Papers by Keyword: Range Analysis

Abstract: At present, adding solid waste in plant substrate to replace part of planting soil has become a new direction in the field of ecological slope protection substrate research. In this paper, 16 groups of indoor orthogonal experiments were carried out with fly ash and sludge as the components of vegetation substrate and tall fescue as the planting object to explore the influence of ecological slope protection substrate on vegetation growth. Based on the range analysis method, the three functions of substrate planting performance, mechanical properties and substrate properties were used as references, and the entropy weight method (EWM) was used to assign weights to the proportion of each index in the total score, and the ratio was optimized. The results show that the optimal substrate ratio is 10% sludge content, 30% fly ash, 4% cement, 6% fiber, 50% planting soil (the ratio of loess and peat soil is 1:3). Fly ash has a great influence on the height of plants and vegetation coverage, and has a significant effect on the internal friction angle and fertility of the substrate. Sludge mainly affects the growth height of plants and the pH value and fertility of the substrate. The importance of factors affecting the growth of plants from large to small is: fly ash, the ratio of loess and peat soil, sludge, rice husk, cement.

Abstract: Fused Deposition Modeling (FDM) is an Additive Manufacturing technology where a heated plastic filament will be placed on the bedplate layer by layer until the 3D object is printed. The mechanical properties of the ABS FDM 3D-printed parts are not yet determined or estimated prior printing. Hence, the goal of this study is to identify the optimum 3D printing parameters based on the tensile properties of ABS FDM 3D-printed polymer parts. Taguchi approach and Range Analysis were used in finding the optimum 3D printing parameters in which different parameters were considered to meet the requirements of the orthogonal arrays. Five pieces of 3D-printed dumbbell-shaped tensile specimen were prepared for each parameter. The tests followed the ASTM D638-14 standard. The result for the optimum 3D printing configuration of ABS FDM 3D-printed material were concluded as the values with the highest tensile strength.

Abstract: Abrasive waterjet machining is considered as a promising technique in hard-brittle material polishing. In this paper, The ultrasonic torsional vibration is considered to apply on the workpiece to improve the abrasive waterjet polishing quality and efficiency. The process parameters in the ultrasonic torsional vibration-assisted abrasive waterjet polishing are optimized. The ultrasonic torsional vibration in the role of the abrasive waterjet polishing is investigated. The results show that the application of ultrasonic torsional vibration can effect of abrasive particle movement and increase the critical depth of the ceramic materials.

Abstract: In the deep and ultra deep well casing wear is serious. The decrease of strength leads to casing damage, affects the follow-up well test and completion. In order to analyze the influence of the contact force, rotating speed, steel grade and muds on casing wear, determine the optimized level collocation scheme which makes casing wear minimum, optimize drilling parameters and casing programs, reduce casing wear, four factors and three levels orthogonal experiment of casing wear was carried out, and the range analysis of the experiment results is made. The results show that the best match of factors is A1B1C1D3, namely when the contact force is 200 N(A1), rotating speed 60 r/min (B1), steel grade N80(C1), oil-based mud (D3) casing wear is minimal. The influence of muds on casing wear is the largest, the next is casing steel grade, and then rotating speed, the effect of the contact force minimal. The improvement of mud performance is best method to reduce casing wear.

Abstract: Combined with the heat-resistant concrete needed for a company combustor, based on the availability of local raw materials, the orthogonal test was used, then by the variance analysis and range analysis, the components of the heat-resistant concrete which could meet the technical requirements of the project were selected. Engineering application results showed: the components of the concrete could meet technical indicators for the engineering application, and effectively reduced the cost of production of heat-resistant concrete.

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: The technological parameters on synthesis rate of ITO nanometer by chemical coprecipitation were investigated. The effects of process parameters on synthesis rate of ITO nanometer powders were discussed by the range analysis of orthogonal experiment design. The dispersion features of ITO nanometer powder by ultrasonic dispersion or without were compared. The results show that the biggest factor that affects the powder synthesis rate is the pH at the titration end-point. Powder synthesis rate increases with the increase of pH value. When pH is 9, the powder synthesis rates are all above 90%. TEM images show that ITO nanometer powders are well dispersed without obviously agglomeration when anhydrous ethanol is used as dispersant. Particles have diversity of shapes, and the particle sizes distribute widely. After Ultrasonic physical dispersion, ITO nanopowders are well dispersed with no obviously agglomeration, narrow particle sizes of 20-30 nm and the approximation spherical particle morphology.

Abstract: In order to research the effect of splitter blades main geometry factors on the performance of pump as turbine, the L₉(3₄)orthogonal design scheme has been developed based on four factors which contain the blades circumferential biasing degrees, the outlet deflection angle, the outlet diameter and the number of blade. According to this design scheme, numerical simulation of centrifugal pump (ns48) as turbine has been done. By range analysis of computational results, the best design scheme of splitter blades and the level of each factor for the primary and secondary order of turbine efficiency (the outlet deflection angle, the outlet diameter, the number of blade, and blades circumferentially biasing degrees) are obtained. The internal characteristics analysis was done on centrifugal pump (ns48) as turbine at its optimal operating conditions. The results shows, compared with conventional impeller, that the internal velocity and pressure field distribution using the design scheme of composite impeller is more reasonable.

Abstract: In this paper, through the domestic and foreign research experience, the orthogonal experiment on some factors affecting the durability of concrete is designed. By range analysis the tests identify the effects of various factors on frost resistance, therefore this paper presents the optimum mixture ratio.

Abstract: The Runout Distance is One of the most Important Factors of Landslide Hazard. it Not only Controls the Hazard Area but also Influences on the Landslide Hazard Assessment. Based on the Data of Landslides Induced by the Wenchuan Earthquake, the Six Slope Structures, Including Rock and Soil Mass, Slope Type, Gradient (α), Slope Height ( h), Azimuth Difference between Slope-Aspect and Strata Trend(θ1), Difference between Slope Gradient and Obliquity of Rock Layer (θ2), and Seismic Intensity were Selected to Evaluate the Landslide Runout Distances. the Evaluation Model of Landslide Runout Distance was Proposed by the Combination of Fuzzy Mathematics and Range Analysis. the Results Indicated that it was Different that the Slope Structures Influenced on the Runout Distance in the Different Volume Scale. According to the Evaluation Model, the Typical Landslide Runout Distances were Studied, and the Evaluation Results Accord with the Actual Runout Distances.