Papers by Keyword: Orthogonal Design

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Authors: Dong Hong Tang, Fang Lu
Abstract: Based on the geometry of the cutter, the dynamic force model of face milling was established. Meanwhile, the fast and effective identification method of milling force model coefficients was provided, which combining the virtues of both orthogonal design theory and partial least-square regression (PLSR) method. Milling experiments have been conducted to verify the proposed face milling force model. Good agreements between the experimental and simulated results were presented.
Authors: Yi Tao Zhao, Yu Qin Tang, Ke Zhen Liu, Yu Zhang
Abstract: Polysaccharides are main bioactive compounds of Fomitopsis ulmaria (Sor. : For.) Bond. et Sing (F. ulmaria). In this study, microwave-assisted extraction (MAE) method was employed for the extraction of polysaccharides form F. ulmaria (PFU). The important extraction parameters that influenced the extraction yield of PFU were optimized by employing an orthogonal design, including solvent/material ratio, microwave power, and extraction time. The results showed that the optimum extraction conditions were as followings: solvent/material ratio of 40:1 ml/g, microwave power of 400 W, and extraction time of 2.5 min. Under optimized conditions, the extraction yield of PFU was 8.36%. This work is expected to provide a scientific reference for the further research and industrial production of F. ulmaria.
Authors: Dong Zhang, Ying Zhang, Ya Fei Hu, Yang Liu
Abstract: This paper explained the basic principles of single factor experiment and orthogonal design which were used to change the component of fluorescent powder and improve latent fingerprint appearing effect on object surface. Besides, the author also commented on the characteristics of optimized formulation.
Authors: Fu Qing Yuan, Zhen Quan Li
Abstract: According to the geological parameters of Shengli Oilfield, sweep efficiency of chemical flooding was analyzed according to injection volume, injection-production parameters of polymer flooding or surfactant-polymer compound flooding. The orthogonal design method was employed to select the important factors influencing on expanding sweep efficiency by chemical flooding. Numerical simulation method was utilized to analyze oil recovery and sweep efficiency of different flooding methods, such as water flooding, polymer flooding and surfactant-polymer compound flooding. Finally, two easy calculation models were established to calculate the expanding degree of sweep efficiency by polymer flooding or SP compound flooding than water flooding. The models were presented as the relationships between geological parameters, such as effective thickness, oil viscosity, porosity and permeability, and fluid parameters, such as polymer-solution viscosity and oil-water interfacial tension. The precision of the two models was high enough to predict sweep efficiency of polymer flooding or SP compound flooding.
Authors: Xue Wei Huang, Sun Ing Bao, Jing Wang
Abstract: During the process of rapid prototyping based on robotic pulse MAG forming, the coefficient of weld reinforcement is crucial to the geometric accuracy and mechanical property of metallic parts. The orthogonal design method, as well as the range analysis and variance analysis, were applied in this article to study the effects of wire feed rate, welding speed, pulse correction and arc length correction on coefficient of weld reinforcement, finding out the factors which were significant to the coefficient of weld reinforcement and optimizing the process parameters. The experimental results show that the order of the significance of parameters is as following: the welding speed, the arc length correction, the wire feed rate, and the pulse correction. Among them, the welding speed and arc length correction have the greatest influence on the coefficient of weld reinforcement, as is 0.025. The optimal process parameters are: arc length correction 8%, welding speed 14mm/s, wire feed rate 7.2m/min and pulse correction 0. At the same time, the coefficient of weld reinforcement is between 2.94 and 3.00, as the degree of confidence is 97.5%.
Authors: Jiang Wen Liu, Yong Zhong Wu
Abstract: In wire electro-discharge machining with an extremely high travelling speed of wire electrode (WEDM-HS), the emulsion is used as working liquid. Because there exists a functional electrolyte, the EDM spark can operate under a relatively large spark gap size condition, and this would facilitate the removal of machined debris. An investigation has been made into the machining feasibility when WEDM-HS has been employed to process Al2O3 particle reinforced aluminum alloy 6061 with 10-vol% Al2O3 (10ALO). And the material removal rate (MRR) has been examined in this study. Since there are many factors that can influence the MRR in the WEDM-HS process, in order to determine which is the most important factor and to optimize the machining parameters, the relative importance of the various machining parameters on material removal rate was established by utilizing an orthogonal experimental analysis. The results of the analysis suggest that to achieve a high MRR for particulate reinforced aluminum 6061 with 10-vol% Al2O3, the duty cycle is the most influential factor among current, pulse duration and duty cycle. And the impact of the different factors follows the sequence of duty cycle > current > pulse duration.
Authors: Jian Wei Gu, Mei Wu
Abstract: There are lots of factors effect on weak gel flooding.This paper based on the conceptual model by changing the model parameters and using orthogonal design to analyze the effects of different factors on weak gel flooding. The descending order of influence is slug size, flooding time, oil-water viscosity ratio, permeability range, concentration of polymer, slug combination and polymer-cross linker ratio.
Authors: Gen Chuan Luo, Zhong Ming He, Xin Tong Zhao
Abstract: By analysis its own characteristics of Reconstruction and Extension freeway slope, summary and presents the main factors affecting slope stability; then use orthogonal test method, analysis the result by Range Method, it indicated that the sensibility of impact factors on the Stability of Reconstruction and Extension Freeway Slope was in the following order: the slope angle after excavation, cohesion, weight of soil layer, internal friction angle, the slope angle before excavation, Cable length, Cable spacing.
Authors: Wei Liang Gao, Yun Peng Li
Abstract: The stability study is one of the hot spots of the urban transport design for the subway through the existing structure. The maximum settlement of the structure is regarded as the index of underneath the subway construction and design in this article, the mechanical parameters for pipe shed reinforcement layer on a subway station passing through the existing structure is back analyzed by utilizing the orthogonal experiment design methods, and the mechanical integration properties parameters which is close to engineering practice including elastic modulus, Poisson ratio, cohesion and internal friction angle for the material in the pipe shed reinforcement area are got. The steel pipe reasonable spacing range of advanced pipe shed support is got mainly on the basis of flexural rigidity. The stability analysis and evaluation for the construction of the new subway through the existing subway structure are carried out by utilizing the obtained optimum parameters.
Authors: Guo Feng Wang, Wen Zhao, Yong Ping Guan, Shen Gang Li
Abstract: The selection of material parameters relates to the excavation stability of the underground caverns. However, back analysis is an efficient method to evaluate mechanical parameters. Given the defects of BP neural network, such as low capability of generalization and long training time, by using GA, which have global optimization ability to optimize the BP neural network weights. The parameter of surrounding rock was designed by uniform and orthogonal method, not only reduced the iterative time also improved the accuracy of the prediction. The proposed method is further illustrated with its application to the underground cavern of Lvchunba railway tunnel. Based on the surrounding rock’s parameters obtained by back analysis, the displacement of the surrounding rock was predicted. The results showed that the error between numerical calculation value and actual monitoring value was 13.2%,-8.3%,-8.9%,9.4% respectively.
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