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Numerical Simulation of Derusting Treatment of Steel Parts By Shot Blast

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Computer Modeling in Engineering & Sciences 2019年第7期120卷 157-175页

作者： zhe li Fan Yang Yaping liu Yukui Gao School of Aerospace Engineering and Applied Mechanics Tongji UniversityShanghai200092China

In this paper,we investigated the shot blast treatment for derusting application through finite element(FE)simulations with a large number of random *** element deletion technique based on dynamic failure criteria was used to model the removal of *** cohesive surface model with damage evolution was used to characterize the decohesion of the rust/substrate *** effects of various processing and material parameters on the derusting effectiveness were *** results show that the rate of derusting mainly depends on the shot size,velocity and impinging angle,with little relevance to the rust *** spalling of the rust fragments resulted from the decohesion of the rust/substrate interface were observed,especially during the later stage of the ***,the residual stress and the surface roughness was also investigated and the beneficial effects of shot blast treatment in terms of these aspects were highlighted.

关键词： Shot blast rust removal cohesive surface finite element

Complete oxidation of ethanol over vanadium based catalysts

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Journal of Natural Gas Chemistry 2009年第3期18卷 379-382页

作者： zhe li Xia An Panjie Ren Wei Huang Kechang Xie Key Laboratory of Coal Science and Technology of Ministry of Education Taiyuan University of Technology Taiyuan 030024 China

V2O5/γ-Al2O3-TiO2 catalysts were prepared by the mixing sol-gel and co-impregnation method. The performance of the catalysts for complete oxidation of ethanol was evaluated in a conventional fixed-bed quartz reactor. And the effects of support, preparation methods and vanadium content have been investigated. The results showed that 5% V2O5 catalyst supported on γ-Al2O3-TiO2 possessed the best ethanol conversion under the considered temperature. This may be ascribed to the highly dispersible active component, mutual function between the active component and the carriers. The nature of the best performance for 5%V/γ-Al2O3-TiO2 catalyst may be related to the high V4＋ amounts on the surface. And the surface V4＋ species may play an important role in the formation of active site for the total ethanol oxidation.

关键词： ethanol γ-Al2O3-TiO2 V2O5 catalytic oxidation

Numerical simulation and experimental verification of a novel double-layered split die for high-pressure apparatus used for synthesizing superhard materials

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International Journal of Minerals,Metallurgy and Materials 2019年第3期26卷 377-385页

作者： Zhuo Yi Wen-zhi Fu Ming-zhe li Rui li liang Zhao li-yan Wang Roll Forging Institute Jilin University College of Materials Science and Engineering Jilin University Changchun Ruiguang Science & Technology Co. Ltd.

Based on the principles of massive support and lateral support, a novel double-layered split die(DLSD) for high-pressure apparatus was designed to achieve a higher pressure-bearing capacity and larger sample cavity. The stress distributions of the DLSDs with different numbers of divided blocks were investigated by the finite element method and compared with the stress distributions of the conventional belt-type die(BTD). The results show that the cylinders and first-layer supporting rings of the DLSDs have dramatically smaller stresses than those of the BTD. In addition, increasing the number of divided blocks from 4 to 10 gradually increases the stress of the cylinder but has minimal influence on the stress of the supporting rings. The pressure-bearing capacities of the DLSDs with different numbers of divided blocks, especially with fewer blocks, are all remarkably higher than the pressure-bearing capacity of the BTD. The contrast experiments were also carried out to verify the simulated results. It is concluded that the pressure-bearing capacities of the DLSDs with 4 and 8 divided blocks are 1.58 and 1.45 times greater than that of the BTD. This work is rewarding for the commercial synthesis of high-quality, large-sized superhard materials using a double-layered split high-pressure die.

关键词： split die prismatic cylinder pressure-bearing capacity high-pressure apparatus superhard material FEM

Post-ore Modification and Preservation of the Indosinian Porphyry Copper Deposit in Geza Arc, Yunnan, SW China

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Acta Geologica Sinica(English Edition) 2016年第2期90卷 755-756页

作者： liU Xuelong li Wenchang ZHANG Na LAI Anqi li zhe Kunming University of Science and Technology Kunming 650093 Yunnan China Yunnan Geological Survey Kunming 650051 Yunnan China

Objective The post-ore modification and preservation of porphyry copper deposits is controlled and influenced by various geological processes, and the regional uplift and denudation is the most important factors. This study used biotite mineral geobarometer and Apatite Fission Track （AFT） to restore the uplift evolution of the granitic porphyries in the Geza arc and to obtain quantitative data of rock erosion degree and denudation rate.

关键词： Post-ore Modification and Preservation of the Indosinian Porphyry Copper Deposit in Geza Arc SW China Yunnan

Numerical Simulations of Coastal Overwash Using A Phase-Averaged Wave−Current−Sediment Transport Model

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China Ocean Engineering 2022年第2期36卷 191-207页

作者： li Song-zhe JI Chao ZHANG Qing-he CHEN Tong-qing State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300350China Key Laboratory of Engineering Sediment Tianjin Research Institute for Water Transport EngineeringMinistry of TransportTianjin 300456China

Coastal overwash is a natural phenomenon that commonly occurs during storm events and can cause considerable changes in nearshore morphology within a short *** this study,a complete set of empirical overwash transport algorithms is developed and introduced into a phase-averaged wave-current-sediment transport coupling model that integrates the Finite-Volume Community Ocean Model(FVCOM)and the Simulating Waves Nearshore(SWAN)*** resulting morphological evolution model can simulate coastal *** against the data obtained from multiple sets of laboratory overwash experiments demonstrates that the model performs relatively well in simulating morphological changes caused by runup overwash and inundation overwash under different hydrodynamic and beach profile *** sensitivity of each empirical coefficient in the overwash transport algorithms is comprehensively *** effects of each coefficient on the output of the model are discussed,and a recommended value range is provided for each coefficient.

关键词： wave-current coupling phase-averaged model overwash wave runup morphological evolution

Site occupancies of iron in saimaite and chevkinite

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Chinese Science Bulletin 1999年第24期44卷 2274-2276页

作者： SONG Renkui DING Kuishou li zhe Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029China

Saimaite is a new Zr-Ti silicate mineral. In this note X-ray and electron probe analyses for saimaite were carried out, and the chemical formula of saimaite was calculated. In addition, the Mossbauer effects of saimai... 详细信息

关键词： new mineral saimaite Mossbauer effect site occupancy

Correlation analysis of cavitation-induced pressure pulsation and vibration in a bulb turbine

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Journal of Hydrodynamics 2023年第6期35卷 1052-1063页

作者： Tian-shu li Jian-jun Feng Guo-jun Zhu Yun-zhe li Xing-qi Luo State Key Laboratory of Eco-Hydraulics in Northwest Arid Region xi’an University of Technologyxi’an710048China

Cavitation is one of the main causes of deteriorating stability of bulb *** enhance their stability,this study examines the effects of runner cavitation on draft tube pressure fluctuation and vibration in bulb turbine through experimental *** varying cavitation coefficients,a synchronous test system,including a high-speed camera,vibration acceleration sensors and pressure pulsation sensors,is applied to obtain cavitation images of the runner,vibration and internal fluid pressure pulsation data of the draft *** results show that the correlated component of pressure pulsation signals during the cavitation process is the synchronous pressure pulsation of 16f_(n)With the development of cavitation,the amplitude of synchronous pressure pulsation increases first and then *** enhances the high-frequency vibration on the wall of runner *** root mean square(rms)of the vertical vibration component IMF3,the horizontal vibration components IMF2,IMF4 are linearly negatively correlated with the cavitation *** associated component between cavitation-induced vibration and pressure pulsation signal is 16f_(n)and its *** the process of cavitation,pressure pulsation plays a leading role in vibration.

关键词： Bulb turbine cavitation pressure fluctuation vibration correlation

Static-feedback guaranteed cost control for linear systems with outage and loss of effectiveness actuator faults

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Journal of Control and Decision 2022年第4期9卷 407-419页

作者： Chun-Hua Xie zhe li Yanli Zhou School of Electrical and Automation Engineering East China Jiaotong UniversityNanchangPeople’s Republic of China Key Laboratory of Advanced Control&Optimization of Jiangxi Province NanchangPeople’s Republic of China cCollege of Electrical and Information Engineering Hunan UniversityChangshaPeople’s Republic of China

This paper investigates the static-feedback guaranteed cost control problem for linear systems with actuator faults including outage and loss of *** the actuator redundancy condition,theoretical analysis shows that a static-feedback guaranteed cost controller can always be well designed to ensure that the resulting closed-loop system is stable with desirable quadratic *** particular,the feedback gain can be determined through the solution of a modified algebraic Riccati ***,extension to the system with uncertainties is further *** with the dynamic feedback controller,the static-feedback controller consists only of logical gates/modules and it does not require any memory element,and hence it is simplest in a design *** from the existing results,the severe and timevarying actuator outage faults can be handled very well by the proposed control ***,simulation on a linearised reduced-order aircraft system is provided for verifying the theoretical results.

关键词： Static-feedback guaranteed cost control linear systems actuator outage faults algebraic Riccati equation

Variation of the grand mean value of Si-O distances in metamorphic reactions

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Chinese Science Bulletin 2001年第8期46卷 702-704页

作者： Danian Ye zhe li Wei He Chinese Acad Sci Inst Geol & Geophys Beijing 100029 Peoples R China

The grand mean values of Si-O distances in both the left and the right sides of 33 metamorphic reaction equations have been calculated on the basis of data of single crystal structural refinement analysis. The results showed that the grand mean value of Si-O distances tends to decrease at high temperature, whereas that tends to increase at high pressure during a metamorphic reaction.

关键词： metamorphic reaction Si-O distance grand mean value.