Advanced Materials Research Vols. 156-157

Abstract: During processing, the interaction among the multi-parameters which influences the coating surface roughness is very complex. In order to gain rapidly the best parameters, this paper raises the method to optimize parameters of the micro arc oxidation based on the orthogonal design and the support vector machine regression analysis. The experiments were performed for the coating surface roughness according to the parameters designed by orthogonal on LD10. And then, the support vector machines regression was used to obtain the model between the surface roughness and the parameters according to these data. Further, the model optimized the parameters and predicted the corresponding coating with Ra1.025μm. At last, the model was verified by the experiments of single factor method under the same condition as the orthogonal experiments. The results, comparative analysis of the surface roughness of predicting and actual values generated by the same parameters, shows that the square error and the ratio of the average error influenced by the parameters expect for the temperature is less than 0.1 and 10% respectively, and the actual coating with Ra1.199μm was obtained that the parameters optimized by the model treated.

Abstract: The cleaner technology (CT) concept was applied to the household silk dyeing process, to develop a more environmentally friendly silk product. A selected CT technique, dye reduction, was experimented in an observed household industry’s dyeing process in Chaiyaphum province, based in the Northeast of Thailand. Wastewater characteristics, production expenses, and product quality and elegance were investigated to demonstrate that the introduced CT technique was appropriated for silk producers in the studied area. The studied amounts of dye used to color 1 kg of raw silk were 60 g (generally used in the household dyeing process in Northeastern Thailand), 45 g (25% reduction), and 30 g (50% reduction). Five favorite dye colors in the local/regional silk fabric market, i.e. rose pink, lime green, goldenrod, summer sky and lavender, were selected for the study. All the colors were from a silk dye brand which was broadly used in the studied area. Greater than developing a more environmentally friendly silk fabric, product development by raw material (dye) reduction regarding the CT concept also improved the production efficiency as well as the product quality. The results have shown that reducing the amount of dye used by 25-50% could reduce the chemical oxygen demand (COD) contents in wastewater by 20-40%, and also could reduce the production expenses, mainly for dye and water costs, by 15-30%. The fabric quality test has revealed that reducing dye could improve the color fastness of silk fabric. However, it was found that only the 25% reduction seemed to be able to give acceptable differences of all studied dye colors, except the lime green color.

Abstract: In order to improve brake performance of military tracked vehicles, a novel all electric brake system (AEBS) is studied in this paper. Besides its system scheme and construction are presented, its Object Oriented simulation models are built with Simulink to analyze its two operating modes, parking button brake and foot pedal brake. Screw linear speed and brake compressive stress in the parking brake and running brake under various given condition are simulated with the model. Simulation results prove that the performance of the all electric brake system improve remarkably and satisfy the design requirement of military tracked vehicles.

Abstract: This article uses UG to establish the three-dimensional model for the automobile cover panel parts, and establish a parts technological addendum surface and binder surface. This model has been converted to DYNAFORM, in which the parts finite element model is established. It also uses DYNAFORM software to carry out simulation analysis and orthogonal analysis of the geometric parameters of rib, obtaining the influence rule of the drawbead geometric parameters to drawbead resistance. It has studied the influence of many factors on the parts forming such as blank size, blank holder force(BHF), the material parameter and so on. The result shows that during the process of stamping, the shape and size of blank has played an important role in the sheet flowing; BHF has a great influence upon the wrinkling and cracking of the parts; material parameter, the value of r, mainly affects the drawing deformation while the value of n produces a great impact on the plane strain, bulging deformation. Through optimizing the shape and size of the blank and BHF, it obtains the best material properties parameters to satisfy the parts smooth forming that is: 0.25, 2.15. After the scene stamping production, it confirms the practicality of the optimization solutions.

Abstract: Based on the studies of the Standard, RNG models and SST model, a vehicle external flow field is calculated with three different models. Calculation results are compared with that of experiment. It is found that the error between the simulation results of the drag coefficient of RNS model and the wind tunnel experimental results are minimal. In the near wall region and airflow separation simulations, the simulation results of SST model are more close to the actual condition compared with standard and RNG models.

Abstract: To study the effect of assembly process information combining disassemble and assemble on satellite assembly sequence, this paper presents an object-oriented and assembly information integrated model, which is composed of static model and dynamic model. The feasibility determination based on Cut-set theory is presented and the construction algorithm of dynamic model is established by static model, the dynamic assembly model tree is obtained by analyzing in layers and verifying possible states using this algorithm, where the assembly model tree includes all the geometric feasible assembly sequences of satellite. Finally, this modeling method is verified by a satellite product.

Abstract: As an important approach of promoting Industrial Design in our country, international Industrial Design exchange activities are carrying out vigorously. With the increasing development of these kinds of communications, it becomes a critical issue that how to effectively and sustainably conduct these international communications to realize the true sense of learning from each other and improving oneself. This paper discusses some ideas on international Industrial Design cooperation and communications based on our own practical experience, and some examples are given.

Abstract: Titanium oxide coatings(TiO2/Ti) were formed on the titanium surface by micro-arc oxidation(MAO) in Na3PO4 solution.Using the TiO2/Ti as anod electrode, the titanium as counter electrode.Coated activated carbon(TiO2/AC) that prepared by sol-gel dipcoating method ,and activated carbon mixture as particle electrode,combining with the UV lamp and regulated power supply make up the three-dimensional electrode photoelectrocatalysis system. The photoelectrocatalysis system use Na2SO4 aqueous solution as supporting electrolyte.The photoelectrocatalytic ability of titanium oxide coatings were evaluated by photoelectrocatalytic degradation of methylthionine chloride aqueous solution.The experiment demonstrate that there was photoelectrocatalytic degradation of single TiO2/Ti film or only adsorbtion, the photoelectrocatalysis of three-dimensional electrode with particle electrode have the synergistic effect,which can improve the degradation of methylene blue aqueous solution.The influence of some factors was studied,including initial solution,cell voltage, electrolyte concentration and some other factors.When the methylthionine chloride concentration of 5mg/L, cell voltage of 8V, electrolyte concentration of 0.04M. The three-dimensional electrode photoelectrocatalysis degradation of methylene blue compare to traditional two-dimensional plate electrodes which without particle electrode increase 40.36% after 3 hours photoelectrocatalysis.

Abstract: Welding arc deposition is a high efficient rapid forming technology which can be used to rapidly form metal functional parts directly. While, Traditional slicing methods in the rapid forming process always produce ‘staircase’ or additional support structure which reduce deposition accuracy and efficiency, bring about the dissipation of materials. Even that it cannot exploit the advantages of welding arc deposition method. This paper proposes a slicing strategy which is suitable for rapid forming based on welding arc deposition. During slicing stage, the CAD model is decomposed into different pieces based on its geometrical feature to make each piece can be deposited in one direction without support structure, and layer thickness is determined according to the height of each sub volume and welding parameter database. A typical part is built with this method. It shows that this method is feasible and high efficient.

Abstract: We present a system to remove noise or smooth three dimensional (3D) virtual mechanical equipment models. Our system works not in well-known Euclidean space, but in Laplacian space [1, 2]. We transform the model from its global representation into the local representation. Then we manipulate the local property with the Laplacian Coordinates [1]. Our whole system can be modeled as a huge sparse linear system which can be solved very fast by state-of-art numerical solver [3].