Advanced Materials Research Vols. 118-120

Abstract: This paper tends to find ways to replace aluminum alloy with a new kind of magnesium alloy for vehicle hubs, and also implements a dynamic design method for the hubs' weight-optimization and relevant analysis，so as to evaluate the strength reliability and modal characteristics. In comparison with most widely used aluminum alloys, magnesium alloy is one of the lightest commercialized metallic materials for structural applications. Magnesium alloys possess the attractive properties desired by automobile industry, such as low density, low cost, higher strength and out-standing damping capability. When used as wheel material, Mg alloys are able to reduce mass of the wheels, absorb vibration, damp noise emission, reduce fuel consumption and enhance acceleration and braking performance.

Abstract: This paper designed experimental system and the corresponding multi-particle coal particles experiments. At the same time based on computational fluid dynamics (CFD), we use Fluent as a tool to carry out the corresponding multiphase flow simulation experiments. The simulation results have a good consistency with the experimental results. Ultimately, we acquire the pressure drop calculation model and the simulation method of the multiphase flow pressure drop analysis inside the vibrated fluidized bed.

Abstract: In this paper, the wear mechanism of harmer head and plate of coal crusher of circulating fluidized boiler(CFB) is researched. In order to extend the life of the hammer head and screen plate, some new design is advanced on material and structures. A practical instance shows that these new design can extend the life of the hammer head and screen plate and improve the working efficiency of coal crusher. Also these can reduce the lingering time of the big hard coal lump in the crusher, reform and optimize the grade ratio of the crushed coal lump. In addition these researches are meaningful for energy saving.

Abstract: Product Data Management (PDM) enables the management of the entire product lifecycle and related information about its design and its manufacturing. The key of implement PDM technology is realization of the structure and configuration management about the product. The main functions of PDM and the product development process based on PDM are detailed in this paper. An implementation method is proposed and it is applied for a system by means of an example, which achieves a good result.

Abstract: Very high cycle fatigue behavior of high strength steel, were investigated using ultrasonic fatigue testing equipment at 20 kHz up to 109cycles. S-N curves at room temperature with different stress ratio (R=0.01 and R=0.1) was determined. The experimental results show that fatigue strength decrease with increasing number of cycles between 105 and 109. SEM examination of fracture surface reveals that fatigue damage was governed by the formation of cracks, and subsurface crack initiation was in the very long life range. The results shown that the portions of life attributed to subsurface crack initiation between 107 and 109 cycles are 99%.

Abstract: Based on maintenance support activity, support-activity centered computation model of utilization of non-repairable spares is set up by analyzing their support process; A mathematical model for two-contact closure queuing network was established by the Markov queuing analysis method based on analyzing the operation of a station-spares-warehouse system for support process, and a calculation model of utilization of repairable spares is given; In the end, the model is also used in a numerical study. It is an effective infrastructure theory support for equipment logistics support development department to analysis the spares allocation.

Abstract: Product information technology has been widely applied in manufacturing field, improved the rapid response ability of enterprises to the market demands, and to some extent enhanced the competitiveness of enterprise products. However, product data information generated by different information system has the characteristics of diversification and differentiation. The integration and management of these product heterogeneous data has become the bottleneck which restricts the development of enterprise information technology. Based on XML, this paper researches the integration and management of heterogeneous data, expounds integration structure of heterogeneous data, introduces integration process and schema mapping of heterogeneous data, and realizes schema translation of heterogeneous data. Finally, through the PLM XML schema which is provided by the product life-cycle management software, this paper verifies the integrated management of relational heterogeneous data on Teamcenter.

Abstract: This paper is based on the scientific modeling of large-scale elliptical vibrating screen which is widely used in many fields. Through the tool of harmonic analysis in ANSYS, the dynamic stress responses during steady state and transient process are studied. The results confirmed that the existing structure can fulfill the requirement of dynamic stress level. Another contribution of this paper is to provide a new idea to analyze the transient process response, especially when the motor data are not sure.

Abstract: Ship design is a complex engineering effort required excellent coordination between the various disciplines and essentially applies iteration to satisfy the relevant requirements, such as stability, power, weight, and strengths. Through, all-in-one Multidisciplinary Design Optimization (MDO) approach is proposed to get the optimum performance of the ship considering three disciplines, power of propulsion, ship loads and structure. In this research a Latin Hypercube Sampling (LHS) is employed to improve the space filling property of the design and explore it to sample data for covering the design space. To avoid the problem of huge calculation time and saving the develop time, a quadratic Response Surface Method (RSM) is adopted as an approximation model to study the relation between a set of design variables and the system output for solving the system design problems. A genetic algorithm (GA) is adopted as search technique used in computing to find exact or approximate solutions to optimize and search problems and appropriate design result in MDO in ship design. Finally, the validity of the proposed approach is proven by a case study of a bulk carrier.

Abstract: Modal analysis for the truss structures of machine tool is very important. based on ANSYS, according to the truss structures of machine tool, the modal analysis is carried out in this paper. Afterwards, the first ten natural frequency, corresponding mode shape is obtained. By means of animation, ten-order modal vibration rule has been analyzed. The modal analysis is made by ANSYS11.0. It provides the theory for the design and application of truss structures.