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活塞制动的静态数值模拟和实验研究
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作者 蔡庆荣 宋太阳 《弹道学报》 CSCD 北大核心 2003年第1期69-72,共4页
针对筒式武器的闭气活塞制动机构 ,建立了制动过程的二维轴对称力学模型 ,采用有限元分析 (FEA)方法进行数值计算 ,对制动部件在不同的加载速率条件下的力学特性加以分析比较 ,给出了其位移响应和应力响应计算结果 。
关键词 筒式武器 闭气活塞制动机构 静态数值模拟 实验研究 有限元分析 力学分析
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Effects of static magnetic fields on melt flow in detached solidification 被引量:3
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作者 彭岚 龚欢 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第3期936-943,共8页
A series of three-dimensional numerical computations were conducted to understand the effects of different static magnetic fields on thermal fluctuation and melt flow during the detached solidification of CdZnTe. Nume... A series of three-dimensional numerical computations were conducted to understand the effects of different static magnetic fields on thermal fluctuation and melt flow during the detached solidification of CdZnTe. Numerical calculations were carried out by three different configurations of magnetic field: without magnetic field, with an axial magnetic field (AMF) and with a cusp-shaped magnetic field (CMF). The results reveal that the magnetic fields can effectively suppress the melt flow and thermal fluctuation and the suppression effect of the AMF is stronger than that of the CMF. Besides, the physical mechanism of thermocapillary?buoyancy convection instability was discussed and the effects of magnetic field on the critical Marangoni number were also obtained. 展开更多
关键词 detached solidification static magnetic field thermocapillary-buoyancy convection numerical simulation CDZNTE
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Numerical experiment rock fragmentation by combined dynamic and static loads under dual-cutter head 被引量:4
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作者 Zhao Fujun Wang Hongyu +2 位作者 Shen Peiwen Chen Caixian Xu Yanfei 《Engineering Sciences》 EI 2012年第2期56-60,共5页
This paper puts forward a new rock fragmentation loading method of dual-cutter head combined dynamic and static loads. By applying the numerical simulation software - RFPA2D, we have done numerical experiment about th... This paper puts forward a new rock fragmentation loading method of dual-cutter head combined dynamic and static loads. By applying the numerical simulation software - RFPA2D, we have done numerical experiment about the sihstone' s crushing effect by dynamic load on single cutter head without confining pressure, dynamic load on single cut- ter head with confining pressure 10 MPa and different dual-cutter heads spacing by combined dynamic and static loads with confining pressure 10 MPa. Experimental results show that the confining pressure can obviously affect the rock frag- mentation effect. Combined dynamic and static loads can greatly improve the rock fragmentation effect. There exists an optimal spacing of dual-cutter head that can make the rock fragmentation achieve the desired effect. Through analyzing the acoustic emission accumulative energy and quantity, the authors make a conclusion that the optimum spacing is 30 mm. 展开更多
关键词 coupled static and dynamic loads rock fragmentation average degree numerical experiment
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Numerical simulation of dynamic fracture properties of rocks under different static stress conditions 被引量:6
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作者 LIANG Zheng-zhao QIAN Xi-kun +1 位作者 ZHANG Ya-fang LIAO Zhi-yi 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第2期624-644,共21页
When underground cavities are subjected to explosive stress waves,a uniquely damaged zone may appear due to the combined effect of dynamic loading and static pre-load stress.In this study,a rate-dependent two-dimensio... When underground cavities are subjected to explosive stress waves,a uniquely damaged zone may appear due to the combined effect of dynamic loading and static pre-load stress.In this study,a rate-dependent two-dimensional rock dynamic constitutive model was established to investigate the dynamic fractures of rocks under different static stress conditions.The effects of the loading rate and peak amplitude of the blasting wave under different confining pressures and the vertical compressive coefficient(K_(0))were considered.The numerical simulated results reproduced the initiation and further propagation of primary radial crack fractures,which were in agreement with the experimental results.The dynamic loading rate,peak amplitude,static vertical compressive coefficient(K_(0))and confining pressure affected the evolution of fractures around the borehole.The heterogeneity parameter(m)plays an important role in the evolution of fractures around the borehole.The crack propagation path became more discontinuous and rougher in a smallerheterogeneity parameter case. 展开更多
关键词 rock mechanics coupled static and dynamic loading numerical simulation rate-dependent damage constitutive model
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Numerical simulation of a self-absorbing microbubble generator for a cyclonic-static microbubble flotation column 被引量:17
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作者 LI Lin LIU Jiongtian +1 位作者 WANG Lijun YU Hesheng 《Mining Science and Technology》 EI CAS 2010年第1期88-92,共5页
The Cyclonic-Static Microbubble Flotation Column (FCSMC) is currently a widely used, novel type of flotation device. The self-absorbing microbubble generator is the core component of this device. The structure of the ... The Cyclonic-Static Microbubble Flotation Column (FCSMC) is currently a widely used, novel type of flotation device. The self-absorbing microbubble generator is the core component of this device. The structure of the microbubble generator directly influences flotation column performance by affecting bubble size and distribution as well as gas holdup in the column. However, the complicated flow inside the generator results in high R&D costs and difficulty in testing. Thus, the CFD software, FLUENT, was used to simulate the gas-liquid two-phase flow inside a self-absorbing microbubble generator. The effect of area ratio, a key structural parameter, was studied in detail. Critical flow-field parameters including velocity, turbulent kinetic energy, minimum static pressure and gas holdup were obtained. The simulation results demonstrate that the optimum area ratio is 3. 展开更多
关键词 self-absorbing microbubble generator flotation column two-phase flow numerical simulation
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A Macro Model for Traffic Flow with Consideration of Static Bottleneck 被引量:2
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作者 唐铁桥 李鹏 +1 位作者 吴永洪 黄海军 《Communications in Theoretical Physics》 SCIE CAS CSCD 2012年第8期300-306,共7页
In this paper, we develop a macro model for traffic flow with consideration of static bottleneck to explore the impacts of static bottleneck on traffic flow. The analytical and numerical results show that the proposed... In this paper, we develop a macro model for traffic flow with consideration of static bottleneck to explore the impacts of static bottleneck on traffic flow. The analytical and numerical results show that the proposed model can qualitatively describe the equilibrium flux, uniform flow and small perturbation under the action of a static bottleneck. 展开更多
关键词 traffic flow STABILITY static bottleneck
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