Papers by Keyword: Orthogonal Experiment Design

Abstract: Interlayer is one of the major factors which results in the heterogeneity of reservoir, and it is the important content of reservoir fine characterization. In this paper, taking WZ oilfield as an example, the object-based simulation method is used to characterize the spatial distribution regularity of calcareous intercalation and sand-stone, design the experiment scheme through the orthogonal experiment design method and analysis the factors that influence the distribution of interlayer. Results showed that the object-based simulation method can characterize the shape of calcareous intercalation very well, and the orthogonal experiment design can distinguish the influence of various factors.

Abstract: The parameters of the On-off shift solenoid valve are analyzed by finite element analysis software Ansoft and orthogonal experiment design. What’s more, the design parameters of the on-off shift solenoid valve can be optimized by analysis of the data of the orthogonal table. The result shows that the voltage influences the electromagnetic force the most, the air gap comes second and the number of turns is the minimum. We find that the force increases with the growth of voltage and the number of turns, but it is opposite to the air gap.

Abstract: In this paper, the moulding conditions of urea-formaldehyde resin were optimized to prepare moulding plastic with good mechanical properties using orthogonal experimental design method. The effects of moulding temperature, pressure and pressing time on the impact strength and blending strength of urea-formaldehyde resin were studied and analyzed. The results showed that moulding temperature had most noticeable influence on the impact strength and blending strength of urea-formaldehyde moulding compounds. The ratio F of moulding temperature to the impact strength was 2.077; the ratio F of moulding temperature to blending strength was 1.082. The most optimum conditions of preparing samples for testing the impact strength were that moulding temperature was 155 °C, pressure was 30 MPa and pressing time was 12 min; and the optimum moulding temperature of preparing samples with high blending strength was 155 °C, pressure was 25 MPa and pressing time was 5 min.

Abstract: The selection of welding parameter has an important effect on weld quality. In this paper, an orthogonal experiment method was used to optimize the resistance microwelding (RMW) parameters for the connection of insulated copper wire and phosphor bronze sheet. An orthogonal array with three factors (welding current, weld time and electrode force) and five levels was used. Joint breaking force (JBF) and surface appearance were selected as the evaluation criterion of the weld quality. The results show that welding current was the most influencing parameter on joint strength, while the electrode force had the most significant effect on the surface appearance. The orthogonal method was proved to be an effective method to obtain the optimum conditions for RMW of insulated copper wire.

Abstract: To decrease the influent load of the wastewater treatment system and increase the overall ability of the wastewater treatment plant to meet the demand for 15% production expansion of the enzyme preparations factory, the purpose of this study was set to decrease COD concentration of the centrate from the sludge treatment system. Three orthogonal experiments and follow-up analysis of experiment results identified the significant impacts factors on COD concentration of the centrate. Afterwards, four full factorial experiments were designed to obtain a set of optimum parameters combination on the condition that no GMO was detected in the dewatered sludge.

Abstract: The Ni-coated TiH₂ composite powder was prepared by electroless plating and the concentration of reducing agent, reaction temperature, reaction time, PH value and so on were optimized by orthogonal experiment design. The Ni/TiH₂ composite powder morphology and composition was analyzed by scanning electron microscopy (SEM), Energy Dispersive spectroscopy (EDS), X-ray diffraction (XRD); the plated Ni layer growth mechanism was explored preliminary. The Optimization technical parameters: the plating temperature was 85, the pH value was 10 and the hydrazine concentration was 100ml/L. Complete coating and uniform thickness of the Ni layer with average coating thickness about 2.0μm was successfully prepared with the optimization technical parameters. The growth mechanism of the coating followed the Ostwald ripening mechanism. Compared the TiH₂ uncoated with Ni layers particles, the TiH₂ composite powder could efficiently delay the starting time of gas release by approximately 80s.

Abstract: Investigation on the heat transfer and friction characters for fresh oil flowing inside three-dimensional internally finned tube (3-DIFT) was carried out with orthogonal experimental design method. Reynolds numbers varied from 30 to 800，Prandtl numbers 550 to 1000. The experimental results showed that low critical Reynolds numbers at the range of 100 to 200 were attained within all the experimental tubes, which indicated that 3-DIFT could obvious accelerate the transformation of high viscous fluid from laminar flow to turbulent flow. It offered a particular advantage to enhance the convective heat transfer of highly viscous fluid. Empirical equations on flow resistance and heat transfer were obtained using a least-squares regression. Compared with empty smooth tube, the maximal thermal performance factor for the turbulent flow within 3-DIFT could be enhanced up to 3.61. The optimization on shape of 3-DIFT for further augmentation heat transfer was also obtained.

Abstract: In this paper, an orthogonal experiment design method has been used to optimize the resistance microwelding (RMW) parameters for the fine copper wire and SUS304 stainless steel thin sheet welds. A L25(5⁶) orthogonal array for three factors (welding current, weld time and electrode force) with five levels was used. Joint breaking force (JBF) and surface appearance were selected as the index of evaluation. The results show that welding current was the most influencing parameter on both joint strength and surface appearance, and weld time had the next most significant effect. The orthogonal experiment design method was proved to be a promising technique to obtain the optimum conditions for RMW of fine copper wire.

Abstract: In order to improve their stress distribution and service life, the shape of Belt-type cylinders with Φ40.5mm inner diameter is optimized based on the FEM simulation and orthogonal design. The important order of the factors affecting the stress distribution is found out after the orthogonal FEM simulation calculation. The maximum principle stress is reduced and stress distribution is improved. The cylinder’s life is extended while the cost is down.

Abstract: Processing parameters of micro thixoforming, such as height-diameter ratio, die/punch temperature, billet temperature, and punch speed, have direct and complex impact on final quality of the workpiece, which is to be applied as the reaction plate of a microreactor for hydrogen production from methanol steam reforming. The micro/meso features of the workpiece, which is for catalyst loading, are micro-pin-fin arrays. Size of the surface area and uniformity of the pin-fins are quantified by average height (Ha) and relative standard deviation (RSD). An orthogonal experiment design is adopted to investigate the influence of the parameters on the semi-solid forming process. The results of the orthogonal experiment show that the optimum parameters are 150 °C for die/punch temperature, 576 °C for billet temperature, 0.14 for height-diameter ratio and 8.33 mm/s for punch speed. The experimental results validate that the optimized processing parameters can improve the quality of the reaction plate with micro-pin-fin arrays.