Abstract: The research concentrates mainly on the structure and function of simulative experiment sys-tem and its appliction. The crack development of failure process in composite rock-mass material and statis-tical regularity including the stress,displacement,time and space each other through mining simulative experi-ment can be inferred from the process inspection in-formation. It is a vitally fundamental research to analyze the strata control due to the muti-coal seams mining under the complicated rock mountain and building.
Abstract: Based on the other reseachers' work, the Gumbel Ⅰ distribution of mining tremors' extreme magnitude is derivated.The determination method of the distribution parameters is also developed. After bri-efly introducing the tectonic structure and physical background of mining tremors in Laohutai coal mine, the magnitade extreme distribution is applied to the practice of probabilistic prediction of monthly largest magni-tudes at the Laohutai coal mine.The result shows that the predicted probability distribution of monthly largest magnitudes consists well with the distribution of practical record of monthly largest magnitudes.
Abstract: Applying the theory and method of system engineering, the dynanic relation models about mine benefit object and main technical indexes, including industrial indexes of ore deposit, reserves average grade,loss rate dilution rate and beneficiation feed grade, have been built. Based on these models, the multi-object decision technique has been used to optinzed these indexes dynamically. Asignificant economic benefit has been gotten by using the research result, for example, a added profit of 10 million RMB per year was gotten in Waitoushan Iron Mine and Meishan Iron Mine.
Abstract: Based on double longwall mining on confined aquifer in Yangzhuang colliery, the stress dis-tribution and fracture characteristics in floor strata are investigated by means of in-situ measurement, physical modeling and numerical analysis. The influence of different mining parameters on the mechanical behavior of floor strata is recognized. The rational technical parameters and engineering measures are proposed through the study for safe mining on confined aquifer.
Abstract: An experimental system of blast model of three-dimension dynamic astigmatic photo-elasticity is established by using the ruby pulse laser apparatus. By detonated the column and trip-shaped charge at one side, two sidesor or in the mid-point, four dynamic stress fringe patterns of the same section at four different second are got, then the dynamic stress field of three kind of blast model is constrasted and analyzed. Finally the corresponding conclusions of blast effect are got.
Abstract: For a long time, the estimation to iron ore has been concentrated on its chemical composition, size distribution, mineral characteristics under normal temperature by researchers, while the research to the physical chemistry reacting characteristics of iron ore under high temperature was very little. On the basic of experiment and think deeply, the concept of iron ore basic sintering characteristics have been introduced, the concept included assimilation, fluidity of liquid phase, self-intensity of adhere phase, and creating ability of SFCA and so on.Study on the iron ore physical chemistry characteristics under high temperature will be very important to complete sintering basic theory, improve sinter quality, optimize sintering technology process.
Abstract: For a long time, the estimation to iron ore has been concentrated on its chemical composition, size distribution, mineral characteristics under normal temperature by researchers, while the research to the physical chemistry reacting characteristics of iron ore under high temperature was very little. On the basic of experiment and think deeply, the concept of iron ore basic sintering characteristics have been introduced, the concept included assimilation, fluidity of liquid phase, self-intensity of adhere phase, and creating ability of SFCA and so on.Study on the iron ore physical chemistry characteristics under high temperature will be very important to complete sintering basic theory, improve sinter quality, optimize sintering technology process.
Abstract: Based on the Similarity criteria, series water modeling experiments have been carry out to investigate the fluid flow in the mould of thin slab continuous caster by 1:1 ratio water-modeling simulation systems. SG800 hydraulic test data sampling system is applied to investigate the wave amplitude and impe-tus. In order to satisfy the demand of thin slab caster at high speed, a new structure SEN (Submerged Entry Nozzle)-Dissipation SEN have been invented. The effects of dissipation nozzle's structure, outlets' ratio of area, outlet angle and casting speed on fluid flow in the mould have been investigated. The experimental re-sults proved that the dissipation SEN could satify the need of fluid flow condition in the mould at high speed.
Abstract: With the convertor sludge as raw material and with mixed binding of organic and inorganic binding agent, high quality sludge pellet was prepared by crumby pressing and low temperature calcination. The factors that affect the strength of the pellet were examined. Experimental results show that the strength of pellet increased as the calcination temperature increased and it got its peak value while calcination temperature was about 873 K, While temperature was increased to higher than 873 K, with the volatilization of crystalline water and organic binding agent, the pellet strength decreased. However, as temperature increased further, es-pecially as temperature exceeded 1300K, with the effects of liquid sinter and solid diffusion, the pellet strength increased again. Pattern recognition has been carried out to analyze the parameters affect pellet strength, and optimization region of sludge pellet has been classified. The proper process parameters of sludge pellet have been determined.
Abstract: Powder injection desulphurization and denitrification refining process with the ladle-cover was studied. The experimental results showed that in first stage, desulphurization ratio reached the 50% and denitrification ratio reached the 30%. In second stage, desulphurization ratio reached the 65% and denitrific-ation ratio reached the 40%. The process reduced sulphur of molten steel to 4×10-6 and nitrogen of molten steel to 12×10-6. On the some time reduced the nitrogen. The experiment result supplied basic theory for the commerical test of the process.
Abstract: Precipitation and nucleation of TiN during solidification of clean steel have been studied. And the possibility of using TIN to refine as-cast grains as heterogeneous nucleation sites as well as to reduce mac-rosegregation in continuous casting of steel is discussed. The conditions that TiN precipitates at the beginning of solidification have been acquired and the effectiveness of this TiN refining as-cast structure process has been investigated with comparative experimental methods. It is shown that refining grains by inoculating clean steel with TiN is an effective way provided that the process is controlled strictly.
Abstract: Based on deeply-analyzing the characteristics of iron-making process, it is presented that gen-eralization and self-adaptation of the BF judgement systems are two important factors for maintaining the sta-bility and efficiency of neural network expert system. The strategy for improving these two features has been proposed and a new developed system has been proved to be satisfactory in the on-site blast furnace operation.
Abstract: Flow stress curves of stainless 0Cr13 were experimentally studied with a cam plastometer at a constant deformed speed. The effects of the deformed temperature, deformed rate and deformed degree on flow stress were analyzed. At the same time, two non-linear regression mathematical models were proposed. The discrete temperature model fit accurately with the experimental data, and the entire temperature model is useful in the computer control of on-line process.
Abstract: Because of the drawbacks of the traditional tangent measurement method, a new non-tangent method with the use of digital image processing technology which provides a real time, fast, validity way is presented. It is contains several approaches: image pre-processing, image binaryzation, image segmentation, figure line taking, fitting and smoothing, system calibrating, size calculating etc. A completed system is im-plemented based on this algorithm and shows its feasibility and validity in actual usage.
Abstract: The strip quality including gauge and shape was improved greatly. A new method based on using PI controller to control strip wedge was presented. The simulation results showed that the strip wedge precise was improved effectively.
Abstract: Tthe two difference flatness control technologies, CVC4 and DSR can be implemented by tur-ns. Based on experiences of flatness qualities from industry production, and flatness control performances from numerical simulation about the two actuators, CVC4 and DSR are comprehensively evaluated and contrasted.
Abstract: The deferent features are analyzed based on chaotic time series and stochastic series. A jud-gment algorithm has been put forward to distinguish the features of both chaotic time series and stochasitic series. A wavelet neural network is structured combining wavelet function and neural network. Finally an in-tegrated algorithm ofjudgment and prediction of chaotic time series has been published.
Abstract: To the characteristic of the tool of cross wedge rolling, the modeling method and structure about information model of CAD/CAPP integration for the tool of cross wedge rolling based on feature were presen-ted. And with this information model a typical and symmetrical tool of cross wedge rolling was analyzed and instantiated. The results indicated that the basic compositive structure of tool was reflected in this information model of feature, as well as the machining technical information for tool of cross wedge rolling was described integrality.
Abstract: A method of improving flatness object curve for nontropism silicon steel rolling is proposed. The actual strip transverse temperature distribution can be accurately described with a biquadratic mulnormal. The add-stress compensation is calculated and the preseting precision of flatness object curve is improved.
Abstract: The hot grind schedule of work roll in hot strip mills includes the cooling time waiting for grinding after rolling and corresponding compensatory contour. On the basis of analysis of varying rules of work roll thermal field and thermal contour during rolling and after rolling, the hot grind schedule is establish-ed. The optimum cooling time of work roll after rolling is about two hours and its compensatory contour varies with the latency time after grinding.
Abstract: Cross wedge rolling is a complicate 3-D elastoplastic forming process. A nonlinear finite element modeling for the process of cross wedge rolling is presented with the aid of ANSYS/LS-DYNA3D. The deformation character and the distribution of stress and strain on section of workpiece during stretching stage have been obtained. On the hasis of the deformation character and the distribution of stress and strain,the shoulder and cavity on the end of work piece have been analyzed.
Abstract: Employing Simulated Annealing Algorithm(SAA) and Finite Difference Method, a calcula-tion model of work roll thermal contour was built in a 2800mm 4-high mill of Wuhan Iron and Steel (Group) Co.. The model was a semi-theory practical formula. Its pattern and magnitude were still hardly defined with classical optimization methods. But the problem could be resolved by SAA. It was pretty high precision to predict the values of work roll thermal crown in a rolling unit. After one year application, the results show that the model is feasible in engineering, and it could be applied LO predict the roll thermal contour of other mills.
Abstract: Considering the effect of temperature on rolling parameter, the ANSYS software was used to calculate the rolling parameter in the producing process of 2800mm heavy-late machine, the stress distribution within the deforming body, the stress distribution on the contact surface and rolling force. The model of rol-ling force was built on the basis of these parameter. At last,the parameters are improved in rolling process. The calculated results are close to the measured ones.
Abstract: Through the study of the process of skew rolling step-axis with the help of FEM software ANSYS-DYNA, the stress on the middle section of the workpiece and the infection of ridge slope to the stress in the center is known. The result indicates the principal stress and Von-Miss stress have great influence on the middle section of the workpiece, the state of stress and the accumulation of the stress are the main reason of the failure.
Abstract: The actual contours and wear condition of work roll and backup roll in single-stand temper mill were investigated. The effects of roll contours on strip profile were analyzed by a finite element model for computation of the roll gap profile with its quadratic and quartic components. The results show that the work roll wear is slight but the original roll contour is liable to result in quarter buckle sheet defect; non-uniform wear of backup roll is serious but has little effect on strip profile.
Abstract: An on-line surface defect inspection system for cold rolled strips is introduced. The system is equipped with CCD matrix cameras to capture images of steel surface simultaneously. A parallel computer system is used for image processing to obtain defect information on steel surface. The system is specialized in software designing for real-time data processing. With samples from industry, the system is tested that six types of surface defects of cold rolled strips can be detected and classified with high rate, including ‘emulsion marks’, ‘rusts’, ‘scales’, ‘roll imprints’, ‘coil breaks’ and ‘edge cracks’.The recognition rate of the system for these six kinds of defects is more than 90%.
Abstract: Due to the disadvantage of separating the strip elastoplasticity and rolls elastic deformation calculation, a new methods was developed to combine these two models by rolling force distribution coeffi-cient to solve the coupling problem between two models. It can improve calculation precision at the same time of ensuring calculation efficiency. It is suitable for vast calculation and can meet the requirement of engineer-ing research.
Abstract: Properties of rare earth are very important for the developing of the rare earth technology. A database of properties of the rare earth and their compounds is constructed on WWW. This system supplies a convenient and fast way for looking up data of properties about rare earth and their compounds.
Abstract: A new way was presented to optimize the scheduling of finisher of hot continuous rolling mills by means of Immune Genetic Algorithm. The method has advantages such as fast searching speed, high com-puting precision, suiting to on-line calculation. Test results show that the new method is valid. This method also provides another way for optimal design of the schedule of finisher of hot continuous mills.
Abstract: Based on the study of statistic property of Logistic map,the nested intervals chaos search is proposed to avoid the blindness of chaos search.By combining the nested intervals chaos search with conjugate gradient approach,a hybrid optimization algorithm is given.The hybrid algorithm uses the nested intervals cha-os search to find the approximal point of the global minimum and uses conjugate gradient approach to find the global minimum.The simulation shows that the proposed hybrid optimization algorithm can significantly im-prove the computational efficiency of global optimization.
Abstract: The inner mechanisms that were put forward solely by the author Yang Bingru are introduced: cooperation mechanism of double bases, fusion mechanism of double basis and diffusion mechanism of information. Then expansibility structural model of KDD are described: KDD*, KDK*, KD(D&K) and ESKD. And some innovational productions are introduced such as a new method of knowledge representation, mining algorithm, automatic evaluation algorithm.
Abstract: A new type of chaos generator, digital-flow chaos generator is proposed. The strange attractor like ‘helmet’ in Logistic mapping digital-flow chaos generator is found by simulation. The section characteris-tic of Logistic mapping in theory is deduced. And infinitude of immovable points in Logistic mapping chaos section during μ∈(3.57l448,...,4) is found. The basis of chosen parameter for chaotic secure communication is provided.
Abstract: Artificial Life is a new subject that developed very quickly. The concepts and contents of Arti-ficial Life are introduced,the two research ways include bioscience ways and engineering ways are given.The research of Artificial Life can help to reveal the intrinsically characteristic of life. It has great science signifi-cance and application values.
Abstract: The principle of designing involute roller-path is presented. The fundamental problem, which must be resolved in accomplishing the graphic programming of designing involute roller-path, is discussed. Under Windows, using Microsoft Visual C++ programming language, the automatic designing involute roller-path in the graphic programming system of NC spinning machine is materialized.
Abstract: In Simple Genetic Algorithms(SGA), chromosomes are produced at random. In order to increase the popularity and diversity of individuals, a new genetic algorithms which produces chromosomes with grid is proposed, and its optimization efficiency is evaluated quantitatively. For comparision with SGA, the DeJong Function Flis used an example.Both results show that the new genetic algorithms with grid is valid for improving the optimal efficiency of genetic algorithms.
Abstract: MDM(Minimum Distance Method) is a very familiar algorithm in state recognition. But it has a presupposition, that is, the distance within one class is short and the distance between classes is long. When this presupposition is not satisfied, a mistake is made. In order to overcome the shortcomings of MDM, an im-proved minimum distance method based on ANN(Artificial Neural Networks) is presented. The simulation re-sults demonstrate that this method has two advantages, that is, the rate of recognition is fast and the accuracy of recognition is high.
Abstract: In the volume calculation of stockpile by using computer-aided measuring technique, a new volume calculation method is introduced. It includes six steps which are purifying and standardizing raw data, getting partial derivative of data points, building triangle grid, surface fitting of triangle region, cal-culation triangle region volume, calculation volume of stockpile. Based on this algorithm, an application system is developed, and it is testified valid and practical by analyzing instances.
Abstract: A Cellular Nonlinear Network (CNN) model of the growth of tumor and immune surveillance against caner(GLSAC) is proposed. Using the analytical criteria for CNN with four state variables and three ports studies the bifurcation diagrams. Numerical simulations exhibit the processes of diffusing and clearing of cancer cells in organs and complex behaviors of the SISAC CNNs. It seems that the existences of immune surveillance defects in organs may arise the transfering and diffusing of canner cells.
Abstract: The nonlinear mathematical model is given to describe void nucleation and growth for elastic solid materials. Exact formulae to calculate the critical values of control parameters for cavitation and exact expressions for growth of void radial are derived. For large deformation, finite logarithmic strain measure is used, and the constitutive relationship of materials is basic on Hookean elastic law. The numerical results show that the critical loads of cavitation for Hooke elastic solid in the case of uncompressible materials are slightly lower than the critical loads for uncompressible neo-Hookean hyperelastic materials. The cavity will be suddenly ra-pid growth after void nucleation. This conclusion is agreed with the corresponding conclusion from the damage micromechanics and the theory of cavitated bifurcation for hyperelastic materials. Also, the analysis shows that the loop stress will become infinite when void nucleation. Thus, the materials near the cavity will product plastic deformation if the materials are elastic-plastic. This leads to local failure and fracture of the materials.
Abstract: The Ni-Ga system was assessed using the CALPHAD technique. The thermodynamic behav-iour of the ordered phases (Li2-Ni3Ga and H2-NiGa) were described by the sub-lattice model, and the order-disorder transformation of fcc-(Ni) and Li2-Ni3Ga phase was considered in the assessment. The solution phases (liquid, fcc-Ni) were modeled with the Redlich-Kister equation. The other 5 intermetallic compounds were treated as stoichiometric phases.
Monthly, started in 1955 Supervising institution：Ministry of Education Sponsoring Institution：University of Science and Technology Beijing Editorial office：Editorial Department of Chinese Journal of Engineering Publisher：Science Press Chairperson：Ren-shu Yang Editor-in-Chief：Ai-xiang Wu ISSN 2095-9389CN 2095-9389
