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Mechanics analysis of thin-walled box continuous girder with variable cross-sections in considering effect of large deflection and shear lag

Yuji CHEN, Qizhi LUO,

《结构与土木工程前沿（英文）》 2009年 第3卷 第4期   页码 352-356 doi: 10.1007/s11709-009-0057-7

摘要： In order to study the mechanics behavior of a thin-walled box continuous girder with variable cross-sections, using potential variation theories, considering the effect of shear lag of flange’s stress and the nonlinear geometry of vertical displacement, and evolving five generalized displacements with the spline function, the large deflection problem of the thin-walled box continuous girder with variable cross-section was transformed to a nonlinear algebraic equation, which was solved using the Newton-Raphon iterative method. The results of the calculation show that different shear lag warp functions to the cantilever, top and bottom plate should be taken to analyze the mechanics behavior of the thin-walled box continuous girder reliably. The thin-walled box continuous girder with variable cross-sections has more reasonable stress state and is more adaptable for the longitudinal change of internal forces than that with equal cross-sections. The effect of large deflection on the stress and displacement of the thin-walled box continuous girder with variable cross-sections depends on the values of the load.

关键词： thin-walled box girder with variable cross-sections     potential variational theory     shear lag     large deflection problem    

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Interfacial potential barrier theory of friction and wear

XU Zhongming, DING Lingyun, HUANG Ping, XU Zhongming

《机械工程前沿（英文）》 2008年 第3卷 第3期   页码 276-282 doi: 10.1007/s11465-008-0043-0

摘要： An interfacial potential barrier theory to calculate friction and wear is proposed by considering the micro interaction of frictional surfaces. The theory suggests that the performance of friction and wear depends on the magnitude and distribution of the interfacial potential barrier on contact surfaces. The calculation methods of the interfacial potential barrier and standard interfacial potential barrier are then studied and the formulas to calculate the friction force, friction coefficient, and quantity of adhesion wear are derived based on the theory. With its independence and stability, the standard interfacial potential barrier can be used as an index to describe the frictional performance of materials. The calculation results of the friction force with some existing experimental data are consistent with the experimental results performed with an ultra high vacuum atomic-force microscope, which proves that the theory and method are feasible.

关键词： coefficient     standard interfacial     interaction     formulas     calculation    

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A FEniCS implementation of the phase field method for quasi-static brittle fracture

HIRSHIKESH, Sundararajan NATARAJAN, Ratna Kumar ANNABATTULA

《结构与土木工程前沿（英文）》 2019年 第13卷 第2期   页码 380-396 doi: 10.1007/s11709-018-0471-9

摘要： In the recent years, the phase field method for simulating fracture problems has received considerable attention. This is due to the salient features of the method: 1) it can be incorporated into any conventional finite element software; 2) has a scalar damage variable is used to represent the discontinuous surface implicitly and 3) the crack initiation and subsequent propagation and branching are treated with less complexity. Within this framework, the linear momentum equations are coupled with the diffusion type equation, which describes the evolution of the damage variable. The coupled nonlinear system of partial differential equations are solved in a ‘staggered’ approach. The present work discusses the implementation of the phase field method for brittle fracture within the open-source finite element software, FEniCS. The FEniCS provides a framework for the automated solutions of the partial differential equations. The details of the implementation which forms the core of the analysis are presented. The implementation is validated by solving a few benchmark problems and comparing the results with the open literature.

关键词： phase field method     FEniCS     brittle fracture     crack propagation     variational theory of fracture    

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Variational mode decomposition based modal parameter identification in civil engineering

Mingjie ZHANG, Fuyou XU

《结构与土木工程前沿（英文）》 2019年 第13卷 第5期   页码 1082-1094 doi: 10.1007/s11709-019-0537-3

摘要： An out-put only modal parameter identification method based on variational mode decomposition (VMD) is developed for civil structure identifications. The recently developed VMD technique is utilized to decompose the free decay response (FDR) of a structure into to modal responses. A novel procedure is developed to calculate the instantaneous modal frequencies and instantaneous modal damping ratios. The proposed identification method can straightforwardly extract the mode shape vectors using the modal responses extracted from the FDRs at all available sensors on the structure. A series of numerical and experimental case studies are conducted to demonstrate the efficiency and highlight the superiority of the proposed method in modal parameter identification using both free vibration and ambient vibration data. The results of the present method are compared with those of the empirical mode decomposition-based method, and the superiorities of the present method are verified. The proposed method is proved to be efficient and accurate in modal parameter identification for both linear and nonlinear civil structures, including structures with closely spaced modes, sudden modal parameter variation, and amplitude-dependent modal parameters, etc.

关键词： modal parameter identification     variational mode decomposition     civil structure     nonlinear system     closely spaced modes    

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Stability analysis of slopes with planar failure using variational calculus and numerical methods

Norly BELANDRIA, Roberto ÚCAR, Francisco M. LEÓN, Ferri HASSANI

《结构与土木工程前沿（英文）》 2020年 第14卷 第5期   页码 1262-1273 doi: 10.1007/s11709-020-0657-9

摘要： This study investigates the technique of variational calculus applied to estimate the slope stability considering the mechanism of planar failure. The critical plane failure surface should be determined because it theoretically indicates the most unfavorable plane to be considered when stabilizing a slope to rectify the instability generated by several statistically possible planes. This generates integrals that can be solved by numerical methods, such as the Newton Cotes and the finite differences methods. Additionally, a system of nonlinear equations is obtained and solved. The surface of the critical planar failure is determined by applying the condition of transversality in mobile boundaries, for which various examples are provided. The number of slices is varied in one of the examples, while the surface of the critical planar failure is determined in the others. Results are compared using analytical methods through axis rotations. All the results obtained by considering normal stress, safety factors, and critical planar failure are nearly the same; however, in this research, a study is carried out for “ ” number of slices using programming methods. Sub-routines are important because they can be applied in slopes with different geometry, surcharge, interstitial pressure, and pseudo-static load.

关键词： slopes stability     planar failure     variational calculus     numerical methods    

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流域清洁生产及其潜力分析方法研究

谢明辉,乔琦,孙启宏

《中国工程科学》 2013年 第15卷 第3期   页码 70-79

摘要：

运用清洁生产的基本原理与方法，在兼具工业生态学理论、循环经济理论、可持续发展理论、系统论等理论基础上，结合我国清洁生产实践要求，将清洁生产的实施层次由企业内部提升为流域层次，探讨了流域清洁生产的理论基础，构建了基于系统动力学的流域清洁生产潜力分析方法。以辽河流域为案例，较系统地分析了该流域的清洁生产潜力，计算了流域清洁生产对于减排的贡献，并基于以上结果提出了辽河流域清洁生产的总体行动路线。

关键词： 流域清洁生产     潜力     系统动力学    

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基于变分贝叶斯多稀疏成分提取的空间碎片超高速撞击损伤重构方法研究 Research Article

黄雪刚,石安华,罗庆,罗锦阳

《信息与电子工程前沿（英文）》 2022年 第23卷 第4期   页码 530-541 doi: 10.1631/FITEE.2000575

摘要： 为提高在轨航天器抵御空间碎片撞击的生存能力，提出一种撞击损伤评估方法。首先，建立一个针对红外热图像序列数据的多区域损伤挖掘模型，用于描述处于不同空间层的撞击损伤。采用变分贝叶斯推理来求解模型参数，从而有效地从红外热图像数据中识别不同类型撞击损伤。然后，提出一种图像处理框架，包括具有能量函数的图像分割算法和具有稀疏表示的图像融合方法，以消除变异贝叶斯误差并比较不同类型损伤的位置。在试验部分，将上述方法用于评估二次碎片云对Whipple防护结构的复杂撞击损伤。实验结果证明本文提出的方法可以对空间碎片超高速撞击造成的不同类型复杂损伤进行有效识别与评估。

关键词： 超高速撞击；变分贝叶斯；稀疏表示；损伤评估    

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21世纪电子学的若干前沿课题

黄志询

《中国工程科学》 2000年 第2卷 第5期   页码 21-27

摘要：

文章讨论了进入21世纪时物理学和电子学的现状和若干前沿课题，涉及真空能、电子负质量、量子势、虚粒子、超弦理论、快子，以及EPR思维实验、量子交缠与量子远距传物、量子信息学、量子计算机等方面的最新研究进展与成果。

关键词： 真空能     负质量     量子势     虚粒子     快子     量子交缠     量子信息学     量子计算    

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细水雾作用下烟颗粒形貌及尺寸变化规律研究

房玉东

《中国工程科学》 2014年 第16卷 第2期   页码 93-100

摘要：

利用Sirion200 型场发射扫描电子显微镜拍摄细水雾作用前后柴油和聚氯乙烯（PVC）材料烟颗粒的形貌和内部结构图像。定义了烟颗粒的采样平均直径（dA）和表面密度（ρS），利用统计分析的方法计算了细水雾作用前后烟颗粒的dA和ρS，研究了采样点空间位置、细水雾工作压力、雾滴粒径和雾滴速度等因素对dA和ρS的影响规律，揭示了细水雾冲刷火灾烟颗粒的主导机理，为细水雾技术用于计算机房等电气环境的火灾烟气抑制提供了科学的参考依据。

关键词： 细水雾     烟颗粒     表面密度     采样平均直径    

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A novel hybrid model for water quality prediction based on VMD and IGOA optimized for LSTM

《环境科学与工程前沿（英文）》 2023年 第17卷 第7期 doi: 10.1007/s11783-023-1688-y

摘要：

● A novel VMD-IGOA-LSTM model has proposed for the prediction of water quality.

关键词： Water quality prediction     Grasshopper optimization algorithm     Variational mode decomposition     Long short-term memory neural network    

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解读建筑理论

顾孟潮

《中国工程科学》 2007年 第9卷 第11期   页码 100-102

摘要：

从解读建筑理论的定义与概念入手，对有中国特色的建筑理论框架及建筑理论的创新等问题提出 了自己的见解。

关键词： 建筑理论     建筑理论框架     建筑理论纵横框架     建筑理论的起点和终点     建筑理论创新    

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Usability perceptions and beliefs about smart thermostats by chi-square test, signal detection theory, and fuzzy detection theory in regions of Mexico

Pedro PONCE, Therese PEFFER, Arturo MOLINA

《能源前沿（英文）》 2019年 第13卷 第3期   页码 522-538 doi: 10.1007/s11708-018-0562-2

摘要： It is well known that smart thermostats (STs) have become key devices in the implementation of smart homes; thus, they are considered as primary elements for the control of electrical energy consumption in households. Moreover, energy consumption is drastically affected when the end users select unsuitable STs or when they do not use the STs correctly. Furthermore, in future, Mexico will face serious electrical energy challenges that can be considerably resolved if the end users operate the STs in a correct manner. Hence, it is important to carry out an in-depth study and analysis on thermostats, by focusing on social aspects that influence the technological use and performance of the thermostats. This paper proposes the use of a signal detection theory (SDT), fuzzy detection theory (FDT), and chi-square (CS) test in order to understand the perceptions and beliefs of end users about the use of STs in Mexico. This paper extensively shows the perceptions and beliefs about the selected thermostats in Mexico. Besides, it presents an in-depth discussion on the cognitive perceptions and beliefs of end users. Moreover, it shows why the expectations of the end users about STs are not met. It also promotes the technological and social development of STs such that they are relatively more accepted in complex electrical grids such as smart grids.

关键词： thermostats     perceptions     beliefs     signal detection theory (SDT)     fuzzy signal detection theory (FSDT)     chi-square (CS) test    

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Energy neutrality potential of wastewater treatment plants: A novel evaluation framework integrating

《环境科学与工程前沿（英文）》 2022年 第16卷 第9期 doi: 10.1007/s11783-022-1549-0

摘要：

• Framework of indicators was established based on energy efficiency and recovery.

关键词： Wastewater treatment plants     Energy neutrality potential     Energy efficiency     Energy recovery     Evaluation framework    

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知行学引论——信息 知识 智能的统一理论

钟义信

《中国工程科学》 2004年 第6卷 第6期   页码 1-8

摘要：

资源乃人类生存之源。科学技术的任务就要揭示资源的性质及其转换规律，以创造先进工具，扩展人的能力，改善人类的生存发展条件。近代科学揭示了物质和能量两类资源的性质和转换规律，创造和不断改进了人力工具和动力工具，创造了辉煌的工业时代文明：文章试图总结信息资源的性质及其转换规律，阐明信息—知识—智能的统一理论，构建知行学，为创造各种智能工具奠定理论基础。

关键词： 信息论     知识论     智能论     知行学    

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Global warming potential associated with Irish milk powder production

William Finnegan, Jamie Goggins, Aksana Chyzheuskaya, Xinmin Zhan

《环境科学与工程前沿（英文）》 2017年 第11卷 第3期 doi: 10.1007/s11783-017-0949-z

摘要： Climate change is an ever growing issue and a major concern worldwide. Both producers and processors need to address the issue now by reducing their carbon footprint. Additionally, if Ireland is to meet their climate and energy targets, as outlined in Food Harvest 2020, which outlines a range of objectives for the Irish agricultural sector, the efficient use of resources and fuels within the industry will need to be increased. In Ireland, agriculture accounts for 29.2% of the total greenhouse gas emissions (58.5 million tonnes CO eq). Therefore, in this paper, a single agri-food product, milk powder, is examined in order to estimate the global warming potential (GWP) associated with its manufacture using life cycle assessment. A cradle-to-processing factory gate analysis, which includes raw milk production, raw milk transportation to the processing factory, its processing into each product and product packaging, is assessed in this study using data collected circa 2013. The factories surveyed processed approximately 24% of the total raw milk processed in the Republic of Ireland in 2013, which was 5.83 billion liters. The average total GWP associated with the manufacture of milk powder is 9.731 kg CO eq·kg milk powder, which has a standard deviation of 2.26 kg CO eq·kg milk powder, for the life cycle stages analyzed in this study. The most significant contributor to GWP is raw milk production (84%), followed by dairy processing (14%), with the remainder of the life cycle stages contributing approximately 2%.

关键词： Dairy     Global warming potential     Ireland     Life cycle assessment     Milk powder     Milk production    

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标题 作者 时间 类型 操作

Mechanics analysis of thin-walled box continuous girder with variable cross-sections in considering effect of large deflection and shear lag

Yuji CHEN, Qizhi LUO,

期刊论文

Interfacial potential barrier theory of friction and wear

XU Zhongming, DING Lingyun, HUANG Ping, XU Zhongming

期刊论文

A FEniCS implementation of the phase field method for quasi-static brittle fracture

HIRSHIKESH, Sundararajan NATARAJAN, Ratna Kumar ANNABATTULA

期刊论文

Variational mode decomposition based modal parameter identification in civil engineering

Mingjie ZHANG, Fuyou XU

期刊论文

Stability analysis of slopes with planar failure using variational calculus and numerical methods

Norly BELANDRIA, Roberto ÚCAR, Francisco M. LEÓN, Ferri HASSANI

期刊论文

流域清洁生产及其潜力分析方法研究

谢明辉,乔琦,孙启宏

期刊论文

基于变分贝叶斯多稀疏成分提取的空间碎片超高速撞击损伤重构方法研究

黄雪刚,石安华,罗庆,罗锦阳

期刊论文

21世纪电子学的若干前沿课题

黄志询

期刊论文

细水雾作用下烟颗粒形貌及尺寸变化规律研究

房玉东

期刊论文

A novel hybrid model for water quality prediction based on VMD and IGOA optimized for LSTM

期刊论文

解读建筑理论

顾孟潮

期刊论文

Usability perceptions and beliefs about smart thermostats by chi-square test, signal detection theory, and fuzzy detection theory in regions of Mexico

Pedro PONCE, Therese PEFFER, Arturo MOLINA

期刊论文

Energy neutrality potential of wastewater treatment plants: A novel evaluation framework integrating

期刊论文

知行学引论——信息 知识 智能的统一理论

钟义信

期刊论文

Global warming potential associated with Irish milk powder production

William Finnegan, Jamie Goggins, Aksana Chyzheuskaya, Xinmin Zhan

期刊论文