Applied Mechanics and Materials Vols. 201-202

Abstract: In the previous complexity measurement models of manufacturing system (MS), all the resources in enterprise were taken into account, so the result is that the models required large amount of information, which makes the model difficult to expand in practice. As the manufacturing system efficiency is determined by key resources. Only improving the key resources production efficiency can the MS efficiency be improved. So the manufacturing system complexity has to been measured based on the key resources firstly. The Optimized Production Technology is applied to the complexity measurement of MS and a new complexity measurement was proposed. With the information entropy, a static complexity measurement model and a dynamic model are built based on key resources. A case was used to verify the feasibility of the developed model. The advantages and shortcomings of the manufacturing system's complexity measurement were deduced based on key resources at last.

Abstract: Laser induced interstitial thermotherapy (LITT) is a useful method for the treatment of tumors. In order to control the treatment of LITT, a new local control technique has been put forward. A functional near infrared spectroscopy (fNIRS) system was used. The temperature of biological tissue is regarded as the most important indicator for treatment of LITT. So, the propagations of near infrared laser in normal tumors and liver tumors were simulated with Monte Carlo method. Based on the distribution of light in normal tumors and liver tumors, the temperature distribution inside tissue under laser irradiation has been retrieved. Furthermore, the influences of laser power and action time on the temperature field were studied. The results show that the normal tumors and liver tumors have different light absorption with laser beam. The difference of temperature distribution in tissues with the same laser power is useful to apply in control the treatment of laser-induced interstitial thermotherapy for liver tumors. It is confirmed that the fNIRS can be a useful local control technology for LITT.

Abstract: Automobile, aerospace, and other industrial sectors have evolved over years on product life-cycle management (PLM) systems. Product design and simulation have been long used to support their enterprise-wide engineering activities. This paper describes, in detail, a case study and solution of a simulation process management project called performance simulation model (PSM) .We focus on several research issues, including integration of design process and simulation process, simulation data management, simulation flow management, and the architecture of PSM. A prototype for PSM that allows a unification of design process and simulation process by PDM’s engineering Bill of Material (EBOM) is presented. The prototype has been used successfully for static analysis of transmission system.

Abstract: In the market-management electronic training system, the students act as various roles to be familiar with the business process and learn marketing knowledge. The paper first introduces four function modules, and then expounds the operation process and the decision tasks through the figures, finally should make important strategic planning and business objectives, analyze and discuss carefully every job, use various kinds of knowledge comprehensively to operate on the companies and get the better performance.

Abstract: The purpose of the paper is to analyze the development trend of modern coal chemical industry and its restrictive factors. Through GE matrix analysis model，this paper puts forward some technical methods on developing modern coal chemical industry for the western China coal area. The better technology for coal chemical industry is using different stages of hierarchical transformation, quality priority utilization patterns that is derived from coal tar, coke oven gas and other high value-added components, improving coal added value in fractions of carbon utilization rate. This technology can not only improve the utilization efficiency of coal resources greatly, but also reduce the pollutants and greenhouse gas emissions effectively.

Abstract: Because most of the asymmetric shaft-parts have relatively large size in the axial direction, single-wedge cross-wedge rolling (CWR) exposes many imperfections, such as the huge roller, higher cost etc. The paper adopted finite element method (FEM) to simulate multi-wedge synchrostep CWR (MS-CWR) based on the typical asymmetric shaft-part, and gained its distribution and characteristics of stress and strain. In the knifing stage, the deformation of work piece only emerges on the local region, but in the stretching stage, most of regions are observed the deformation except two ends of the billet and the transition position between inner and outer wedge of multi-wedges. The results offer theoretical basis for promoting and applying MS-CWR technology on asymmetric shaft-parts.

Abstract: The analysising of strain is the key factors to understand the forming mechanism of cross wedge rolling asymmetric shaft. due to the extrusion of dies and other external force, its interior,interactions can cause the relative position between the various parts. In order to study the deformation of workpiece at different degrees, pulling in the finite element strain field analysis, the strain of the analysis at deformation process is also a necessary precondition for forming and stress distribution. In this papre,By using Deform3D platform, the forming process of the cross wedge rolling on parity wedge asymmetric shaft is simulated. It is also to be analyzed the distribution and variation of the amount of strain in the rolling process, it shows that a cross-sectional and longitudinal section about the deformation characteristics of the strain fields, the results can achieve production of cross wedge rolling and provide important theoretical foundation to promote further cross-wedge rolling.

Abstract: High-speed and heavy-load are the targets to pursue over a long period of time in high-speed transportation. The key to solve this problem is making the components lightweight. Particularly, the hollow shaft is a new type of lightweight construction. This article explains systematically the current situation and the defects of forming technique for the hollow shafts. The solid shafts formed by Multi-Wedge Cross Wedge Rolling (MCWR) and the hollow shafts by Cross Wedge Rolling(CWR) are researched, and the key problems of hollow shafts formed in MCWR to solve emphatically are pointed out. At the same time, we obtain that MCWR will be the main technology in forming long shafts. The results in this paper provide a new direction for the hollow shafts to form in a high efficiency, energy saving and material saving method.

Abstract: Laser welding process has been widely used in industrial manufacturing. The purpose of this paper is to explore the inter-relation between laser welding results and the laser-induced plume behavior. High-power disk laser welding of stainless steel type304 was performed at different welding speeds. Combing the high speed camera and ultraviolet sensing filter, the plume image sequences of laser welding process have been obtained. Plume features including plume volume and plume flowing direction have been extracted by using high-speed photography and image processing technology. The dynamic behavior of laser-induced plume was investigated. The results showed that the laser-induced plume feature, especially the plume volume, was closely related to laser welding process conditions.

Abstract: The corrosion and preservation of archaeological iron are affected by many factors, among which the role of chloride ions is particularly important. Chloride ion migration and the choice of optimized potential during potentiostatic dechlorination of simulated cast iron artifacts in alkaline solution were studied by means of potentiostatic polarization. The results showed that the more treatment time and the more negative of the potential, the more was the extraction ratio of chloride ion and the less was the electrical efficiency. The potential was optimized with respect to the extraction ratio of chloride ion and the electrical efficiency, and the optional potential was presented.