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Scaled boundary finite element method with exact defining curves for two-dimensional linear multi-field

Jaroon RUNGAMORNRAT, Chung Nguyen VAN

《结构与土木工程前沿（英文）》 2019年第13卷第1期页码 201-214 doi: 10.1007/s11709-018-0488-0

摘要： This paper presents an efficient and accurate numerical technique based upon the scaled boundary finite element method for the analysis of two-dimensional, linear, second-order, boundary value problems with a domain completely described by a circular defining curve. The scaled boundary finite element formulation is established in a general framework allowing single-field and multi-field problems, bounded and unbounded bodies, distributed body source, and general boundary conditions to be treated in a unified fashion. The conventional polar coordinates together with a properly selected scaling center are utilized to achieve the exact description of the circular defining curve, exact geometry of the domain, and exact spatial differential operators. Standard finite element shape functions are employed in the discretization of both trial and test functions in the circumferential direction and the resulting eigenproblem is solved by a selected efficient algorithm. The computational performance of the implemented procedure is then fully investigated for various scenarios to demonstrate the accuracy in comparison with standard linear elements.

关键词： multi-field problems defining curve exact geometry general boundary conditions SBFEM

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Review of pantograph and catenary interaction

Weihua ZHANG, Dong ZOU, Mengying TAN, Ning ZHOU, Ruiping LI, Guiming MEI

《机械工程前沿（英文）》 2018年第13卷第2期页码 311-322 doi: 10.1007/s11465-018-0494-x

摘要：

The application of electrified railway directly promotes relevant studies on pantograph-catenary interaction. With the increase of train running speed, the operating conditions for pantograph and catenary have become increasingly complex. This paper reviews the related achievements contributed by groups and institutions around the world. This article specifically focuses on three aspects: The dynamic characteristics of the pantograph and catenary components, the systems’ dynamic properties, and the environmental influences on the pantograph-catenary interaction. In accordance with the existing studies, future research may prioritize the task of identifying the mechanism of contact force variation. This kind of study can be carried out by simplifying the pantograph-catenary interaction into a moving load problem and utilizing the theory of matching mechanical impedance. In addition, developing a computational platform that accommodates environmental interferences and multi-field coupling effects is necessary in order to further explore applications based on fundamental studies.

关键词： electrified railway pantograph and catenary interaction contact force variation moving load problem mechanical impedance multi-field

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复合材料构件设计理论及仿真研究进展

陶然,贺春旺,罗俊荣,毛贻齐,马连华

《中国工程科学》 2023年第25卷第1期页码 121-130 doi: 10.15302/J-SSCAE-2023.07.008

摘要：

复合材料构件设计及仿真是复合材料性能与应用研究的重要组成部分，在复合材料产业国际竞争中发挥着关键作用；我国在此领域的系统性研究起步较晚，理论水平滞后、自主标准受制、仿真软件基础薄弱、设计与制造分离等诸多风险共存，相比支撑复合材料构件在重要装备上大规模、高水平应用的长远目标差距明显。本文针对复合材料构件在重要装备应用方面的难题与挑战，剖析了复合材料构件设计理论及仿真的共性需求，梳理了国内外发展现状与主要趋势，提出了我国复合材料构件设计理论及仿真的重点方向：极端和多场环境下复合材料构件的设计理论、复合材料构件动力学分析与设计理论、数据驱动的复合材料构件仿真方法、复合材料构件强度与寿命仿真评价方法。为此建议，开展面向装备工程应用的复合材料构件多场多尺度设计技术、动载荷下的复合材料构件性能设计技术、数据驱动的复合材料构件设计与仿真技术、复合材料构件强度与寿命仿真软件平台等研究，全面提升我国复合材料构件的设计及工程应用水平。

关键词：复合材料构件；多场多尺度设计；动力学设计；数据驱动；强度与寿命评价

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Multiscale stochastic finite element method on random field modeling of geotechnical problems – a fast

Xi F. XU

《结构与土木工程前沿（英文）》 2015年第9卷第2期页码 107-113 doi: 10.1007/s11709-014-0268-4

摘要： The Green-function-based multiscale stochastic finite element method (MSFEM) has been formulated based on the stochastic variational principle. In this study a fast computing procedure based on the MSFEM is developed to solve random field geotechnical problems with a typical coefficient of variance less than 1. A unique fast computing advantage of the procedure enables computation performed only on those locations of interest, therefore saving a lot of computation. The numerical example on soil settlement shows that the procedure achieves significant computing efficiency compared with Monte Carlo method.

关键词： multiscale finite element settlement perturbation random field geotechnical

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多孔径光学成像系统及其光场采集数学模型 Review Article

祁启明,傅瑞罡,邵铮铮,王平,范红旗

《信息与电子工程前沿（英文）》 2022年第23卷第6期页码 823-844 doi: 10.1631/FITEE.2100058

摘要：

受昆虫复眼启发，为提高光学成像质量，如获得高分辨率图像或大视场图像，研究者提出了许多多孔径光学成像系统。光场采集数学模型是联系多孔径光学成像系统结构设计与应用的纽带，但光场采集数学模型较少被关注。本文系统梳理了典型多孔径光学成像系统（仿生复眼、光场相机、相机阵列），总结了不同结构下多孔径光学成像系统的一般性光场采集数学模型。列出的数学模型既可用于计算特定多孔径光学成像系统的关键指标，如视场大小和子图像重叠比等，也可作为数学工具，便于研究者完成对成像系统的定量设计与评估。

关键词：多孔径光学成像系统；仿生复眼；光场相机；相机阵列；光场采集模型

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多目标优化与决策问题的演化算法

谢涛,陈火旺

《中国工程科学》 2002年第4卷第2期页码 59-68

摘要：

近年来，多目标优化与决策问题求解已成为演化计算的一个重要研究方向。为使演化算法的种群解能尽快收敛并均匀分布于多目标问题的非劣最优域，多目标演化算法的研究热点集中在基于Pareto最优概念的种群个体的比较与排序、适应值賦值与小生境技术等方面。介绍了多目标优化与决策技术的发展历史与分类方法，分析了基于Pareto最优概念与不基于Pareto最优概念两大类的多目标演化算法，并详细比较与分析了几种典型多目标演化算法。其次，论述了与多目标演化算法研究紧密相关的一些问题，如多目标问题解的性质，测试函数集设计，算法性能评估技术，算法收敛性，并行实现以及实际多目标优化问题的处理等。

关键词：演化计算多目标优化与决策 Pareto最优

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平原河网区水动力重构理论与实践 Article

唐洪武, 袁赛瑜, 曹昊

《工程（英文）》 2023年第24卷第5期页码 202-212 doi: 10.1016/j.eng.2022.01.015

摘要：

我国平原河网地区地势低洼，河道比降平缓，水动力弱，加上密集的人类活动，水安全问题十分突出，比如洪涝频发、水体自净能力差、水生态系统脆弱等。本文研究发现这些问题都与水动力有关，水流能量时空分布失衡是产生这些水问题的共同本源。由此，创建了平原河网区水动力重构理论。该理论在水量调控的基础上，深挖水动力及有限能量在水生态环境改善中的作用，优化布局水闸、泵站等水利工程体系，充分挖潜工程的综合效益。通过重构水动力时空分布来满足平原河网区复杂水问题统筹治理的需求。在此基础上，建立了完整的弱动力平原河网区多尺度水动力重构、多目标水力调控的理论方法和技术体系，提出了平原河网区水问题统筹治理原则。最后以扬州主城区河网活水提质为例，介绍该理论的实际应用及效果。

关键词：平原河网水安全问题水动力重构多目标统筹治理

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A review of intelligent optimization for group scheduling problems in cellular manufacturing

《工程管理前沿（英文）》页码 406-426 doi: 10.1007/s42524-022-0242-0

摘要： Given that group technology can reduce the changeover time of equipment, broaden the productivity, and enhance the flexibility of manufacturing, especially cellular manufacturing, group scheduling problems (GSPs) have elicited considerable attention in the academic and industry practical literature. There are two issues to be solved in GSPs: One is how to allocate groups into the production cells in view of major setup times between groups and the other is how to schedule jobs in each group. Although a number of studies on GSPs have been published, few integrated reviews have been conducted so far on considered problems with different constraints and their optimization methods. To this end, this study hopes to shorten the gap by reviewing the development of research and analyzing these problems. All literature is classified according to the number of objective functions, number of machines, and optimization algorithms. The classical mathematical models of single-machine, permutation, and distributed flowshop GSPs based on adjacent and position-based modeling methods, respectively, are also formulated. Last but not least, outlooks are given for outspread problems and problem algorithms for future research in the fields of group scheduling.

关键词： cellular manufacturing group scheduling flowshop literature review

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Enhanced solution representations for vehicle routing problems with split deliveries

《工程管理前沿（英文）》页码 483-498 doi: 10.1007/s42524-023-0259-z

摘要： In this study, we investigate a forest-based solution representation for split delivery vehicle routing problems (SDVRPs), which have several practical applications and are among the most difficult vehicle routing problems. The new solution representation fully reflects the nature of split delivery, and can help reduce the search space when used in heuristic algorithms. Based on the forest structure, we devise three neighborhood search operators. To highlight the effectiveness of this solution representation, we integrate these operators into a standard tabu search framework. We conduct extensive experiments on three main SDVRPs addressed in the literature: The basic SDVRP, the multidepot SDVRP, and the SDVRP with time windows. The experimental results show that the new forest-based solution representation is particularly effective in designing and implementing neighborhood operators, and that our new approach outperforms state-of-the-art algorithms on standard datasets.

关键词： vehicle routing multidepot time windows tabu search split delivery

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Overview and problems of BIM implementation in Japan

Takashi KANETA, Shuzo FURUSAKA, Nisi DENG

《工程管理前沿（英文）》 2017年第4卷第2期页码 146-155 doi: 10.15302/J-FEM-2017007

摘要： This paper aims to overview Building Information Modeling (BIM) implementation and problems of BIM implementation in Japan. First, BIM implementation guidelines and pilot projects are introduced. Then, some popular BIM software together with typical implementation cases are provided. BIM implementation in Japan is not always encouraged via a top-down consensus in architectural firms and general contractors, as the client and architects can reduce the project risk inherent in design and drawings by transferring these tasks to a general contractor. The paper finally discusses the problems in project management to present a strategy to develop a new version of BIM that will provide value to all of the stakeholders of a project.

关键词： Building Information Modeling general contractor architect drawing procurement project management

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Key problems and solutions in arch dam heightening

Zuoguang FU, Yunlong HE, Sheng SU

《结构与土木工程前沿（英文）》 2011年第5卷第1期页码 98-104 doi: 10.1007/s11709-010-0004-7

摘要： The dam heightening, which is an effective way to increase reservoir volume, has been paid close attention by engineers. Three problems should be dealt with when an arch dam needs to be heightened: stress state getting worse at dam heel, cracking on new added concrete dam surface, and weak bonding between new added concrete and old dam. Taking Geba arch dam as an example, these problems are examined in details through simulation analysis by the finite element method. The tensile stresses on dam’s surface and joint face that have certain relations to the dam heightening can be controlled by some measures.

关键词： arch dam heighten tensile stress finite element method

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Environmental Antibiotics and Antibiotic Resistance: From Problems to Solutions

Xin Yu, Virender K. Sharma, Hui Li

《环境科学与工程前沿（英文）》 2019年第13卷第3期 doi: 10.1007/s11783-019-1137-0

摘要：

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基于遗传算法的传感器网络拓扑控制研究

刘林峰,庄艳艳,刘业

《中国工程科学》 2008年第10卷第2期页码 66-71

摘要：

无线传感器网络的首要设计目标是延长网络生命期，网络的拓扑控制是实现这一目标的支撑基础。针对传统拓扑控制方案所获拓扑的连通冗余度高或结构健壮性低等弊端，将问题转化为多判据最小生成树模型，提出了一种基于遗传算法的拓扑控制方案。仿真实验结果表明，该方案可获得具有网络整体功耗低、结构健壮性高和节点间通信干扰小等特点的拓扑结构，因而能够有效地延长传感器网络生命期。

关键词：无线传感器网络拓扑控制多判据最小生成树问题遗传算法

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激光再制造技术与应用发展研究

姚喆赫,姚建华,向巧

《中国工程科学》 2020年第22卷第3期页码 63-70 doi: 10.15302/J-SSCAE-2020.03.011

摘要：

激光再制造技术作为制造技术创新的前沿领域，深刻改变着高端装备的设计与运行方式，是绿色再制造的重要支撑技术，是促进制造产业可持续发展的重要力量。本文从激光再制造技术的宏观需求入手，梳理了激光再制造技术的发展及应用现状，凝练了激光再制造技术和产业在发展过程中面临的挑战，进而提出了面向2025 年、2035 年以及2050 年的分阶段发展目标。针对当前我国激光再制造技术在专用材料、核心器件、再制造理念与标准体系等方面存在的问题与挑战，研究提出：加强战略层面的积极引导；构建激光增材再制造材料基因组体系；完善标准化体系和高层次应用型人才培养体系；加大应用推广力度，引导行业整合；建立合作平台，加快关键共性技术创新发展，为激光再制造技术及其产业发展提供支撑。

关键词：激光再制造，多能场，现场再制造，全生命周期

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Environmental problems of vibrations induced by railway traffic

XIA He, CAO Yanmei, De Roeck Guido, Degrande Geert

《结构与土木工程前沿（英文）》 2007年第1卷第2期页码 142-152 doi: 10.1007/s11709-007-0015-1

摘要： In this paper, a general review is made on the problems of vibrations of the ground and nearby buildings induced by railway traffic, and on the researches on this subject in theoretical analyses, numerical simulations, and field experiments. The characteristics of ground vibrations induced by railway traffic and their propagation, from the aspects of duration, intensity distribution, vehicle load and speed, are summarized. The vibration influences on the daily life of people, the operation of high-tech devices and the safety of buildings, and the vibration properties of subsoil and buildings adjacent to the underground, ground and elevated railway systems are introduced.

关键词： underground vibration numerical subsoil propagation