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| 1 | Application of Computational Fluid Dynamics and Fluid Structure Interaction Techniques for Calculating the 3D Transient Flow of Journal Bearings Coupled with Rotor Systems显示文摘Journal bearings are important parts to keep the high dynamic performance of rotor machinery. Some methods have already been proposed to analysis the flow field of journal bearings, and in most of these methods simplified physical model and classic Reynolds equation are always applied. While the application of the general computational fluid dynamics (CFD)-fluid structure interaction (FSI) techniques is more beneficial for analysis of the fluid field in a journal bearing when more detailed solutions are needed. This paper deals with the quasi-coupling calculation of transient fluid dynamics of oil film in journal bearings and rotor dynamics with CFD-FSI techniques. The fluid dynamics of oil film is calculated by applying the so-called ''dynamic mesh'' technique. A new mesh movement approach is presented while the dynamic mesh models provided by FLUENT are not suitable for the transient oil flow in journal bearings. The proposed mesh movement approach is based on the structured mesh. When the journal moves, the movement distance of every grid in the flow field of bearing can be calculated, and then the update of the volume mesh can be handled automatically by user defined function (UDF). The journal displacement at each time step is obtained by solving the moving equations of the rotor-bearing system under the known oil film force condition. A case study is carried out to calculate the locus of the journal center and pressure distribution of the journal in order to prove the feasibility of this method. The calculating results indicate that the proposed method can predict the transient flow field of a journal bearing in a rotor-bearing system where more realistic models are involved. The presented calculation method provides a basis for studying the nonlinear dynamic behavior of a general rotor-bearing system. | LI Qiang YU Guichang LIU Shulian ZHENG Shuiying | 2012 | Chinese Journal of Mechanical Engineering2012，25，5： | 19 |
| 2 | Aero-engine Blade Fatigue Analysis Based on Nonlinear Continuum Damage Model Using Neural Networks显示文摘Fatigue life and reliability of aero-engine blade are always of important significance to flight safety.The establishment of damage model is one of the key factors in blade fatigue research.Conventional linear Miner's sum method is not suitable for aero-engine because of its low accuracy.A back propagation neutral network(BPNN) based on the combination of Levenberg-Marquardt(LM) and finite element method(FEM) is used to describe process of nonlinear damage accumulation behavior in material and predict fatigue life of the blade.Fatigue tests of standard specimen made from TC4 are carried out to obtain material fatigue parameters and S-N curve.A nonlinear continuum damage model(CDM),based on the BPNN with one hidden layer and ten neurons,is built to investigate the nonlinear damage accumulation behavior,in which the results from the tests are used as training set.Comparing with linear models and previous nonlinear models,BPNN has the lowest calculation error in full load range.It has significant accuracy when the load is below 500 MPa.Especially,when the load is 350 MPa,the calculation error of the BPNN is only 0.4%.The accurate model of the blade is built by using 3D coordinate measurement technology.The loading cycle in fatigue analysis is defined from takeoff to cruise in 10 min,and the load history is obtained from finite element analysis(FEA).Then the fatigue life of the compressor blade is predicted by using the BPNN model.The final fatigue life of the aero-engine blade is 6.55 104 cycles(10 916 h) based on the BPNN model,which is effective for the virtual design of aero-engine blade. | LIN Jiewei ZHANG Junhong ZHANG Guichang NI Guangjian BI Fengrong | 2012 | Chinese Journal of Mechanical Engineering2012，25，2： | 13 |
| 3 | Acetate coverage effect on the reactivity of vinyl acetate synthesis on Pd/Au alloy surfaces显示文摘Vinyl acetate (VA) synthesis on Pd/Au(111) and Pd/Au(100) surfaces has been systematically investigated through first-principles density functional theory (DFT) calculations. The DFT results showed that for VA synthesis, the 'Samanos' reaction mechanism (i.e., direct coupling of coadsorbed ethylene and acetate species and subsequent β-hydride elimination to form VA) is more favorable than the 'Moiseev' mechanism (i.e., ethylene first dehydrogenates to form vinyl species which then couple with the coadsorbed acetate species to form VA). More importantly, it was found the surface coverage of acetate has a significant effect on the reactivity of VA synthesis, and the activation energy of the rate-controlling step on Pd/Au(100) surface is smaller than that on Pd/Au(111) surface (0.88 vs. 0.95 eV), indicating the former is more active than the latter. | Bin Xing Zizhang Wei Guichang Wang | 2013 | Journal of Energy Chemistry2013，22，4： | 3 |
| 4 | Psychoacoustic Study on Contribution of Fan Noise to Engine Noise显示文摘There are more researches on engine fan noise control focusing on reducing fan noise level through optimizing fan structure,and a lot of research achievements have been obtained.However,researches on the effect of fan noise to engine noise quality are lacking.The influences of the effects of fan structure optimization on the engine noise quality are unclear.Thus,there will be a decline in fan noise level,but the deterioration of engine noise quality.Aiming at the above problems,in consideration of fan structure design and engine noise quality,an innovative method to analyze the contribution of fan noise to engine noise quality using psychoacoustic theory is proposed.The noises of diesel engine installing different cooling fans are measured by using the acoustic pressure method.The experiment results are regarded as analysis samples.The model of sensory pleasantness is used to analyze the sound quality of a diesel engine with different cooling fans.Results show that after installing 10-blade fan in medium diameter the sensory pleasantness at each test point is increased,and the increase is 13.53% on average,which indicate the improvement of the engine noise quality.In order to verify the psychoacoustical analysis,the subjective assessment is carried out.The test result shows the noise quality of engine installed10-blade fan in medium diameter is most superior.1/3 octave frequency spectrum analysis is used to study the reason of the improvement of engine noise quality.It is found that after installing proper cooling fan the sound pressure level below 400 Hz are obviously increased,the frequency assignment and spectral envelope are more reasonable and a proper cooling fan can optimize the spectrum structure of the engine noise.The psychoacoustic study is applied in the contribution of fan noise to engine noise,and the idea of engine sound quality improvement through the structure optimization is proposed. | ZHANG Junhong LIU Hai BI Fengrong NI Guangjian ZHANG Guichang LIN Jiewei YU Hanzhengnan | 2012 | Chinese Journal of Mechanical Engineering2012，25，4： | 3 |
| 5 | Analysis of Oil Consumption in Cylinder of Diesel Engine for Optimization of Piston Rings显示文摘The performance and particulate emission of a diesel engine are affected by the consumption of lubricating oil.Most studies on oil consumption mechanism of the cylinder have been done by using the experimental method,however they are very costly.Therefore,it is very necessary to study oil consumption mechanism of the cylinder and obtain the accurate results by the calculation method.Firstly,four main modes of lubricating oil consumption in cylinder are analyzed and then the oil consumption rate under common working conditions are calculated for the four modes based on an engine.Then,the factors that affect the lubricating oil consumption such as working conditions,the second ring closed gap,the elastic force of the piston rings are also investigated for the four modes.The calculation results show that most of the lubricating oil is consumed by evaporation on the liner surface.Besides,there are three other findings:(1) The oil evaporation from the liner is determined by the working condition of an engine;(2) The increase of the ring closed gap reduces the oil blow through the top ring end gap but increases blow-by;(3) With the increase of the elastic force of the ring,both the left oil film thickness and the oil throw-off at the top ring decrease.The oil scraping of the piston top edge is consequently reduced while the friction loss between the rings and the liner increases.A neural network prediction model of the lubricating oil consumption in cylinder is established based on the BP neural network theory,and then the model is trained and validated.The main piston rings parameters which affect the oil consumption are optimized by using the BP neural network prediction model and the prediction accuracy of this BP neural network is within 8%,which is acceptable for normal engineering applications.The oil consumption is also measured experimentally.The relative errors of the calculated and experimental values are less than 10%,verifying the validity of the simulation results.Applying the established simulation model and the validated BP network model is able to generate numerical results with sufficient accuracy,which significantly reduces experimental work and provides guidance for the optimal design of the piston rings diesel engines. | ZHANG Junhong ZHANG Guichang HE Zhenpeng LIN Jiewei LIU Hai | 2013 | Chinese Journal of Mechanical Engineering2013，26，1： | 3 |
| 6 | Review on the corrosion-promotion activity of graphene and its inhibition显示文摘Graphene films(GFs) and graphene-reinforced nanocomposite coatings(GNCs) have received unprecedented attention for corrosion protection because graphene possesses a remarkable chemical inertness and is completely impermeable to aggressive chemicals. However, the high electric conductivity and positive potential of graphene make graphene-based metal protectors tend to exhibit an undesirable high corrosion-promotion activity(CPA), which is widely known as the phenomenon that graphene connecting with metal accelerates the corrosion of metal substrate by inducing micro-galvanic corrosion at the defect sites of GFs or GNCs in aggressive environments. Therefore, inhibiting the CPA of graphene is currently a key focus for the application of graphene in the field of corrosion protection. In this review, the mechanisms, influencing factors, and inhibition strategies of the CPA of GFs and GNCs are highlighted from the point of view of corrosion science to address the bottlenecks and challenges for future research and potential applications of graphene for corrosion protection. | Wen Sun Yanjia Yang Zhengqing Yang Lida Wang Jing Wang Dake Xu Guichang Liu | 2021 | Journal of Materials Science & Technology2021，，32： | 2 |
| 7 | Density Functional Theoretical Studies on the Methanol Adsorption and Decomposition on Ru(0001) Surfaces显示文摘 | LIU Jianhong LV Cunqin JIN Chun GUO Yong WANG Guichang | 2016 | Chemical Research in Chinese Universities2016，32，2： | 2 |
| 8 | Theoretical Studies of the Substitution Patterns of Boron-Nitrogen (BN) Fullerenes:From C50 up to C20B15N15 CBN Ball显示文摘 | Shang Zhenfeng Wang Guichang | 2005 | Journal of Physical Chemistry A2005，109，： | 1 |
| 9 | Study on dichlorocarbene cycloaddition isomers of armchair sin-gl-walled carbon nanotubes显示文摘 | Li Ruifang Shang Zhenfeng Wang Guichang | 2002 | Joumal of Molecular Structure(Theochem)2002，583，： | 1 |
| 10 | Corrosion behavior of electrolcss deposited Ni-Cu-P coating in flue gas condensate显示文摘 | Liu Guichang Yang Lijun Wang Lida Wang Suilin Liu Chongyang Wang Jing | | 0，，： | 1 |
| 11 | Fuzzy space periodic symmetries for polyynes and their cyano-compounds显示文摘 | Xuezhuang Zhao Zhengfeng Shang Guichang Wang Xiufang Xu Ruifang Li Yinming Pan Zucheng Li | 2008 | Journal of Mathematical Chemistry2008，，3： | 1 |
| 12 | The fuzzy D6h-symmetries of azines molecules and their molecular orbitals显示文摘 | Xuezhuang Zhao Guichang Wang Xiufang Xu Yinming Pan Ruifang Li Zhengfeng Shang Zucheng Li | 2008 | Journal of Mathematical Chemistry2008，，2： | 1 |
| 13 | The Fuzzy D2h-symmetries of Ethylene Tetra-halide Molecules and their Molecular Orbitals显示文摘 | Xuezhuang Zhao Xiufang Xu Guichang Wang Yinming Pan Zhenfeng Shang Ruifang Li | 2007 | Journal of Mathematical Chemistry2007，，2： | 1 |
| 14 | Fuzzy Symmetries for Linear Molecules and their Molecular Orbitals显示文摘 | Xiufang Xu Guichang Wang Xuezhuang Zhao Yinming Pan Yunxiao Liang Zhenfeng Shang | 2007 | Journal of Mathematical Chemistry2007，，2： | 1 |
| 15 | Tribological behavior of a novel fullerene complex显示文摘 | Guichang Jiang Guangtao Li | 2007 | Wear2007，，3： | 1 |
| 16 | 温度对LiFePO4锂离子动力电池的影响[J]显示文摘 | GUIChang—qing(桂长清) | 2009 | 电池2009，39，1： | 1 |
| 17 | A study onfullerene-acrylamide copolymer nanoball:a new type of water-based lubrication additive显示文摘 | Jiang Guichang Guan Wenchao Zheng Qixing | 2005 | Wear2005，258，： | 1 |
| 18 | Se- lective oxidation of propylamine on oxygen-covered Au (111) :a DFT study显示文摘 | Pang Xianyong Wang Juanjuan Wang Guichang | 2012 | Journal of Molecular Model- ing2012，18，8： | 1 |
| 19 | Elevated temperature liquid chromatography using reversed-phase packed capillary columns显示文摘 | SHENG Guichang SHEN Yufeng LEE Milton L | 1997 | J Microcol Sep1997，9，： | 1 |
| 20 | Effects of supporting electro- lyte on galvanic deposition of Cu < sub > 2 O crystals 显示文摘 | Wang Lida Guichang Liu | 2011 | Electrochimica Acta2011，56，18： | 1 |
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