriately increasing the specific gravity of the supporting medium can reduce the risk of collapse. The required compressed air pressure increases significantly as the support ratio decreases. Disregarding the supporting effect of the cutterhead will result in a tunnel face with underestimated stability. To satisfy the requirement of chamber openings at atmospheric pressure, the stratum reinforcement strength and range at the shield end are provided based on different cutterhead aperture ratios.

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

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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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Implementation of an adaptive feed speed 3D NURBS interpolation algorithm

LIANG Hong-bin, WANG Yong-zhang, LI Xia

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 4, Pages 403-408 doi: 10.1007/s11465-006-0047-6

Abstract: NURBS (non-uniform rational B-spline) interpolation algorithms have been provided in modern CNC (computer

Keywords： NURBS parametric rational B-spline second-order non-uniform rational precision

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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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Genome reprogramming for synthetic biology

Kylie Standage-Beier,Xiao Wang

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 1, Pages 37-45 doi: 10.1007/s11705-017-1618-2

Abstract: Tools such as clustered regularly interspace short palindromic repeats enable RNA-guided rational redesign

Keywords： CRISPR genome engineering synthetic biology rational design

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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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Evolutionary Decision-Making and Planning for Autonomous Driving Based on Safe and Rational Exploration

Kang Yuan,Yanjun Huang,Shuo Yang,Zewei Zhou,Yulei Wang,Dongpu Cao,Hong Chen,

Engineering doi: 10.1016/j.eng.2023.03.018

Abstract: data-driven decision-making module based on deep reinforcement learning (DRL) is developed to pursue a rationalA motion envelope is established and embedded into a rational exploration and exploitation scheme, which, and the results show that the proposed online-evolution framework is able to generate safer, more rational

Keywords： Autonomous driving Decision-making Motion planning Deep reinforcement learning Model predictive control

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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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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)