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动态模数法在大型铸钢件冒口设计中的应用 被引量:2
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作者 华勤 顾超 《热加工工艺》 CSCD 北大核心 1997年第4期43-44,共2页
依据动态模数理论建立有关冒口尺寸的三次方程,用二分法在计算机上进行数值求解,可快速计算出冒口尺寸.该法在实际生产中运用,获得了满意的效果.
关键词 动态模数 冒口 设计 计算机应用 铸钢件
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冒口设计的动态模数新求解法及其CAD
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作者 李志平 单钢毅 +2 位作者 张贺新 赵成志 汪松 《热加工工艺》 CSCD 北大核心 2017年第1期95-98,103,共5页
模数的三次方程法提出已有多年了,有几个问题制约了该方法的使用,一是三次方程的求解方法不够简便,需要解三次方程和编程;二是原三次方程模数法的处理存在问题,需要解决。本研究提出函数法,逆向求解三次方程的问题。引入了f值,修正了原... 模数的三次方程法提出已有多年了,有几个问题制约了该方法的使用,一是三次方程的求解方法不够简便,需要解三次方程和编程;二是原三次方程模数法的处理存在问题,需要解决。本研究提出函数法,逆向求解三次方程的问题。引入了f值,修正了原方法中冒口模数与铸件模数的比例关系。并且运用软件功能对原来依靠近似计算方法得到的数据进行更精确计算,并进行了可视化研究。 展开更多
关键词 冒口设计 动态模数 计算机辅助 函数法
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用动态模数法求解铸钢件冒口尺寸 被引量:3
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作者 李弘英 赵成志 《铸造》 CAS CSCD 北大核心 1994年第10期38-39,共2页
从铸件─冒口凝固体系的体积动态变化过程分析,提出了动态凝固模数的概念,推导出求解冒口尺寸的三次方程式。用Aitken方法对求解冒口的三次方程在计算机上进行迭代处理,可快速地计算出冒口尺寸和冒口重量,生成因素和进行相应... 从铸件─冒口凝固体系的体积动态变化过程分析,提出了动态凝固模数的概念,推导出求解冒口尺寸的三次方程式。用Aitken方法对求解冒口的三次方程在计算机上进行迭代处理,可快速地计算出冒口尺寸和冒口重量,生成因素和进行相应尺寸和文字的标注,具有实用价值。 展开更多
关键词 动态模数 冒口 CAD 铸件
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最大动态剪力模数次增加率之预测 被引量:1
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作者 李咸亨 蔡宗儒 陈东扬 《岩土工程学报》 EI CAS CSCD 北大核心 1995年第3期10-18,共9页
正规化最大动态剪力模数次增加率N_g之观念虽然已被提出,但是其影响因素之精确指标仍待后人研究。因此,本文深入探讨粘性土壤在现场有效覆土压力长期作用下,时间效应对最大动态剪力模数G_(max)之影响,并与剪力波速回归公... 正规化最大动态剪力模数次增加率N_g之观念虽然已被提出,但是其影响因素之精确指标仍待后人研究。因此,本文深入探讨粘性土壤在现场有效覆土压力长期作用下,时间效应对最大动态剪力模数G_(max)之影响,并与剪力波速回归公式作比较,以期达到预测N_g值之目标。在一般物理性质对时间效应之影响研究中,N_g值有随塑性指数I_p值增加之趋势,而平均颗粒粒径D_(50)愈小时,N_g值愈大,且重模试体之N_g值较原状试体为小。由本文之N_g-I_p-C值之关系可知,粘土含量C相同时,若I_p值愈大,则N_g愈大。而N_g-I_p-C_a值三者之关系中,若二次压缩指数C_a值相同,则I_p值愈大时,N_g值愈大。 展开更多
关键词 粘性土 动态模数 次压缩 塑性指数 预测
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Multi-dimension and multi-modal rolling mill vibration prediction model based on multi-level network fusion
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作者 CHEN Shu-zong LIU Yun-xiao +3 位作者 WANG Yun-long QIAN Cheng HUA Chang-chun SUN Jie 《Journal of Central South University》 SCIE EI CAS CSCD 2024年第9期3329-3348,共20页
Mill vibration is a common problem in rolling production,which directly affects the thickness accuracy of the strip and may even lead to strip fracture accidents in serious cases.The existing vibration prediction mode... Mill vibration is a common problem in rolling production,which directly affects the thickness accuracy of the strip and may even lead to strip fracture accidents in serious cases.The existing vibration prediction models do not consider the features contained in the data,resulting in limited improvement of model accuracy.To address these challenges,this paper proposes a multi-dimensional multi-modal cold rolling vibration time series prediction model(MDMMVPM)based on the deep fusion of multi-level networks.In the model,the long-term and short-term modal features of multi-dimensional data are considered,and the appropriate prediction algorithms are selected for different data features.Based on the established prediction model,the effects of tension and rolling force on mill vibration are analyzed.Taking the 5th stand of a cold mill in a steel mill as the research object,the innovative model is applied to predict the mill vibration for the first time.The experimental results show that the correlation coefficient(R^(2))of the model proposed in this paper is 92.5%,and the root-mean-square error(RMSE)is 0.0011,which significantly improves the modeling accuracy compared with the existing models.The proposed model is also suitable for the hot rolling process,which provides a new method for the prediction of strip rolling vibration. 展开更多
关键词 rolling mill vibration multi-dimension data multi-modal data convolutional neural network time series prediction
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Imaging simulation and analysis of attitude jitter effect on topographic mapping for lunar orbiter stereo optical cameras
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作者 CHEN Chen TONG Xiao-Hua +4 位作者 LIU Shi-Jie YE Zhen HUANG Chao-Wei WU Hao ZHANG Han 《红外与毫米波学报》 SCIE EI CAS CSCD 北大核心 2024年第5期722-730,共9页
The geometric accuracy of topographic mapping with high-resolution remote sensing images is inevita-bly affected by the orbiter attitude jitter.Therefore,it is necessary to conduct preliminary research on the stereo m... The geometric accuracy of topographic mapping with high-resolution remote sensing images is inevita-bly affected by the orbiter attitude jitter.Therefore,it is necessary to conduct preliminary research on the stereo mapping camera equipped on lunar orbiter before launching.In this work,an imaging simulation method consid-ering the attitude jitter is presented.The impact analysis of different attitude jitter on terrain undulation is conduct-ed by simulating jitter at three attitude angles,respectively.The proposed simulation method is based on the rigor-ous sensor model,using the lunar digital elevation model(DEM)and orthoimage as reference data.The orbit and attitude of the lunar stereo mapping camera are simulated while considering the attitude jitter.Two-dimensional simulated stereo images are generated according to the position and attitude of the orbiter in a given orbit.Experi-mental analyses were conducted by the DEM with the simulated stereo image.The simulation imaging results demonstrate that the proposed method can ensure imaging efficiency without losing the accuracy of topographic mapping.The effect of attitude jitter on the stereo mapping accuracy of the simulated images was analyzed through a DEM comparison. 展开更多
关键词 topographic mapping lunar orbiter stereo camera attitude jitter imaging simulation digital elevation model
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铝渣骨材作为混凝土粗细骨材再利用的研究 被引量:3
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作者 刘宏敏 《硅酸盐通报》 CAS CSCD 北大核心 2016年第2期655-659,669,共6页
本文探讨铝渣骨材作为混凝土粗细骨材再利用的工程特性研究,尝试以铝渣经安定化处理后和波索兰材料调配、混拌、滚动、造粒成粒径大小不等球状粗细骨材,再制作成混凝土,并探讨养护时间、抗压强度、弹性模数等关系,并进行一系列试验,再... 本文探讨铝渣骨材作为混凝土粗细骨材再利用的工程特性研究,尝试以铝渣经安定化处理后和波索兰材料调配、混拌、滚动、造粒成粒径大小不等球状粗细骨材,再制作成混凝土,并探讨养护时间、抗压强度、弹性模数等关系,并进行一系列试验,再以回归方式获得相互间关系曲线,以作为日后工程界设计与施工参考。由研究结果显示,铝渣以C6-S51-ASFA43配比制作粗细骨材,其成份及强度与一般骨材相似,对于土壤、地下水等自然环境应不致造成影响与污染。在铝渣骨材混凝土方面,其弹性模数、动态弹性模数均随抗压强度平方根增加而增加,泊松比均随养护时间增长而呈现Y=-0.0007X+0.2801缓慢下降趋势,逐渐接近脆性破坏模式。在其弹性模数经回归后E=8367.2 f'c,其动弹性模数经回归后Ed=9020.6 f'c较接近ACI C363中E=3320 f'c+6900。 展开更多
关键词 铝渣骨材 安定化处理 抗压强度 弹性模数 动态弹性模数
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Analysis of the Elastic-Plastic Dynamic Finite Element on a Jointed Rock Mass 被引量:1
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作者 郭文章 冯顺山 王海福 《Journal of Beijing Institute of Technology》 EI CAS 1999年第2期27-32,共6页
Aim To study the elastic plastic dynamical constitutive relations about a jointed rock mass under explosion load and its computer simulation. Methods\ Stress history is taken into account and stresses will follow ch... Aim To study the elastic plastic dynamical constitutive relations about a jointed rock mass under explosion load and its computer simulation. Methods\ Stress history is taken into account and stresses will follow changes in time during a period of explosion load. According to the principle of static force balance, the corresponding nodal concentrated force is calculated and the nodal displacement is counted. The elastic plastic dynamic finite element equations are thus obtained. Results\ A finite element method is given for a jointed rock mass under explosion load. Conclusion\ The problem of large plastic deformation for jointed rock mass on blasting was efficiently resolved through dynamic finite element analysis and the range of damages by blasting simulated, and this pushes forward the problem to engineering practice. 展开更多
关键词 jointed rock mass dynamic finite element numerical simulation
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Numerical simulation of dynamic surface deformation based on DInSAR monitoring 被引量:2
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作者 阎跃观 戴华阳 +3 位作者 葛林林 郭俊廷 AlexHay-ManNG 李晓静 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第4期1248-1254,共7页
Differential interferometric synthetic aperture radar (DInSAR) technology is a new method to monitor the dynamic surface subsidence. It can monitor the large scope of dynamic deformation process of surface subsidenc... Differential interferometric synthetic aperture radar (DInSAR) technology is a new method to monitor the dynamic surface subsidence. It can monitor the large scope of dynamic deformation process of surface subsidence basin and better reflect the surface subsidence form in different stages. But under the influence of factors such as noise and other factors, the tilt and horizontal deformation curves regularity calculated by DInSAR data are poorer and the actual deviation is larger. The tilt and horizontal deformations are the important indices for the safety of surface objects protection. Numerical simulation method was used to study the dynamic deformation of LW32 of West Cliff colliery in Australia based on the DInSAR monitoring data. The result indicates that the subsidence curves of two methods fit well and the correlation coefficient is more than 95%. The other deformations calculated by numerical simulation results are close to the theory form. Therefore, considering the influence, the surface and its subsidiary structures and buildings due to mining, the numerical simulation method based on the DInSAR data can reveal the distribution rules of the surface dynamic deformation values and supply the shortcomings of DInSAR technology. The research shows that the method has good applicability and can provide reference for similar situation. 展开更多
关键词 DInSAR monitoring numerical simulation dynamic surface deformation SUPPLEMENT
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Three-Dimensional Dynamic Modeling of a Tangentially Fired Utility Boiler Furnace
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作者 冷伟 徐治皋 《Journal of Southeast University(English Edition)》 EI CAS 2002年第4期315-318,共4页
The tangentially fired utility boiler furnace is divided into several sections. The dynamic mathematical models for each section are presented. In the combustion zone, three dimensional model is used, while for the up... The tangentially fired utility boiler furnace is divided into several sections. The dynamic mathematical models for each section are presented. In the combustion zone, three dimensional model is used, while for the upper sections, lumped parameter model is used instead. With the combination of different models, we can get detailed distributions of gas velocity, temperature, chemical species, heat flux, etc. in the furnace, but with less CPU time. The radiation through the interfaces of each section is cons... 展开更多
关键词 dynamic model numerical simulation BOILER FURNACE
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Habitat evaluation for target species following deep-water channel project in the Yangtze River
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作者 徐宿东 李锐 殷锴 《Journal of Southeast University(English Edition)》 EI CAS 2015年第4期559-565,共7页
In order to optimize the design of a 12.5 m deepwater channel project and protect the ecological environment, it is necessary to study the habitat evaluation of species in the engineered area. A coupled eco-hydrodynam... In order to optimize the design of a 12.5 m deepwater channel project and protect the ecological environment, it is necessary to study the habitat evaluation of species in the engineered area. A coupled eco-hydrodynamic model, which combines a hydrodynamic model (ADCIRC) and a habitat suitability index (HSI) model is developed for target fish (Coilia nasus) and benthos (Corbicula fluminea) in the Yangtze River in order to predict the ecological changes and optimize the regulation scheme. Based on the existing research concerning the characteristics of Coilia nasus and Corbicula fluminea, the relationship between the target species and water environment factors is established. The verification results of tidal level, velocity and biological density show that the proposed coupling model performs well when predicting ecological suitability in the studied region. The results indicate a slight improvement in the potential habitat availability for the two species studied as the natural hydraulic conditions change after the deep-water channel regulation works. 展开更多
关键词 deep-water channel project hydrodynamic model habitat suitability index ecological engineering
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德国企业的生产组织
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作者 陈云卿 《管理观察》 1997年第7期18-18,共1页
关键词 德国企业 动态模数 结构调整 产品竞争力 生产组织 提高效益 生产原则 降低成本 材料运输 提高效率
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A New CMOS Image Sensor with a High Fill Factor and the Dynamic Digital Double Sampling Technique
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作者 刘宇 王国裕 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2006年第2期313-317,共5页
A single CMOS image sensor based on a 0.35μm process along with its design and implementation is introduced. The architecture of an active pixel sensor is used in the chip. The fill factor of a pixel cell can reach 4... A single CMOS image sensor based on a 0.35μm process along with its design and implementation is introduced. The architecture of an active pixel sensor is used in the chip. The fill factor of a pixel cell can reach 43%,higher than the traditional factor of 30%. Moreover, compared with the conventional method whose fixed pattern noise (FPN) is around 0.5%, a dynamic digital double sampling technique is developed, which possesses simpler circuit architecture and a better FPN suppression outcome. The CMOS image sensor chip is implemented in the 0.35μm mixed signal process of a Chartered by MPW. The experimental results show that the chip operates welt,with an FPN of about 0.17%. 展开更多
关键词 active pixel CMOS image sensor fill factor dynamic digital double sampling fixed pattern noise
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Stress initialization methods for dynamic numerical simulation of rock mass with high in-situ stress 被引量:20
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作者 YANG Jia-cai LIU Ke-wei +1 位作者 LI Xu-dong LIU Zhi-xiang 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第10期3149-3162,共14页
In the context of deep rock engineering,the in-situ stress state is of major importance as it plays an important role in rock dynamic response behavior.Thus,stress initialization becomes crucial and is the first step ... In the context of deep rock engineering,the in-situ stress state is of major importance as it plays an important role in rock dynamic response behavior.Thus,stress initialization becomes crucial and is the first step for the dynamic response simulation of rock mass in a high in-situ stress field.In this paper,stress initialization methods,including their principles and operating procedures for reproducing steady in-situ stress state in LS-DYNA,are first introduced.Then the most popular four methods,i.e.,explicit dynamic relaxation(DR)method,implicit-explicit sequence method,Dynain file method and quasi-static method,are exemplified through a case analysis by using the RHT and plastic hardening rock material models to simulate rock blasting under in-situ stress condition.Based on the simulations,it is concluded that the stress initialization results obtained by implicit-explicit sequence method and dynain file method are closely related to the rock material model,and the explicit DR method has an obvious advantage in solution time when compared to other methods.Besides that,it is recommended to adopt two separate analyses for the whole numerical simulation of rock mass under the combined action of in-situ stress and dynamic disturbance. 展开更多
关键词 in-situ stress stress initialization method dynamic disturbance numerical simulation rock mass
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Dynamic response and numerical simulation of Al-Sc and Al-Ti alloys under high-speed impact
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作者 张伟贵 何良菊 +3 位作者 李培杰 叶益聪 冯雪 L.S.NOVIKOV 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第2期559-570,共12页
Al-Sc and Al-Ti semi-infinite targets were impacted by high-speed projectiles at velocities of 0.8, 1.0, 1.2 and 1.5 km/s, respectively. It is found that the Al-Sc targets demonstrate more excellent ability to resist ... Al-Sc and Al-Ti semi-infinite targets were impacted by high-speed projectiles at velocities of 0.8, 1.0, 1.2 and 1.5 km/s, respectively. It is found that the Al-Sc targets demonstrate more excellent ability to resist high-speed impact. It is concluded that different microstructures of Al-Sc and Al-Ti alloys, including different grain sizes and secondary particles precipitated in the matrix, result in their greatly different capabilities of resisting impact. Furthermore, the effect of the size range ofnanoscale A13Sc precipitate in A1-Sc alloy on the resistance of high-speed impact was investigated. In addition, computer simulations and validation of these simulations were developed which fairly accurately represented residual crater shapes/geometries. Validated computer simulations allowed representative extrapolations of impact craters well beyond the laboratory where melt and solidification occurred at the crater wall, especially for hypervelocity impact (〉5 km/s). 展开更多
关键词 Al-Sc alloy Al-Ti alloy AL3SC high-speed impact dynamic response numerical simulation
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A practical nonlinear controller for levitation system with magnetic flux feedback 被引量:4
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作者 李金辉 李杰 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第7期1729-1739,共11页
This work proposes a practical nonlinear controller for the MIMO levitation system. Firstly, the mathematical model of levitation modules is developed and the advantages of the control scheme with magnetic flux feedba... This work proposes a practical nonlinear controller for the MIMO levitation system. Firstly, the mathematical model of levitation modules is developed and the advantages of the control scheme with magnetic flux feedback are analyzed when compared with the current feedback. Then, a backstepping controller with magnetic flux feedback based on the mathematical model of levitation module is developed. To obtain magnetic flux signals for full-size maglev system, a physical method with induction coils installed to winding of the electromagnet is developed. Furthermore, to avoid its hardware addition, a novel conception of virtual magnetic flux feedback is proposed. To demonstrate the feasibility of the proposed controller, the nonlinear dynamic model of full-size maglev train with quintessential details is developed. Based on the nonlinear model, the numerical comparisons and related experimental validations are carried out. Finally, results illustrating closed-loop performance are provided. 展开更多
关键词 MAGLEV levitation system BACKSTEPPING magnetic flux
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NH_3-N Degradation Dynamics and Calculating Model of Filtration Bed Height in Constructed Soil Rapid Infiltration 被引量:7
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作者 XU Wenlai ZHANG Jianqiang LIU Yun 《Chinese Geographical Science》 SCIE CSCD 2011年第6期637-645,共9页
The research on Constructed Soil Rapid Infiltration(CSRI) system is in its infancy at home and abroad.There are several details about the mechanism and application of CSRI system needed to be further studied.A major l... The research on Constructed Soil Rapid Infiltration(CSRI) system is in its infancy at home and abroad.There are several details about the mechanism and application of CSRI system needed to be further studied.A major limitation in the current research is the absence of degradation dynamics of pollutants,and the height of filtration bed in CSRI system currently determined by empirical judgment lacks accuracy and logicality.To solve these two prob-lems,the soil column of CSRI system was utilized to treat domestic wastewater,meanwhile,the NH3-N degradation dynamics were studied according to the Monod equation,the research of Mann A T and the NH3-N degradation law.Then the mathematical model of filtration bed height was built based on NH3-N degradation dynamics equation in the soil column.It has been proven that within a limited range this model can calculate the appropriate height of filtration bed accurately in order to optimize technological parameters of hydraulic load and the concentration of influent NH3-N,improving the effluent quality of CSRI system. 展开更多
关键词 degradation dynamics Monod equation domestic wastewater filtration bed height NH3-N constructedsoil rapid infiltration
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Salt-Water Transport in Unsaturated Soils Under Crop Planting: Dynamics and Numerical Simulation 被引量:7
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作者 XU Li-Gang YANG Jing-Song +1 位作者 ZHANG Qi LIU Guang-Ming 《Pedosphere》 SCIE CAS CSCD 2005年第5期634-640,共7页
A laboratory salt-water dynamics experiment using unsaturated soils in packed silt loam and clay soil columns withdifferent soil texture profiles and groundwater levels under crops were conducted to study the changes ... A laboratory salt-water dynamics experiment using unsaturated soils in packed silt loam and clay soil columns withdifferent soil texture profiles and groundwater levels under crops were conducted to study the changes of salt-waterdynamics induced by water uptake of crops and to propose the theoretical basis for the regulation and control of salt-water dynamics as well as to predict salinity levels. The HYDRUS 1D model was applied to simulate the one-dimensionalmovement of water and salt transport in the soil columns. The results showed that the salts mainly accumulated in theplow layer in the soil columns under crops. Soil water and salt both moved towards the plow layer due to soil waterabsorption by the crop root system. The salt contents in the column with lower groundwater were mostly greater thanthose with high groundwater. The water contents in the soil columns increased from top to the bottom due to plant rootwater uptake. The changes in groundwater level had little influence on water content of the root zone in the soil columnswith crop planting. Comparison between the simulated and the determined values showed that model simulation resultswere ideal, so it is practicable to do numerical simulation of soil salt and water transport by the HYDRUS 1D model.Furthermore, if the actual movement of salt and water in fields is to be described in detail, much work needs to be done.The most important thing is to refine the parameters and select precise boundary conditions. 展开更多
关键词 crop planting numerical simulation salt accumulation salt-water dynamics
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Dynamic experiment and numerical simulation of solute transmission in heap leaching processing 被引量:3
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作者 刘金枝 吴爱祥 +1 位作者 杨保华 江怀春 《Journal of Central South University of Technology》 EI 2007年第6期838-841,共4页
Solute transmission in saturated ore heap was studied numerically and experimentally. The convection-diffusion equation (CDE) used to describe the mass transportation in porous media was solved by characteristic diffe... Solute transmission in saturated ore heap was studied numerically and experimentally. The convection-diffusion equation (CDE) used to describe the mass transportation in porous media was solved by characteristic difference method to give the distribution of the concentration of ferrous ion in the ore column. To calibrate the computational model, a column test was performed using infiltration of sulfide ferrous solution (the initial concentration is c0=0.04 mol/L) on a 100 cm high column composed of ore particles smaller than 10 mm for 2.5 h. The numerical analysis shows that the results obtained from numerical modeling under the same operating conditions as used for column test are in good agreement with those from experimental procedure on the whole trend, which indicates that the model, the numerical method, and the parameters chosen can reflect the rule of ferrous ion transmission in ore heap. 展开更多
关键词 heap leaching solute transmission dynamic experiment numerical solution
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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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