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Experimental and numerical study on hysteretic performance of SMA spring-friction bearings

Earthquake Engineering and Engineering Vibration 2016年第4期15卷 597-609页

作者： zhuang peng Xue Suduo Nie Pan Wang Wenting School of Civil and Transportation Engineering Beijing University of Civil Engineering and Architecture Beijing Higher Institution Engineering Research Center of Structural Engineering and New Materials Beijing University of Civil Engineering and Architecture College of Architecture and Civil Engineering Beijing University of Technology

This paper presents an experimental and numerical study to investigate the hysteretic performance of a new type of isolator consisting of shape memory alloy springs and friction bearing called an SMA spring-friction bearing （SFB）. The SFB is a sliding-type isolator with SMA devices used for the seismic protection of engineering structures. The principle of operation of the isolation bearing is introduced. In order to explore the possibility of applying SMA elements in passive seismic control devices, large diameter superelastic tension/compression NiTi SMA helical springs used in the SFB isolator were developed. Mechanical experiments of the SMA helical spring were carried out to understand its superelastic characteristics. After that, a series of quasi-static tests on a single SFB isolator prototype were conducted to measure its force-displacement relationships for different loading conditions and study the corresponding variation law of its mechanical performance. The experimental results demonstrate that the SFB exhibits full hysteretic curves, excellent energy dissipation capacity, and moderate recentering ability. Finally, a theoretical model capable of emulating the hysteretic behavior of the SMA-based isolator was then established and implemented in MATLAB software. The comparison of the numerical results with the experimental results shows the efficacy of the proposed model for simulating the response of the SFB.

关键词： sliding isolation bearing SMA helical spring hysteretic performance quasi-static test theoretical model

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A Self-consistent Treatment of Disoriented Chiral Condensates

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Chinese Physics Letters 1998年第10期15卷 708-710页

作者： zhuang peng-fei Rolf Fauser Department of Physics Tsinghua UniversityBeijing 100084 Theoretical Physics Group Gesellschaft fr Schwerionenforschung GSID-64291 DarmstadtGermany

A system with disoriented chiral condensates(DCCs)is considered in the presence of residual thermal pion *** self-consistently solving the coupled equations for the condensates,the thermal pion distributions,and the s... 详细信息

关键词： neutral Chiral thermal

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Equal-Time Transport Theory for Scalar Particles with Width

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Chinese Physics Letters 1999年第5期16卷 330-332页

作者： zhuang peng-fei Rolf Fauser Department of Physics Tsinghua UniversityBeijing 100084 Theoretical Physics Group Gesellschaft für Schwerionenforschang GSID-64291 DarmstadtGermany

For a Ф^(4)-theory the equal-time transport theory is derived with a collision term by including 4-point *** aћexpansion a set of coupled equations is presented for the first three energy moments of the Wigner functions and the 4-point *** presence of 4-point *** limit n→0 is *** the collision term leads already in this limit to particles with width.

关键词： limit collision theory

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Facial optical flow estimation via neural non-rigid registration

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Computational Visual Media 2023年第1期9卷 109-122页

作者： zhuang peng Boyi Jiang Haofei Xu Wanquan Feng Juyong Zhang School of Mathematical Sciences University of Science and Technology of ChinaHefei 230026China

Optical flow estimation in human facial video,which provides 2D correspondences between adjacent frames,is a fundamental pre-processing step for many applications,like facial expression capture and ***,it is quite challenging as human facial images contain large areas of similar textures,rich expressions,and large *** characteristics also result in the scarcity of large,annotated realworld *** propose a robust and accurate method to learn facial optical flow in a self-supervised ***,we utilize various shape priors,including face depth,landmarks,and parsing,to guide the self-supervised learning task via a differentiable nonrigid registration *** experiments demonstrate that our method achieves remarkable improvements for facial optical flow estimation in the presence of significant expressions and large rotations.

关键词： human face optical flow self-supervised non-rigid registration neural networks facial priors

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Dissociation Temperature of Strictly Confined Charmonium States

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Chinese Physics Letters 2012年第3期29卷 59-62页

作者： QU Zhen LIU Yun-peng zhuang peng-Fei Department of Physics Tsinghua UniversityBeijing 100084

We study the dissociation of strictly confined charmonium states at finite *** strict confinement constraint to the Cornell potential leads to a 10%higher J/(φ)dissociation temperature and in turn a weaker J/(φ)supp... 详细信息

关键词： temperature dissociation strictly

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Volume Effect of Bound States in Quark-Gluon Plasma

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Communications in Theoretical Physics 2006年第6X期46卷 1040-1046页

作者： MAIO Hong GAO Chong-Shou zhuang peng-Fei Physics Department Tsinghua University Beijing 100084 China School of Physics Peking University Beijing 100871 China Institute of Theoretical Physics Academia Sinica Beijing 100080 China

Bound states, such as qq and q^-q, may exist the volume of the bound states may evoke a reduction in investigate qualitatively the volume effect on the properties states start to be completely melted.

关键词： QGP equationof state diquark bag model volume effect

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Sigma Decay at Finite Temperature and Density

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Chinese Physics Letters 2001年第3期18卷 344-346页

作者： zhuang peng-Fei YANG Zhen-Wei Department of Physics Tsinghua UniversityBeijing 100084

Sigma decay and its relation with chiral phase transition are discussed at finite temperature and density in the framework of the Nambu-Jona-Lasinio *** decay rate for the processσ→2πto first order in 1/Nc(inverse number of colors)expansion is calculated as a function of temperature T and baryon density *** particular,only when the chiral phase transition happens around the tricritical point,theσdecay results in a non-thermal enhancement of pions in the final state distributions in relativistic heavy ion collisions.

关键词： decay chiral transition

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Meson Effects on the Chiral Condensate at Finite Density

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Communications in Theoretical Physics 2002年第8期38卷 181-184页

作者： HUANG Mei zhuang peng-Fei ZHAO Wei-Qin Physics Department Tsinghua University Beijing 100084 China CCAST (World Laboratory) P.O. Box 8730 Beijing 100080 China Physics Department Tsinghua University Beijing 100084 China CCAST (World Laboratory) P.O. Box 8730 Beijing 100080 China Institute of High Energy Physics the Chinese Academy of Sciences Beijing 100039 China

Meson corrections on the chiral condensate up to next-to-leading order in a 1/Nc expansion at finite densityare investigated in the NJL model with explicit chiral symmetry breaking. Compared with mean-field results, the chiralphase transition is still of the first order while the properties near the critical density for chiral phase transition are foundto change significantly.

关键词： meson corrections, chiral condensate

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Seismic isolation analysis of FPS bearings in spatial lattice shell structures

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Earthquake Engineering and Engineering Vibration 2010年第1期9卷 93-102页

作者： Yong-Chul Kim Xue Suduo zhuang peng Zhao Wei Li Chenghao Dongyang Structure Engineering Co. Ltd. Tanbang-dong 1014 Seo-gu Daejeon Korea 302-223 College of Architecture and Civil Engineering Beijing University of Technology Beijing 100124 China College of Civil and Traffic Engineering Beijing University of Civil Engineering and Architecture Beijing 100044 China Beijing Urban Engineering Design ＆ Research Institute Co. Ltd. Beijing 100037 China

A theoretical model of a friction pendulum system （FPS） is introduced to examine its application for the seismic isolation of spatial lattice shell structures. An equation of motion of the lattice shell with FPS bearings is developed. Then, seismic isolation studies are performed for both double-layer and single-layer lattice shell structures under different seismic input and design parameters of the FPS. The influence of frictional coefficients and radius of the FPS on seismic performance are discussed. Based on the study, some suggestions for seismic isolation design of lattice shells with FPS bearings are given and conclusions are made which could be helpful in the application of FPS.

关键词： seismic isolation friction pendulum system spatial structure lattice shell parameter analysis

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Study on precision dicing process of SiC wafer with diamond dicing blades

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Nanotechnology and Precision Engineering 2021年第3期4卷 45-53页

作者： Xue Wang Zewei Yuan peng zhuang Tianzheng Wu Shuang Feng School of Mechanical Engineering Shenyang University of TechnologyShenyang 110870China

An innovative method for high-speed micro-dicing of SiC has been proposed using two types of diamond dicing blades,a resin-bonded dicing blade and a metal-bonded dicing *** experimental research investigated the radial wear of the dicing blade,the maximum spindle current,the surface morphology of the SiC die,the number of chips longer than 10μm,and the chipped area,which depend on the dicing process parameters such as spindle speed,feed speed,and cutting *** chipping fractures in the SiC had obvious brittle fracture *** performance of the metal-bonded dicing blade was inferior to that of the resin-bonded dicing *** cutting depth has the greatest influence on the radial wear of the dicing blade,the maximum spindle current,and the damage to the SiC *** next most important parameter is the feed *** parameter with the least influence is the spindle *** main factor affecting the dicing quality is blade vibration caused by spindle *** optimal SiC dicing was for a resin-bonded dicing blade with a spindle speed of 20000 rpm,a feed speed of 4 mm/s,and a cutting depth of 0.1 *** improve dicing quality and tool performance,spindle vibrations should be *** approach may enable high-speed dicing of SiC wafers with less dicing damage.

关键词： Micro-dicing Silicon carbide Dicing blade Dicing process Diamond abrasive Low-damage surface integrity

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