|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Flow-induced vibrations of long circular cylinders modeled by coupled nonlinear oscillators显示文摘The dynamics of long slender cylinders undergoing vortex-induced vibrations (VIV) is studied in this work. Long slender cylinders such as risers or tension legs are widely used in the field of ocean engineering. When the sea current flows past a cylinder, it will be excited due to vortex shedding. A three-dimensional time domain model is formulated to describe the response of the cylinder, in which the in-line (IL) and cross-flow (CF) deflections are coupled. The wake dynamics, including in-line and cross-flow vibrations, is represented using a pair of non-linear oscillators distributed along the cylinder. The wake oscillators are coupled to the dynamics of the long cylinder with the acceleration coupling term. A non-linear fluid force model is accounted for to reflect the relative motion of cylinder to current. The model is validated against the published data from a tank experiment with the free span riser. The comparisons show that some aspects due to VIV of long flexible cylinders can be reproduced by the proposed model, such as vibrating frequency, dominant mode number, occurrence and transition of the standing or traveling waves. In the case study, the simulations show that the IL curvature is not smaller than CF curvature, which indicates that both IL and CF vibrations are important for the structural fatigue damage. | GE Fei LONG Xu WANG Lei HONG YouShi | 2009 | Science China(Physics,Mechanics & Astronomy)2009，52，7： | 20 |
| 2 | EFFECTS OF SPLITTER BLADES ON THE LAW OF INNER FLOW WITHIN CENTRIFUGAL PUMP IMPELLER显示文摘有 splitter 片的离心的泵 impeller 的内部流动地上的分析被数字模拟执行。把分析基于这,增加泵头和效率的原则被讨论。新结果从骚乱动能和相对速度分发的分析被获得:第一, splitter 片的无理的长度或偏差设计可以在 impeller 隧道引起大狂暴的变化,它在 impeller 插头流动的稳定性上有大效果;第二,流动分离的出现能被减少或从片装载的分析与 splitter 推迟了片,这被发现;第三,改革“喷气醒来”的结构上的 splitter 片的效果在不同流动剖面图从相对速度分发被解释,它在 impeller 显示出流动过程。内部流动分析验证表演测试结果和 PIV 测试的结果。 | YUAN Shouqi ZHANG Jinfeng YUAN Jianping HE Youshi FU Yuedeng | 2007 | Chinese Journal of Mechanical Engineering2007，20，5： | 16 |
| 3 | Effects of fundamental structure parameters on dynamic responses of submerged floating tunnel under hydrodynamic loads显示文摘This paper investigates the effects of structureparameters on dynamic responses of submerged floatingtunnel (SFT) under hydrodynamic loads. The structureparameters includes buoyancy-weight ratio (BWR), stiffnesscoefficients of the cable systems, tunnel net buoyancy andtunnel length. First, the importance of structural damp inrelation to the dynamic responses of SFT is demonstratedand the mechanism of structural damp effect is discussed.Thereafter, the fundamental structure parameters are investigatedthrough the analysis of SFT dynamic responses underhydrodynamic loads. The results indicate that the BWR ofSFT is a key structure parameter. When BWR is 1.2, there isa remarkable trend change in the vertical dynamic responseof SFT under hydrodynamic loads. The results also indicatethat the ratio of the tunnel net buoyancy to the cable stiffnesscoefficient is not a characteristic factor affecting the dynamicresponses of SFT under hydrodynamic loads. | Xu Long Fei Ge Lei Wang Youshi Hong State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China | 2009 | Acta Mechanica Sinica2009，25，3： | 8 |
| 4 | Feasibility study on buoyancy-weight ratios of a submerged floating tunnel prototype subjected to hydrodynamic loads显示文摘The research progress of a novel traffic solution,a submerged floating tunnel(SFT),is reviewed in terms of a study approach and loading scenario.Among existing publications,the buoyancy-weight ratio(BWR) is usually predefined.However,BWR is a critical structural parameter that tremendously affects the dynamic behaviour of not only the tunnel tube itself but also the cable system.In the context of a SFT prototype(SFTP) project in Qiandao Lake(Zhejiang Province,China),the importance of BWR is illustrated by finite element analysis and subsequently,an optimized BWR is proposed within a reasonable range in the present study.In the numerical model,structural damping is identified to be of importance.Rayleigh damping and the corresponding Rayleigh coefficients are attained through a sensitivity study,which shows that the adopted damping ratios are fairly suitable for SFTP.Lastly,the human sense of security is considered by quantifying the comfort index,which helps further optimize BWR in the SFTP structural parameter design. | Xu Long Fei Ge Youshi Hong | 2015 | Acta Mechanica Sinica2015，31，5： | 7 |
| 5 | Effects of traits,species identity and local environmental conditions on the assessment of interactions:insights from an alpine meadow community显示文摘Aims The prediction that facilitation is the dominant interaction in physically stressful conditions has been supported by many but not all field studies.In the present paper,we tested the effects of the identity of species,the local environmental conditions and the currencies of performance measurement on such variation.Methods Using contrasting two plots,six species,and up to five multiple traits,we comprehensively explored the effects of the above factors on the assessment of plant interactions in an alpine meadow of the QingHai Tibetan Plateau.Additionally,we attempted to figure out the possible mechanisms underlying the responses observed.The data were analysed by both standard ANOVAs and multivariate statistics.Important findings Our results demonstrated that the response to the removal of neighbours was both species and trait specific,and the effect of the ocal environmental conditions was dependent on the species involved.The contrast between plots had crucial influence on the net interactions of Kobresia macrantha,but little effect on Elymus nutans.Regarding the abiotic conditions,neighbours had significant impact on soil temperature,moist and solar radiation.The results contribute to advance our knowledge on the potential underlying factors influencing the assessment of facilitation. | Chengjin Chu Youshi Wang Qi Li Luqiang Zhao Zhengwei Ren Sa Xiao Jianli Yuan Gang Wang | 2009 | Journal of Plant Ecology2009，2，3： | 6 |
| 6 | A two-parameter model to predict fatigue life of high-strength steels in a very high cycle fatigue regime显示文摘In this paper, ultrasonic(20 kHz) fatigue tests were performed on specimens of a high-strength steel in very high cycle fatigue(VHCF) regime. Experimental results showed that for most tested specimens failed in a VHCF regime, a fatigue crack originated from the interior of specimen with a fish-eye pattern, which contained a fine granular area(FGA) centered by an inclusion as the crack origin. Then,a two-parameter model is proposed to predict the fatigue life of high-strength steels with fish-eye mode failure in a VHCF regime, which takes into account the inclusion size and the FGA size. The model was verified by the data of present experiments and those in the literature. Furthermore, an analytic formula was obtained for estimating the equivalent crack growth rate within the FGA. The results also indicated that the stress intensity factor range at the front of the FGA varies within a small range, which is irrespective of stress amplitude and fatigue life. | Chengqi Sun Xiaolong Liu Youshi Hong | 2015 | Acta Mechanica Sinica2015，31，3： | 6 |
| 7 | Synthesis of ZnO nanorods and their optical absorption in visible-light region显示文摘单个水晶的 ZnO nanorods 被热水的方法与综合 ZnCl_2 · 4 Zn 准备(哦)_2 作为先锋。nanorods 的形态学被各种各样的反应条件作为修改代理人与 cetyltrimethylammonium 溴化物(CTAB ) 控制。Thenanorods 被 XRD, TEM,紫外力的系列,和红外系列描绘。在 nanosize 的洞的微观结构在 nanorods 的表面上被观察。紫外力的系列显示准备 theas 的 ZnO nanorods 有吸收可见光以及紫外光。因此,这些 nanorods 可以是从实际应用的观点的可见光的光催化材料的好候选人。为可见光的吸收的原因在这篇文章被讨论。 | WU Lili WU Youshi SHI Yuanchang WEI Huiying | 2006 | Rare Metals2006，25，1： | 5 |
| 8 | Effects of loading condition on very-high-cycle fatigue behaviour and dominant variable analysis显示文摘The specimens of a high carbon chromium steel were quenched and tempered at 150°C,180°C and 300°C.Such specimens were tested via rotating bending and a push-pull type of axial loading to investigate the influences of loading condition on the behaviour of very-high-cycle fatigue(VHCF).Experimental results show the different influences of inclusion size on the fatigue life for the two loading conditions.Predominant factors and mechanism for the fine-granular-area(FGA)of crack origin were discussed.In addition,a reliability analysis based on a modified Tanaka-Mura model was carried out to evaluate the sensitivity of inclusion size,stress,and KFGA to the life of VHCF crack initiation. | LEI ZhengQiang XIE JiJia SUN ChengQi HONG YouShi | 2014 | Science China(Physics,Mechanics & Astronomy)2014，57，1： | 4 |
| 9 | Positive interactions can produce species-rich communities and increase species turnover through time显示文摘Aims The process of facilitation,where a species increases the survival,growth,and fitness of another species,is becoming increasingly recognized as a critical factor in shaping the structure of plant communities.This process is particularly important in stressful environments.Yet few studies have attempted to incorporate positive interactions into community ecological theories such as the neutral theory of biodiversity.Here,we use an equalizing trade-off model as a foundation to study the potential impact of facilitation on species richness and community temporal turnover.Methods Based on a spatially explicit birth–death trade-off model,we assume that the occurrence of facilitation is dependent on the presence of interspecific neighbours.We further propose that the realized birth rate for a given individual subject to facilitation is proportional to the number of interspecific neighbours within its neighbourhood.Thus,in our model,the individuals of rare species will benefit more from the existence of heterospecific individuals than common species.Important Findings As the facilitative coefficient increased,the species richness for simulated communities at the dynamically stochastic equilibrium was also increasing.Simulations also demonstrated that facilitation could increase the replacement of species through time:communities with facilitation become more dissimilar(i.e.have smaller Bray–Curtis similarity values)than communities without or with a lower degree of facilitation after the same time interval.Facilitation from interspecific neighbours on rare species increased their population sizes and consequently made them less prone to extinction,thus enhancing species richness.Meanwhile,in a saturated community,with the increase of species richness,mean population size of entire communities decreased,making species more prone to extinction on average,and thus increased the community temporal turnover.Our results suggest that future experimental work on the effect of facilitation on community-level properties should focus not just on species richness but also on other descriptors of community dynamics such as the temporal species turnover. | Youshi Wang M.D.Farnon Ellwood Fernando TMaestre Zhiyong Yang Gang Wang Chengjin Chu | 2012 | Journal of Plant Ecology2012，5，4： | 3 |
| 10 | An experimental investigation of dual-resonant and non-resonant responses for vortex-induced vibration of a long slender cylinder显示文摘Experimental results of the dual-resonant and non-resonant responses are presented for vortex-induced vibrations(VIV)of a long slender cylinder.The cylinder has a diameter of 10mm and a length of 3.31 m,giving an aspect ratio of 331.The cylinder was towed by a carriage with the velocity up to 1.5 m/s,with the Reynolds number varying from 2500 to 38000.Three different weights were used to provide the initial tension.Dual resonance means that resonance occurs simultaneously in both the cross-flow(CF)and in-line(IL)directions.The experiments were conducted in two stages.At the first stage,dual-resonant dynamic features of the cylinder subjected to vortex-induced excitation were investigated.The features of CF and IL vibration amplitude,motion orbits,phase angle differences,dominant frequencies and mode order numbers are presented.At the second stage of the experiments,particular emphasis was placed on non-resonant dynamic features.The variation of multi-mode modal displacement amplitudes was investigated in detail. | WU XiaoDong GE Fei HONG YouShi | 2014 | Science China(Physics,Mechanics & Astronomy)2014，57，2： | 3 |
| 11 | Formation mechanism of the Zn-5%Al hot-dip coating amorphous alloys(Ⅰ)--The analysis of differential scanning calorimetry显示文摘HOT-DIPPING Zn+5% Al + (0.01%-0.2%) RE alloy on steel surface by the gas reductionmethod is a new technology. Owing to its good anti-corrosive and forming properties as wellas good technical periormances, the coating attracts wide interest and has been put into indus-trial production rapidly. The authors successfully produced the coating by the electrolytic ac-tivity aid agent method and put it into industrial production. The products have been used inthe electric power and railway engineerings. Results show that the anti-corrosive | ZHANG Changqiao, WU Youshi, FANG Meixian, WU Si, WEI Xunhe, CHENG Yong and SUN YingShandong University of Technology, Jinan 250061, China | 1997 | Chinese Science Bulletin1997，42，24： | 3 |
| 12 | High-throughput computational screening and design of nanoporous materials for methane storage and carbon dioxide capture显示文摘The globally increasing concentrations of greenhouse gases in atmosphere after combustion of coal-or petroleum-based fuels give rise to tremendous interest in searching for porous materials to efficiently capture carbon dioxide(CO_2) and store methane(CH4), where the latter is a kind of clean energy source with abundant reserves and lower CO_2 emission. Hundreds of thousands of porous materials can be enrolled on the candidate list, but how to quickly identify the really promising ones, or even evolve materials(namely, rational design high-performing candidates) based on the large database of present porous materials? In this context, high-throughput computational techniques, which have emerged in the past few years as powerful tools, make the targets of fast evaluation of adsorbents and evolving materials for CO_2 capture and CH_4 storage feasible. This review provides an overview of the recent computational efforts on such related topics and discusses the further development in this field. | Minman Tong Youshi Lan Qingyuan Yang Chongli Zhong | 2018 | Green Energy & Environment2018，3，2： | 2 |
| 13 | Effects of tension on vortex-induced vibration(ⅥⅤ) responses of a long tensioned cylinder in uniform flows显示文摘The effects of tension on vortex-induced vibration(ⅥⅤ) responses for a tension-dominated long cylinder with an aspect ratio of 550 in uniform flows are experimentally investigated in this paper. The results show that elevated tension suppresses fluctuations of maximum displacement with respect to flow velocity and makes chaotic ⅥⅤ more likely to appear. With respect to periodic ⅥⅤ, if elevated tension is applied, the dominant vibration frequency in the in-line(IL) direction will switch from a fundamental vibration frequency to twice the value of the fundamental vibration frequency, which results in a ratio of the dominant vibration frequency in the IL direction to that in the cross-flow direction of 2.0. The suppression of the elevated tension in the fluctuation of the maximum displacement causes the axial tension to become an active control parameter for the ⅥⅤ maximum displacement of a tension-dominated long riser or tether of an engineering structure in deep oceans. However,the axial tension must be optimized before being used since the high dominant vibration frequency due to the elevated tension may unfavorably affect the fatigue life of the riser or tether. | Ling Kang Fei Ge Xiaodong Wu Youshi Hong | 2017 | Acta Mechanica Sinica2017，33，1： | 2 |
| 14 | Correlation of crack growth rate and stress ratio for fatigue damage containing very high cycle fatigue regime显示文摘A model is proposed to correlate the crack growth rate and stress ratio containing very high cycle fatigue regime.The model is verified by the experimental data in literature.Then a formula is derived for the effect of mean stress on fatigue strength,and it is used to estimate the fatigue strength of a bearing steel in very high cycle fatigue regime at different stress ratios.The estimated results are also compared with those by Goodman formula. | Chengqi Sun Youshi Hong | 2012 | Theoretical & Applied Mechanics Letters2012，2，3： | 2 |
| 15 | Nonhypotensive Dose of Telmisartan Attenuates Cognitive Impairment Partially Due to Peroxisome Proliferator-Activated Receptor-γ Activation in Mice With Chronic Cerebral Hypoperfusion显示文摘 | Kazuo Washida Masafumi Ihara Keiko Nishio Youshi Fujita Takakuni Maki Mahito Yamada Jun Takahashi Xiaofeng Wu Takeshi Kihara Hidefumi Ito Hidekazu Tomimoto Ryosuke Takahashi | 2010 | Stroke2010，，8： | 1 |
| 16 | Study on the delay restoration of single-track railway rescheduling显示文摘 | ZHANG Youshi JIN Weidong | 2006 | Journal of Southwest Jiaotong University(English ed)2006，14，2： | 1 |
| 17 | Microstructure and mechanical properties at TiCp/Ni-alloy interfaces in laser-synthesized coatings 显示文摘 | Wu Xiaolei Hong Youshi | 2001 | Materials Science and Engineering A2001，318，12： | 1 |
| 18 | Anti-swing and positioning control of overhead traveling crane 显示文摘 | YI Jianqiang NAO Youshi HIROTA K | 2003 | Information Sciences2003，155，12： | 1 |
| 19 | Microemulsion copolymerization of styrene and acrylonitrile with n-butanol as the cosurfactant 显示文摘 | SHI Yuanchang WU Youshi HAO Jingcheng | 2005 | Journal of Polymer Science Part A: Polymer Chemistry2005，43，1： | 1 |
| 20 | Preparation and photocatalysis of TiO2 nanoparticles Co-doped with nitrogen and lanthanum显示文摘 | Wei Huiying Wu Youshi Lun Ning | 2004 | J Mater Sei2004，39，4： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员