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关键词

C-Bézier曲面；降阶；边界约束 1

三维构造 1

临界应力 1

乳状液 1

冲压工艺 1

功能表面 1

加热、通风和空调 1

动态响应 1

协同控制 1

吸附 1

地质曲面 1

多源地质数据 1

大幅面 1

子模型 1

废水处理 1

弯曲结构表面；柔性加速度计；微机电系统（MEMS）技术；无线非接触式测量 1

拼接误差 1

接触分析 1

插值—逼近拟合 1

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Interpolation of a spline developable surface between a curve and two rulings

Alicia CANTÓN,Leonardo FERNÁNDEZ-JAMBRINA

《信息与电子工程前沿（英文）》 2015年第16卷第3期页码 173-190 doi: 10.1631/FITEE.14a0210

摘要： In this paper we address the problem of interpolating a spline developable patch bounded by a given spline curve and the first and the last rulings of the developable surface. To complete the boundary of the patch, a second spline curve is to be given. Up to now this interpolation problem could be solved, but without the possibility of choosing both endpoints for the rulings. We circumvent such difficulty by resorting to degree elevation of the developable surface. This is useful for solving not only this problem, but also other problems dealing with triangular developable patches.

关键词： Developable surfaces Spline surfaces Blossoms

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可展曲面的焦散曲线 Research Articles

Mikl髎 HOFFMANN1,2, Imre JUH罶Z3, Ede TROLL1

《信息与电子工程前沿（英文）》 2022年第23卷第3期页码 479-487 doi: 10.1631/FITEE.2000613

摘要：考虑来自点光源或无穷远的光线经过某个镜面曲面反射时，反射光线可产生一个包络，被称为焦散曲线。本文我们研究了镜面曲面为可展曲面的情形。这些具有显式表达的焦散曲面也是可展曲面，并且与初始镜面曲面类型相同。提供了高效的算法以找到3种可展曲面（锥面、柱面和空间曲线的切线面）的焦散面。此外，提供了焦散面在当代自由形式建筑设计中的潜在应用。

关键词：焦散曲线；可展曲面；反射光线；回归曲线

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Geosynthetics used to stabilize vegetated surfaces for environmental sustainability in civil engineering

Jie HAN,Jun GUO

《结构与土木工程前沿（英文）》 2017年第11卷第1期页码 56-65 doi: 10.1007/s11709-016-0380-8

摘要： Geosynthetics, factory-manufactured polymer materials, have been successfully used to solve many geotechnical problems in civil engineering. Two common applications are earth stabilization and erosion control. Geosynthetics used for earth stabilization include but are not limited to stabilized slopes, walls, embankments, and roads. Geosynthetics used for erosion control are mostly related to slopes, river channels and banks, and pond spillways. To enhance environmental sustainability, vegetation has been increasingly planted on the facing or surfaces of these earth structures. Under such a condition, geosynthetics mainly function as surficial soil stabilization while vegetation provides green appearance and erosion protection of earth surfaces. Recently, geosynthetic or geosynthetic-like material has been used to form green walls outside or inside buildings to enhance sustainability. Geosynthetics and vegetation are often integrated to provide combined benefits. The interaction between geosynthetics and vegetation is important for the sustainability of the earth and building wall surfaces. This paper provides a review of the current practice and research in the geosynthetic stabilization of vegetated earth and building surfaces for environmental sustainability in civil engineering with the emphases on geosynthetic used for erosion protection, geosynthetic-stabilized slopes, geosynthetic-stabilized unpaved shoulders and parking lots, and geosynthetic-stabilized vegetated building surfaces.

关键词： erosion geosynthetic stabilization sustainability vegetation

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Contact of surfaces and contact characteristics of offset surfaces

CAO Lixin, GONG Hu, LIU Jian

《机械工程前沿（英文）》 2008年第3卷第3期页码 318-324 doi: 10.1007/s11465-008-0067-5

摘要： Based on differential geometry, the contact problems of two surfaces are discussed in this paper. The relationship between the contact status of two surfaces and that of offset surfaces are also analyzed. For a 5-axis NC machining, some research such as optimization of cutter location and calculation of the geometrical cusp height are important. The research results indicate that the relative normal curvature is an important geometrical invariant for describing the contact state of two surfaces. For point contact two surfaces, the calculation equation for the second order remained error is given. For line contact two surfaces, the condition of the second order line contact is that the principal directions and curvatures of the two surfaces are the same along the contact curve. If two surfaces keep the second order line contact, their two offset surfaces will also keep the second order line contact, and their third order remained errors are also uniform with that of the two offset surfaces.

关键词： relative important geometrical relationship geometrical invariant calculation

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Optimal localization of complex surfaces in CAD-based inspection

XU Jinting, LIU Weijun, SUN Yuwen

《机械工程前沿（英文）》 2008年第3卷第4期页码 426-433 doi: 10.1007/s11465-008-0068-4

摘要： Complex surface inspection requires the optimal localization of the measured surface related to the design surface so that the two surfaces can be compared in a common coordinate frame. This paper presents a new technique for solving the localization problem. The basic approach consists of two steps: 1) rough localization of the measured points to the design surface based on curvature features, which can produce a good initial estimate for the optimal localization; 2) fine localization based on the least-square principle so that the deviation between the measured surface and the design surface is minimized. To efficiently compute the closest points on the design surface of the measured points, a novel method is proposed. Since this approach does not involve an iterative process of solving non-linear equations for the closest points, it is more convenient and robust. The typical complex surface is used to test the developed algorithm. Analysis and comparison of experimental results demonstrate the validity and applicability of the algorithm.

关键词： deviation comparison non-linear localization inspection

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Strategies on designing multifunctional surfaces to prevent biofilm formation? ?

Yang Lu,Zhanguo Yue,Wei Wang,Zhiqiang Cao

《化学科学与工程前沿（英文）》 2015年第9卷第3期页码 324-335 doi: 10.1007/s11705-015-1529-z

摘要： Bacteria adhesion and biofilm formation have raised severe problems on public health, food industry and many other areas. A variety of reagents and surface coatings have been developed to kill bacteria and/or limit their interaction with surfaces. It has also attracted many efforts to integrate different bactericidal elements together and maximize antibacterial efficiency. Herein, we review mechanisms for both passive and active approaches to resist and kill bacteria respectively, and discuss integrated strategies based on these two approaches. We also offer perspective on future research direction.

关键词： antimicrobial surface multifunctional

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Morphologies of diblock copolymer confined in a slit with patterned surfaces studied by dissipative particle

FENG Jian, HUANG Yongmin, LIU Honglai, HU Ying

《化学科学与工程前沿（英文）》 2007年第1卷第2期页码 132-139 doi: 10.1007/s11705-007-0025-5

摘要： Diblock copolymers with ordered mesophase structures have been used as templates for nano-fabrication. Unfortunately, the ordered structure only exists at micrometer-scale areas, which precludes its use in many advanced applications. To overcome this disadvantage, the diblock copolymer confined in a restricted system with a patterned surface is proved to be an effective means to prohibit the formation of defects and obtain perfect ordered domains. In this work, the morphologies of a thin film of diblock copolymer confined between patterned and neutral surfaces were studied by dissipative particle dynamics. It is shown that the morphology of the symmetric diblock copolymer is affected by the ratio of the pattern period on the surface to the lamellar period of the symmetric diblock copolymer and by the repulsion parameters between blocks and wall particles. To eliminate the defects in the lamellar phase, the pattern period on the surface must match the lamellar period. The difference in the interface energy of different compartments of the pattern should increase with increasing film thickness. The pattern period on the surface has a scaling relationship with the chain length, which is the same as that between the lamellar period and the chain length. The lamellar period is also affected by the polydispersity of the symmetric diblock copolymer. The total period is the average of the period of each component multiplied by the weight of its volume ratio. The morphologies of asymmetric diblock copolymers are also affected by the pattern on the surface, especially when the matching period of the asymmetric diblock copolymer is equal to the pattern period, which is approximately equal to the lamellar period of a symmetric diblock copolymer with the same chain length.

关键词： weight nano-fabrication morphology matching dissipative particle

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A hypothesis for crack free interior surfaces of Longyou caverns caved in argillaceous siltstone 2000

Zhong Qi YUE, Shaopeng FAN, Zhifa YANG, Lihui LI, Luqing ZHANG, Zhongjian ZHANG,

《结构与土木工程前沿（英文）》 2010年第4卷第2期页码 165-177 doi: 10.1007/s11709-010-0018-1

摘要： Five complete caverns were discovered in Longyou in 1992. They were manually caved in argillaceous siltstone at shallow depths more than 2000 years ago. When they were un-watered, their integrity was maintained completely, and their interior rock surfaces were free of old cracks. Since then, however, the rock’s interior faces have initiated and propagated more and more cracks. This paper attempts to address the question of why the rock interior faces were free of old cracks once they were unearthed. To address this question, this paper proposes a hypothesis that the argillaceous siltstone has the ability of self-healing its cracks over a short period of time under weak acid water environment. Data and evidence are presented herewith to prove the hypothesis. They include observations and measurements in the field and test results in the laboratory. Specifically, a three-point bending test is used to form a tensile crack in a rectangular rock specimen and a dead load test for the specimen immersed in initially weak acid water is used for self-healing its crack. The results have shown that the argillaceous siltstone is in a state of weak alkalinity and the rain water at the site is in a state of weak acidity. Therefore, when it is immersed in weak acid water for some time, the argillaceous siltstone would be able to make chemical reactions to generate new minerals such as calcite. The new minerals would be able to infill the cracks and then heal the crack within a few years. Once the crack is self-healed, the rock can regain its strength and integrity. Consequently, the rock interior surfaces could be free of old cracks when the water was pumped out of the caverns.

关键词： rock cavern grotto Longyou argillaceous siltstone crack water environment self-healing

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Optimal design analysis of a tubular heat exchanger network with extended surfaces using multi-objective

Hassan HAJABDOLLAHI, Mohammad SHAFIEY DEHAJ, Babak MASOUMPOUR, Mohammad ATAEIZADEH

《能源前沿（英文）》 2022年第16卷第5期页码 862-875 doi: 10.1007/s11708-022-0839-3

摘要： The present work aims to investigate the influence of extended surfaces (fins) on the multi-objective optimization of a tubular heat exchanger network (THEN). An increase in the heat transfer area using various extended surfaces (fins) to enhance the performance of the heat exchanger was used while considering the effectiveness and total heat transfer area as two objective functions. In addition to the simulation of simple fins, a new set of fins, called constructal fins, was designed based on the constructal theory. Tubular heat exchanger network design parameters were chosen as optimization variables, and optimization results were achieved in such a way as to enhance the effectiveness and decrease the total heat transfer area. The results show the importance of constructal fins in improving the objective functions of heat exchangers. For instance, the simple fins case enhances the effectiveness by up to 5.3% compared to that without fins (usual heat exchanger) while using constructal fins, in addition to the 7% increment of effectiveness, reduces the total heat transfer area by 9.47%. In order to optimize the heat exchanger, the heat transfer rate and cold fluid temperature must increase, and at the same time, the hot exiting fluid temperature should decrease at the same constant total heat transfer area, which is higher in the constructal fins case. Finally, optimized design variables were studied for different cases, and the effects of various fins were reported.

关键词： constructal theory extended surface effectiveness total heat transfer area multi-objective optimization

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Leidenfrost drops on micro/nanostructured surfaces

Vishal TALARI, Prakhar BEHAR, Yi LU, Evan HARYADI, Dong LIU

《能源前沿（英文）》 2018年第12卷第1期页码 22-42 doi: 10.1007/s11708-018-0541-7

摘要： In the Leidenfrost state, the liquid drop is levitated above a hot solid surface by a vapor layer generated via evaporation from the drop. The vapor layer thermally insulates the drop from the heating surface, causing deteriorated heat transfer in a myriad of important engineering applications. Thus, it is highly desirable to suppress the Leidenfrost effect and elevate the Leidenfrost temperature. This paper presents a comprehensive review of recent literature concerning the Leidenfrost drops on micro/nanostructured surfaces with an emphasis on the enhancement of the Leidenfrost temperature. The basic physical processes of the Leidenfrost effect and the key characteristics of the Leidenfrost drops were first introduced. Then, the major findings of the influence of various micro/nanoscale surface structures on the Leidenfrost temperature were presented in detail, and the underlying enhancement mechanism for each specific surface topology was also discussed. It was concluded that multiscale hierarchical surfaces hold the best promise to significantly boost the Leidenfrost temperature by combining the advantages of both micro- and nanoscale structures.

关键词： Leidenfrost drop Leidenfrost temperature heat transfer enhancement micro/nanostructured surfaces

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带约束条件的C-Bézier曲面最优降多阶逼近 Article

Lian ZHOU, Xin-hui LIN, Hong-yan ZHAO, Jun CHEN

《信息与电子工程前沿（英文）》 2017年第18卷第12期页码 2009-2016 doi: 10.1631/FITEE.1700458

摘要：本文提出了一种在L2范数下C-Bézier曲面带约束条件的降多阶逼近最优方法。利用C-Bézier基函数的转换矩阵，得到了降阶曲面控制顶点的显式矩阵表示。结合指定的边界约束条件，该法利用于对分片连续曲面或细分子曲面同时降多阶逼近，所得到的系列降阶曲面整体上保持G1连续。数值实验表明该方法的优质高效。

关键词： C-Bézier曲面；降阶；边界约束

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基于Bézier曲线的柔性曲面装配变动分析 None

Zhen-yu LIU, Shi-en ZHOU, Jin CHENG, Chan QIU, Jian-rong TAN

《信息与电子工程前沿（英文）》 2018年第19卷第6期页码 796-808 doi: 10.1631/FITEE.1601619

摘要：在装配过程中，柔性零件表面特征会发生形状变化，相比刚性体，其变动分析复杂许多。现有柔性装配变动分析方法大多未考虑零件表面邻近点的相互关系，或者将零件表面上所有特征点的概率分布情况视为统一。本文将柔性曲面零件装配简化为边侧线匹配问题，提出基于Bézier曲线来表征曲面零件边侧线的方法，解决了柔性零件装配中考虑表面连续性的曲面零件装配变动分析问题。该方法利用控制点变动来获取零件边侧线上特征点的偏差，并将它们作为输入参数进行有限元分析，从而计算出最终产品变形量。通过天线表面装配的两个实例，对所提方法进行了验证。

关键词：装配变动分析；特征点；边侧线；柔性曲面；Bézier曲线

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利用微机电系统技术制作弯曲结构表面无线无源柔性加速度计 Research Article

李晨1,2,贾蔓谷1,洪应平2,薛亚楠2,熊继军2

《信息与电子工程前沿（英文）》 2022年第23卷第5期页码 801-809 doi: 10.1631/FITEE.2100236

摘要：提出一种LC无线无源柔性加速度计，解决测量弯曲结构表面加速度的困难。该加速度计由柔性聚酰亚胺（PI）衬底和平面螺旋电感（厚度为300 nm）组成，采用微机电系统（MEMS）技术，可任意弯曲或折叠，可牢固地粘附在具有弯曲结构的物体表面。利用射频无线传输原理，通过改变加速度计与天线之间的距离来测量加速度信号。与带导线的加速度计相比，该加速度计可以防止导线在振动过程中脱落，从而延长其使用寿命。通过搭建实验平台，当天线与加速度计之间的距离为5 mm时，在弯曲结构表面展示了加速度计在20至100 m/s2加速度下的传感能力。结果表明，加速度和峰峰值输出电压接近线性，加速度计灵敏度高达0.27 mV/(m•s−2)。此外，该加速度计的最大误差小于0.037%。

关键词：弯曲结构表面；柔性加速度计；微机电系统（MEMS）技术；无线非接触式测量

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电中性固体表面上多条肽链的吸附过程——粗粒化模拟研究 Research

裘若桑, 肖杰, 陈晓东

《工程（英文）》 2020年第6卷第2期页码 185-194 doi: 10.1016/j.eng.2018.12.012

摘要：

蛋白质在固体表面的吸附过程涉及诸多复杂的分子间相互作用，因此到目前为止仍然无法做到精准调控。通过模拟计算，可以获取固-液界面分子尺度的蛋白质移动机理，从而为预测蛋白质吸附和结垢现象提供可靠的理论依据。本研究通过多尺度粗粒化模型对多条疏水的丙氨酸十二肽在金表面的聚集和吸附过程进行了分析。大约有一半（46.6%）的丙氨酸十二肽可以组成聚集体。30.0%的独立肽链会被快速地吸附到固体表面。这些在表面吸附的肽链经过一段时间的爬行，其中的一些（51.0%）能与吸附在表面的或是游离在溶液中的肽链融合，从而形成吸附在表面的聚集体。这些在固-液界面吸附的肽链使得固体表面性质发生变化。这一变化可能会进一步影响之后溶液中肽链和聚集体在金表面的吸附。本研究揭示的多条肽链吸附机理有希望为进一步研究多个蛋白质分子在固体表面的吸附机理提供理论基础。

关键词：肽链聚集体吸附粗粒化计算

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任一路面上基于显式和隐式联合仿真技术的某轿车动态响应 Article

胡红舟, 钟志华

《工程（英文）》 2019年第5卷第6期页码 1171-1178 doi: 10.1016/j.eng.2019.09.003

摘要：

本文开展了将数值仿真技术用于某轿车耐久分析的研究。运用了基于显式和隐式的联合仿真，同时通过子模型技术来缩短仿真时间，使整车动态仿真时间达到基于传统有限元分析方法难以达到的低水平。联合仿真模型包含所有必要的非线性因素来保障仿真精度，所有关键件都基于变形体的定义。轮胎与路面的关系通过任一路面与轮胎的接触摩擦仿真实现。通过试验样车在6种不同路面上的仿真与测量值的对比，证明了基于显式和隐式分析的联合仿真技术具有足够的精度与仿真效率。本文同时也讨论了所采用的方法的局限性及将来可能的改进。

关键词：耐久分析动态响应显式隐式联合仿真接触分析子模型