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A GPU-Based Parallel Algorithm for 2D Large Deformation Contact Problems Using the Finite Particle Method

Computer Modeling in Engineering & Sciences 2021年第11期129卷 595-626页

作者： Wei Wang Yanfeng Zheng Jingzhe tang Chao Yang Yaozhi Luo College of Civil Engineering and Architecture Zhejiang UniversityHangzhou310058China Center for Balance Architecture Zhejiang UniversityHangzhou310028China Architectural Design and Research Institute of Zhejiang University Co. Ltd.Hangzhou310028China

Large deformation contact problems generally involve highly nonlinear behaviors,which are very time-consuming and may lead to convergence *** finite particle method(FPM)effectively separates pure deformation from total motion in large deformation *** addition,the decoupled procedures of the FPM make it suitable for parallel computing,which may provide an approach to solve time-consuming *** this study,a graphics processing unit(GPU)-based parallel algorithm is proposed for two-dimensional large deformation contact *** fundamentals of the FPM for planar solids are first briefly introduced,including the equations of motion of particles and the internal forces of quadrilateral ***,a linked-list data structure suitable for parallel processing is built,and parallel global and local search algorithms are presented for contact *** contact forces are then derived and directly exerted on *** proposed method is implemented with main solution procedures executed in parallel on a *** verification problems comprising large deformation frictional contacts are presented,and the accuracy of the proposed algorithm is ***,the algorithm’s performance is investigated via a large-scale contact problem,and the maximum speedups of total computational time and contact calculation reach 28.5 and 77.4,respectively,relative to commercial finite element software Abaqus/Explicit running on a single-core central processing unit(CPU).The contact calculation time percentage of the total calculation time is only 18%with the FPM,much smaller than that(50%)with Abaqus/Explicit,demonstrating the efficiency of the proposed method.

关键词： Finite particle method graphics processing unit(GPU) parallel computing contact algorithm large

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Application of equivalent resistance to simplification of Sutong Bridge piers in tidal river section modeling

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Water Science and Engineering 2012年第3期5卷 316-328页

作者： Lei tang WeiZHANG Ming-xiao XIE Zhen YU College of Harbor Coastal and Offshore Engineering Hohai University Nanjing 210098 P. R. China Tianjin Research Institute for Water Transport Engineering Ministry of Transport Tianjin 300456 P. R. China Changjiang Waterway Planning Design and Research Institute Wuhan 430010 P. R. China

This paper describes some details and procedural steps in the equivalent resistance （E-R） method for simplifying the pier group of the Sutong Bridge, which is located on the tidal reach of the lower Yangtze River, in Jiangsu Province. Using a two-dimensional tidal current numerical model, three different models were established： the non-bridge pier model, original bridge pier model, and simplified bridge pier model. The difference in hydrodynamic parameters, including water level, velocity, and diversion ratio, as well as time efficiency between these three models is discussed in detail. The results show that simplifying the pier group using the E-R method influences the water level and velocity near the piers, but has no influence on the diversion ratio of each cross-section of the Xuliujing reach located in the lower Yangtze River. Furthermore, the simplified bridge pier model takes half the calculation time that the original bridge pier model needs. Thus, it is concluded that the E-R method can be use to simplify bridge piers in tidal river section modeling reasonably and efficiently.

关键词： E-R method, tidal river section, pier group, simplification numerical modeling

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Series multilayer internal electrodes for high energy density glass-ceramic capacitors

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Chinese Science Bulletin 2009年第15期54卷 2688-2693页

作者： LUO Jun DU Jun tang Qun MAO ChangHui Advanced Electronic Materials Institute General Research Institute for Nonferrous Metals Beijing 100088 China

The glass-ceramic dielectrics and internal electrode structures are investigated for improving the general energy storage density of capacitors. Calculation indicates that glass-ceramics acquired from glass matrix annealing at 850℃ for 3 hours can be approximately up to 17 J/cm3 in energy storage density. They are appropriately chosen as the dielectrics for preparing high energy storage density capacitors (HESDCs). A series multilayer structure of internal electrode is developed for the HESDCs, in which each layer is a combination of gold film and silver paste. This electrode structure promises the capacitor immune from the residual porosity defects inevitably brought by electrode paste sintering process, and specifically improves the electrical breakdown strength of the capacitor. Based on this new electrode structure, the energy storage densities of capacitors are increased by more than one order of magnitude compared with those traditional ones with only single layer of internal electrode. Thus, HESDCs based on the optimized glass-ceramic dielectrics can potentially achieve 7.5 J/cm3 in energy storage density, even taking into consideration the enlargement of total capacitor volumes while encapsulating practicable capacitors from dielectrics media.

关键词：陶瓷电容器高能量密度微晶玻璃多层结构电极系电极结构存储密度储能密度

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Finite element multigrid method for multi-term time fractional advection diffusion equations

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International Journal of Modeling, Simulation, and Scientific Computing 2015年第1期6卷 1-25页

作者： Weiping Bu Xiangtao Liu Yifa tang Jiye Yang LSEC ICMSECAcademy of Mathematics and Systems Science Chinese Academy of SciencesBeijing 100190P.R.China Cipher Ground 675 Rt 1 South North BrunswickNJ 08902USA School of Mathematics and Computer Ningxia University Yinchuan 750021P.R.China

In this paper,a class of multi-term time fractional advection diffusion equations(MTFADEs)is *** finite difference method in temporal direction and finite element method in spatial direction,two fully discrete schemes of MTFADEs with different definitions on multi-term time fractional derivative are *** stability and convergence of these numerical schemes are ***,a V-cycle multigrid method is proposed to solve the resulting linear *** convergence of the multigrid method is ***,some numerical examples are given for verification of our theoretical analysis.

关键词： Multi-term time fractional advection diffusion equation finite element method stability convergence V-cycle multigrid method

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Sequence framework of two different kinds of margins and their response to tectonic activity during the Middle-Late Triassic,Ordos Basin

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Science China Earth Sciences 2007年第Z2期50卷 203-216页

作者： YANG MingHui LIU ChiYang ZHENG MengLin LAN ChaoLi tang Xuan Key Laboratory for Hydrocarbon Accumulation of Education Ministry in China University of Petroleum Basin and Reservoir Research CenterChina University of PetroleumBeijing 102249China State Key Laboratory of Continental Dynamics(Northwest University) Xi'an710069China Exploration&Production Research Institute SINOPECBeijing 100083China School of Engineering of Oil&Gas China University of PetroleumBeijing 102249China School of Energy China University of GeosciencesBeijing 100083China

Two kinds of margin respectively occur in the Ordos Basin during the Middle-Late Triassic(Yanchang Age),one is foreland margin developed under the background of flexural subsidence by thrusting intensively in the southwest margin,and the other is intracratonic basin margin by stable subsidence in northern and central parts of the *** Middle-Late Triassic Yanchang Formation can be divided into four regional third-order sequences,which are separated by gentle angular unconformity or regional erosion surface,made up of lowstand system tract(LST),expanding system tract(EST)and highstand system tract(HST)from lower to upper within a *** there are distinct differences of the sequence framework between the southwest margin and northern and central parts of the *** southwest margin develops heavy conglomerate layer and unconformity as a result of orogeny by thrusting,and the intracratonic basin margin by stable subsidence in the northern and central parts grows aggradational sandstone,conglomerate in fluvio-delta system and parallel *** depositional framework of southwest margin reflects the tectonic evolution from flexural subsidence by thrusting to rebounded *** formation of sequence boundary is related to the resilient uplift and *** sequence stratigraphic framework and depositional system tract configuration in the foreland basin are controlled by structural activity of the fold and thrust belt,and the sequence succession reflects episodic thrusting of the Middle-Late Triassic toward the foreland *** sequence evolution in northern and central parts reflects the depositional succession of fluvio-delta system under intracratonic background,composed of coarse-grained sediment in braided channel deposit at the lower,meandering channel deposit in the middle and fine-grained sediment in the flood plain at the upper,dominated by lake level *** the deposit of the LST in the intracraton basin,accommodation spa

关键词： sequence architecture tectonic response basement structure the Middle-Late Triassic(Yanchang Age) Ordos Basin

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Plasma-assisted abatement of SF6 in a packed bed plasma reactor: understanding the effect of gas composition

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Plasma Science and Technology 2020年第5期22卷 95-104页

作者： Xiaoxing ZHANG Yuan TIAN Zhaolun CUI Ju tang School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072People's Republic of China School of Electrical and Electronic Engineering Hubei University of TechnologyWuhan 430068People's Republic of China

The potential impact of SF6 as a potent greenhouse gas on the global climate is highly *** paper studies the effect of H2O concentration,SF6 inlet concentration and pre-heating temperature on SF6 abatement in a packed bed plasma reactor in terms of the removal efficiency and products *** results showed that the best performance in SF6 abatement was obtained at 1%H2O and 100°C with 98.7%destruction and remove efficiency(DRE)at 2%*** energy yields was obtained under higher SF6 inlet ***,the existence of water vapor weakened the micro-discharge and provided H and OH radicals for this system,which showed a close relationship to removal efficiency and products *** four sulfur-containing products,SO2 F2 was more stable than SOF2,SOF4 and ***,SOF4 and SO2 were very susceptible to the above *** article provides a better understanding of SF6 abatement in a view of both scientific and engineering.

关键词： SF6 PBR plasma gas composition

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Development of a Drilling and Coring Test-bed for Lunar Subsurface Exploration and Preliminary Experiments

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Chinese Journal of Mechanical Engineering 2014年第4期27卷 673-682页

作者： SHI Xiaomeng DENG Zongquan QUAN Qiquan tang Dewei HOU Xuyan JIANG Shengyuan School of Mechatronics Engineering Harbin Institute of Technology

Drill sampling has been widely employed as an effective way to acquire deep samples in extraterrestrial exploration. A novel sampling method, namely, flexible-tube coring, was adopted for the Chang＇e mission to acquire drilling cores without damaging stratification information. Since the extraterrestrial environment is uncertain and different from the terrestrial environment, automated drill sampling missions are at risk of failure. The principles of drilling and coring for the lunar subsurface should be fully tested and verified on earth before launch. This paper proposes a test-bed for conducting the aforementioned experiments on earth. The test-bed comprises a rotary-percussive drilling mechanism, penetrating mechanism, drilling medium container, and signal acquisition and control system. For granular soil, coring experiments indicate that the sampling method has a high coring rate greater than 80%. For hard rock, drilling experiments indicate that the percussive frequency greatly affects the drilling efficiency. A multi-layered simulant composed of granular soil and hard rock is built to test the adaptability of drilling and coring. To tackle complex drilling media, an intelligent drilling strategy based on online recognition is proposed to improve the adaptability of the sampling drill. The primary features of this research are the proposal of a scheme for drilling and coring a test-bed for validation on earth and the execution of drilling experiments in complex media.

关键词： drilling and coring device test-bed lunar soil sampling

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Effect of Potassium and C/N Ratios on Conversion of NH_4^+ in Soils

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Pedosphere 2008年第4期18卷 539-544页

作者： tang Yan WANG Xiao-Zhi ZHAO Hai-Tao FENG Ke College of Environment Science and Engineering Yangzhou University Yangzhou 225009 （China）

Two soils, one consisting of 1:1 clay minerals at pH 4.5 and the other containing 2:1 clay minerals at pH 7.0, were used to estimate the conversion of added NH+4 under different C/N ratios (glucose as the C source) and the addition of potassium. Under lower C/N ratios (0:1 and 5:1), a large part of the added NH4+ in the acid soil was held in the forms of either exchangeable or water soluble NH4+ for a relatively long time and under higher C/N ratio (50:1), a large amount of the added NH4+ was directly immobilized by microorganisms. In the second soil containing appreciable 2:1 type clay minerals a large part of the added NH+4 at first quickly entered the interlayer of the minerals under both lower and higher C/N ratios. In second condition, however, owing to microbial assimilation stimulated by glucose the newly fixed NH4+c ould be completely released in further incubation because of a large concentration gradient between external NH4+ and fixed NH4+ in the mineral interlayer caused by heterotrophic microorganisms, which imply the fixed NH4+ to be available to plants. The results also showed that if a large amount of K+ with carbon source together was added to soil, the higher K+ concentration of soil solution could impede the release of fixed NH4+ , even if there was a lot of carbon source.

关键词： clay minerals fixed NH4^+ N mineralization organic C potassium

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Characterization of the charge transport and electrical properties in solution-processed semiconducting polymers

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Science China(Physics,Mechanics & Astronomy) 2012年第5期55卷 786-791页

作者： WANG LiGuo ZHANG HuaiWu tang XiaoLi LI YuanXun ZHONG ZhiYong State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054China

The conventional charge transport models based on density- and field-dependent mobility, only having a non-Arrhenius tem- perature dependence, cannot give good current-voltage characteristics of poly （2-methoxy-5-（2＇-ethylhexyloxy）-p-phenylene vinylene）（MEH-PPV） hole-only devices. In this paper, we demonstrate that the current-voltage characteristics can give a good unified description of the temperature, carrier density mad electric field dependence of mobility based on both the Arrhenius temperature dependence and the non-Arrhenius temperature dependence. Fu^hermore, we perform a systematic study of charge transport and electrical properties for MEH-PPV. It is shown that the boundary carrier density has an important effect on the current-voltage characteristics. Too large or too small values of boundary carrier density will lead to incorrect cur- rent-voltage characteristics. The numerically calculated carrier density is a decreasing function of the distance to the interface, and the numerically calculated electric field is an increasing function of the distance. Both the maximum of carrier density and the minimum of electric field appear near the interface.

关键词： charge transport electrical properties semiconducting polymers

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Internal Resonances for Heave, Roll and Pitch Modes of A Spar Platform Considering Wave and Vortex-Induced Loads in the Main Roll Resonance

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China Ocean Engineering 2017年第4期31卷 408-417页

作者： LI Wei tang You-gang LIU Li-qin LI Yan WANG Bin State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University Tianjin 300072 China School of Civil Engineering Tianjin University Tianjin 300072 China Coltabomtive Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai 200240 China

We present a study of the nonlinear coupling internal resonance for the heave roll and pitch performance of a spar platform under the wave and vortex-induced loads when the ratio of the frequencies of heave, roll and pitch are approximately 2：1：1. In consideration of varying wet surface, the three DOFs nonlinear coupled equations are established for the spar platform under the effect of the first-order wave loads in the heave and pitch, and vortex-induced loads in the roll. By utilizing the method of multi-scales when the vortex-induced frequency is close to the natural roll frequency, the first-order perturbation solution is obtained analytically and further validated by the numerical integration. Sensitivity analysis is performed to understand the influence of the damping and the internal detuning parameter. Two cases with internal resonance are shown. The first case is that no saturation phenomenon exists under small vortex-induced loads. The first order perturbation solution illustrates that only the vortex-induced frequency motion in roll and the super-harmonic frequency motion in heave are excited. The second case is that the vortex-induced loads are large enough to excite the pitch and a saturation phenomenon in the heave mode follows. The results show that there is no steady response occurrence for some cases. For these cases chaos occurs and large amplitudes response can be induced by the vortex-induced excitation.

关键词： spar platform three DOFs nonlinear equations multiple scales super-harmonic response energy infiltration

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