Search | Engineering

订阅投稿

首页工程期刊工程焦点工程成就工程前沿关于我们 English

资源类型

期刊论文 968

会议视频 20

会议信息 1

会议专题 1

年份

2024 2

2023 90

2022 114

2021 105

2020 67

2019 59

2018 66

2017 61

2016 60

2015 56

2014 22

2013 25

2012 28

2011 26

2010 24

2009 17

2008 23

2007 25

2006 31

2005 14

展开︾

关键词

多目标优化 9

神经网络 5

人工智能 4

智能制造 4

碳中和 3

能源 3

2021全球十大工程成就 2

5G 2

BNLAS 2

COVID-19 2

三维 2

分布式系统 2

动态规划 2

可靠性灵敏度 2

复杂性 2

复杂系统 2

并联机构 2

汶川地震 2

展开︾

检索范围：

排序：展示方式：

Numerical investigation of the effectiveness of effusion cooling for plane multi-layer systems with different

Dieter BOHN, Robert KREWINKEL

《能源前沿（英文）》 2009年第3卷第4期页码 406-413 doi: 10.1007/s11708-009-0041-x

摘要： Within Collaborative Research Center (SFB) 561 “Thermally Highly Loaded, Porous and Cooled Multi-Layer Systems for Combined Cycle Power Plants” at RWTH Aachen University, an effusion-cooled multi-layer plate configuration is investigated numerically by the application of a three-dimensional in-house fluid flow and heat transfer solver, CHTflow. CHTflow is a conjugate code, which yields information on the temperature distribution in the solid body. This enables a detailed discussion of the effects of a change in materials. The geometrical set-up and the fluid flow conditions derive from modern gas turbine combustion chambers and bladings. Within the SFB, two different multi-layer systems, one consisting of substrate made of CMSX-4 (a single-crystal super-alloy), an MCrAlY-bondoat and a ZrO thermal barrier coating (TBC), and the other consisting of a NiAl-alloy and a graded bondcoat/TBC, have been investigated. The grading will increase the life-span of the TBC as it can better compensate the different thermal expansion coefficients of different materials. The main focus in this study is on the different substrate materials, because the thermal conductivity of the NiAl is considerably higher than that of CMSX-4, which leads to different temperature profiles in the components. The numerical grid for the simulations contains the coolant supply (plenum), the solid body for the conjugate calculations, and the main flow area on the plate. The effusion-cooling is realized by finest drilled shaped holes with a diameter of 0.2mm. The investigation is concentrated on a cooling hole geometry with a laterally widened fan-shaped outlet, contoured throughout, and one without lateral widening that is only shaped in the TBC-region of the system. Two blowing ratios, =0.28 and =0.48, are investigated, both for a hot gas Mach number of 0.25. The results for the lower blowing ratio and the fully contoured hole are discussed as well as those of the higher blowing ratio and the non-laterally widened hole. These represent two characteristic cases.

关键词： conjugate calculation effectiveness of effusion cooling multi-layer systems CMSX-4 NiAl-FG75

HTML PDF 收藏

/sub> emission drivers under regional industrial transfer in China’s Yangtze River Economic Belt: a multi-layer

Huijuan JIANG, Yong GENG, Xu TIAN, Xi ZHANG, Wei CHEN, Ziyan GAO

《能源前沿（英文）》 2021年第15卷第2期页码 292-307 doi: 10.1007/s11708-020-0706-z

摘要： With the relocation of heavy industries moving from downstream region to upstream and midstream regions in the Yangtze River Economic Belt (YREB), it is critical to encourage coordinated low carbon development in different regions within the YREB. This paper uncovers the evolution of CO emissions in different regions within the YREB for the period of 2000–2017. It decomposes regional CO emission changes using the temporal and cross-regional three-layer logarithmic mean Divisia index (LMDI) method. Besides, it decomposes industrial CO emission changes using the temporal two-layer LMDI method. The research results show that economic growth is the major driver for regional CO emission disparities. The mitigation drivers, such as energy intensity and energy structure, lead to a more decreased CO emission in the downstream region than in the upstream and midstream regions. In addition, it proposes several policy recommendations based upon the local realities, including improving energy efficiency, optimizing energy structure, promoting advanced technologies and equipment transfers, and coordinating the development in the upstream, midstream and downstream regions within the YREB.

关键词： CO₂ emission multi-layer LMDI decomposition industrial transfer governance

HTML PDF 收藏

弹丸在多层复合介质中的爆炸破坏效应研究

周宁,任辉启,沈兆武,刘瑞朝

《中国工程科学》 2006年第8卷第8期页码 56-60

摘要：

根据实验得到的运动弹丸在多层复合介质中不同深度爆炸时产生的弹坑形状、体积及破坏面积，对破坏效应进行了理论分析，建立了弹丸在多层复合介质中的爆炸破坏分区；考虑主要影响破坏效果因素条件下应用量纲分析方法，并结合实验数据得到了破坏参数与比炸深的无量纲关系式和关系曲线，由这些曲线能够方便地查找所需最佳破坏效果对应的比炸深，在相同条件下，该结果可推广到类似目标的爆炸破坏效应分析。

关键词：爆炸力学多层介质量纲分析爆炸破坏分区

HTML PDF 收藏

Control on self-assembly structures of rod-coil-rod (PANI)-(PEG)-(PANI) triblock copolymer

YANG Zhifang, WU Jingao, YANG Yingkui, ZHOU Xingping, XIE Xiaolin

《化学科学与工程前沿（英文）》 2008年第2卷第1期页码 85-88 doi: 10.1007/s11705-008-0003-6

摘要： The self-assembly behaviors of the rod-coil-rod (PANI)-(PEG)-(PANI) triblock copolymer are investigated in different solvents, such as -methyl-2-pyrrolidone (NMP), dimethyl formamide (DMF), ethanol and water. The effects of solvents, concentration and ultrasonic irradiation on self-assembly are discussed. The results indicate that the triblock copolymer forms particles, rods, fiber, networks and fiber bands in the above solvents, respectively. Especially, the triblock copolymer can form a multi-layer, tri-dimensional fibrous network and a petaline structure from the mono-layer fibrous network with the increase of its concentration in ethanol. Also, the ultrasonic irradiation has a great effect on the self-assembly of the triblock copolymer.

关键词： different multi-layer mono-layer dimethyl formamide concentration

HTML PDF 收藏

一种适用于自动驾驶汽车的多层地图模型和车道级轨迹规划 Article

江昆, 杨殿阁, 柳超然, 张涛, 肖中阳

《工程（英文）》 2019年第5卷第2期页码 305-318 doi: 10.1016/j.eng.2018.11.032

摘要：

越来越多的司机依赖于汽车或手机上的电子地图导航系统来选择最佳的驾驶路线，以节省时间和提高安全性，在不久的将来，电子地图和导航系统有望在未来交通运输系统中发挥更大的作用。为了将现有的导航系统扩展到更多的应用领域，如自动驾驶，需要考虑在传统道路地图模型的基础上，建立车道级地图模型和车道级轨迹规划。本研究针对传统电子地图内容不够丰富的局限性，提出了一种全新的七层自动驾驶地图结构模型，并将它命名为清华地图模型。考虑车辆换道、转向和直行等不同行车特点，建立了车道级路段行车代价模型，建立一种分层路径轨迹搜索方法，能够在道路和车道网络中实现快速的轨迹规划，能够很好地支持自动驾驶的车道级轨迹规划。通过在虚拟道路网络和实际道路网络上的测试，充分验证了该地图模型和算法的灵活性和有效性。

关键词：车道级地图路径规划清华地图模型行车代价模型

HTML PDF 收藏

基于5G车用无线通信技术网络的工业园区多层协同框架 Article

史彦军, 韩俏梅, 沈卫明, 王现斌

《工程（英文）》 2021年第7卷第6期页码 818-831 doi: 10.1016/j.eng.2020.12.021

摘要：

第五代（5G）无线通信网络有望在垂直产业转型中发挥重要的作用。在众多激动人心的5G应用中，通过车用无线通信技术（V2X）通信可更高效地执行工业园区内的物流任务。本文提出了一种基于V2X的工业园区物流管理多层协同框架。该框架包括三层：感知与执行层、物流层以及配置层。除以上三层之间的协同外，本研究还讨论了设备、边缘服务器以及云服务之间的协同。针对工业园区内的高效物流，可通过四项功能来实现任务协同，这四项功能分别是：环境感知与地图构建、任务分配、路径规划，以及车辆运动。为动态协调这些功能，将采用5G切片和V2X通信技术支持的设备边云协同。随后，利用目标级联分析法对工业园区协同方案进行配置和评估。最后，通过一工业园区物流分析案例，验证了所提出协同框架的可行性。

关键词： 5G 车用无线通信技术工业园区物流设备边云协同目标级联分析

HTML PDF 收藏

A naive optimization method for multi-line systems with alternative machines

Weichang KONG, Fei QIAO, Qidi WU

《机械工程前沿（英文）》 2019年第14卷第4期页码 377-392 doi: 10.1007/s11465-019-0544-z

摘要： The scheduling of parallel machines and the optimization of multi-line systems are two hotspots in the field of complex manufacturing systems. When the two problems are considered simultaneously, the resulting problem is much more complex than either of them. Obtaining sufficient training data for conventional data-based optimization approaches is difficult because of the high diversity of system structures. Consequently, optimization of multi-line systems with alternative machines requires a simple mechanism and must be minimally dependent on historical data. To define a general multi-line system with alternative machines, this study introduces the capability vector and matrix and the distribution vector and matrix. A naive optimization method is proposed in accordance with classic feedback control theory, and its key approaches are introduced. When a reasonable target value is provided, the proposed method can realize closed-loop optimization to the selected objective performance. Case studies are performed on a real 5/6-inch semiconductor wafer manufacturing facility and a simulated multi-line system constructed on the basis of the MiniFAB model. Results show that the proposed method can effectively and efficiently optimize various objective performance. The method demonstrates a potential for utilization in multi-objective optimization.

关键词： multi-line systems alternative machines feedback control closed-loop optimization

HTML PDF 收藏

基于到达时间差和到达频率差的多层等梯度声速剖面建模与声学定位 Research Article

詹东洲1,王思甜1,蔡守桂1,郑华荣2,徐文2

《信息与电子工程前沿（英文）》 2023年第24卷第1期页码 164-175 doi: 10.1631/FITEE.2100398

摘要：在水下媒介中，声速随着水深、温度和盐度而变化。水体的不均匀性导致声线弯折，使得现有基于声信号直线传播假设的定位算法不够精确。为实现水下声学传感网络中的高精度节点定位，本文首先使用线性分割近似方法，提出多层等梯度声速剖面（sound speed profile，SSP）模型。基于此模型，可将声线跟踪问题转化为多项式寻根问题。利用传感器节点处信号多普勒频移的导数，提出一种新的使用到达时间差（time difference of arrival，TDOA）和到达频率差（frequency difference of arrival，FDOA）的水下节点定位算法。通过模拟仿真，可以证明所提算法的有效性。与传统基于直线传播假设的方法相比，所提算法可有效处理声线弯折现象。此外，研究了不同SSP建模误差下的估计精度。总体而言，新提出的方法可以实现准确可靠的节点定位。

关键词：水下声学传感器网络；声学定位；声速剖面；到达时间差（TDOA）；到达频率差（FDOA）

HTML PDF 收藏

Assessing artificial neural network performance for predicting interlayer conditions and layer modulusof multi-layered flexible pavement

Lingyun YOU, Kezhen YAN, Nengyuan LIU

《结构与土木工程前沿（英文）》 2020年第14卷第2期页码 487-500 doi: 10.1007/s11709-020-0609-4

摘要： The objective of this study is to evaluate the performance of the artificial neural network (ANN) approach for predicting interlayer conditions and layer modulus of a multi-layered flexible pavement structure. To achieve this goal, two ANN based back-calculation models were proposed to predict the interlayer conditions and layer modulus of the pavement structure. The corresponding database built with ANSYS based finite element method computations for four types of a structure subjected to falling weight deflectometer load. In addition, two proposed ANN models were verified by comparing the results of ANN models with the results of PADAL and double multiple regression models. The measured pavement deflection basin data was used for the verifications. The comparing results concluded that there are no significant differences between the results estimated by ANN and double multiple regression models. PADAL modeling results were not accurate due to the inability to reflect the real pavement structure because pavement structure was not completely continuous. The prediction and verification results concluded that the proposed back-calculation model developed with ANN could be used to accurately predict layer modulus and interlayer conditions. In addition, the back-calculation model avoided the back-calculation errors by considering the interlayer condition, which was barely considered by former models reported in the published studies.

关键词： asphalt pavement interlayer conditions finite element method artificial neural network back-calculation

HTML PDF 收藏

Hierarchical fractal structure of perfect single-layer graphene

T. Zhang, K. Ding

《机械工程前沿（英文）》 2013年第8卷第4期页码 371-382 doi: 10.1007/s11465-013-0279-1

摘要：

The atomic lattice structure of perfect single-layer graphene that can actually be regarded as a kind of hierarchical fractal structure from the perspective of fractal geometry was studied for the first time. Three novel and special discoveries on hierarchical fractal structure and sets were unveiled upon examination of the regular crystal lattices of the single-layer graphene. The interior fractal-type structure was discovered to be the fifth space-filling curve from physical realm. Two efficient methods for calculating the fractal dimension of this fresh member was also provided. The outer boundary curve had a fractal dimension equal to one, and a multi-fractal structure from a naturally existing material was found for the first time. A series of strict self-similar hexagons comprised a rotating fractal set. These hexagons slewed at a constant counterclockwise angle of 19.1° when observed from one level to the next higher level. From the perspective of fractal geometry, these pioneering discoveries added three new members to the existing regular fractal structures and sets. A fundamental example of a multi-fractal structure was also presented.

关键词： hierarchical fractal structure fractal dimension the fifth space-filling curve multi-fractal structure

HTML PDF 收藏

Molecular level simulations on multi-component systems —a morphology prediction method

C. SCHMIDT, J. ULRICH

《化学科学与工程前沿（英文）》 2013年第7卷第1期页码 49-54 doi: 10.1007/s11705-013-1307-8

摘要： The crystal morphology grown from a solution composed of an organic solvent, solute and additive can be predicted reliably by a computational method. Modeling the supersaturated solution as liquid phase is achieved by employing commercial software. The molecular composition of this solution is a required input parameter. The face specific diffusion coefficient of the solid (crystal surface) and liquid (solution) system is determined using the molecular dynamics procedure. The obtained diffusion coefficient is related to the specific face growth rate via the attachment energy of the pure morphology. The significant improvements are achieved in the morphology prediction because the investigation on the face growth rates in a complex growth environment (as multi-component solutions with additives) can be carried out based on the diffusion coefficients.

关键词： crystallization morphology molecular dynamics solution

HTML PDF 收藏

Motion control of multi-actuator hydraulic systems for mobile machineries: Recent advancements and future

Bing XU, Min CHENG

《机械工程前沿（英文）》 2018年第13卷第2期页码 151-166 doi: 10.1007/s11465-018-0470-5

摘要：

This paper presents a survey of recent advancements and upcoming trends in motion control technologies employed in designing multi-actuator hydraulic systems for mobile machineries. Hydraulic systems have been extensively used in mobile machineries due to their superior power density and robustness. However, motion control technologies of multi-actuator hydraulic systems have faced increasing challenges due to stringent emission regulations. In this study, an overview of the evolution of existing throttling control technologies is presented, including open-center and load sensing controls. Recent advancements in energy-saving hydraulic technologies, such as individual metering, displacement, and hybrid controls, are briefly summarized. The impact of energy-saving hydraulic technologies on dynamic performance and control solutions are also discussed. Then, the advanced operation methods of multi-actuator mobile machineries are reviewed, including coordinated and haptic controls. Finally, challenges and opportunities of advanced motion control technologies are presented by providing an overall consideration of energy efficiency, controllability, cost, reliability, and other aspects.

关键词： motion control electrohydraulic control energy efficiency mobile machineries

HTML PDF 收藏

Energy systems engineering: methodologies and applications

Pei LIU, Efstratios N. PISTIKOPOULOS, Zheng LI

《能源前沿（英文）》 2010年第4卷第2期页码 131-142 doi: 10.1007/s11708-010-0035-8

摘要： Energy systems are the major contributor to ever-increasing primary energy consumption and consequent greenhouse gas emissions. To tackle these critical problems, planning and design of energy systems needs to be improved towards a more efficient, cost-effective, and environmentally benign direction. However, although there are many technical choices available, they are often developed separately by their own technical communities and driven by their specific interest, thus methods and experience obtained in planning and design of a certain type of energy systems are usually not applicable to other types of energy systems. Energy systems engineering provides a generic methodological framework to facilitate the planning and design of energy systems and to produce integrated solutions to real-life complex energy problems via a systematic approach.In this paper, we present an overview of key methodologies of energy systems engineering, covering superstructure based modelling, mixed-integer programming, multi-objective optimization, optimization under uncertainty, and life-cycle assessment. Applications of these methodologies in polygeneration energy systems design, hydrogen infrastructure planning, and design of energy systems in commercial buildings are provided to demonstrate the capability of these methodologies.

关键词： energy systems engineering superstructure mixed-integer programming multi-objective optimization optimization under uncertainty life-cycle assessment

HTML PDF 收藏

多模型广义标签多伯努利滤波器的推导：多目标混合系统解决方案 Research Articles

吴卫华,蔡益朝,金宏斌,郑茂,冯讯,关泽文

《信息与电子工程前沿（英文）》 2021年第22卷第1期页码 1-140 doi: 10.1631/FITEE.2000105

摘要：本文将传统（单目标）混合系统扩展到多目标混合系统，重点研究多机动目标跟踪系统。该系统由连续状态，离散可切换状态以及离散、时不变且唯一性状态组成。通过定义一个新的广义标签多伯努利密度，我们证明对于多目标混合系统，它在查普曼-柯尔莫哥洛夫（Chapman-Kolmogorov）预测和贝叶斯更新下是闭合的。换言之，我们严格推导了多目标混合系统的解决方案，即多模型广义标签多伯努利滤波器——该滤波器虽已被开发，但此前并未得到严格证明。

关键词：多机动目标跟踪；多模型；广义标签多伯努利滤波器；多目标混合系统

HTML PDF 收藏

TRADE-OFFS IN THE DESIGN OF SUSTAINABLE CROPPING SYSTEMS AT A REGIONAL LEVEL: A CASE STUDY ON THE NORTH

《农业科学与工程前沿（英文）》 2022年第9卷第2期页码 295-308 doi: 10.15302/J-FASE-2021434

摘要：

Since the Green Revolution cropping systems have been progressively homogenized and intensified with increasing rates of inputs such as fertilizers, pesticides and water. This has resulted in higher crop productivity but also a high environmental burden due to increased pollution and water depletion. To identify opportunities for increasing the productivity and reducing the environmental impact of cropping systems, it is crucial to assess the associated trade-offs. The paper presents a model-based analysis of how 30 different crop rotations practiced in the North China Plain could be combined at the regional level to overcome trade-offs between indicators of economic, food security, and environmental performance. The model uses evolutionary multi-objective optimization to maximize revenues, livestock products, dietary and vitamin C yield, and to minimize the decline of the groundwater table. The modeling revealed substantial trade-offs between objectives of maximizing productivity and profitability versus minimizing ground water decline, and between production of livestock products and vitamin C yield. Six strategies each defining a specific combination of cropping systems and contributing to different extents to the various objectives were identified. Implementation of these six strategies could be used to find opportunities to mitigate the trade-offs between objectives. It was concluded that a holistic analysis of the potential of a diversity cropping systems at a regional level is needed to find integrative solutions for challenges due to conflicting objectives for food production, economic viability and environmental protection.

关键词： crop rotation / food security / multi-objective optimization / water use

HTML PDF 收藏

标题作者时间类型操作

Numerical investigation of the effectiveness of effusion cooling for plane multi-layer systems with different

Dieter BOHN, Robert KREWINKEL

期刊论文

/sub> emission drivers under regional industrial transfer in China’s Yangtze River Economic Belt: a multi-layer

Huijuan JIANG, Yong GENG, Xu TIAN, Xi ZHANG, Wei CHEN, Ziyan GAO

期刊论文

弹丸在多层复合介质中的爆炸破坏效应研究

周宁,任辉启,沈兆武,刘瑞朝

期刊论文