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Surface evolution caused by curvature driven forces based on natural exponential pair potential

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Acta Mechanica Sinica 2019年第2期35卷 445-456页

作者： Dan Wang Yajun Yin zheng {1. Zhu Su Zhili Hu State key laboratory of mechanics and control of mechanical structures College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics Nanjing 211100 China Department of engineering {1. School of Aerospace Tsinghua University Beijing 100084 China school of {1. engineering and applied mechanics Tongji University Shanghai 200092 China

Based on the natural exponential pair potential, the interaction potential between curved surface body and on surface particle is studied. Firstly, the interaction potential is written as a function of curvatures through the differential geometry. Secondly, idealized numerical experiments are designed to test the accuracy of curvature-based potential. Then, the driving forces induced by curvatures are analyzed, which confirms that micro/nano curved surface body can induce driving forces, curvatures and the gradient of curvatures are the essential elements forming the driving forces. Finally, by combing with the curvature based potential and driving forces, the movements of on surface particles and the evolution of surface morphology of curved surface body are predicted.

关键词： Curvature-based potential Curvatures and the gradient of curvatures Driving forces Surface morphology evolution

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褶皱幅度对仿生翼型滑翔气动特性的影响

力学季刊 2018年第1期39卷 22-32页

作者：张子龙殷雅俊仲政赵红晓同济大学航空航天与力学学院上海200092 清华大学航天航空学院北京100084

蜻蜓翅膀具有独特的褶皱状形貌.研究者们致力于利用仿生学原理,设计在低雷诺数条件下具有更优气动性能的褶皱翼型.本文采用计算流体力学方法,求解二维不可压Navier-Stokes方程组,探讨了四种翼型(平板翼型、流线翼型、小幅度褶皱翼型和... 详细信息

蜻蜓翅膀具有独特的褶皱状形貌.研究者们致力于利用仿生学原理,设计在低雷诺数条件下具有更优气动性能的褶皱翼型.本文采用计算流体力学方法,求解二维不可压Navier-Stokes方程组,探讨了四种翼型(平板翼型、流线翼型、小幅度褶皱翼型和大幅度褶皱翼型)的气动表现.在低雷诺数条件下得到以下结果:(1.较小幅度的褶皱结构有利于增加升力和减小阻力;(2)雷诺数变化时褶皱翼型的升力系数呈非线性变化,在特定雷诺数区间,幅度相近的褶皱翼型会发生相对气动优势的转变;(3)褶皱结构内的回流区通过减小粘性阻力,使得翼型总阻力下降;(4)翼型前缘的极小区域会产生脉冲高升力,对升力表现产生较大影响.这些结果表明,调整褶皱幅度是实现褶皱翼型气动优化的有效方案.

关键词：蜻蜓翅膀褶皱翼型幅度低雷诺数计算流体力学

基于电-化-热耦合理论对称双阴极固体氧化物燃料电池堆的电流与温度场数值模拟

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电化学 2020年第6期26卷 789-796页

作者：俞成荣朱建国蒋聪盈谷宇晨周晔欣李卓斌邬荣敏仲政官万兵江苏大学土木工程与力学学院江苏镇江212013 中国科学院宁波材料技术与工程研究所浙江宁波315201 同济大学航空航天工程与力学学院上海200092 哈尔滨工业大学(深圳)理学院广东深圳518055 浙江浙能技术研究院有限公司浙江杭州311121

本文基于电-化-热多场耦合理论,通过有限元方法建立了一个基于对称双阴极结构SOFC电堆单元的三维数值模型,研究了其电堆内部的电流密度分布和温度分布.研究结果表明,气体流动方式以及集流方式影响了电解质上电流密度和温度分布:在气体... 详细信息

本文基于电-化-热多场耦合理论,通过有限元方法建立了一个基于对称双阴极结构SOFC电堆单元的三维数值模型,研究了其电堆内部的电流密度分布和温度分布.研究结果表明,气体流动方式以及集流方式影响了电解质上电流密度和温度分布:在气体进、出气口处有较大的电流密度分布;在气体共流模式下,电解质层温度分布却较均匀;在双阴极结构电池阴极侧的单一集流模式下,集流侧的电解质的平均电流密度高于另一侧.

关键词：对称双阴极固体氧化物燃料电池多场耦合共流与逆流集流

CEPC Technical Design Report

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Radiation Detection Technology and Methods 2024年第1期8卷 I0003-I0016,1-1091页

作者： Waleed Abdallah Tiago Carlos Adorno de Freitas Konstantin Afanaciev Shakeel Ahmad Ijaz Ahmed Xiaocong Ai Abid Aleem Wolfgang Altmannshofer Fabio Alves Weiming An Rui An Daniele Paolo Anderle Stefan Antusch Yasuo Arai Andrej Arbuzov Abdesslam Arhrib Mustafa Ashry Sha Bai Yu Bai Yang Bai Vipul Bairathi Csaba Balazs Philip Bambade Yong Ban Tripamo Bandyopadhyay Shou-Shan Bao Desmond P.Barber Ayse Bat Varvara Batozskaya Subash Chandra Behera Alexander Belyaev Michele Bertucci Xiao-Jun Bi Yuanjie Bi Tianjian Bian Fabrizio Bianchi Thomas Biekotter Michela Biglietti Shalva Bilanishvili Deng Binglin Denis Bodrov Anton Bogomyagkov Serge Bondarenko Stewart Boogert Maarten Boonekamp Marcello Borri Angelo Bosotti Vincent Boudry Mohammed Boukidi Igor Boyko Ivanka Bozovic Giuseppe Bozzi Jean-Claude Brient Anastasiia Budzinskaya Masroor Bukhari Vladimir Bytev Giacomo Cacciapaglia Hua Cai Wenyong Cai Wujun Cai Yijian Cai Yizhou Cai Yuchen Cai Haiying Cai Huacheng Cai Lorenzo Calibbi Junsong Cang Guofu Cao Jianshe Cao Antoine Chance Xuejun Chang Yue Chang Zhe Chang Xinyuan Chang Wei Chao Auttakit Chatrabhuti Yimin Che Yuzhi Che Bin Chen Danping Chen Fuqing Chen Fusan Chen Gang Chen Guoming Chen Hua-Xing Chen Huirun Chen Jinhui Chen Ji-Yuan Chen Kai Chen Mali Chen Mingjun Chen Mingshui Chen Ning Chen Shanhong Chen Shanzhen Chen Shao-Long Chen Shaomin Chen Shiqiang Chen Tianlu Chen Wei Chen Xiang Chen Xiaoyu Chen Xin Chen Xun Chen Xurong Chen Ye Chen Ying Chen Yukai Chen Zelin Chen Zilin Chen Gang Chen Boping Chen Chunhui Chen Hok Chuen cheng Huajie cheng Shan cheng Tongguang cheng Yunlong Chi Pietro Chimenti Wen Han Chiu Guk Cho Ming-Chung Chu Xiaotong Chu Ziliang Chu Guglielmo Coloretti Andreas Crivellin Hanhua Cui Xiaohao Cui Zhaoyuan Cui Brunella D'Anzi Ling-Yun Dai Xinchen Dai Xuwen Dai Antonio De Maria Nicola De Filippis Christophe De La Taille Francesca De Mori Chiara De Sio Elisa Del Core Shuangxue Deng Wei-Tian Deng Zhi Deng Ziyan Deng Bhupal Dev Tang Dewen Biagio Di Micco Ran Ding Siqin Dingl Yadong Ding Haiyi Dong Jianin AGH university of Science and Technology Faculty of Physics and Applied Computer ScienceKrakow Anhui university HefeiAnhui applied Physics Department Federal Urdu University of ArtsScience and TechnologyIslamabad Banaras Hindu university Institute of ScienceVaranasi Bandirma Onyedi Eylul university Bandirma Beihang university Beijing Beijing Computational Science Research Center Beijing Beijing Conveyi LTD Beijing Beijing Glass Research Institute Co. LtdBeijing Beijing Institute of Technology Beijing Beijing Normal university Beijing Brown university ProvidenceRI Budker Institute of Nuclear Physics Novosibirsk Cadi Ayyad university Laboratory of Fundamental and Applied PhysicsPolydisciplinary FacultyMarrakech Cairo university Giza Center for Theory and Computation National Tsing Hua UniversityHsinchu Central china Normal {1. WuhanHubei Central South university ChangshaHunan Centro de Fisica Teorica de Particulas Universidade Tecnica de LisboaLisboa chengdu KaitengSifang Digital Radio&TV Equipment Co. LtdChengduSichuan china academy of {1. physics MianyangSichuan china building materials academy Beijing china Center of Advanced Science and Technology Beijing china Institute of Atomic Energy Beijing china Jiliang {1. HangzhouZhejiang china Nuclear Instrument CO. LTDBeijing china {1. of Geosciences Beijing china {1. of Geosciences WuhanHubei china {1. of Mining and Technology XuzhouJiangsu china West Normal {1. NanchongSichuan Chongqing university Department of PhysicsChongqing Chulalongkorn university Bangkok City university of Hong Kong Department of PhysicsHong Kong Cockcroft Institute Daresbury Cornell university IthacaNY CPPM(AMU/IPhU&CNRS/INP) Marseille Dalian Minzu university DalianLiaoning Dalian university of Technology Department of PhysicsDalian Deutsches Elektronen-Synchrotron DESY Hamburg Dzhelepov Laboratory of Nuclear Problems of Joint Institute for Nuclear Research(DLNP JINR) Dubna East china {1. Of Science And Technol

The Circular Electron Positron Collider(CEPC)is a large scientific project initiated and hosted by china,fostered through extensive collaboration with international *** complex comprises four accelerators:a 30 GeV Linac,a 1.1.GeV Damping Ring,a Booster capable of achieving energies up to 1.0 GeV,and a Collider operating at varying energy modes(Z,W,H,and tt).The Linac and Damping Ring are situated on the surface,while the subterranean Booster and Collider are housed in a 1.0 km circumference underground tunnel,strategically accommodating future expansion with provisions for a potential Super Proton Proton Collider(SPPC).The CEPC primarily serves as a Higgs *** its baseline design with synchrotron radiation(SR)power of 30 MW per beam,it can achieve a luminosity of 5×1.^(34)cm^(-2)s^(-1.per interaction point(IP),resulting in an integrated luminosity of 1. ab^(-1.for two IPs over a decade,producing 2.6 million Higgs *** the SR power to 50 MW per beam expands the CEPC's capability to generate 4.3 million Higgs bosons,facilitating precise measurements of Higgs coupling at sub-percent levels,exceeding the precision expected from the HL-LHC by an order of *** Technical Design Report(TDR)follows the Preliminary Conceptual Design Report(Pre-CDR,201.)and the Conceptual Design Report(CDR,201.),comprehensively detailing the machine's layout,performance metrics,physical design and analysis,technical systems design,R&D and prototyping efforts,and associated civil {1. ***,it includes a cost estimate and a preliminary construction timeline,establishing a framework for forthcoming {1. design phase and site selection *** is anticipated to begin around 2027-2028,pending government approval,with an estimated duration of 8 *** commencement of experiments and data collection could potentially be initiated in the mid-2030s.

关键词： initiated exceeding precise

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MEMS应变传感器测量误差分析

仪表技术与传感器 2020年第7期 17-22,37页

作者：吴入军张晓峰陈田马雪芬于忠海郑百林上海电机学院机械学院上海201306 同济大学航空航天与力学学院上海200092

由于MEMS传感器基片与基体并不接触,基体应变并不能准确地传递到MEMS传感器基片上,造成MEMS应变传感器的测量应变与基体的真实应变有一定的误差。为进一步提高MEMS测量应变的精度,利用考虑剪滞效应的弹性理论研究MEMS传感器应变传递机理... 详细信息

由于MEMS传感器基片与基体并不接触,基体应变并不能准确地传递到MEMS传感器基片上,造成MEMS应变传感器的测量应变与基体的真实应变有一定的误差。为进一步提高MEMS测量应变的精度,利用考虑剪滞效应的弹性理论研究MEMS传感器应变传递机理,建立力学模型,得出测量应变与基体真实应变之间的关系;最后分析了传感器基片、粘结层和基体对灵敏度系数的影响。结果表明:灵敏度系数随着传感器基底厚度和弹性模量的增大而逐渐减小;随着粘结层厚度的减小、弹性模量的增大而逐渐增大;随着基体刚度的增大而逐渐增大。通过对MEMS应变传感器应变传递机理的分析,对MEMS传感器的设计和使用提供一定的参考。

关键词： MEMS应变传感器应变传递切应力