Abstract: The formulation of bolt axis-stress and deformation according to common transmutation principle in elasticity mechanics is deduced, which is fully considered under the condition of correspond transmutation of bolt, serosity and rock. Simultaneously, the formulation is applied to analyze the results of in-situ experimentation at Jiehe intersection bridge on 104 national road, it certificated that the compute method mentional above is credible in reason and it will be used in other engineering cases.
Abstract: Deflective displacement of a mining pipe under the dragging force of the vessel and the combining effects of winds, waves, and currents were discussed. Mathematical modules of deflective displacement of a ladder pipe with pumps and buffer were built, and the equations were solved by Galerkin method. Simulated by computer, the characteristics of dynamic responses of a mining pipe under various conditions were analyzed.
Abstract: Though many temperature field models of the sinter bed have been created, it is difficult to obtain the analytical or numerical solution of such model. Based on the sinter theory, a temperature field model has been founded. Then the model was simplified and the analytical solutions were obtained for respective four band in the sinter bed. Vertical conduction distance index and horizontal conduction distance index were defined and a common format was formulated based on these solutions.
Abstract: Effect of tundish flux and mould slag on nitrogen absorption of 82B and 35K liquid steel during the continuous casting process has been studied. The results show that nitrogen in liquid steel will be increased when it is exposed at atmosphere, it is not good to prevent absorbing nitrogen when the melt-point of tundish flux is higher than the temperature of liquid steel, and the nitrogen absorption in 35K liquid steel is higher than that in 82B under the same condition.
Abstract: The surface and fringe cracks in thin strips produced by CSP process were studied. The forming mechanism and involved influencing factors were analyzed and then the preventive measures were put forward. The test results show that the main factors causing surface crack on thin strip are the enrichment of impurity elements (Cu,Sn,Sb et al.) in the interface of matrix and iron scale as well as the upper contents of residual elements in steel.
Abstract: The mathematical model of the temperature field for BF wall was established. The influence of diameter of cooling water pipe, distance between cooling water pipes, the distance between cooling water pipe and heat surface of stave, brick conductivity, brick thickness, brick area, lining thickness, thickness of the skull of hot metal and slag and convection coefficient on the the heat load of Blast furnace wall was studied. The results show that decreasing the thermal conductance is the important way for increasing the heat load of bladt furnance wall.
Abstract: The sulfur recovery from the pre-treated anode slime of nickel sulfide electrolysis by vacuum-evaporation. The results show that the vacuum evaporation-condensation method cangain element sulfur (a-sryle), and sulfur content in the slag decrease down by 15.10%, desulfuration ration is 97.08%.
Abstract: Simulated annealing algorithm have been applied to optimize design of wet multiple brakes involving the mixing design variable on the combination of continuous and discrete design variable. Simulated Annealing Algorithm to be improved was applied to optimize design of multi-objective functions on wet multiple brakes, which may obtain satisfactory optimum design result. The optimum design results indicate that simulated annealing algorithm, which is applied to optimize design of wet multiple brakes, is feasible and high effective. This algorithm may be applied to optimize design of engineering structure widely.
Abstract: Cr-Mo steel exposed to hydrogen gas at 400℃, 20MPa for 105 h were checked for making tensile test, fracture and fatigue test in order to investigate the effect of hydrogen attack on mechanical properties of Cr-Mo steel. The results showed that strength, ductility and fracture toughness were lowered caused by hydrogen attack for Cr-Mo steel. The fracture mechanism was changed from dimple fracture surface to embrittlement by hydrogen attack. The propagation rate of fatigue crack of Cr-Mo steel with hydrogen attack was increased caused by hydrogen attack, but threshold values decreased largely with increasing of stress ratio R. The fatigue mechanism was also changed from ductility to embrittlement by hydrogen attack.
Abstract: In the electrodeposited zinc from the sulphate baths containing a small amount Pb2+ ions, the effect of Pb2+ on the texture, the morphology, the lightness, the gloss, the surface roughness, the friction factor and the black tarnish resistance of zinc deposits were investigated. The results show that with an increase in Pb2+ content in the baths, the surface roughness of the deposit was generally increased, but the lightness the gloss, the friction factor and the black tarnish resistance were generally decreased. It is primarily caused by a significant change in crystal orientation of deposited Zn, due to Pb2+ ions added in the baths.
Abstract: The defects in large area diamond films prepared by DC arc plasma jet CVD method are researched. The defects in diamond films are investigated, including the surface, bulk, boundry defects and the macro-cracks and micro-cracks caused by internal stresses. The results show that the growth parameters often led to defects in diamond films.
Abstract: The effects of LiF and CaF2 in the vitreous bond have been studied by the measurement of bonding strength. The results show that, the trend of CaF2 crystallization from Al-Si-O system vitreous bond is more obvious than that of LiF. The melting-point of the bonds is lower and the bonding force is stronger when using LiF than CaF2 as flux. The mole ratio (Al2O3+B2O3)/(R2O+RO+0.5LiF) can be used as a criterion to confirm the self-strength of the vitreous bonds.
Abstract: Special arranged experiments were designed for SEM in-situ observation on inclusion behavior in seeded P/M Rene95 superalloy at tension loading stage. Two different size Al2O3 inclusion's behavior were followed by continuous loading till to fracture. Observed results show that crack can be easily initiated at the interface of larger inclusion and matrix even at the stress level lower than yield. Crack can be also initiated in the inclusion and then propagated to the matrix. Both mechanics show the harmful effect of inclusions in P/M superalloys.
Abstract: In the field of metal forming, a newly special non-confirming large deformation FEM referred to as the Enhanced Assumed Strain Mode (EASM), has been developed to carry out numerical simulation. To make the EASM applicable to analyze the compress deformation problem, the EASM formulation founded by Simo has been modified in terms of reduced factor. Furthermore, this special element has been implemented into a large deformation program EAS.FOR and used to simulate the metal forming process. Two standard illustrations are given to verify the feasibility and validity of the mode.
Abstract: The rectangle thin wall tube of 316 stainless steel and the contortion thin wall tube of 663 copper alloy are fabricated by Laser Rapid Prototyping. The fabricated metal parts are identical with blue print. The as-formed metal parts are fully dense, homogenous and free of defects. Chemical composition analysis show that the chemical composition distribution of metal parts is uniform and the chemical composition of metal parts is same as that of metal powder. The mechamical properties of the metal parts by Laser Rapid Prototyping are equal to that of the materials by conventionally processed method.
Abstract: Effect of sea atmospheric environment and industrial atmospheric on corrosion of metal Zn has been studied for the first time using Quartz Crystal Microbalance(QCM) combined with Infrared Transmissive Spectroscopy(IRTS). QCM results have shown that NaCl deposited on surface of zinc is the most corrosive electrolyte among selected electrolytes to atmospheric corrosion of zinc, (NH4)2SO4 deposited on the surface of zinc is the second, NaNO3 weak, and Na2CO3 the slightest. Combined with the IRTS analysis of the corrosion products, the corrosion mechanism of Zn under thin liquid film has elaborated.
Abstract: A analysis methed to velocity and acceleration for the spacial RSS'R linkage is presented, which name it an influence coefficent method. The method can be used to justify the results obtained from differential method and it can also be used directly for the analysis. While the driven component of the spacial linkage or robot mechanism being controlled, its online controlling velocity can be improved with this method.
Abstract: With the exploration of the adhesive work between fluid and pipe-wall, the drag reduction mechanism for the pope flow of Casson fluid is brought to light. It is belived that wall slip is the nature of drag reduction when fluid flows in pipe flow. Further more, the drag reduction rate in pipe flow is presented, and the relevant factors are also analyzed systematically. Some pratical measure are provided to realizing dragreduction of pipe flow of Casson fluid.
Abstract: The vibration signal of the STEYR diesel engines has analyzed based on wavelet theory, and a feasible means is put forward for the signal denoising, which has been confirmed to be efficiency and accuracy by the experimentation data. The means provides a feasible technique support for fault Diagnoses of STEYR diesel engines.
Abstract: When the architecture and organization of microprocessor is becoming more and more complex, the problem about how to verify the microprocessor function is becoming more and more important. In order to design the functional verification stimulus of microprocessor effectively, a functional verification model of VLIW architectural processor is introduced, based on the organization characteristic, especially the parallel pipeline, in the VLIW microprocessor. Based on the verification model, a verification schema and 100,000 cycle of stimulus for a VLIW microprocessor design have been finished, which includes about 1500 Kbit gates.
Abstract: A new method of coiling tension control is presented. Its key technology is no compensation of traditional dynamic torque, which satisfy no overshoot tension reference and constant tension performance in variable speed process. The method has been applied successfully in high precise produced cold mill.
Abstract: The application of Non-parametric estimation method about optimal resource allocation in power industry was researched. The data of Power Industry in different part of the Country are analyzed transversely with this method, and five indexes are available, they are: pure technique-efficiency, size-efficiency, the input disposition-degree, the input component-efficiency and the input combination-efficiency. The results of the analysis can prove that the difference of resource allocation-efficiency in different Power companies is high and the input combination-efficiency of Power Industry is low as a whole.
Abstract: The FGC (flying gage change) process on an actual 5-stand tandem cold mill by simulation was researched. First, its FGC simulation system was given and its technology to realize FGC was analyzed. Then a simulation was done on an actual 5-stand tandem cold mill. By detailed analyzing the results, It indicated the deficiency of current technology and advanced a measure to improve the mill's dynamic characteristics. Simulation results confirmed its effectiveness and feasibility.
Abstract: Fuzzy controller with integral is developed, and is realized by Siemens S7-200 PLC. This controller is applied in the reverse osmosis water-treatment equipment to control the conductivity real-time. This method raises the working efficiency of the equipment and the utilization ratio of water in reverse osmosis process.
Abstract: Different from the traditional serial design process, more downstream development phases are considered in concurrent design. This increases the possibility of conflict and makes conflict detection one of the most important issues in concurrent design. The consistency algorithm of conflict detection based on constraint networks is studied. Made use of Petri net, conflict detection model is built and analyzed. An engineering case is provided to prove the feasibility of the algorithm.
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
