Papers by Keyword: Orthogonal Design

Abstract: Vibration of cutting process is an important factor to influence the surface roughness. By Orthogonal design, take hard cutting surface roughness test for bearing steel GCr15 with 62~64HRC, analyzing the law of the variation of cutting parameters effect the amount of vibration and the surface roughness value. And it establishes the formula about vibration and surface roughness. The amount of vibration and the surface roughness increases first and then decreases while the cutting speed increases in a specific area, meanwhile its vibration will reduce and its surface roughness will enlarge while the feed increases. The cutting depth has a little influence to surface roughness and vibration, and the cutting depth is first decreased and then increased accompanied by the tool nose radius increases with the increase of vibration and the surface roughness. The research can provide reference for improving the surface quality.

Abstract: In this study, we designed four components of 6N01 aluminum alloy by orthogonal design, and analyzed the effect of the different elements for the mechanical properties and microstructure of the designed material after casting, homogenization annealing, extrusion treatment and natural aging. Considering the above series of tests of the data indicators, and thus orthogonal filter out two materials that all aspects of performance are more excellent.Keywords: orthogonal design; 6N01 aluminum alloy; mechanical properties; microstructure

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.

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.

Abstract: Because of the dosage of metakaolin and ash fly had a big impact on the performance optimization of inorganic silicon aluminum polymer, using of metakaolin and ash fly can optimize the pore structure and hydration products of inorganic silicon aluminum polymer paste, how to determine the dosage of metakaolin and ash fly of inorganic silicon aluminum polymer reasonably and directly has become a problem in this research needed to be resolved instantly at hand. The current study investigated the relationship between the amounts of metakaolin and fly ash added and the compressive strength of the inorganic silicon aluminum polymer paste, and then established relevant mathematical model using a quadratic regression quadrature combination design. Previous studies have shown that the addition of 13.56% metakaolin and 3% fly ash would be the optimal plan, and that 57.4 MPa would be the maximum value of the compressive strength of the cement paste of inorganic silicon aluminum polymer that could be obtained. Keywords: Inorganic silicon aluminum polymer; Property Optimization; Quadratic Regression and Orthogonal Design

Abstract: Surface roughness plays an important role in product quality, especially for that used in the domain of dental restoration. This paper presents a study on the surface roughness prediction and experimental analysis in grinding the material of zirconia used for dental restoration. For this purpose, the experiment using the orthogonal method is employed. The orthogonal array and range analysis were applied to study the effect of the process parameter had on the surface roughness. A high accuracy machining center, a new dental bur used only for dentistry, and a surface roughness measuring instrument which have excellent properties, are been employed to conducted the experiment. The experimental results demonstrated that the amount of feed, be the major parameter on surface roughness, followed by the width of cut. At the last part of this paper, a model for predict the surface roughness in grinding zirconia is developed based on the experiment by means of linear regression analysis, which can be used to estimate the values of surface roughness given certain grinding parameters.

Abstract: The reliability of the hydraulic cylinder influences the safe working of the mechanical equipment. So, there are very high technical requirements and machining precision for the hydraulic cylinder. The manufacture deviation of the bore diameter will appear in the machining process. It will influence the working performance of the hydraulic cylinder. The paper determines the influence factors of the hydraulic cylinder machining quality and the different factor level, conducts the orthogonal tests of the boring quality of the hydraulic cylinder. According to the range analysis of all test data, the following conclusions can be drawn. The best match of all kinds of factors is A3B2C2D3. The influence of cutting speed on boring the quality of the hydraulic cylinder is the largest. The influences of cutting tool type, the number of boring tool used in boring, and the feed quantity on the quality of boring are minimum.

Abstract: 2,2-Dimethylol propionic acid was synthesized by two steps using sodium hydroxide as the catalyst in this article. The influence of various factors on the yield of 2,2-Dimethylol propionic acid were studied by single factor experiment that included condensation temperature, condensation time, propionaldehyde-formaldehyde ratioetc.. On the basis of this foundation, the orthogonal design was carried out in order to confirm the preferable synthesis conditions of 2,2-Dimethylolpropanoic. The results show that the optimal synthesis conditions are as follows: condensation time is 8 hours, condensation temperature is 35°C, propionaldehyde-formaldehyde ratio is 2.2, sodium hydroxide-formaldehyde ratio is 0.03, the oxidation temperature is 90°C, oxidation time is 6 hours. The product yield can reach to 71.35% under these reaction conditions that is higher than the value reported in references.

Abstract: At present, the productivity benefits of inkjet printing technology with high speed shows a rapid expanding trends, however, the precondition of which is its high quality presswork. Therefore, one of the top priorities now is to find better way to evaluate the presswork quality scientifically and effectively. A new parameter, ink dot fidelity, was introduced as an evaluation criterion to study the presswork quality in this paper. The four evident effect factors that fluctuated more during the printing process were chosen, such as the paper transmission speed, the print head (nozzle) voltage, the ink cartridge pressure and the distance between the print head and paper, to make the scientific orthogonal experiment design. The fluctuation rules of the ink dot fidelity corresponding to each effecting factors were obtained through intuitively analyzing of the orthogonal tables and the effect curves. Based on the experiment, the test data were fitted and optimized by using the mathematical analysis software of MATLAB and the least-square method. And then the mathematical model for ink dot fidelity and these affecting factors were created. Finally, the user interface (GUI) design platform was developed to improve the man-machine communication and the ink dot fidelity, or the presswork quality.

Abstract: A polyimide fiber derived from benzophenone-3,3’,4,4’-tetracarboxylic acid dianhydride (BTDA), toluene diisocyanate (TDI) and 4,4’-methylenebis (phenyl isocyanate) (MDI) has been prepared by wet spinning. The chemical structure of the synthetic polyimide was characterized by Fourier transform infrared (FTIR) spectrometry. Also, field emission scanning electron microscope (FESEM) was used to observe the surface and cross-section morphologies of the resulting fibers. In addition, the obtained fibers possessed good thermal and thermo-oxidative stabilities with the initial degradation temperatures in air and nitrogen 499°C and 527°C, respectively. In order to obtain the optimized processing conditions, orthogonal design was applied. An optimal parameter combination was determined which leaded to maximum of tensile strength . As evidenced by variance analysis, the tensile strength of resultant fibers was influenced by negative draw ratio of spinneret remarkably making it the significant factor.