Advanced Materials Research Vols. 291-294

Abstract: In the research of flow and heat transfer of the diesel engine cooling system, the boundary condition determination was often a difficult problem. The paper calculated the flow velocity and convective heat transfer coefficient respectively for a six-cylinder diesel engine under different boundary conditions which including the water jacket wall as adiabatic condition, average temperature condition, and the boundary conditions from the solid-fluid coupling calculating. And the calculated values of the jacket wall temperatures were compared with that of test. The results showed that the simulation with solid-fluid coupling boundary conditions had better precision. Based on the research, an improved structure design was conducted for the six-cylinder diesel engine, the results of simulation showed that the average flow speed at the internal surface of water jacket could reach up to 0.5m/s, the flow symmetry in each jacket got improved, and the convective heat transfer coefficient could reach more than 2000 W/m2·K. The improved cooling system can meet the design requirements.

Abstract: Welding power source is an important research content in the field of welding technology. It is of significance to organize the design database of welding power source, develop its interactive website and construct its remote management platform based on web. In the scope of this paper, the core technology applied in above aspects were analyzed and summarized, the current development status and future trend of the application of computer and internet technology in welding power source areas were introduced.

Abstract: This paper comes up with a new general-purpose approach to integrating algorithm modules in all kinds of CAD software applications. In algorithm module integration of mechanical engineering areas, the new approach uses round-robin calculation of algorithm modules instead of traditional hard-coding or specialized configuring methods. Drawbacks of traditional algorithm module integration approach are analyzed in detail, and then the new approach is put forward and discussed accordingly. Using the new approach in CAD software applications, engineering fields can reinforce reusability of algorithm modules; implement parallel calculating of algorithm modules, and increase flexibility of algorithm module integration in engineering tasks. Most of all, it can improve engineers’ work and raise their efficiency.

Abstract: Application of spheroidal graphite cast iron in the production of spent-nuclear-fuel container contributes to improve the strength and toughness of the casting, because of the nodular shape of graphite. For a large-scale container, a forced-chilling technique is used to accelerate solidification process and raise spheroidization rate. In this paper, modeling of heat transfer in the container is performed. Influences of cooling media, inflow flux of coolant and thickness of sand layer upon the variations of cooling rate are systematically analyzed. Calculated results indicate that water as a coolant is more capable of enhancing the cooling course than air. Increasing inflow flux conducts an effective cooling job, whose influence is more apparent for air-cooling than for water-cooling. The role of decreasing the thickness of sand layer is most pronounced for raising solidification rate. The predicted cooling curves are compared with experimental measurements to validate the model.

Abstract: The electric field distribution was the main factor affecting on the current efficiency of electrolysis cell. So, the electric field distribution of magnesium electrolysis cell was studied to improve the current efficiency by two of main finite element softwares, COMSOL and ANSYS. The electric field distribution and its trends with the electrolyte change from 1.25m to 1.40m were calculated by using the two softwares. Form the results, the characteristics of COMSOL and ANSYS can be obtained. The conclusions of the paper will provided a significant reference for choose the appropriate software in practice process.

Abstract: In order to improve the retrieval speed and precision of images, the improved algorithm of extraction of image color features based on the both RGB and HSV color models was proposed in this paper. The algorithm can remove the repetitious vectors of compost in quantization process. While evenly quantizing model space, we can bring the compression of dimensions of image color features into full play and guarantee not to lose the main components of color features for color image. Then using RBF neural network and incorporating the values of color features, the image retrieval can be performed. The experimental results show that the data model of image color features in precise and high effective terms can be established and described by this algorithm, and the satisfactory results are obtained by applying the algorithm to the recognition of metallographic pictures for metallic materials. In addition, the algorithm can also be used in the evaluation of the discoloration of metallic casting alloys.

Abstract: In this paper, based on some kind of Car as the prototype, by using the multi-body dynamic analysis software ADAMS, the author Uses ADAMS／CAR modules establishes front Suspension, Rear Suspension, steering system brake system,body,tires and other models, then assembled into vehicle model, Established B,E-class road model as entering the road for vehicle ride comfort simulation analysis. Vehicle on different road ride comfort simulation, According to international standard ISO2631 and the vehicle for evaluation of ride comfort, the car are proved to be high performance in the ride comfort．

Abstract: The application of computer simulation technology in engineering design and analysis fields can effectively reduce product production cost, and improve the design efficiency. Through the computer simulation analysis of the key structure of gilling machine, the maximum stress value and its position of the working screw can be obtained in the working condition when roller’s linear velocity are at 1^st and 2^nd gear ratio, respectively, about 66.0m/min and 57.0m/min. In addition, in the assembly model simulation analysis of gilling machine structure, the influence of prestress simulation is considered and obtained the first 4 order’s natural frequencies and mode shapes in two kinds of gear ratios in those working conditions. It provides some suggestions that can be used to research the effect factors of gilling machine design, the gilling machine structure optimization and operating mode control.

Abstract: This paper introduces the mobile phone services and association rules, and a data mining method Apriori Algorithm is introduced and uses it to mine the frequency of mobile phone services,and referrals to salespersons to develop the mobile phone services which woud lead to maximum profit,and help mobile telecommunicaiton company to make decision on seveices planning.

Abstract: The successful matchings of the coal face equipments can fully play the effect of complete sets of equipments and achieve high yields and efficiency on coal faces .in this paper, ontology is used in the "three-machine"selection and matching knowledge modeling, which adopts the thought of combination on lateral and vertical modelings, and reuses the semantic body technology according to the characteristics of "three-machine" knowledge. As a result, the efficiency of ontology construction is improved largely and ontology structuration and standardization are strengthened. The ontology not only provides the exact knowledge representations, but also achieves knowledge reasoning and queries based on users to realize knowledge sharing and reusing. It provides a technical support for optimal matchings on" three-machine".