Papers by Keyword: Parameter Optimization

Abstract: In this paper, we presented a prediction model of oxygen consumption of blast furnace (BF) based on least squares support vector machine (LSSVM) with the production data of an iron and steel factory. This method utilizes data pre-processing and parameters optimization to improve the fitting precision and operation speed of the model. By comparing the prediction results using different models with actual production data, we found out that the modified regression model of LSSVM is more suitable to predict the trend of oxygen consumption than others. The prediction accuracy is satisfactory and is helpful for oxygen system dispatch and production practice.

Abstract: With the development of parts processing technology, the machinery industry has also brought about great development. In this paper, using the computer technology carries out research on the surface machining process physical simulation, through the research on kinetic equation characteristics of surface parts in the cutting process, to establish simulation model. Then, according to the computer system to carry out parameter optimized, it can get the need of parts cutting’s perfect surface equation, speed, cutting time and other parameters. At the same time, through the simulation optimization system design, it can provide parameters basis for precise control of curved surface parts cutting process.

Abstract: Copper is important to the national economy as a kind of raw material, the Copper metal with higher purity is got by electrolysis in generally. In order to ensure the uniform space between cathode and anode when they are in electro-groove, to attain the better quality of cathode copper and raising production efficiency, verticality of the cathode and anode must be well. So it is very necessary to straighten the Copper starting sheet to acquire the better verticality, this paper adopt the roller type straightening machine to straighten the Copper starting sheet by analysis and comparison according to the material and structure characteristic of Copper starting sheet . In order to test the straightening ,this paper will use the ANSYS/LS-DYNA to simulate straightening machine to meet the need of company.

Abstract: Finite element software was used to analyze the deformation of hot extrusion technology at high temperature and high speed for super-alloy Inconel 690(IN690). It had been obtained that the temperature filed and strain filed and stress field during tube extrusion deformation at different speeds and temperatures. The results presented that deformation uniformity being fine and the temperature variety increased with increasing of extruding speed. The maximal equivalent stress decreased and the distributing was further uniformity with the increasing of deformation temperature. Extrusion force reduced at first and then increased with increasing of extruding speed. Maximal extrusion force reduced with the increasing of deformation temperature. The relative errors of extrusion force between simulating results and experiment results are less than 7.3%. Extrusion technology parameters for supper-alloy Inconel690 had been optimized which are that extrusion speed being 110 ~ 120mm / s, and extrusion temperature being 1200 °C.

Abstract: The optimization of second isolation period for parallel base isolation system is investigated systematically. The maximum dissipative energy scale factor is used as the objective function, the maximum sliding displacement of base-isolated layer, the residual displacement and the maximum base shear coefficient are considered as the constraining factors. For first to fourth category site, under the low amplitude severe earthquake, the variation rule of the four seismic response indicators for the second isolation period is approximately same, the second isolation period is proposed to be in the range of 4s to 6s.

Abstract: The screener is widely use in metallurgy, mine, etc. Now the low productivity ratio and low efficiency influence a lot to the working of factories. In this paper, we analyze the motion of object on the screener, and then build the mathematical model to maximize the productivity ratio. Take the example of straight Line vibration screeners with mode ZKB. After maximizing with our method, the result shows that our method increases 21% in the productivity ratio, and the chance of object touching the screen holes increases 45%. This paper provides an effective method for the optimal design of screener in future.The results of this study can also be applied directly to enterprise product design.

Abstract: The transient flowing model of slotted liner completion was established by superposition principle based on the geometric model of slotted liners, with the point source function and the single slotting equal to line source, and then the optimized model of slotted liner completion parameter was established with the skin factor of slotted liners completion as evaluation index. After analyzing the parameter sensitivity with cases, the slot density is confirmed as the main reason leading to flow convergence and additional flow resistance. Furthermore, the optimization principles of slotted liners completion of horizontal well are determined. These results are significant in optimizing the slot distribution pattern and parameter allocation.

Abstract: Circular cooler is deployed for sinter cooling process in sintering industry. According to the sinter cooler from HBIS, an experimental study was conducted and a bench of the heat exchange body was built. Under the same initial temperature of the sinter, the experimental results of nine conditions are compared, which reveals the effect of particle size, material thickness, air flow rate and inlet air temperature on sinter sensible heat extraction, adopting orthogonal experimental method. Experiment results show that, at the mixing condition of material thickness 1400 mm, air flow rate 921 m³•h^-1 and inlet air temperature 90 °C, the unit of sinter available exergy reaches 313.55 kJ•kg^-1. The conclusions provide theoretical and experimental basis for the sensible heat extraction process of the sinter.

Abstract: To improve the joint control of the air-duct cleaning robot, an advanced control strategy of the brushless DC motor has been proposed to substitute the traditional PID control. The novel optimization algorithm based on the improved particle swarm optimization (PSO) is used to modify the normal incomplete derivative PID algorithm and globally optimize its parameters. Simulation results show that the proposed algorithm achieves a well control performance and can effectively satisfy the high accuracy and real-time requirement of the air-duct cleaning robot.

Abstract: In this paper, the parameter optimization problem for face-milling operations is studied. A mathematical model is developed in order to minimize unit machining time. The machining process needs one finishing pass and at least one roughing pass depending on the total depth of cut. Maximum and minimum allowable cutting speeds, feed rates and depths of cut, as well as tool life, surface roughness, cutting force and cutting power consumption are constraints of the model. Optimal values of machining parameters are found by a genetic algorithm (GA). The influence of tool replacement time and GA operators is evaluated.