一、SCI 2条
*Record 1 of 2. Search terms matched: CHONGQING 400074(2); CHONGQING JIAOTONG(2)
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Title: Experiment on the ignition performances of a free-piston diesel engine alternator
Authors: Yuan, CH; Ren, HG; Xu, J
Author Full Names: Yuan, Chenheng; Ren, Haigen; Xu, Jing
Source: APPLIED THERMAL ENGINEERING, 134 537-545; 10.1016/j.applthermaleng.2018.02.034 APR 2018
Language: English
Abstract: The free-piston engine alternator (FPEA) is an unconventional engine. The initialization of the new engine differs from the conventional engine due to the feature that it eliminates the crankshaft and flywheel system. This study performed an experiment to analyze the ignition characteristics of a compression ignited diesel FPEA. Meanwhile, the effects of injection position and starting force on the ignition were also investigated. The experimental result shows that the larger starting force does not absolutely bring about higher ignition efficiency for the initialization of FPEA, although it brings in a greater possibility for the engine to gain a higher compression ratio from its resonant reciprocation. The large, but inappropriate starting force may lead to a serious incomplete combustion for the ignition, and the level of combustion completion of ignition is influenced by the injection triggering advance position (ITAP). The experiment suggests that properly enlarging the ITAP can enhance the combustion efficiency of the ignition and is beneficial to enlarge the compression ratio of opposite cylinder, but an excessive ITAP may advance the injection and ignition cycle and further induce a misfire for the FPEA.
ISSN: 1359-4311
IDS Number: GA7EL
Unique ID: WOS:000428497300052
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Title: Deformation of a sandstone-mudstone particle mixture induced by periodic saturation
Authors: Wang, JJ; Qiu, ZF; Bai, JP; Yu, C; Liu, MW
Author Full Names: Wang, Jun-Jie; Qiu, Zhen-Feng; Bai, Jiping; Yu, Cheng; Liu, Ming-Wei
Source: MARINE GEORESOURCES & GEOTECHNOLOGY, 36 (4):494-503; 10.1080/1064119X.2017.1340375 2018
Language: English
Abstract: This study focuses on the evaluation on deformation induced by periodic saturation of a sandstone-mudstone particle mixture. Two types of triaxial tests, without and with periodic saturation, were performed. The strain-stress relationships from the two types of tests indicate that the periodic saturation may induce an increment of axial strain (epsilon), and the epsilon values are related to the ratio of confining to atmospheric pressure (sigma(3)/p(a)), stress level for periodic saturation (L), and number of periodic saturation or cycles (N). The values of epsilon are increasing along logarithmic curves with increment of N value from 1 to 20, and increase along straight lines with increasing L value from 0.18 to 0.82 or sigma(3)/p(a) value from 1 to 4. Based on the analyses of experimental data, a logarithmic fitting equation, which is a function of N, L, and sigma(3)/p(a), is suggested to predict the epsilon value. And based on the fitting equation and simple analyses on stress state, another equation, which may be used to estimate the settlement induced by periodic saturation of a large-area foundation filled using the sandstone-mudstone particle mixture, is also suggested.
ISSN: 1064-119X
eISSN: 1521-0618
IDS Number: GA8JU
Unique ID: WOS:000428587200011
二、EI 8条
1. TMD design for seismic vibration control of high-pier bridges in Sichuan–Tibet Railway and its influence on running trains
Accession number: 20181504990620
Authors: Chen, Zhaowei (1, 2); Han, Zhaoling (2); Zhai, Wanming (2); Yang, Jizhong (3)
Author affiliation: (1) School of Mechanotronics and Vehicle Engineering, Chongqing Jiaotong University, Chongqing, People’s Republic of China; (2) State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu, People’s Republic of China; (3) China Railway Eryuan Engineering Group Co. Ltd., Chengdu, People’s Republic of China
Corresponding author: Chen, Zhaowei(chenzhaowei@my.swjtu.edu.cn)
Source title: Vehicle System Dynamics
Abbreviated source title: Veh Syst Dyn
Issue date: April 5, 2018
Publication year: 2018
Pages: 1-19
Language: English
ISSN: 00423114
E-ISSN: 17445159
CODEN: VSDYA4
Document type: Article in Press
Publisher: Taylor and Francis Ltd.
Abstract: Sichuan–Tibet Railway plays a vital role in China’s transportation system by connecting Tibet and Central China, whose design and construction are extremely difficult due to numerous seismic zones and deep valleys along the railway line. This paper systematically presents a framework to control seismic vibration of T-beam bridges with high-piers in Sichuan–Tibet Railway using tuned mass dampers (TMDs). Firstly, a finite element model of the widely used high-pier bridge is established to reveal its vibration modes subject to earthquakes. On this basis, optimal installation locations and optimal parameters of the TMDs are determined. Then, vibration reduction effects of the designed TMDs on the high-pier bridge subject to actual earthquake samples are investigated and compared with that of using some other vibration absorption measures. Finally, a detailed train-track-bridge dynamic model with attached TMDs is established to study the effects of the designed TMDs on the seismic responses of the running trains. The results indicate that, for the high-pier T-beam bridges, the first bending vibration mode of the high-pier is most likely to be excited by earthquakes, which should be restrained. With the designed optimal parameters, the attached TMDs are effective to control seismic vibrations of the concerned high-pier bridges. Tuned mass damper is the best one among all the investigated measures to absorb vibrations subject to earthquakes from the perspective of vibration absorption performance, installation and maintenance. ? 2018 Informa UK Limited, trading as Taylor & Francis Group
Main heading: Seismic design
Controlled terms: Acoustic devices - Composite bridges - Earthquakes - Finite element method - Piers - Railroad bridges - Railroads - Vibration control
Uncontrolled terms: Design and construction - High piers - Installation locations - Seismic effect - Sichuan - Transportation system - Vibration reduction effects - Vibration reductions
Classification code: 401.1 Bridges
Bridges
- 407.1 Maritime Structures
Maritime Structures
- 408 Structural Design
Structural Design
- 484 Seismology
Seismology
- 731.3 Specific Variables Control
Specific Variables Control
- 752.1 Acoustic Devices
Acoustic Devices
- 921.6 Numerical Methods
Numerical Methods
DOI: 10.1080/00423114.2018.1457793
Database: Compendex
Compilation and indexing terms, Copyright 2018 Elsevier Inc.
Data Provider: Engineering Village
2. Study on damage identification of beam bridge based on characteristic curvature and improved wavelet threshold De-Noising algorithm
Accession number: 20181404975485
Authors: Chu, Xi (1); Zhou, Zhixiang (1); Deng, Guojun (1); Jiang, Tengjiao (1); Lei, Yangkun (1)
Author affiliation: (1) Dept. of State Key Laboratory Breeding Base of Mountain Bridge Tunnel Engineering, Chongqing Jiaotong University, Chongqing; 400074, China
Corresponding author: Chu, Xi(jfnchuxi@yahoo.com)
Source title: Advances in Modelling and Analysis B
Abbreviated source title: Adv Model Anal B
Volume: 60
Issue: 2
Issue date: 2017
Publication year: 2017
Pages: 505-524
Language: English
ISSN: 12404543
CODEN: AABPEM
Document type: Journal article (JA)
Publisher: AMSE Press, 16 Avenue Grauge Blanche, Tassin-la-Demi-Lune, 69160, France
Abstract: With the point cloud data of box girder obtained by the theory of structure from motion (SFM) algorithm chosen as the research background, a damage identification method based on characteristic curvature and improved wavelet threshold de-noising algorithm is presented. Firstly, the static load test is carried out for the full-scale box girder model, and after the cracking damage, the discrete point cloud data on the surface of the box girder are obtained through the SFM theory. According to the basic hypothesis, deformation is mainly caused by the bending moment, and micro damage has no effect on stress redistribution. Therefore, a conclusion can be made that the curvature is sensitive to the structural damage. Then, a characteristic curvature damage identification method, which is based on point cloud chord length, is used to solve the characteristic curvature of the specified section of the box girder. It is found that there are a large number of point cloud noise signals in the characteristic curvature, and on this basis, a new wavelet de-noising method established upon the threshold function is proposed. Finally, the damage index revealed from the characteristic curvature after de-noising in the specified section is compared with the actual damage location of the box girder. The results show that by combining the characteristic curvature algorithm based on the chord length of scattered point cloud with the improved wavelet threshold de-noising function, the structural surface crack damage based on spatial point cloud data can be identified. Especially, in consideration of noise interference, the improved wavelet threshold de-noising function proposed in this paper can effectively suppress the high frequency noise signal in the characteristic curvature and preserve the low-frequency signal of damage in the damage area. Thus, the accuracy and sensitivity of the damage identification method based on the characteristic curvature are guaranteed. This method has the potential to be applied to structural health monitoring, since it can provide a new technical method for the early warning of the beam structure bridge.
Number of references: 21
Main heading: Damage detection
Controlled terms: Box girder bridges - Cracks - Load testing - Structural analysis - Structural health monitoring - Surface defects
Uncontrolled terms: Damage Identification - Feature curvature - Scattered point clouds - Stress redistribution - Structure from motion algorithm - Threshold functions - Wavelet denoising - Wavelet threshold de-noising
Classification code: 401.1 Bridges
Bridges
- 408.1 Structural Design, General
Structural Design, General
- 422 Strength of Building Materials; Test Equipment and Methods
Strength of Building Materials; Test Equipment and Methods
- 951 Materials Science
Materials Science
Funding Details: Number; Acronym; Sponsor: 51708068; NSFC; National Natural Science Foundation of China - Number; Acronym; Sponsor: 51778094; NSFC; National Natural Science Foundation of China
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2018 Elsevier Inc.
Data Provider: Engineering Village
3. NSGA-II multi-objectives optimization algorithm for energy management control of hybrid electric vehicle
Accession number: 20181504997717
Authors: Deng, Tao (1); Lin, Chunsong (1); Luo, Junlin (1); Chen, Bingqu (1)
Author affiliation: (1) School of Mechatronics and Vehicle Engineering, Chongqing Jiaotong University, China
Corresponding author: Deng, Tao(d82t722@163.com)
Source title: Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering
Abbreviated source title: Proc. Inst. Mech. Eng. Part D J. Automob. Eng.
Issue date: January 1, 2018
Publication year: 2018
Language: English
ISSN: 09544070
CODEN: PMDEEA
Document type: Article in Press
Publisher: SAGE Publications Ltd
Abstract: The currently existing energy management control optimization for hybrid electric vehicle (HEV) mainly focuses on fuel economy. Apart from this, there has been some consideration of the impact of emissions, but almost no attention has been paid to drivability performance. Therefore, from the point of view of multi-objectives optimization, the influences of fuel economy, emission and drivability performance on the energy management are comprehensively considered for a parallel HEV. The energy management control parameters and driveline parameters are selected to be optimized parameters. Then, the NSGA-II (Fast Non-dominated Sorting Genetic Algorithm-II) algorithm is proposed to solve the multi-objectives optimization problem. Furthermore, the multi-objectives optimization method for HEV energy management control is established and comparatively simulated with the parallel electric assist control strategy. The results show that the evaluation index of drivability decreases by 27.12% from the maximum and the average enhancement effect of optimization falls by 20.84%. The evaluation index of fuel economy declines by 22.30% from the maximum and the average index drops by 20.26%. The comprehensive index of emission performance descends by 11.33% from the maximum. The proposed multi-objectives optimization algorithm has good convergence and distribution, and obtains more Pareto optimal solution sets, which can provide more selectivity in building HEV energy management control strategies. ? 2018, IMechE 2018.
Main heading: Hybrid vehicles
Controlled terms: Electric machine control - Energy management - Fuel economy - Fuels - Genetic algorithms - Industrial management - Pareto principle
Uncontrolled terms: Energy management control strategies - Energy management controls - Hybrid electric vehicle (HEV) - Multi-objectives optimization - Non-dominated sorting genetic algorithm - ii - NSGA-II - Pareto - Pareto optimal solutions
Classification code: 432 Highway Transportation
Highway Transportation
- 525 Energy Management and Conversion
Energy Management and Conversion
- 525.2 Energy Conservation
Energy Conservation
- 731.2 Control System Applications
Control System Applications
- 912.2 Management
Management
Numerical data indexing: Percentage 1.13e+01%, Percentage 2.03e+01%, Percentage 2.08e+01%, Percentage 2.23e+01%, Percentage 2.71e+01%
DOI: 10.1177/0954407017753446
Database: Compendex
Compilation and indexing terms, Copyright 2018 Elsevier Inc.
Data Provider: Engineering Village
4. Analysis of influencing factors on transient temperature field of wet clutch friction plate used in marine gearbox
Accession number: 20181505005877
Authors: Lin, Tengjiao (1); Tan, Zi-ran (1); He, Ze-yin (2); Cao, Hong (1); Lv, He-sheng (3)
Author affiliation: (1) State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing, China; (2) School of Mechatronics and Vehicle Engineering, Chongqing Jiaotong University, Chongqing, China; (3) CN Gpower Gearbox Co., Chongqing, China
Corresponding author: Lin, Tengjiao(tjlin1968@126.com)
Source title: Industrial Lubrication and Tribology
Abbreviated source title: Ind Lubr Tribol
Volume: 70
Issue: 2
Issue date: 2018
Publication year: 2018
Pages: 241-249
Language: English
ISSN: 00368792
CODEN: ILTRA7
Document type: Journal article (JA)
Publisher: Emerald Group Publishing Ltd., Howard House, Wagon Lane, Bingley, BD16 1WA, United Kingdom
Abstract: Purpose: This paper aims to introduce the moment of inertia of the driving and driven end of the clutch into the analysis of the transient temperature field of a friction plate and studied the influencing factors on that, especially to a marine gearbox. Design/methodology/approach: A three-dimensional transient heat transfer analysis model of a wet clutch friction plate used in a marine gearbox is developed, and the transient characteristics of the temperature field during engagement are analyzed with taking account of the influence factors such as the sliding friction coefficient, engaging revolving speed, moment of inertia and applied engagement pressure. Findings: The paper found out that the hot spot appears on the surface of the friction plate, taking account of the effect of radial slots and spiral groove. To avoid damage to the friction plate as a result of overheating, the appropriate sliding friction coefficient, lower engaging revolving speed and reasonable selection of applied engagement pressure curve can ensure a favorable heating situation of the friction plate. The reasonable structural design for the clutch with a bigger moment of inertia of driving end and smaller moment of inertia of driven end can reduce the engaging time effectively and decrease the peak temperature of the friction plate. Originality/value: This paper fulfils a method to study the transient temperature field of a wet clutch friction plate, especially used in a marine gearbox. ? 2018, Emerald Publishing Limited.
Number of references: 22
Main heading: Clutches
Controlled terms: Factor analysis - Finite element method - Friction - Gears - Heat transfer - Plates (structural components) - Structural design - Temperature - Tribology
Uncontrolled terms: Design/methodology/approach - Influence factors - Marine gearbox - Sliding friction coefficient - Transient characteristic - Transient heat transfer - Transient temperature fields - Wet Clutches
Classification code: 408.1 Structural Design, General
Structural Design, General
- 408.2 Structural Members and Shapes
Structural Members and Shapes
- 601.2 Machine Components
Machine Components
- 602.2 Mechanical Transmissions
Mechanical Transmissions
- 641.1 Thermodynamics
Thermodynamics
- 641.2 Heat Transfer
Heat Transfer
- 921.6 Numerical Methods
Numerical Methods
- 922.2 Mathematical Statistics
Mathematical Statistics
- 931 Classical Physics; Quantum Theory; Relativity
Classical Physics; Quantum Theory; Relativity
DOI: 10.1108/ILT-08-2016-0181
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2018 Elsevier Inc.
Data Provider: Engineering Village
5. Experimental Research on Fatigue Damage of Reinforced Concrete Rectangular Beam
Accession number: 20181504997687
Authors: Liu, Fangping (1); Zhou, Jianting (2)
Author affiliation: (1) Chongqing Three Gorges University, Chongqing; 404100, China; (2) Chongqing Jiaotong University, Chongqing; 400074, China
Corresponding author: Zhou, Jianting(jtzhou@cqjtu.edu.cn)
Source title: KSCE Journal of Civil Engineering
Abbreviated source title: KSCE J. Civ. Eng.
Issue date: April 2, 2018
Publication year: 2018
Pages: 1-12
Language: English
ISSN: 12267988
E-ISSN: 19763808
Document type: Article in Press
Publisher: Springer Verlag
Abstract: In order to acquire the law of the fatigue damage development of reinforced concrete rectangular beams, the ultimate load carrying capacity of a tested beam was measured through the static loading test. The carrying capacity of the beam was then taken as the basis of loading amplitudes for the fatigue tests and the constant amplitude fatigue loading tests under different load levels were carried out for another three beams. The experimental results show that the crack in the beam is composed of the oblique crack in the bending shear section and the vertical crack in the pure bending section. The fatigue cracks are symmetrically distributed along the length direction, and the two sides are basically the same. The fatigue fracture of the test beam occurs in one main cracks located in the middle section of the span. According to the crack width, height and the number of cracks, the whole fatigue test process can be roughly divided into three stages, that is, the rapid development stage, the stable stage and the failure stage. The development of the deflection of the beam and the strain increment of the steel bar and the concrete increased significantly at the beginning of the fatigue cycle; with the increase of cycle number of fatigue load, the growth rate slowed down and entered a relatively stable stage of development; as fatigue destruction gets nearer, the speed became great again. The stiffness of the beam has a relatively large decrease at the beginning of the fatigue loading. In the middle of a longer period of time, it is basically in a linear decline phase. Before the failure, the stiffness decreases greatly. Overall, the stiffness degradation of the beam shows a more obvious monotonic decreasing “S” curve. In a word, many aspects reflect that the fatigue damage of reinforced concrete rectangular beam has obvious three stages damage law. In the early and later stages of fatigue test, the damage is developing rapidly; and in the intermediate stage of fatigue test, the damage development is relatively stable. ? 2018 Korean Society of Civil Engineers
Main heading: Fatigue damage
Controlled terms: Bridges - Cracks - Fatigue testing - Load limits - Reinforced concrete - Stiffness
Uncontrolled terms: Bridge engineering - Constant-amplitude fatigue loadings - damage law - Experimental research - Rectangular beams - Static loading test - Stiffness degradation - Ultimate load-carrying capacity
Classification code: 401.1 Bridges
Bridges
- 408.1 Structural Design, General
Structural Design, General
- 412 Concrete
Concrete
- 951 Materials Science
Materials Science
DOI: 10.1007/s12205-018-1767-y
Database: Compendex
Compilation and indexing terms, Copyright 2018 Elsevier Inc.
Data Provider: Engineering Village
6. Boundedness and global robust stability analysis of delayed complex-valued neural networks with interval parameter uncertainties
Accession number: 20181504993675
Authors: Song, Qiankun (1); Yu, Qinqin (2); Zhao, Zhenjiang (3); Liu, Yurong (4, 5); Alsaadi, Fuad E. (5)
Author affiliation: (1) Department of Mathematics, Chongqing Jiaotong University, Chongqing; 400074, China; (2) School of Economic and Management, Chongqing Jiaotong University, Chongqing; 400074, China; (3) Department of Mathematics, Huzhou University, Huzhou; 313000, China; (4) Department of Mathematics, Yangzhou University, Yangzhou; 225002, China; (5) Communication Systems and Networks (CSN) Research Group, Faculty of Engineering, King Abdulaziz University, Jeddah; 21589, Saudi Arabia
Corresponding author: Song, Qiankun(qiankunsong@163.com)
Source title: Neural Networks
Abbreviated source title: Neural Netw.
Volume: 103
Issue date: July 2018
Publication year: 2018
Pages: 55-62
Language: English
ISSN: 08936080
E-ISSN: 18792782
CODEN: NNETEB
Document type: Journal article (JA)
Publisher: Elsevier Ltd
Abstract: In this paper, the boundedness and robust stability for a class of delayed complex-valued neural networks with interval parameter uncertainties are investigated. By using Homomorphic mapping theorem, Lyapunov method and inequality techniques, sufficient condition to guarantee the boundedness of networks and the existence, uniqueness and global robust stability of equilibrium point is derived for the considered uncertain neural networks. The obtained robust stability criterion is expressed in complex-valued LMI, which can be calculated numerically using YALMIP with solver of SDPT3 in MATLAB. An example with simulations is supplied to show the applicability and advantages of the acquired result. ? 2018 Elsevier Ltd
Number of references: 45
Main heading: Complex networks
Controlled terms: Lyapunov methods - MATLAB - Stability criteria - Uncertainty analysis
Uncontrolled terms: Complex-valued neural networks - Delays - Equilibrium point - Interval parameter - Robust stability
Classification code: 722 Computer Systems and Equipment
Computer Systems and Equipment
- 921 Mathematics
Mathematics
- 922.1 Probability Theory
Probability Theory
- 961 Systems Science
Systems Science
DOI: 10.1016/j.neunet.2018.03.008
Funding Details: Number; Acronym; Sponsor: 61473332; NSFC; National Natural Science Foundation of China - Number; Acronym; Sponsor: 61773004; NSFC; National Natural Science Foundation of China
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2018 Elsevier Inc.
Data Provider: Engineering Village
7. Effects of Knocking Frequency for Al Coatings on GDP Microsphere
Accession number: 20181504989586
Authors: Sun, Shu-Bing (1, 2); He, Zhi-Bing (2); He, Xiao-Shan (2); Li, Li (1, 3); Wang, Feng (1, 3); Liu, Yan-Song (2)
Author affiliation: (1) College of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing; 400074, China; (2) Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang; Sichuan; 621900, China; (3) National and Local Joint Engineering Laboratory of Traffic Civil Engineering Materials, Chongqing Jiaotong University, Chongqing; 400074, China
Corresponding author: Liu, Yan-Song(jdliuyansong@163.com)
Source title: Zhongguo Biaomian Gongcheng/China Surface Engineering
Abbreviated source title: Zhongguo Biaomian Gongcheng/China Surf. Eng.
Volume: 30
Issue: 6
Issue date: December 1, 2017
Publication year: 2017
Pages: 50-58
Language: Chinese
ISSN: 10079289
Document type: Journal article (JA)
Publisher: Chinese Mechanical Engineering Society
Abstract: In inertial confinement fusion, metal coating can be used as a protective layer on hollow microspheres, which plays an important role in improving the performance of the target. The aluminum coating was deposited on the glow discharge polymer microsphere by magnetron sputtering technique. Rotation and knocking were utilized to make microspheres bounce randomly. The effects of changing the length of striking interval on the quality of the aluminum coating was investigated. Xray camera, white light interferometer, SEM and XRD were utilized to characterize the coating. The results show that the thickness of the aluminum coatings on the hollow microsphere surface is about (2±0.1) μm. The coatings’ surface is smooth and free of cracks, with a roughness below 75 nm. The coatings are found with a columnar crystal structure and preferentially orienting at the (111) crystal face. The repeatability of the experiments is demonstrated to be good. It is found that knocking can effectively improve the shadowing effect in the process of coating growth. The wall thickness uniformity increases and the surface roughness is affected. When the striking interval is 15 s, the comprehensive quality of the microsphere aluminum coating is the best with the wall thickness uniformity up to 93.5%, the surface roughness of 30.43 nm, and the grain size of the preferred crystal face of 13.66 nm, respectively. ? 2017, Editorial Office of CHINA SURFACE ENGINEERING. All right reserved.
Number of references: 33
Main heading: Aluminum coatings
Controlled terms: Borophosphate glass - Crystal structure - Glow discharges - Microspheres - Protective coatings - Surface roughness
Uncontrolled terms: Columnar crystal structures - Comprehensive qualities - Driving mode - Glow discharge polymers - Hollow microsphere - Length of knocking interval - Protective layers - White-light interferometer
Classification code: 701.1 Electricity: Basic Concepts and Phenomena
Electricity: Basic Concepts and Phenomena
- 812.3 Glass
Glass
- 813.2 Coating Materials
Coating Materials
- 931.2 Physical Properties of Gases, Liquids and Solids
Physical Properties of Gases, Liquids and Solids
- 933.1.1 Crystal Lattice
Crystal Lattice
Numerical data indexing: Percentage 9.35e+01%, Size 1.37e-08m, Size 3.04e-08m, Size 7.50e-08m, Time 1.50e+01s
DOI: 10.11933/j.issn.1007-9289.20170523002
Funding Details: Number; Acronym; Sponsor: 51401194; NSFC; National Natural Science Foundation of China
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2018 Elsevier Inc.
Data Provider: Engineering Village
8. On improving the local cubic lawfor fracture flow modeling by keeping impacts of fluid inertia and irregular boundaries
Accession number: 20181504990721
Authors: Yu, Cheng (1)
Author affiliation: (1) Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education, Chongqing Jiaotong University, 66 Xuefu Road, Nan’an District, Chongqing; 400074, China
Corresponding author: Yu, Cheng
Source title: Journal of Porous Media
Abbreviated source title: J Porous Media
Volume: 21
Issue: 1
Issue date: 2018
Publication year: 2018
Pages: 51-64
Language: English
ISSN: 1091028X
E-ISSN: 19340508
CODEN: JPMEFB
Document type: Journal article (JA)
Publisher: Begell House Inc.
Abstract: Local cubic law (LCL) has been widely used for fracture flow modeling; however, its reliability is still subject to debate. In this paper the basic assumptions of LCL were revisited to take into account the impacts of variable boundaries and inertial forces. The vertical distributions and magnitudes of the flow velocities through variable apertures were improved by solving a semiempirically simplified nonlinear Navier-Stokes (N-S) equation. Nonlinear relationships were established between pressure gradients and local flow rates based on these solutions of velocities, and these relationships were regarded as conductivities for the revised LCL models. The following improvements are achieved: (1) the impacts of variable geometries and inertial forces were retained to accommodate the nonlinearity of N-S flow; (2) variations of both the vertical and horizontal velocities were taken into account. The revised LCL models were validated by analytical solutions of transmissivities through sinusoidally walled channels. Results suggest that these revised LCL models show significant improvement. The revised LCL models can also provide a more accurate prediction of pressure distributions, with a good representation of the nonlinearity of N-S flow as well. Meanwhile, the revised LCL model still keeps the advantage of the original LCL method for the convenience in boundary condition treatment. ? 2018 by Begell House, Inc.
Number of references: 32
Main heading: Navier Stokes equations
Controlled terms: Control nonlinearities - Flow control - Fracture - Nonlinear equations
Uncontrolled terms: Accurate prediction - Boundary condition treatments - Cubic laws - Fracture flow - Inertial forces - Non-linear relationships - Variable geometry - Vertical distributions
Classification code: 731.1 Control Systems
Control Systems
- 731.3 Specific Variables Control
Specific Variables Control
- 921.2 Calculus
Calculus
- 951 Materials Science
Materials Science
DOI: 10.1615/JPorMedia.v21.i1.30
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2018 Elsevier Inc.
Data Provider: Engineering Village
三、ISTP1条
*Record 1 of 1. Search terms matched: CHONGQING JIAOTONG(2)
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Title: Fuzzy Comprehensive Evaluation for PBL Education Quality of Undergraduate Engineering Practice
Authors: Xu, XY; Cao, YW; Dong, SJ
Author Full Names: Xu, Xiang-yang; Cao, Yuan-wen; Dong, Shao-jiang
Book Group Author(s): Destech Publicat Inc
Source: INTERNATIONAL CONFERENCE ON EDUCATION INNOVATION AND ECONOMIC MANAGEMENT (EIEM 2017), 33-37; 2017
Book Series: DEStech Transactions on Social Science Education and Human Science
Language: English
Abstract: The comprehensive PBL education quality evaluation of university engineering practice is a practical requirement to change the view of engineering education quality, establish the operational evaluation system and promote the reform of engineering innovative talents cultivation. Taking the problem as the guidance, from evaluation factors of PBL education quality of engineering practice, and based on the fuzzy mathematics theory, constructing the fuzzy evaluation models of practice object, practice content, practice input, practice process, practice effects, accessibility improvement and portability, forming a PBL education quality dynamical evaluation system of practice background, input, process, and results of engineering practice. In addition, a specific PBL education quality evaluation case is discussed by using this fuzzy evaluation method.
ISSN: 2475-0042
ISBN: 978-1-60595-495-0
IDS Number: BJ8SO
Unique ID: WOS:000428761200008
