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Comparison of evolution laws of stress and strain fields in hot rolling of titanium alloy large rings with different sizes 被引量:3
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作者 王敏 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第7期1611-1619,共9页
For hot rolling of titanium alloy large rings,evolution laws of stress and strain fields in rings with various sizes were explored and compared based on a reliable coupled thermo-mechanical three-dimensional (3D) fi... For hot rolling of titanium alloy large rings,evolution laws of stress and strain fields in rings with various sizes were explored and compared based on a reliable coupled thermo-mechanical three-dimensional (3D) finite element (FE) model.The results show that for forming processes of different rings,as γ^-(the equivalent distribution ratio of feed amount per revolution of a process) decreases,the final peak Mises stress may transfer from the biting point at the driver roll side to that at the idle roll side,and the final peak equivalent plastic strain may transfer from the outside surface to the inside surface;as L^- (the equivalent deformation zone length of a process) increases,the final peak Mises stress may appear in the middle layer.The final positions of peak Mises stress and equivalent plastic strain are the combined effects of the above two aspects.In the deformation zone of a deformed ring,the surface layers are in the 3D compressive stress state,while the middle layer is in the 1D compressive and 2D tensile stress state or 2D compressive and 1D tensile stress state;the whole ring is in the 1D compressive and 2D tensile strain state. 展开更多
关键词 titanium alloy hot rolling of large rings stress and strain modeling and simulation finite element
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Constitutive modeling and springback simulation for 2524 aluminum alloy in creep age forming 被引量:10
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作者 杨有良 湛利华 李杰 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第9期3048-3055,共8页
The constitutive modeling and springback simulation for AA2524 sheet in creep age forming(CAF) process were presented.A series of creep aging tests were performed on AA2524 at the temperature of 180-200 °C and ... The constitutive modeling and springback simulation for AA2524 sheet in creep age forming(CAF) process were presented.A series of creep aging tests were performed on AA2524 at the temperature of 180-200 °C and under the stress of 140-210 MPa for 16 h.Based on these experimental data,material constitutive equations which can well characterize creep aging behaviors of the tested alloy were developed.The effect of interior stress distributed along the sheet thickness on springback was simulated using FE software MSC.MARC by compiling the established constitutive models into the user subroutine.The simulation results showed that the amount of sheet springback was 61.12% when merely considering tensile stress existing along the sheet thickness;while sheet springback was up to 65.93% when taking both tensile and compressive stresses into account.In addition,an AA2524 rectangular sheet was subjected to CAF experiment in resistance furnace.The springback value of the formed rectangular sheet was 68.2%,which was much closer to 65.93%.This confirms that both tensile and compressive stresses across the sheet thickness should be considered in accurately predicting springback of the sheet after forming,which can be more consistent with experimental results. 展开更多
关键词 2524 aluminum alloy creep age forming constitutive modeling springback simulation stress state
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Physical simulation of rock burst induced by stress waves 被引量:16
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作者 LU Ai-hong MAO Xian-biao LIU Hai-shun 《Journal of China University of Mining and Technology》 EI 2008年第3期401-405,共5页
The behavior of stress wave propagation in rock walls and the process of rock bursts were simulated by application tests of material similar to rock. Results show that 1) the attenuation characteristics of stress wave... The behavior of stress wave propagation in rock walls and the process of rock bursts were simulated by application tests of material similar to rock. Results show that 1) the attenuation characteristics of stress waves were related to the material proper-ties, stress waves attenuate more quickly in soft material and 2) when the explosion load was applied at the top of the roadway, the number and the length of the cracks increased with a decrease in the distance between the explosive point and roof of the roadway. When the distance was 280 mm, only some chips appeared near the source, when the distance was 210 mm, some small cracks started to appear near the road-rib and when the distance was reduced to 140 mm, larger cracks appeared at the road-rib. It can be concluded that, under a given stress the number of cracks is closely related to the intensity of stress waves. The cracks in the sur-rounding rock can be reduced by controlling the intensity of the stress waves and rock bursts can be avoided to some extent by pre-venting the formation of layered crack structures. A new experimental approach has been provided for studying rock bursts by using physical simulation. 展开更多
关键词 similar material stress wave physical simulation rock burst
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基于有限元法的制动气室支架优化设计 被引量:3
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作者 黄东东 《汽车实用技术》 2017年第16期96-98,共3页
文章针对某轻型卡车使用过程中出现气室支架断裂问题进行了原因分析,采用仿真分析方法,分析气室支架应力集中点,针对应力集中点进行结构优化设计,最终提供了一种较好的解决方案,为后续其它支架开发提供了一种有效的借鉴思路。
关键词 气室支架 断裂 仿真:应力
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Simulation Modeling of the Motion Control of a Two Degree of Freedom,Tendon Based,Parallel Manipulator in Operational Space Using MATLAB 被引量:9
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作者 HILLER Manfred 《Journal of China University of Mining and Technology》 2007年第2期179-183,共5页
In this paper a dynamical model of a two degree of freedom,tendon based,parallel manipulator (TBPM) system is proposed. The motion control methods of the TBPM system were designed. Using MATLAB,the motion control simu... In this paper a dynamical model of a two degree of freedom,tendon based,parallel manipulator (TBPM) system is proposed. The motion control methods of the TBPM system were designed. Using MATLAB,the motion control simulation of this model TBPM system was implemented in preparation for actual experiments. The results of the simulation demonstrated that the response time of the system was in a reasonable range,the motion behavior of the platform was stable and the tension forces acting on the tendons were in a safe range and acceptable. Furthermore,the parameters of the controllers were optimized using MATLAB and better results for the time response were obtained. 展开更多
关键词 tendon based parallel manipulator (TBPM) SIMULATION MATLAB
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Research on relationship between leakage of incompressible fluid and pressure change in pipeline 被引量:2
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作者 YANG Li ZENG Zhoumo +2 位作者 FENG Hao HE Yongfang GAO Chao 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2021年第2期146-153,共8页
In practical engineering,only pressure sensors are allowed to install to detect leakage in most of oil transportation pipelines,while flowmeters are only installed at the toll ports.For incompressible fluid,the leakag... In practical engineering,only pressure sensors are allowed to install to detect leakage in most of oil transportation pipelines,while flowmeters are only installed at the toll ports.For incompressible fluid,the leakage rate and amount cannot be accurately calculated through critical pressure conditions.In this paper,a micro-element body of the pipeline was intercepted for calculation.The relationship between radial displacement and pressure of pipe wall was studied based on the stress-strain equation.Then,the strain response of pipeline volume with pipeline pressure was obtained.The change in volume expansion of pipeline was used to characterize leakage of incompressible fluid.Finally,the calculation model of leakage amount of incompressible fluid was obtained.To verify the above theory,the pipeline expansion model under pressure was established by COMSOL software for simulation.Both simulation results and deduction equations show that the volumetric change has a quadratic parabolic relationship with the change of pipeline pressure.However,the relationship between them can be approximately linear when the pressure change is not too large.In addition,the leakage of incompressible fluid under the pressure of 0 MPa-0.8 MPa was obtained by experiments.The experimental results verify the linear relationship between leakage of incompressible fluid and the change of pipeline pressure.The theoretical and experimental results provide a basis for the calculation of leakage of incompressible fluid in the pipeline. 展开更多
关键词 incompressible fluid volumetric strain finite element simulation pressure gradient LEAKAGE
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Thermodynamic analysis and dynamics simulation on reaction of Al_2O and AlCl_2 with carbon under vacuum 被引量:1
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作者 卢勇 周岳珍 +5 位作者 陈秀敏 李紫勇 郁青春 刘大春 杨斌 徐宝强 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第2期286-292,共7页
The feasibility study of the AlCl(g) generated by Al_2O-AlCl_2-C system under vacuum was carried out by thermodynamic analysis and CASTEP package of the Material Studio program which was based on density functional th... The feasibility study of the AlCl(g) generated by Al_2O-AlCl_2-C system under vacuum was carried out by thermodynamic analysis and CASTEP package of the Material Studio program which was based on density functional theory(DFT) formalism. Thermodynamic calculations indicate that Al Cl and CO molecules can be formed under conditions of temperature 1760 K and the pressure of 60 Pa. The interaction of Al_2O and AlCl_2 with C shows that the chemical adsorption of Al_2O and AlCl_2 does take place on C(001) crystal plane, and at the same time, new chemical bond is formed between Al atom in Al_2O and Cl atoms from one of the Al—Cl bonds in AlCl_2. The results, after 1.25 ps dynamics simulation, indicate that adsorbed Al Cl molecules are generated and CO molecule will be formed in this system, and they will escape from C(001) surface after a longer period of dynamic simulation time. It means that the reaction of Al_2O and AlCl_2 with C can be carried out under given constraint condition. 展开更多
关键词 Ab initio molecular dynamics carbothermic-chlorination (AlCl2) reaction THERMODYNAMICS INTERACTION Al2O
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Simulation study of coal mine safety investment based on system dynamics 被引量:11
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作者 Tong Lei Dou Yuanyuan 《International Journal of Mining Science and Technology》 SCIE EI 2014年第2期201-205,共5页
To generate dynamic planning for coal mine safety investment, this study applies system dynamics to decision-making, classifying safety investments by accident type. It validates the relationship between safety invest... To generate dynamic planning for coal mine safety investment, this study applies system dynamics to decision-making, classifying safety investments by accident type. It validates the relationship between safety investments and accident cost, by structurally analyzing the causality between safety investments and their influence factors. Our simulation model, based on Vensim software, conducts simulation analysis on a series of actual data from a coalmine in Shanxi Province. Our results indicate a lag phase in safety investments, and that increasing pre-phase safety investment reduces accident costs. We found that a 24% increase in initial safety investment could help reach the target accident costs level 14 months earlier. Our simulation test included nine kinds of variation trends of accident costs brought by different investment ratios on accident prevention. We found an optimized ratio of accident prevention investments allowing a mine to reach accident cost goals 4 months earlier, without changing its total investment. 展开更多
关键词 System dynamicsCoal mineSafety investmentCost of accident
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The Study of CAD & Processing Error for End-Gear with Arc Tooth
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作者 Zhigang Liu 《International Journal of Technology Management》 2013年第1期77-79,共3页
This paper presents methods for determining the basic geometry of end-gear with arc tooth external diameter, width of tooth, end module, number of teeth, pressure angle, tooth, tooth clearance parameters; at the same ... This paper presents methods for determining the basic geometry of end-gear with arc tooth external diameter, width of tooth, end module, number of teeth, pressure angle, tooth, tooth clearance parameters; at the same time gives the tooth bearing strength calculation method, and the formulas to calculate the tooth shear stress, surface stress and bolt fastening force of equivalent stress is established; finally write the software error simulation analysis. 展开更多
关键词 error simulation end-gear with arc tooth SIMULATION strength calculation
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JUNCTION BETWEEN GANJIANG FAULT AND TANLU FAULT AND ITS SIGNIFICANCE TO MINERALIZATION 被引量:2
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作者 CUIXuejun XIABin +3 位作者 ZENGZuoxun LIULilin CHENXiangyun YANGWeiran 《Geotectonica et Metallogenia》 2005年第1期1-12,共12页
The concept of fault junction is proposed to describe the relationship between the two faults by the authors. The junction relationship between Ganjiang and Tanlu faults is analyzed in this paper, and this has been el... The concept of fault junction is proposed to describe the relationship between the two faults by the authors. The junction relationship between Ganjiang and Tanlu faults is analyzed in this paper, and this has been elucidated through numerical simulation about the tectonic stress field analysis. Numerical simulation of the tectonic stress field conducted for the major mineralization stage of the Jiujiang-Ruichang junction area reveals that the stress field of the junction structure at the major mineralization stage shows a relatively close relationship with the formation of the ore deposits (occurrences). 展开更多
关键词 junction relationship numerical simulation Jiujiang-Ruichang junction area structural stress field MINERALIZATION
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Dynamic Effect of Rolling Massage on Blood Flow
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作者 CHEN Yan-Yan YI Hou-Hui +1 位作者 LI Hua-Bing FANG Hai-Ping 《Communications in Theoretical Physics》 SCIE CAS CSCD 2009年第2期331-334,共4页
The Chinese traditional medical massage has been used as a natural therapy to eliminate some diseases. Here, the effect of the rolling massage frequency to the blood flow in the blood vessels under the rolling massage... The Chinese traditional medical massage has been used as a natural therapy to eliminate some diseases. Here, the effect of the rolling massage frequency to the blood flow in the blood vessels under the rolling massage manipulation is studied by the lattice Boltzmann simulation. The simulation results show that when the frequency is smaller than or comparable to the pulsatile frequency of the blood flow, the effect on the blood flux by the rolling massage is small. 011 the contrast, if the frequency is twice or more times of the pulsatile frequency of the blood flow, the blood flux is greatly enhanced and increases linearly with respect to the frequency. Similar behavior has also been observed on the shear stress on the blood vessel walls. The result is helpful for understanding that the rolling massage has the function of promoting the blood circulation and removing the blood stasis. 展开更多
关键词 rolling manipulation moving stenosed vessel wall shear stress LBM
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Power System Dynamical Simulation Application for Out-of-Step Relay Testing
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作者 Antans Sauhats Andrejs Utans +4 位作者 Martins Silarajs Jevgenijs Kucajevs Dmitrijs Antonovs Edite Biela Igor Moshkin 《Journal of Energy and Power Engineering》 2012年第8期1343-1348,共6页
OOS (out-of-step) condition prevention becomes an imperative task to avoid possible power system blackout and collapses. To be confident in correct OOS relaying, the OOS protection device behavior under the vast maj... OOS (out-of-step) condition prevention becomes an imperative task to avoid possible power system blackout and collapses. To be confident in correct OOS relaying, the OOS protection device behavior under the vast majority of power system abnormal regimes should be tested. Comprehensive testing procedure becomes especially important for complex power systems when power system parameters and consequently device settings are not clearly defined or may vary in time. For such complex systems the real OOS protection device testing may become a problem because of specific waveforms of signals persisting during OOS condition. The goal of the methodology, presented in the paper, is to achieve the possibility of out-of-step protection device testing under close-to-real power system operation conditions. The power system stability modelling software is used as a source of test signals. The accurate model of power system in conjunction with dynamical modelling features allows to verify the reliability of OOS protection scheme under consideration as also allows the device settings correction, if necessary. The methodology allows to test the real device with signals waveforms which are hardly obtainable using traditional testing technique. 展开更多
关键词 Out-of-step relay modelling software EUROSTAG relay testing COMTRADE format.
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Impact of Wind Integration on Transient Voltage Stability in Regional Grid 被引量:1
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作者 Zhang Feng Li Mingxia +2 位作者 Fan Guowei Luo Zhongyou Chang Xiqiang 《Electricity》 2012年第2期20-25,共6页
With the increasing development of wind power,the scale of wind farms and unit capacity of wind turbines are getting larger and larger,and the impact of wind integration on power systems cannot be ignored.However,in m... With the increasing development of wind power,the scale of wind farms and unit capacity of wind turbines are getting larger and larger,and the impact of wind integration on power systems cannot be ignored.However,in most cases,the areas with a plenty of wind resources do not have strong grid structures.Furthermore,the characteristics of wind power dictate that wind turbines need to absorb reactive power during operation.Because of the strong correlation between voltage stability and systems' reactive power,the impacts of wind integration on voltage stability has become an important issue.Based on the power system simulation software DIgSILENT and combined analysis of actual practice,this paper investigates the impacts of two types of wind farms on voltage stability:namely a type of wind farms which are constituted by constant speed wind turbines based on common induction generators(IG) and another type of wind farms which are constituted by VSCF wind turbines based on doubly-fed induction generators(DFIG).Through investigation the critical fault clearing time is presented for different outputs of wind farms.Moreover,the impacts of static var compensator(SVC) and static synchronous compensator(STATCOM) on transient voltage stability in IG-based wind farms are studied to improve the security and stability of the Jiangsu power grid after the integration of large scale wind power. 展开更多
关键词 wind farm transient voltage stability dynamic reactive power compensation
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Evaluation of cracking potential for concrete arch dam based on simulation feedback analysis 被引量:10
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作者 FU ShaoJun HE Ting +3 位作者 WANG GuoJin ZHANG ShiHu ZOU LiChun CHEN ShengHong 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第3期565-572,共8页
It is still very difficult for researchers and engineers to implement the simulation analysis including a complete process and a full model with the complicated arch dam and the foundation, and to evaluate the crackin... It is still very difficult for researchers and engineers to implement the simulation analysis including a complete process and a full model with the complicated arch dam and the foundation, and to evaluate the cracking potential in the construction and service periods. To take Xiaowan project of China for an example, a practical system of simulation feedback analysis, a specific cracking criterion, and a resolution for the conflicting requirements of temperature and stress/strain simulation are presented, which are put into a successful practice. The simulation results of temperature, stress, and cracking are identical well with the monitor data. A modified temperature control measure is propounded, and the significant effect is gained by adopting the new scheme. 展开更多
关键词 arch dam cracking potential construction process finite element method simulation feedback analysis
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Modeling and simulation of non-linear dynamic process of the induction motor system with fluctuating potential loads 被引量:13
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作者 LUO Wei WANG Bo +1 位作者 ZHAO HaiSen LUO YingLi 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第9期1729-1737,共9页
The induction motor system with fluctuating potential loads is a non-linear complex electro-mechanical system.With beam pumping motors as an example,this paper proposes a multiple factor non-linear mathematical model ... The induction motor system with fluctuating potential loads is a non-linear complex electro-mechanical system.With beam pumping motors as an example,this paper proposes a multiple factor non-linear mathematical model to study the operating performance of the induction motor system.This model consists of non-linear time varying electromagnetic field equations,mechanical wave equations of sucker rods and non-linear coupling equation of reducer and four-bar linkage.The equations are numerically solved by combining time-step finite element method(TS-FEM),finite difference method(FDM),a linear dimension reduction method and the Newton-Raphson method.Simulation results,which are validated by experiments,reveal the influence of the fluctuating potential load on magnetic field distributions,stator and rotor currents,the input power and the power factor.The model and simulation results provide theoretical and technical supports for subsequent researches on model simplification and energy saving technologies. 展开更多
关键词 induction motors electromagnetic field equation wave equations TS-FEM finite difference method
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