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Analysis of the thermal profile of work rolls in the hot strip rolling process 认领 引用 被引量：10
1
作者 XuanliZhang JieZhang +2 位作者 XiaoyanLi HaixiaLi GangchengWei 《Journal of University of Science and Technology Beijing》 2004年第2期173-177,共5页
A 2-dimension axisymmetric model was developed by the finite-differencemethod, which can be used to predict the transient temperature field and thermal profile of workrolls in the hot strip rolling process. To demonst... A 2-dimension axisymmetric model was developed by the finite-differencemethod, which can be used to predict the transient temperature field and thermal profile of workrolls in the hot strip rolling process. To demonstrate the accuracy and reliability of the solutiondeveloped, the calculation results were compared with the production data of a 1700 mm hot striprolling mill and good agreement was found between them. The effect of strip width and roll shiftingon the thermal expansion of the work rolls was studied. It is found that the strip width has markedeffect on the efficient thermal crown. Initially, when the rolling strip changes from narrow towide, a bigger efficient thermal crown can be quickly achieved; afterwards, when the rolling stripchanges from wide to narrow, not only the influence of uneven wear can be reduced but also theexcessive efficient thermal crown can be avoided. It is also found that the work roll shifting has adeterminate but not obvious effect on the reduction of the efficient thermal crown, and will makethe strip shape unstable without being used properly. 展开更多
关键词 hot strip rolling temperature field thermal crown finite-difference method
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Mathematical model for the thermal process of controlled cooling of wires and its numerical simulation 认领 引用 被引量：2
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作者 HongxiangZhu XiaohongHao +2 位作者 ZhiWen YaogenZhang HuqiuChen 《Journal of University of Science and Technology Beijing》 2004年第6期505-510,共6页
The mathematical model for the thermal process of billets rolling has beenestablished, including transporting in air and temperature-holding cover, descaling withhigh-pressure water, and the process of rolling and coo... The mathematical model for the thermal process of billets rolling has beenestablished, including transporting in air and temperature-holding cover, descaling withhigh-pressure water, and the process of rolling and cooling in water box. The calculated data by themodel have been compared with the measured data and the results show that the model is right andcreditable. Based on the model, the main thermal characters of rolling line have been simulated andthe influence of all the parameters on the temperature of rolling has been analyzed. 展开更多
关键词 wire controlled cooling mathematical model numerical simulation
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Similarity solution to a heat equation with convection in an infinite medium 认领 引用 被引量：1
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作者 LiancunZheng XinxinZhang JichengHe 《Journal of University of Science and Technology Beijing》 2003年第4期29-32,共4页
A second order heat equation with convection in an infinite medium isstudied. Suitable similarity transformations are used to reduce the parabolic heat equation to aClass of singular nonlinear boundary value problems.... A second order heat equation with convection in an infinite medium isstudied. Suitable similarity transformations are used to reduce the parabolic heat equation to aClass of singular nonlinear boundary value problems. Numerical solutions are presented for differentrepresehtations of heat conduction, heat convection, heat flux, and power law parameters byutilizing the shooting technique. The results reveal the heat transfer characteristic and the effectof parameters on the solutions. 展开更多
关键词 heat transfer parabolic equation nonlinear boundary value problem positivesolution shooting technique.
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Analytical solutions to a compressible boundary layer problem with heat transfer 认领 引用 被引量：1
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作者 LiancunZheng XinxinZhang JichengHe 《Journal of University of Science and Technology Beijing》 2004年第2期120-122,共3页
The problem of momentum and heat transfer in a compressible boundary layerbehind a thin expansion wave was solved by the application of the similarity transformation and theshooting technique. Utilizing the analytical... The problem of momentum and heat transfer in a compressible boundary layerbehind a thin expansion wave was solved by the application of the similarity transformation and theshooting technique. Utilizing the analytical expression of a two-point boundary value problem formomentum transfer, the energy boundary layer solution was represented as a function of thedimensionless velocity, and as the parameters of the Prandtl number, the velocity ratio, and thetemperature ratio. 展开更多
关键词 compressible boundary layer momentum and heat transfer analytical solution
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Drag Force of Non—newtonian Fluid on a Continuous Moving Surface with Strong Suction/Blowing 认领 引用 被引量：10
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作者 ZHENGLian-Cun ZHANGXin-Xin HEJi-Cheng 《Chinese Physics Letters》 SCIE EI CAS 2003年第6期858-861,共4页
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Free boundary value problems for a class of generalized diffusion equation 认领 引用 被引量：1
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作者 LiancunZheng XinxinZhang 《Journal of University of Science and Technology Beijing》 2002年第6期422-425,共4页
The transport behavior of free boundary value problems for a class ofgeneralized diffusion equations was studied. Suitable similarity transformations were used toconvert the problems into a class of singular nonlinear... The transport behavior of free boundary value problems for a class ofgeneralized diffusion equations was studied. Suitable similarity transformations were used toconvert the problems into a class of singular nonlinear two-point boundary value problems andsimilarity solutions were numerical presented for different representations of heat conductionfunction, convection function, heat flux function, and power law parameters by utilizing theshooting technique. The results revealed the flux transfer mechanism and the character as well asthe effects of parameters on the solutions. 展开更多
关键词 free boundary value problem generalized diffusion equation nonlinearboundary problem shooting technique
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An Approximately Analytical Solution for the Marangoni Convection in an In-Ga-Sb System 认领 引用 被引量：5
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作者 郑连存 陈学慧 +1 位作者 张欣欣 赫冀成 《Chinese Physics Letters》 SCIE EI CAS 2004年第10期1983-1985,共3页
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Similarity solutions to a laminar boundary layer problem in power law fluids 认领 引用 被引量：1
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作者 LiancunZheng XinxinZhang 《Journal of University of Science and Technology Beijing》 2002年第2期104-106,共3页
A suitable similarity transformation is introduced to reduce the laminarboundary layer equations of power law fluids to a class of singular nonlinear two-point boundaryvalue problems. The kin friction and shear stress... A suitable similarity transformation is introduced to reduce the laminarboundary layer equations of power law fluids to a class of singular nonlinear two-point boundaryvalue problems. The kin friction and shear stress distributions for boundary layer flow over amoving flat plate are investigated by utilizing the shooting technique. Results indicate that foreach fixed value of the power law exponent n or the velocity ratio parameter xi, the skin frictionand shear stress decrease with the increasing of n or xi respectively. 展开更多
关键词 boundary layer skin friction similarity solution shooting technique
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Mathematical model on heat transfer of water-cooling steel-stick bottom electrode of DC electric arc furnace 认领 引用 被引量：1
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作者 HaiXu XiaoLiu 《Journal of University of Science and Technology Beijing》 2002年第5期338-342,共5页
For predicting and controlling the melted depth of bottomelectrode during the process of steelmaking, the water-cooling steel-stick electrode is taken as an example, to analyze the process ofheat transfer, then 3D mat... For predicting and controlling the melted depth of bottomelectrode during the process of steelmaking, the water-cooling steel-stick electrode is taken as an example, to analyze the process ofheat transfer, then 3D mathematical model by control capacity methodis built. At the same time, the measurement on the melted depth ofbottom electrode is conducted which verified the correctness of thebuilt mathematical model. On the base of verification, all kinds ofkey parameters are calculated through the application and a series ofresults are simulated. Finally, the optimum parameters are found andthe service life of bottom electrode is prolonged. 展开更多
关键词 DC electric arc furnace water-cooling steel-stick electrode mathematicalmodel heat transfer
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Bifurcation Behaviour in the Reverse—Flow Boundary Layer with Special Injection or Suction 认领 引用 被引量：9
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作者 郑连存 张欣欣 《Chinese Physics Letters》 SCIE EI CAS 2003年第1期83-86,共4页
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Temperature distribution and control in liquefied petroleum gas fluidized beds 认领 引用
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作者 LiWang PingWu +2 位作者 YanpingZhang JingYang LigeTong 《Journal of University of Science and Technology Beijing》 2004年第3期202-206,共5页
Temperature distribution and control have been investigated in a liquefiedpetroleum gas (LPG) fluidized bed with hollow corundum spheres (A1_2O_3) of 0.867-1.212 mm indiameter at moderately high temperatures (800-1100... Temperature distribution and control have been investigated in a liquefiedpetroleum gas (LPG) fluidized bed with hollow corundum spheres (A1_2O_3) of 0.867-1.212 mm indiameter at moderately high temperatures (800-1100℃). Experiments were carried out for the airconsumption coefficient α in the range of 0.3 to 1.0 and the fluidization number N in the range of1.3 to 3.0. Particle properties, initial bed height, α and N all affect temperature distribution inthe bed. Bed temperature can be adjusted about 200℃ by combined the adjusting of α and N. 展开更多
关键词 liquefied petroleum gas fluidized bed temperature distribution
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Application of simulated annealing algorithm to improve work roll wear model in plate mills 认领 引用
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作者 LinSun QingdongZhang 《Journal of University of Science and Technology Beijing》 2002年第3期224-227,共4页
Employing Simulated Annealing Algorithm (SAA) and many measured data, acalculation model of work roll wear was built in the 2 800 mm 4-high mill of Wuhan Iron and Steel(Group) Co. (WISCO). The model was a semi-theory ... Employing Simulated Annealing Algorithm (SAA) and many measured data, acalculation model of work roll wear was built in the 2 800 mm 4-high mill of Wuhan Iron and Steel(Group) Co. (WISCO). The model was a semi-theory practical formula. Its pattern and magnitude werestill hardly defined with classical optimization methods. But the problem could be resolved by SAA.It was pretty high precision to predict the values for the wear profiles of work roll in a rollingunit. After one-year application, the results show that the model is feasible in engineering, and itcan be applied to predict the wear profiles of work roll in other mills. 展开更多
关键词 plate mill work roll wear simulated annealing algorithm profile andflatness
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Numerical simulation of circular jet impinging on hot steel plate 认领 引用 被引量：2
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作者 FengliWang MouweiLi +1 位作者 YanqiuZhao FengfuYin 《Journal of University of Science and Technology Beijing》 2002年第4期262-264,共3页
Flow structure and heat transfer characteristics of an axisymmetric circularjet impinging on a hot 1Cr18Ni9Ti medium plate have been simulated numerically using computationalfluid dynamic (CFD) code. The relation betw... Flow structure and heat transfer characteristics of an axisymmetric circularjet impinging on a hot 1Cr18Ni9Ti medium plate have been simulated numerically using computationalfluid dynamic (CFD) code. The relation between flow field of jet impingement and its heat transfercapability is analyzed, and the phenomenon that heat transfer at stagnation point is smaller thanthat of points directly around is discussed. The simulation result provides boundary conditions forthermal analysis of medium plate quenching. 展开更多
关键词 heat transfer impinging jet quenching numerical simulations
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Theoretical modeling of cutting temperature in high-speed end milling process for die/mold machining 认领 引用 被引量：4
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作者 YingTang 《Journal of University of Science and Technology Beijing》 2005年第1期90-95,共6页
A parametric model of cutting temperature generated in end milling process is developed according to the thermal mechanism of end milling as an intermittent operation, which periodically repeats the cycle of heating u... A parametric model of cutting temperature generated in end milling process is developed according to the thermal mechanism of end milling as an intermittent operation, which periodically repeats the cycle of heating under cutting and cooling under non-cutting. It shows that cutting speed and the tool-workpiece engagement condition are determinative for tool temperature in the operation. The suggested model was investigated by tests of AlTiN coated endmill machining hardened die steel JIS SKD61, where cutting temperature on the flank face of tool was measured with an optical fiber type radiation thermometer. Experimental results show that the tendency of cutting temperature to increase with cutting speed and engagement angle is intensified with the progressing tool wear. 展开更多
关键词 end milling cutting temperature intermittent cutting die/mold machining
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Feedback control strategy of longitudinal temperature and finished carbonization time for coke oven and its application 认领 引用
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作者 FangHuo ZhiWen +3 位作者 DongChen YuelingShen YongqinZhang XiaomingZhi 《Journal of University of Science and Technology Beijing》 2004年第2期110-114,共5页
Based on the detailed analysis of the third coke oven in BaoSteel, a feedbackcontrol strategy of longitudinal temperature and finished carbonization time of coke ovens wasproposed and it was applied to the third coke ... Based on the detailed analysis of the third coke oven in BaoSteel, a feedbackcontrol strategy of longitudinal temperature and finished carbonization time of coke ovens wasproposed and it was applied to the third coke oven in BaoSteel. As a result, the ratio of theinstance that the absolute deviation of the longitudinal temperature is within +- 7 deg C and thefinished carbonization time within +- 10 min is more than 80 percent, having acquired the patentsaving effect of an energy consumption lowered by 2.92 percent. At the same time, it can provide anexample for the same coke ovens inside and outside the nation. 展开更多
关键词 coke oven longitudinal temperature mathematical model finishedcarbonization time feedback control strategy
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Experiment research on grain drying process in the heat pump assisted fluidized beds 认领 引用 被引量：8
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作者 JingYang LiWang FiXiang LigeTong HuaSu 《Journal of University of Science and Technology Beijing》 2004年第4期373-377,共5页
A heat pump assisted fluidized bed grain drying experimental system wasdeveloped. Based on this system, a serial of experiments was performed under four kinds of air cycleconditions. According to the experimental anal... A heat pump assisted fluidized bed grain drying experimental system wasdeveloped. Based on this system, a serial of experiments was performed under four kinds of air cycleconditions. According to the experimental analysis, an appropriate drying medium-air cycle for theheat pump assisted fluidized bed drying equipment was decided, which is different from the commonlyused heat pump assisted drying system. The experimental results concerning the drying operationperformance of the new system show that the averaged coefficient of performance (COP) can reach morethan 2.5. The economical evaluation was performed and the power consumption for removing a kilogramwater from grains was about 0.485 kW-h/kg (H_2O), which shows its reasonable commercial efficiencyand great application potentiality in future market. 展开更多
关键词 heat pump fluidized bed grain drying air recycle
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KDD-based rolling schedule model for plate mill 认领 引用
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作者 ZhichunMu DangxianMa +1 位作者 ShaoboWang ChangsongWang 《Journal of University of Science and Technology Beijing》 2005年第3期281-285,共5页
A novel method for generating a rolling schedule is presented, which is fundamentally different from the existing ones. KDD (knowledge discovery in database) techniques are applied for discovering association rules be... A novel method for generating a rolling schedule is presented, which is fundamentally different from the existing ones. KDD (knowledge discovery in database) techniques are applied for discovering association rules between rolling parameters in a large database of rolling operation, and based on these rules, the schedule for the crucial last six finishing passes is generated. Operational evaluation shows that the schedule generated by the new method outperforms that generated by existing methods. It also shows how in this application the human's domain knowledge is applied to speed up the KDD process and to ensure the validity of the knowledge discovered. 展开更多
关键词 KDD rolling schedule modeling plate mill association rules
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Experimental investigation of bioheat transfer characteristics induced by pulsed-laser irradiation 认领 引用
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作者 XiulanHuai JingYang +2 位作者 BaoziSun XiuliZhang DengyingLiu 《Journal of University of Science and Technology Beijing》 2003年第5期64-68,共5页
An experimental study of bioheat transfer characteristics induced bypulsed-laser irradiation was presented. The heat transfer characteristics of bio-materials, and theinfluences of pulse duration, power density, speci... An experimental study of bioheat transfer characteristics induced bypulsed-laser irradiation was presented. The heat transfer characteristics of bio-materials, and theinfluences of pulse duration, power density, species of bio-materials, thickness and initialmoisture content of bio-materials on heat transfer were studied in details. The experimental resultsindicate that the penetration and absorption of laser in bio-materials are considerable, the heattransfer inside the bio-materials should include the effects of volumetric absorption, pulseduration, power density, bio-materials thickness, and material species have a significant influenceon the temperature variation. 展开更多
关键词 pulsed-laser bio-materials heat transfer characteristic temperaturemeasurement
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Dynamic response to road roughness on a tractor-semitrailer system with driver body model 认领 引用
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作者 ShengLing YunqiuHan JiangLiu 《Journal of University of Science and Technology Beijing》 2002年第4期305-310,共6页
A linear mass-spring system model of a tractor-semitrailer together withdriver body parts and sprung seat is presented. Natural frequencies of the system are calculated andresponse of components in the system to road ... A linear mass-spring system model of a tractor-semitrailer together withdriver body parts and sprung seat is presented. Natural frequencies of the system are calculated andresponse of components in the system to road roughness is completed by means of computer simulationand power spectral density (PSD) approach in all of road conditions and loading cases. The resultsshow that the severest situation of response of the system occurs when the road in rough conditionand vehicle unladen. The most sensitive frequency to human body parts is around 0.9 Hz, and modeltypes of a human body seem to be not significant to the response of a heavy tractor-semitrailersystem, including to the response of the driver himself. 展开更多
关键词 tractor-semitrailer dynamic response road roughness computersimulation power spectral density
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Enhancement of heat radiative characteristics of coatings by ultra-attenuation 认领 引用 被引量：2
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作者 DehongXia YonghongWu 《Journal of University of Science and Technology Beijing》 2004年第2期157-160,共4页
The absorption process of radiative heat in its transmission medium and the effect of ultra-attenuation on the radiative characteristics are analyzed in detail. A method of ultra-attenuation to enhance the radiative c... The absorption process of radiative heat in its transmission medium and the effect of ultra-attenuation on the radiative characteristics are analyzed in detail. A method of ultra-attenuation to enhance the radiative characteristics of the medium is proposed. It is proved that decreasing the particle size of coatings can increase the transmission depth of radiative heat and get higher emissivity and absorptivity both theoretically and practically. Ultra-attenuation and nanocrystallization will bring a brilliant prospect to the development of radiative coatings. 展开更多
关键词 radiative heat ultra-attenuation transmission depth emissivity absorptivity
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