Papers by Keyword: Orthogonal Design

Abstract: Adopting orthogonal design method in the SFRHSC mix design, only a few experiments would be needed in the study on many influential factors with different level in mix design. The authors studied the SFRHSC mix design of a long-span shell construction as an example, analyzed the influential patterns of SFRHSC workability and strength with different additives. The significance of influential factors were determined by the experiment, and better mix design which meet the design and construction requirements was obtained. The approach to applying mathematic statistics in the mix design of the SFRHSC plays significant role in the material study and engineering practice. The results of experiment study can be reference to other similar projects.

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.

Abstract: An environment-friendly plasticizer, epoxidized corn oil was prepared by the epoxidation of corn oil with peroxyacetic acid which was generated in situ from hydrogen peroxide and glacial acetic using acidic ion exchange resin modified by zinc chloride as catalyst. The product with an epoxy oxygen content of 6.40 w% and a percent conversion to oxirane of 87.67 % was obtained under the following optimized conditions: 15 % modified ion exchange resin feed relative to the weight of corn oil, the molar ratio of 1.7 to 1 with hydrogen peroxide to double bonds, 18% acetic acid feed relative to the weight of corn oil, the reaction time of 5.5 h, the temperature of 75 °C and stirring speed of 600 rpm.

Abstract: Wax emulsion was modified by adding high polymer latex,in order to improve the film-forming ability and sealing ability of wax emulsion,and improve the brittleness of parafilm to prevent it from cracking. By orthogonal design experiment to analysis the dosage of various materials for curing compound,and based on effective water retention and concrete compressive strength ratio the two indicators to determine the optimal mixture ratio of curing compound.

Abstract: In order to select sensitivity parameter of bearing capacity and ductility, the orthogonal design method was used to research reinforced concrete (RC) columns with Z-shaped cross-section under compression and bending, by the nonlinear analysis computer program of RC columns with irregularly-shaped cross-section. The seven parameters and four levels of orthogonal design were researched, for example ratio of limb length to limb thickness, ratio of axial compression, loading angle, concrete strength, long reinforce ratio, stirrup diameter and stirrup spacing. The results indicated that the best sensitivity factor of bearing capacity was ratio of limb length to limb thickness, next were loading angle and long reinforce ratio; the best sensitivity factor of ductility was ratio of axial compression, next were stirrup diameter and stirrup spacing. These would afford references for the design of RC columns with Z-shaped cross-section.

Abstract: During the process of running, running clothing fabrics are in constantly stretching, rubbing and humid environment. However, the previous investigations of the fabric are usually a single performance or the combination of two performance researches. Therefore, this article will consider the athletes body muscles stretch rate, the athlete body sweat and material degree of friction. It was discussed that the stretch and recovery properties of six running fabrics having been tested and evaluated with orthogonal analysis and variance analysis. At last, fabrics in different parts of the body choose according to the optimal use of them. The result will do good to use these fabrics in running clothing development. It will give some references to the development of functional sports products in the future.

Abstract: In order to optimize the ultrasound-assisted corn oil biodiesel transesterification process conditions, factors four through five levels of orthogonal test to optimize their processes, the findings indicate that ultrasound-assisted transesterification of corn oil biodiesel optimum conditions : 1:11 molar ratio of methanol to oil, corn oil catalyst was 11%, the reaction temperature is 90 °C, reaction time was 50min, ultrasonic power 360W, under these conditions, the measured ratio of the average of the transesterification 91.85 %. Relative to conventional preparation methods, the method is simple, rapid, saving solvent consumption and other advantages.

Abstract: To achieve cutting transport with air reverse circulation in dry and shallow large-diameter holes of rock-socketed pile, and to solve the technical problem with airlift and pump reverse circulation, a large-diameter reverse circulation bit innovatively designed based on ejecting. Meanwhile, the orthogonal design method applied to explore the application feasibility of ejector theory in use of in air reverse circulation drilling. Through theory analysis, three key geometry parameters of air reverse circulation bit have proved to have direct affect on the function of cutting transport, including the diameter of nozzles (D_n), the number of nozzles (N), the angle of inclination (θ_s). The results have shown that reverse circulation effect of large-diameter bit designed based on ejecting is valid and stable. Further while the air volume of GQF-16 hammer bit goes to 90m³/min, a configuration of parameters with D_n=20mm, N=3, θ_s=35°are the most ideal parameter combinations.

Abstract: Supersonic Particles Bombarding (SSPB) can introduce severe plastic deformation on the surface of metallic materials, and nanostructured surface layer can be fabricated on the materails. So SSPB is a promosing technology which can be applied in industry. Main parameters of SSPB were optimized by orthogonal design, and their effect on the weight loss of the SSPB treated sample was analysed. Optimized parameters were obtained after the orthogonal experiments.

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.