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The Fourth World Congress of Structural and Multidisciplinary Optimization

作者： R.Ansola J.Canales J.A.Tárrago J.Rasmussen Departamento de Ingeniería Mecánica.Escuela Superior de Ingenieros de Bilbao UPV/EHU.Alda.Urquijo s/n 48013 BilbaoSpain Departamento de Ingeniería Mecánica.Escuela Superior de Ingenieros de Bilbao UPV/EHU.Alda.Urquijo s/n 48013 BilbaoSpain Departamento de Ingeniería Mecánica.Escuela Superior de Ingenieros de Bilbao UPV/EHU.Alda.Urquijo s/n 48013 BilbaoSpain institute of mechanical *** University.Pontoppidanstraede 101 DK-9220 AalborgDenmark

＜正＞The global scope of this work is to develop an integrated shape and topology optimization system for the optimum design of shell structures, which are now finding widespread use in aeronautical, automotive, civil and mechanical engineering. The proposed investigation project aims to progress on a brand new work line which has captured the mind of many researchers: the shape and topology optimization for "Computer Aided Optimal design" [1]. This project is based on the combination of shape and topology optimization techniques, with the aim of finding the optimal shape and material distribution that maximizes the stiffness of the shell. Most research in the last decades considered both optimization techniques separately, seeking an initial optimal topology and refining the shape of the solution later [2]. The method implemented in this work uses a combined approach, were the shape of the shell structure and material distribution are optimized simultaneously. This formulation involves a variable ground structure for topology optimization, since the shape of the shell is modified in the course of the process. The presented method will enhance the exploration of better designs for carrying the applied loads, due to the ability of optimizing not only the shape of the structure, but also the material distribution over the shell. This technique would provide the designer with a tool which would help to conceive the best configuration of the element considered in each situation. The method has been implemented into a general optimization software called ODESSY, developed at the institute of mechanical Engineering in Aalborg. The computational model was successfully tested in several numerical applications to illustrate and validate the approach, discussing the efficiency and feasibility of the method.

关键词： Shell structure optimization topology homogenization.

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Progress in aggregation-induced emission-active fluorescent polymeric hydrogels

Aggregate

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Aggregate 2021年第3期2卷 128-144页

作者： Wei Lu Shuxin Wei Huihui Shi Xiaoxia Le Guangqiang Yin Tao Chen Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesChinese Academy of SciencesNingbo Institute of Materials Technology and EngineeringNingboChina School of Chemical Sciences University of Chinese Academy of SciencesBeijingChina Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of TechnologyGuangzhouChina

Aggregation-induced emission(AIE)-active fluorescent polymeric hydrogels(FPHs)are the marriage of AIE-active materials and polymeric *** from the widely studied AIE-active materials that are primarily used in solution or dry solid state,they feature a three-dimensional crosslinked polymer network that can absorb water without ***,they are known to bear many advantageous properties such as soft wet nature,tissue-like mechanical strength,biocompatibility,biomimetic self-healing feature,facilely tailored structure,as well as responsive fluorescence and volume/shape changes,thus representing a promising category of luminescent materials with many frontier *** Review is intended to give a systematic summary of the recent progress in this young but flourishing research area,with particular focus on their design and *** challenges and future outlooks in this field are also discussed in order to attract new interests and inspire more efforts.

关键词： aggregation-induced emission fluorescence polymeric hydrogel

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Construction of direct Z-scheme BPQDs-modified BiOBr thin film for enhanced photocatalytic performance under visible light irradiation

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Journal of Materiomics 2021年第5期7卷 1122-1130页

作者： Ziyu Yao Huajun Sun Yunlong Hu Xiaofang Liu Yong Zhang State Key Laboratory of Silicate Materials for Architectures Center for Smart Materials and Device IntegrationSchool of Materials Science and EngineeringWuhan University of TechnologyWuhan430070China School of Chemistry Chemical Engineering and Life SciencesWuhan University of TechnologyWuhan430070China Advanced Ceramics institute of Zibo New&High-Tech Industrial Development Zone Zibo255000China

Surface modification on photocatalytic thin films is long considered as an effective strategy to improve the degradation performance,which in turn helps to alleviate the worldwide environmental pollution *** this study,a direct Z-scheme photocatalytic system is constructed successfully by integrating black phosphorus quantum dots(BPQDs)on the surface of BiOBr thin film prepared by hydrothermal *** optimal BPQDs/BiOBr-1 thin film presents remarkable enhanced photocatalytic activity for degrading methyl violet(MV)and tetracycline hydrochloride(TC),which is 3 and 3.65 times higher than that of pure BiOBr *** active species involved in the reaction are ^(+),·O_(2)^(-),and·OH,which determined by radical trapping *** formation of direct Z-scheme photocatalytic system makes electrons assembled in the conduction band(CB)of BPQDs and holes gathered in the valence band(VB)of BiOBr,which supports the generation of h^(+) and·O_(2)^(-) and in turn accelerates the photocatalytic ***,the improved efficiency of charge separation,enhanced visible light absorption and enlarged specific surface area also contributed to the enhanced photocatalytic performance of BPQDs/*** work provides a feasible strategy for optimizing photocatalytic thin films via detailed analyzing the role of BPQDs in the construction of direct Z-scheme photocatalysts.

关键词： Photocatalytic thin films Direct Z-scheme Surface modification BPQDs BiOBr

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Secondary Dendrite Arm Spacing Study of Partition in Aluminumalloy Cylinder Heads

Secondary Dendrite Arm Spacing Study of Partition in Aluminu...

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2015中国汽车工程学会年会

作者： Haisheng Mo Shuai Luo Tao Yu Tao Deng Xiaofeng Li Zhenghua Wang Yuhui Yao Daobo Fan Chunfeng Li Powertrain Testing and Prototyping Department Powertrain R＆D InstituteCHANGAN AUTO GLOBAL R＆D

This paper mainly does a research on the secondary dendrite arm spacing of the partition and the adjacent part in the same engine cylinder heads and the engine cylinder heads which passed the reliability tests under the same production *** to the analysis of the test’s conclusion,it proves that the casting process of the cylinder heads can satisfy the requirement of the design performance of the engine cylinder heads *** also analyses and judges the rationality of casting process by comparing the relationship between the secondary dendrite arm spacing and the mechanical *** essay also offers some references on the standard of the secondary dendrite arm spacing of the partition for the design of the engine cylinder heads.

关键词： aluminumalloy cylinder heads partition secondary dendrite arm spacing

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信息系统动力学的基础和应用（英文）

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Engineering 2023年第8期 254-265页

作者： Jianfeng Xu Zhenyu Liu Shuliang Wang Tao Zheng Yashi Wang Yingfei Wang Yingxu Dang Information Technology Service Center of People's Court School of Information Management for Law China University of Political Science and Law School of Computer Science and Technology Beijing Institute of Technology School of Mathematics and Statistics Beijing Institute of Technology

Although numerous advances have been made in information technology in the past decades, there is still a lack of progress in information systems dynamics(ISD), owing to the lack of a mathematical foundation needed to describe information and the lack of an analytical framework to evaluate information *** value of ISD lies in its ability to guide the design, development, application, and evaluation of largescale information system-of-systems(So Ss), just as mechanical dynamics theories guide mechanical systems engineering. This paper reports on a breakthrough in these fundamental challenges by proposing a framework for information space, improving a mathematical theory for information measurement, and proposing a dynamic configuration model for information systems. In this way, it establishes a basic theoretical framework for ISD. The proposed theoretical methodologies have been successfully applied and verified in the Smart Court So Ss Engineering Project of China and have achieved significant improvements in the quality and efficiency of Chinese court informatization. The proposed ISD provides an innovative paradigm for the analysis, design, development, and evaluation of large-scale complex information systems, such as electronic government and smart cities.

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Dynamic behavior of the Qinghai-Tibetan railway embankment in permafrost regions under trained-induced vertical loads

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research in Cold and Arid Regions 2020年第4期12卷 189-199页

作者： Tuo Chen ZhiJian Wu YanHu Mu Wei Ma JianZhou Wang State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhouJiangsu 221116China State Key Laboratory of Frozen Soil Engineering Northwest Institute of Eco-environment and ResourcesChinese Academy of SciencesLanzhouGansu 730000China School of Transportation Engineering Nanjing Tech UniversityNanjingJiangsu 210009China

The unfrozen water content and ice content of frozen soil change continuously with varying temperatures,resulting in the temperature dependence of mechanical properties of frozen *** the dynamic behavior of embankment in permafrost regions under train loading also alters with *** on a series of strong-motion tests that were carried out on the traditional embankment of Qinghai-Tibet Railway(QTR)in permafrost regions,the acceleration waveforms recorded at the embankment shoulder and slope toes were *** results show an obvious attenuation effect on the vertical train loading from road shoulder to slope ***,numerical simulations of a traditional embankment under vertical train loading in different seasons were conducted,and the dynamic behavior of the embankment was *** results show that the vibration attenuation in the cold season is greater than that in the warm *** maximum acceleration of vibration drops to about 5%when the train vibration load is transferred through the embankment into the permafrost,and the high-frequency components are absorbed when the vibration transmits ***,the dynamic stress under the dynamic train loading decreases exponentially with an increasing depth in different *** results can be a reference for design and maintenance of embankments in permafrost regions.

关键词： permafrost railway embankment numerical analysis dynamic response

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Epidermal radio frequency electronics for wireless power transfer

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Microsystems & Nanoengineering 2016年第1期2卷 52-60页

作者： Xian Huang Yuhao Liu Gil Woo Kong Jung Hun Seo Yinji Ma Kyung-In Jang Jonathan A.Fan Shimin Mao Qiwen Chen Daizhen Li Hank Liu Chuxuan Wang Dwipayan Patnaik Limei Tian Giovanni A.Salvatore Xue Feng Zhenqiang Ma Yonggang Huang John A.Rogers Department of Biomedical Engineering School of Precision Instrument and Opto-electronics EngineeringTianjin UniversityTianjin 300072China Department of Materials Science and Engineering University of Illinois at Urbana-ChampaignUrbanaIL 61801USA Department of Electrical and Computer Engineering University of Wisconsin-MadisonMadisonWI 53706USA Department of Civil and Environmental Engineering Northwestern UniversityEvanstonIL 60208USA Department of Engineering Mechanics Center for Mechanics and MaterialsTsinghua UniversityBeijing 100084China Department of mechanical Engineering Northwestern UniversityEvanstonIL 60208USA Department of Robotics Engineering Daegu Gyeongbuk Institute of Science and TechnologyDaegu 42988Republic of Korea Department of Electrical Engineering Stanford UniversityStanfordCA 94305USA

Epidermal electronic systems feature physical properties that approximate those of the skin,to enable intimate,long-lived skin interfaces for physiological measurements,human–machine interfaces and other applications that cannot be addressed by wearable hardware that is commercially available today.A primary challenge is power supply;the physical bulk,large mass and high mechanical modulus associated with conventional battery technologies can hinder efforts to achieve epidermal characteristics,and near-field power transfer schemes offer only a limited operating *** we introduce an epidermal,farfield radio frequency(RF)power harvester built using a modularized collection of ultrathin antennas,rectifiers and voltage *** components,separately fabricated and tested,can be integrated together via methods involving soft contact *** studies of the individual components and the overall performance in various dielectric environments highlight the key operational features of these systems and strategies for their *** results suggest robust capabilities for battery-free RF power,with relevance to many emerging epidermal technologies.

关键词： antenna design epidermal electronics modularization silicon nanomembrane soft-contact lamination specific absorption rate wireless power

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Thermo-mechanical Analysis of a Typical Vehicle Engine Using PTC-Creo

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Journal of mechanical Materials and Mechanics research 2022年第2期5卷 1-15页

作者： Jafar Mahmoudi Department of Sustainable Production Development School of Industrial Engineering and ManagementKTH Royal Institute of TechnologyStockholmSweden

In this work,a typical vehicle engine is modeled within PTC-Creo software,and its thermal,mechanical,and thermo-mechanical performance are *** is followed by the vibrational,fatigue,and buckling analysis of the assembly of components,which are the predominant failure caus*** results show that the least temperature gradient occurs in the center of the pin,which connects the piston to the connecting rod,the maximum displacement is seen just below the piston head,and the thermo-mechanical failure is caused mostly(about 85%)by the mechanical load rather than the thermal ***,in fatigue analysis,the minimum and maximum values for the safety factor are 0.63 and 5,*** results can prevent the reoccurrence of similar failures and help the enhancement of the components’design and manufacturing process.

关键词： Stress analysis Engine failure PTC-Creo Thermomechanical analysis

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Modeling and adaptive motion/force tracking for vertical wheel on rotating table

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Journal of Systems Science & Complexity 2015年第5期28卷 1060-1069页

作者： Zhongcai Zhang Yuqiang Wu Wei Sun School of Automation Southeast University institute of Automation Qufu Normal University

This paper is devoted to the problem of modeling and adaptive motion/force tracking for a class of nonholonomic dynamic systems with affine constraints(NDSAC): a vertical wheel on a rotating table. Prior to the development of tracking controller,the dynamic model of the wheel in question is derived in a meticulous manner. A continuously differentiable friction model is also considered in the modeling. By exploiting the inherent cascade interconnected structure of the wheel dynamics, an adaptive motion/force tracking controller is presented guaranteeing that the trajectory tracking errors asymptotically converge to zero while the contact force tracking errors can be made small enough by tuning design parameters. Simulation results are provided to validate the effectiveness of the proposed tracking methodology.

关键词：自适应跟踪运动建模垂直方向盘跟踪控制器动态模型跟踪误差

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THE STUDY OF A PIEZOELECTRIC ACCELEROMETER BASED ON D33 WORKING MODE

THE STUDY OF A PIEZOELECTRIC ACCELEROMETER BASED ON D33 WORK...

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2016年全国压电和声波理论及器件应用研讨会

作者： Hui ZHOU Ma-Hui XU Rui-Hua HAN Hang GUO Pen-Tung Sah institute of Micro-Nano Science and Technology Xiamen University College of Physical Science and Technology Xiamen University

Background, Motivation and Objective Accelerometers fabricated by MEMS technology are in high demand for application in aerospace, automobiles, military systems, and biomedical engineering field. Various acceleration sensing mechanisms have been used in accelerometers, including piezoresistive, capacitive, and piezoelectric. An external power source is required for capacitive and piezoresistive sensors, whereas piezoelectric type sensors can generate the electrical signals by directly converting the mechanical stimuli, thus their operation could consume less energy and does not even necessarily require an external power supply. Besides, piezoelectric accelerometers have a better performance over the other sensing mechanisms in temperature stability and dynamic characteristics. This feature makes piezoelectric accelerometer drawing much attention all over the world in recent years. State of Contribution/Methods Currently, piezoelectric accelerometers are mostly designed in a kind of cross-shaped cantilever structure with four suspension beams supporting a central seismic mass. Electrodes and PZT thin films are sequentially deposited on the suspension beams, forming a "sandwich structure". When the mass is subjected to inertia acceleration, it will move vertically. And the piezoelectric thin films will be deformed with the cantilever. Due to piezoelectric effect, charge can be detected from the electrodes. However, the deformation in horizontal directions is very limited, resulting in an extremely low horizontal sensitivity. In our study, a pair of interdigital electrodes is deposited on the top of the piezoelectric thin films to replace the conventional sandwich electrode configuration. In this way the PZT thin films can be polarized in in-plane direction. Analytical and numerical method has been used to study this new type of piezoelectric accelerometer. Results The design can greatly improve the voltage sensitivity from 0.012 m V/g to 4.55 m V/g for vertical direct

关键词： Piezoelectric D33 working mode Interdigital electrode

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