一、SCI 5条
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Title: Multi-objective trade-off optimal control of energy management for hybrid system
Authors: Deng, T; Tang, P; Lin, CS; Li, X
Author Full Names: Deng, T.; Tang, P.; Lin, CH. S.; Li, X.
Source: JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING, 40 (4):10.1007/s40430-018-1146-0 APR 2018
Language: English
Abstract: Currently, energy management control mainly focuses on single-objective optimization (SOO). Even if multi-objective optimization (MOO) problem is studied, it is often converted into an SOO problem by using the weighted sum method. Obviously, it cannot really reflect the essential strengths of MOO. In this paper, a parallel hybrid electric vehicle is taken as the research object. The fuel economy, emissions, and drivability performance are taken as optimization objectives. The parameters of energy management and driveline system are optimized. Considering the constraint conditions of the dynamic performance and charge balance, the fast non-dominated sorting differential evolution algorithm (NSDEA) is proposed to solve the multi-objective optimization problem. Then multi-group sets of Pareto solutions with good distribution and convergence are obtained. The simulation results of NSDEA show that the fuel economy is increased by 20.26% on average. The emissions evaluation index is optimized by 11.33% on average, and the maximum carbon monoxide (CO) optimization value reaches 21.9%. The average of drivability evaluation index (jerk) is up to 20.84%, and 40.32% for maximum. Obviously, the above obtained results are discrete points. They only represent some optimal solutions. Based on the above sets, the locally weighted scatter plot smoothing method is used to fit continuous curve and surfaces. Then, the multi-objective Pareto trade-off optimal control surface is established to further obtain the optimal solutions. This study can provide more reference for the optimal control strategy and lay a foundation for multi-objective energy management of the actual vehicle.
ISSN: 1678-5878
eISSN: 1806-3691
Article Number: UNSP 220
IDS Number: GD1DD
Unique ID: WOS:000430239300059
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Title: Hydrologic performance of bioretention in an expressway service area
Authors: Gao, JP; Pan, JK; Hu, N; Xie, CZ
Author Full Names: Gao, Jianping; Pan, Junkui; Hu, Ning; Xie, Chengzuo
Source: WATER SCIENCE AND TECHNOLOGY, 77 (7):1829-1837; 10.2166/wst.2018.048 APR 2018
Language: English
Abstract: Bioretention can be an effective measure for stormwater treatment. However, there is a lack of systematic analysis of the impact of bioretention design parameters on hydrologic performance. Herein, SWMM and RECARGA models were applied to generate the typical annual rainfall runoff and simulate the water balance of the bioretention system in an expressway service area. The purpose of the investigation was to identify key design parameters for the bioretention system and delineate the priorities in developing the design. Results showed that the average groundwater recharge ratios for bioretention basins with and without an underdrain were 58.29% and 92.27%, respectively, the average overflow ratios were 4.13% and 4.19%, the average evapotranspiration ratios were 4.48% and 4.47%, and the average outflow ratio for bioretention with an underdrain was 33.94%. The ratio of the bioretention area to drainage area, and the saturated infiltration rates of planting soil and native soil were the main factors influencing water balance, while the underdrain diameter and gravel layer depth exerted little effect. Based on the impact analysis, multivariate nonlinear regression models of runoff reduction rate for two types of bioretention basin were established, which both exhibited high determination coefficients and acceptable Nash-Sutcliffe coefficients.
ISSN: 0273-1223
eISSN: 1996-9732
IDS Number: GD4PZ
Unique ID: WOS:000430486400007
PubMed ID: 29676740
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Title: Vehicle trajectory at curved sections of two-lane mountain roads: a field study under natural driving conditions
Authors: Xu, J; Luo, X; Shao, YM
Author Full Names: Xu, Jin; Luo, Xiao; Shao, Yi-Ming
Source: EUROPEAN TRANSPORT RESEARCH REVIEW, 10 (1):10.1007/s12544-018-0284-x MAR 2018
Language: English
Abstract: Purpose The trajectory of a vehicle is comprehensively affected by the interactions between the vehicle, the driving behavior, and the road environment. High-risk driving behaviors and accident-prone road sections can be identified based on the relationship between the trajectory and road geometry. Previous related studies mostly focused on the trajectory deviation at a few points on the road, which cannot capture the continuous variation of the trajectory in an entire curve, and seldom considered the trajectory characteristics along curves with large deflection angles. The aim of this study is to investigate the trajectories passenger cars take on two-lane mountain roads and thus to determine the track patterns and its relevant risks. Methods Field driving experiments were performed on four two-lane mountain highways, and vehicle trajectories under natural driving conditions were acquired. The continuous change in the lateral deviation rate of the trajectory was also determined by putting the measured trajectories into the coordinate frame together with the edge line of roadway. Further, the morphological features of the vehicle trajectory and how it is affected by the highway geometry were analyzed. Results and conclusions The following were observed: i) Typical track patterns were determined according to features of LDRT profiles, four patterns for left-hand bends and five patterns for right-hand bends, which can be used to identify crash prone position and reveal the mechanism of crash. ii) Inertia may cause the vehicle to move too close to the outer side of the curve after a cut, for which reason the driver has to correct the trajectory, although overcorrection may move the vehicle into the oncoming lane. iii) A higher speed at curve entry adopt by the driver could result in a larger encroachment into opposite lane or shoulder. iv) The smaller the radius of the horizontal curve, the more frequently the trajectory entered the oncoming lane. These findings could provide a better understanding of the track behavior of passenger cars, judge the safety implications of driver behavior, and thus identify crash prone positioning and the potential mechanisms of head-on crashes, run-off-road and guardrail collisions.
ISSN: 1867-0717
eISSN: 1866-8887
Article Number: 12
IDS Number: GC8QR
Unique ID: WOS:000430061500013
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Title: Analysis of influencing factors on transient temperature field of wet clutch friction plate used in marine gearbox
Authors: Lin, TJ; Tan, ZR; He, ZY; Cao, H; Lv, HS
Author Full Names: Lin, Tengjiao; Tan, Zi-ran; He, Ze-yin; Cao, Hong; Lv, He-sheng
Source: INDUSTRIAL LUBRICATION AND TRIBOLOGY, 70 (2):241-249; 10.1108/ILT-08-2016-0181 2018
Language: English
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.
ISSN: 0036-8792
eISSN: 1758-5775
IDS Number: GC9TD
Unique ID: WOS:000430140800001
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Title: Numerical and Experimental Identification of Seven-Wire Strand Tensions Using Scale Energy Entropy Spectra of Ultrasonic Guided Waves
Authors: Qian, J; Chen, X; Sun, LM; Yao, GW; Wang, X
Author Full Names: Qian, Ji; Chen, Xin; Sun, Limin; Yao, Guowen; Wang, Xu
Source: SHOCK AND VIBRATION, 10.1155/2018/6905073 2018
Language: English
Abstract: Accurate identification of tension in multiwire strands is a key issue to ensure structural safety and durability of prestressed concrete structures, cable-stayed bridges, and hoist elevators. This paper proposes a method to identify strand tensions based on scale energy entropy spectra of ultrasonic guided waves (UGWs). A numerical method was first developed to simulate UGW propagation in a seven-wire strand, employing the wavelet transform to extract UGW time-frequency energy distributions for different loadings. Mode separation and frequency band loss of L(0, 1) were then found for increasing tension, and UGW scale energy entropy spectra were extracted to establish a tension identification index. A good linear relationship was found between the proposed identification index and tensile force, and effects of propagation distance and propagation path were analyzed. Finally, UGWs propagation was examined experimentally for a long seven-wire strand to investigate attenuation and long distance propagation. Numerical and experimental results verified that the proposed method not only can effectively identify strand tensions but can also adapt to long distance tests for practical engineering.
ISSN: 1070-9622
eISSN: 1875-9203
Article Number: 6905073
IDS Number: GD0XG
Unique ID: WOS:000430223800001
二、EI10条
1. Optimal management and simulation of harbor resources given uncertain conditions and low carbonization
Accession number: 20181605023718
Authors: Bao, Xuexin (1); Zhang, Dan (1)
Author affiliation: (1) Department of Navigation, Chongqing Jiaotong University, Chongqing; 400074, China
Corresponding author: Bao, Xuexin(mercuryb@qq.com)
Source title: Modelling, Measurement and Control C
Abbreviated source title: Modell Meas Control C
Volume: 78
Issue: 2
Issue date: June 2017
Publication year: 2017
Pages: 149-164
Language: English
ISSN: 12595977
CODEN: MMCPE5
Document type: Journal article (JA)
Publisher: AMSE Press, 16 Avenue Grauge Blanche, Tassin-la-Demi-Lune, 69160, France
Abstract: This paper proposes a multi-objective optimization model for collocation of shoreline resources under uncertain conditions. By incorporating carbon emissions and TCO (Total Cost of Ownership), an optimization scheme for shoreline resources in its operation period is further defined here. The proposed simulation model can effectively measure the service indicator and operation mode at the harbor. The results from correlational studies show that since the lowcarbonization retrofit at the harbor, the environmental benefit around the harbor has been greatly improved, and the production cost has also been reduced significantly. A simulation algorithm is proposed here for low-carbonization retrofit of the yard crane, which implements relevant reconstruction strategies for yard crane at different service ages. Besides, a kind of lowcarbonization retrofit strategy, which does not affect the normal operation of harbor, is also developed for single facility. A dynamic programming model in question is constructed to effectively reduce the overall carbon emissions at the harbor, thus achieving a good effect on harbor multi-objective optimization. If the limit of funds is not tight, the revamping workloads of facilities in the harbor will be greatly increased. The service indicator in the harbor can be pushed to the limit of low carbonization retrofits. The verification results from project instances show that the simulation model proposed in this paper features high precision and is superior to others. ? 2017 AMSE Press. All rights reserved.
Number of references: 25
Main heading: Multiobjective optimization
Controlled terms: Carbon - Carbonization - Cranes - Dynamic programming - Retrofitting - Ship cranes
Uncontrolled terms: Collocation of shoreline resources - Dynamic programming model - Environmental benefits - Lowcarbonization - Multi-objective optimization models - Simulation - Total cost of ownership - Uncertainty
Classification code: 693.1 Cranes
Cranes
- 802.2 Chemical Reactions
Chemical Reactions
- 804 Chemical Products Generally
Chemical Products Generally
- 913.5 Maintenance
Maintenance
- 921.5 Optimization Techniques
Optimization Techniques
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2018 Elsevier Inc.
Data Provider: Engineering Village
2. A Stress Measurement Method for Steel Strands Based on LC Oscillation
Accession number: 20181705111560
Authors: Chen, Dongjun (1, 2); Zhang, Benniu (1); Li, Xingxing (1); Tu, Chong (1); Yuan, Can (1); Li, Wenzhao (1); Zhou, Zhixiang (1); Liang, Zongbao (1)
Author affiliation: (1) Chongqing Jiaotong University, Chongqing; 400074, China; (2) CSCEC Xinjiang Construction and Engineering (Group) Co., Ltd., Urumchi; 830000, China
Corresponding author: Zhang, Benniu(benniuzhang@gmail.com)
Source title: Advances in Materials Science and Engineering
Abbreviated source title: Adv. Mater. Sci. Eng.
Volume: 2018
Issue date: 2018
Publication year: 2018
Article number: 1584903
Language: English
ISSN: 16878434
E-ISSN: 16878442
Document type: Journal article (JA)
Publisher: Hindawi Limited, 410 Park Avenue, 15th Floor, 287 pmb, New York, NY 10022, United States
Abstract: The prestress loss is one of the main factors affecting the safety of prestressed concrete structure. While the detecting signals like sound and light are difficult to spread in steel strands, there is no effective method for prestress detection of the bonded prestressed steel strands in existing structures yet. In this paper, taking into consideration that the electromagnetic oscillation characteristic can make the signal propagate effectively on the bonded prestressed steel strands, a nondestructive prestress detection method based on the electromagnetic effect to detect oscillation frequency is proposed. In a detection circuit, the steel strands are simulated as an inductance component, in which an induced electromagnetic signal passes through the steel strands to form resonance. And then, a frequency meter is used to detect the oscillation frequency of the resonant circuit. The oscillation frequency is supposed to have relationship with the prestress loading on the steel strands. A section of steel strands with a length of 1.2 m is adopted to test the correlation of stress and oscillation frequency. Both the theoretical and experimental results show that the resonant frequency of the circuit decreases with the increase of the stress of the strand and is linear in a certain range. ? 2018 Dongjun Chen et al.
Number of references: 19
Main heading: Resonant circuits
Controlled terms: Frequency meters - Natural frequencies - Prestressed concrete
Uncontrolled terms: Detection circuits - Detection methods - Electromagnetic oscillations - Electromagnetic signals - Existing structure - Non destructive - Oscillation frequency - Prestressed steel strand
Classification code: 412 Concrete
Concrete
- 942.1 Electric and Electronic Instruments
Electric and Electronic Instruments
Numerical data indexing: Size 1.20e+00m
DOI: 10.1155/2018/1584903
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2018 Elsevier Inc.
Data Provider: Engineering Village
3. Verification of the Kaiser effect in rocks under tensile stress: Experiment using the Brazilian test
Accession number: 20181705053575
Authors: Chen, Yulong (1); Irfan, Muhammad (2); Song, Chenpeng (3)
Author affiliation: (1) Dept. of Hydraulic Engineering, Tsinghua Univ, China; (2) Dept. of Civil Engineering, Univ. of Engineering and Technology, Lahore, Pakistan; (3) Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education, Chongqing Jiaotong Univ, China
Corresponding author: Song, Chenpeng(songchenpeng@163.com)
Source title: International Journal of Geomechanics
Abbreviated source title: Int. J. Geomech.
Volume: 18
Issue: 7
Issue date: July 1, 2018
Publication year: 2018
Article number: 04018001
Language: English
ISSN: 15323641
Document type: Journal article (JA)
Publisher: American Society of Civil Engineers (ASCE)
Abstract: Formany aspects of rock engineering, it is important to measure the in situ stresses, not only under compression but also under tension. Brazilian tests were performed to generate tensile stress in granite samples. The granite was obtained from the Beishan site, a potential high-level radioactive waste repository area in China. In this study, Brazilian testing was performed on the Beishan granite samples via cyclic loading, increasing themagnitude of the stress either every cycle or every other cycle. This allowed for assessment of the Kaiser effect method’s reliability in evaluating the tensile stress of a sample. The experimental results confirm the existence of the Kaiser effect in rocks under tensile stress. The Kaiser effect was obvious when the pre-existing stress was smaller than the crack damage stress and was ambiguous when the preexisting stress exceeded the crack damage stress, after which cracks began to propagate and coalesce in an unstable manner. The felicity ratio values associated with the stress and mechanical parameters consistently decreased with increasing pre-existing stress. ? 2018 American Society of Civil Engineers.
Number of references: 21
Main heading: Acoustic emission testing
Controlled terms: Cracks - Granite - Stress analysis - Tensile stress
Uncontrolled terms: Beishan granites - Brazilian test - Felicity effect - High level radioactive waste repositories - Kaiser effect - Mechanical parameters - Rock engineering - Tension
Classification code: 751.2 Acoustic Properties of Materials
Acoustic Properties of Materials
- 951 Materials Science
Materials Science
DOI: 10.1061/(ASCE)GM.1943-5622.0001181
Funding Details: Number; Acronym; Sponsor: 11572174; NSFC; National Natural Science Foundation of China - Number; Sponsor: 2017M620048; China Postdoctoral Science Foundation - Number; Acronym; Sponsor: 51279086; NSFC; National Natural Science Foundation of China - Number; Acronym; Sponsor: 51479097; NSFC; National Natural Science Foundation of China - Number; Acronym; Sponsor: 51604051; NSFC; National Natural Science Foundation of China
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2018 Elsevier Inc.
Data Provider: Engineering Village
4. Study on thermal management of rectangular Li-ion battery with serpentine-channel cold plate
Accession number: 20181705054245
Authors: Deng, Tao (1); Zhang, Guodong (1); Ran, Yan (1)
Author affiliation: (1) School of Mechatronics & Vehicle Engineering, Chongqing Jiaotong University, Chongqing; 400074, China
Corresponding author: Deng, Tao(d82t722@cqjtu.edu.cn)
Source title: International Journal of Heat and Mass Transfer
Abbreviated source title: Int. J. Heat Mass Transf.
Volume: 125
Issue date: October 2018
Publication year: 2018
Pages: 143-152
Language: English
ISSN: 00179310
CODEN: IJHMAK
Document type: Journal article (JA)
Publisher: Elsevier Ltd
Abstract: In order to investigate a simple and efficient liquid cooling method for the rectangular Li-ion power batteries used in electric vehicles, the cold plate with serpentine-channel configuration shaped like U-tube is established. Subsequently, the effect of cooling channel number, the layout of channels and inlet temperature of coolant on cooling performance of battery thermal management system are analyzed. The numerical simulation results demonstrate that the layout of channels in length flowing-direction with 5-channels has the most efficient cooling performance. This design can reduce the maximum temperature by 26 °C compared with the 2-channels along width flowing direction. And the maximum temperature of cooling system rises with the increase of inlet temperature of the coolant. However, there exists an upper limit on the number of channels and the inlet temperature with the consideration of efficiency and safety of cooling system. The above results will be helpful to design cold plate for thermal management system of Li-ion power batteries. ? 2018 Elsevier Ltd
Number of references: 33
Main heading: Lithium-ion batteries
Controlled terms: Automobile cooling systems - Battery management systems - Coolants - Cooling - Ions - Serpentine - Silicate minerals - Temperature control - Thermal management (electronics) - Thermoelectric equipment
Uncontrolled terms: Battery thermal managements - Channel layout - Cold plates - Li-ion power batteries - Maximum temperature
Classification code: 482.2 Minerals
Minerals
- 615.4 Thermoelectric Energy
Thermoelectric Energy
- 641.2 Heat Transfer
Heat Transfer
- 662.4 Automobile and Smaller Vehicle Components
Automobile and Smaller Vehicle Components
- 702.1.2 Secondary Batteries
Secondary Batteries
- 731.3 Specific Variables Control
Specific Variables Control
- 803 Chemical Agents and Basic Industrial Chemicals
Chemical Agents and Basic Industrial Chemicals
Numerical data indexing: Temperature 2.99e+02K
DOI: 10.1016/j.ijheatmasstransfer.2018.04.065
Funding Details: Number; Sponsor: 2014M552317; China Postdoctoral Science Foundation - Number; Acronym; Sponsor: 51305473; NSFC; National Natural Science Foundation of China
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2018 Elsevier Inc.
Data Provider: Engineering Village
5. Traffic Congestion Status Identification Method for Road Network with Multi-source Uncertain Information
Accession number: 20181705042210
Authors: Huang, Da-Rong (1); Chai, Yan-Chong (1); Zhao, Ling (1); Sun, Guo-Xi (2)
Author affiliation: (1) College of Information Science and Engineering, Chongqing Jiaotong University, Chongqing; 400074, China; (2) Guangdong Provincial Key Laboratory of Petrochemical Equipment Fault Diagnosis, Guangdong of Petrochemical Technology, Maoming; 525000, China
Corresponding author: Chai, Yan-Chong(chaiyanchong@163.com)
Source title: Zidonghua Xuebao/Acta Automatica Sinica
Abbreviated source title: Zidonghua Xuebao Acta Auto. Sin.
Volume: 44
Issue: 3
Issue date: March 1, 2018
Publication year: 2018
Pages: 533-544
Language: Chinese
ISSN: 02544156
CODEN: ZIXUDZ
Document type: Journal article (JA)
Publisher: Science Press
Abstract: Congestion identification is an important content of traffic condition assessment, and has significant meaning to the traffic regulation and management of transportation systems. With intelligent transport system (ITS) becoming increasingly popular, how to achieve congestion identification for uncertain multi-source information is a very important content under massive data. First, a new road network traffic congestion state characterization model is built based on multivariate set pair analysis method. Then, traffic information fusion is achieved by improving the Dempster combination rule of evidence method, and the accurate expression values of current traffic congestion are derived. Finally, the real time traffic monitoring data in Chongqing is used to verify the presented method. The results illustrate the presented method is effective, and that it is not only of theoretical significance but also of potential application value. Copyright ? 2018 Acta Automatica Sinica. All rights reserved.
Number of references: 25
Main heading: Traffic congestion
Controlled terms: Formal logic - Information fusion - Intelligent systems - Intelligent vehicle highway systems - Motor transportation - Roads and streets
Uncontrolled terms: Conflict coefficient - Congestion conditions - Dempster-shafer theory of evidence - Intelligent transport systems - Multi-source informations - Set pair analysis - State characterization - Uncertain informations
Classification code: 406.1 Highway Systems
Highway Systems
- 406.2 Roads and Streets
Roads and Streets
- 721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory
Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory
- 723.4 Artificial Intelligence
Artificial Intelligence
- 723.5 Computer Applications
Computer Applications
- 903.1 Information Sources and Analysis
Information Sources and Analysis
DOI: 10.16383/j.aas.2018.c160373
Funding Details: Number; Acronym; Sponsor: 61304104; NSFC; National Natural Science Foundation of China - Number; Acronym; Sponsor: 61573076; NSFC; National Natural Science Foundation of China - Number; Acronym; Sponsor: 61663008; NSFC; National Natural Science Foundation of China
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2018 Elsevier Inc.
Data Provider: Engineering Village
6. Application research of the laser and digital image processing in bridge monitoring
Accession number: 20181705058419
Authors: Lan, Zhang-Li (1); Chen, Wei (1); Liu, Fang (1); Yang, Yang (1)
Author affiliation: (1) School of Computer Science and Engineering, Chongqing Jiaotong University, Chongqing; 400074, China
Source title: ACM International Conference Proceeding Series
Abbreviated source title: ACM Int. Conf. Proc. Ser.
Volume: Part F135440
Part number: 1 of 1
Issue title: Proceedings of 2017 International Conference on Video and Image Processing, ICVIP 2017
Issue date: December 27, 2017
Publication year: 2017
Pages: 218-222
Language: English
ISBN-13: 9781450353830
Document type: Conference article (CA)
Conference name: 2017 International Conference on Video and Image Processing, ICVIP 2017
Conference date: December 27, 2017 - December 29, 2017
Conference location: Singapore, Singapore
Conference code: 135440
Sponsor: Nanyang Technological University
Publisher: Association for Computing Machinery
Abstract: Bridge is a key link in the traffic system, and many new methods have been studied to detect and monitorthe health of bridge, among which the method of bridge detection using the laser and laser image is a research hotpot. In this paper,the displacement measurement method of the deflection, cable support tower and anchor structure using the laser and image processing is studied, and the principle of the measurement iselaborated, among which the key algorithms are described. Successfully application in the practical bridge monitoring has testified that the methodcan meet the performanceneeds of the bridge structure above. ? 2017 Association for Computing Machinery.
Number of references: 20
Main heading: Image processing
Controlled terms: Cables - Video signal processing
Uncontrolled terms: Anchor structure - Bridge monitoring - Laser images - Support towers - The deflection displacement
Classification code: 716.4 Television Systems and Equipment
Television Systems and Equipment
DOI: 10.1145/3177404.3177443
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2018 Elsevier Inc.
Data Provider: Engineering Village
7. Approximate Optimality Conditions for Composite Convex Optimization Problems
Accession number: 20181705047101
Authors: Long, Xian-Jun (1); Sun, Xiang-Kai (1); Peng, Zai-Yun (2)
Author affiliation: (1) College of Mathematics and Statistics, Chongqing Technology and Business University, Chongqing; 400067, China; (2) College of Mathematics and Statistics, Chongqing JiaoTong University, Chongqing; 400074, China
Corresponding author: Long, Xian-Jun(xianjunlong@hotmail.com)
Source title: Journal of the Operations Research Society of China
Abbreviated source title: J. Oper. Res. Soc. China
Volume: 5
Issue: 4
Issue date: December 1, 2017
Publication year: 2017
Pages: 469-485
Language: English
ISSN: 2194668X
E-ISSN: 21946698
Document type: Journal article (JA)
Publisher: Springer Berlin Heidelberg
Abstract: The purpose of this paper is to study the approximate optimality condition for composite convex optimization problems with a cone-convex system in locally convex spaces, where all functions involved are not necessarily lower semi-continuous. By using the properties of the epigraph of conjugate functions, we introduce a new regularity condition and give its equivalent characterizations. Under this new regularity condition, we derive necessary and sufficient optimality conditions of Ε-optimal solutions for the composite convex optimization problem. As applications of our results, we derive approximate optimality conditions to cone-convex optimization problems. Our results extend or cover many known results in the literature. ? 2016, Operations Research Society of China, Periodicals Agency of Shanghai University, Science Press, and Springer-Verlag Berlin Heidelberg.
Number of references: 21
Main heading: Convex optimization
Controlled terms: Computer applications - Operations research
Uncontrolled terms: Approximate optimality - Conjugate functions - Convex optimization problems - Locally convex spaces - Optimal solutions - Regularity condition - Subdifferentials - Sufficient optimality conditions
Classification code: 723.5 Computer Applications
Computer Applications
- 912.3 Operations Research
Operations Research
DOI: 10.1007/s40305-016-0140-4
Funding Details: Number; Acronym; Sponsor: 11471059; 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. Numerical and experimental identification of seven-wire strand tensions using scale energy entropy spectra of ultrasonic guided waves
Accession number: 20181705053709
Authors: Qian, Ji (1); Chen, Xin (1); Sun, Limin (2); Yao, Guowen (1); Wang, Xu (1)
Author affiliation: (1) State Key Laboratory Breeding Base of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing; 400074, China; (2) College of Civil Engineering, Tongji University, Shanghai; 200092, China
Corresponding author: Wang, Xu(xuwang@cqjtu.edu.cn)
Source title: Shock and Vibration
Abbreviated source title: Shock Vib
Volume: 2018
Issue date: 2018
Publication year: 2018
Article number: 6905073
Language: English
ISSN: 10709622
CODEN: SHVIE8
Document type: Journal article (JA)
Publisher: Hindawi Limited, 410 Park Avenue, 15th Floor, 287 pmb, New York, NY 10022, United States
Abstract: Accurate identification of tension in multiwire strands is a key issue to ensure structural safety and durability of prestressed concrete structures, cable-stayed bridges, and hoist elevators. This paper proposes a method to identify strand tensions based on scale energy entropy spectra of ultrasonic guided waves (UGWs). A numerical method was first developed to simulate UGW propagation in a seven-wire strand, employing the wavelet transform to extract UGW time-frequency energy distributions for different loadings. Mode separation and frequency band loss of L(0,1) were then found for increasing tension, and UGW scale energy entropy spectra were extracted to establish a tension identification index. A good linear relationship was found between the proposed identification index and tensile force, and effects of propagation distance and propagation path were analyzed. Finally, UGWs propagation was examined experimentally for a long seven-wire strand to investigate attenuation and long distance propagation. Numerical and experimental results verified that the proposed method not only can effectively identify strand tensions but can also adapt to long distance tests for practical engineering. ? 2018 Ji Qian et al.
Number of references: 30
Main heading: Numerical methods
Controlled terms: Cable stayed bridges - Elevator cables - Entropy - Guided electromagnetic wave propagation - Prestressed concrete - Ultrasonic waves - Wavelet transforms - Wire
Uncontrolled terms: Experimental identification - Linear relationships - Long-distance propagation - Multi-wire strands - Practical engineering - Propagation distances - Time-frequency energy distribution - Ultrasonic guided wave
Classification code: 401.1 Bridges
Bridges
- 412 Concrete
Concrete
- 535.2 Metal Forming
Metal Forming
- 641.1 Thermodynamics
Thermodynamics
- 692.2 Elevators
Elevators
- 711.1 Electromagnetic Waves in Different Media
Electromagnetic Waves in Different Media
- 753.1 Ultrasonic Waves
Ultrasonic Waves
- 921.3 Mathematical Transformations
Mathematical Transformations
- 921.6 Numerical Methods
Numerical Methods
DOI: 10.1155/2018/6905073
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2018 Elsevier Inc.
Data Provider: Engineering Village
9. Failure mechanism of gently inclined bedding rock mass slopes with complex fissures
Accession number: 20181705037849
Authors: Wang, Lin-Feng (1); Tang, Hong-Mei (1); Tang, Fen (1); Ye, Si-Qiao (1)
Author affiliation: (1) Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education, Chongqing Jiaotong University, Chongqing; 400074, China
Source title: Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering
Abbreviated source title: Yantu Gongcheng Xuebao
Volume: 39
Issue: 12
Issue date: December 1, 2017
Publication year: 2017
Pages: 2253-2260
Language: Chinese
ISSN: 10004548
CODEN: YGXUEB
Document type: Journal article (JA)
Publisher: Chinese Society of Civil Engineering
Abstract: The collapse disasters are easily caused by the cut of fissures in gently inclined bedding rock mass slopes. The complex gently inclined bedding rock mass slope containing two fissures is studied. At first, based on the fracture mechanics and the mechanics of materials, a method for calculating the load and stability coefficient of complex gently inclined bedding rock mass slopes is established. For the case of Yangchahe gently inclined bedding rock mass slope in Qijiang County of Chongqing, the slope stability is calculated, and the results are the same as the field damage situations. Then the stability coefficient of the gently inclined bedding rock mass slope is obtained through numerical simulation. The numerical results are the same as the calculated ones. The numerical results reveal the damage mode and rules of Yangchahe gently inclined bedding rock mass slope. The compressive stress is the main factor for the damage of rock cells. The proposed method for the load and stability coefficient of complex gently inclined bedding rock mass slope may provide a theoretical basis for the design and layout of the relevant control structures. ? 2017, Editorial Office of Chinese Journal of Geotechnical Engineering. All right reserved.
Number of references: 15
Main heading: Rocks
Controlled terms: Computer simulation - Fracture - Fracture mechanics - Numerical models - Rock mechanics - Slope stability
Uncontrolled terms: Control structure - Damage modes - Failure mechanism - Inclination angles - Mechanics of materials - Numerical results - Rock mass - Stability coefficient
Classification code: 406.2 Roads and Streets
Roads and Streets
- 483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
- 723.5 Computer Applications
Computer Applications
- 921 Mathematics
Mathematics
- 931.1 Mechanics
Mechanics
- 951 Materials Science
Materials Science
DOI: 10.11779/CJGE201712014
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2018 Elsevier Inc.
Data Provider: Engineering Village
10. Optimization of Alkali Activated Slag-Limestone Powder Mortar by Response Surface Methodology
Accession number: 20181705041950
Authors: Zhang, Lanfang (1); Liu, Lina (1); Cao, Sheng (1)
Author affiliation: (1) College of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing; 400074, China
Source title: Cailiao Daobao/Materials Review
Abbreviated source title: Cailiao Daobao/Mater. Rev.
Volume: 31
Issue: 12
Issue date: December 25, 2017
Publication year: 2017
Pages: 15-19
Language: Chinese
ISSN: 1005023X
Document type: Journal article (JA)
Publisher: Cailiao Daobaoshe/ Materials Review
Abstract: Based on the central composite experimental method of response surface methodology, the alkali activated slag-limestone powder cement mortar was prepared by choosing alkali content and limestone powder content as variables, and the mechanical strength of different age was studied. The response surface of relation between each variable and the flexural, compressive strength was obtained through data processing. And the effects of various variables on strength of alkali activated slag-limestone powder cement mortar were analyzed. The response surface model of strength was established, and it can serve as a scientific method for predicting the strength of mortar at different ages in the field. The optimized results showed that when the Na2O content is 8.27% and limestone powder content is 14.02%, the components can exert synergistic effect and ensure good mechanical properties. Therefore, the response surface methodology is an effective optimization method for alkali activated cement mortar. ? 2017, Materials Review Magazine. All right reserved.
Number of references: 14
Main heading: Surface properties
Controlled terms: Cements - Compressive strength - Data handling - Lime - Limestone - Mortar - Slags - Sodium compounds
Uncontrolled terms: Alkali activated cements - Alkali activated slags - Alkali activation - Experimental methods - Limestone powder - Response surface methodology - Response surface modeling - Strength
Classification code: 412.1 Cement
Cement
- 414.3 Mortar (Before 1993, use code 412)
Mortar (Before 1993, use code 412)
- 723.2 Data Processing and Image Processing
Data Processing and Image Processing
- 804.2 Inorganic Compounds
Inorganic Compounds
- 951 Materials Science
Materials Science
Numerical data indexing: Percentage 1.40e+01%, Percentage 8.27e+00%
DOI: 10.11896/j.issn.1005-023X.2017.024.004
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2018 Elsevier Inc.
Data Provider: Engineering Village
