Advanced Materials Research Vols. 118-120

Abstract: (Ca1-xAx)3Co4O9 (A: Sr, Ba) composition-spread films were fabricated successfully on TiO2 (100) substrate by combinatorial pulsed laser deposition (CPLD), and their thermoelectric (TE) properties and structure were evaluated by the multi-channel thermoelectric measurement system and concurrent X-ray analysis respectively. The largest power factor in (Ca1-xSrx)3Co4O9 film library was achieved as 1.67µW/cmK2. The influence of substitution on TE properties was investigated by doping Sr2+ and Ba2+ ions into Ca3Co4O9. However, there was little change of Seebeck coefficient in the range of 0≤x≤0.1 for (Ca1-xAx)3Co4O9 (A: Sr, Ba) films, which suggested that the substitution ions with smaller size were potential candidates for good TE properties.

Abstract: The artifact, which embodies the culture of the Tujia minority group at the Yangtze River basin, is the directest manifestation of Tujia people's idea of creating and designing tools. Bei Jia Zi is the very typical one of those artifacts. This article investigates the influence of traditional artifacts culture on the sustainable design of modern products, and concludes the crutial design elements affecting modern products from the develpmental trend of current ergonomics, based on the analysis of the emerging background, function and structure of Bei Jia Zi.

Abstract: The goal of this paper is to find out the combination point, through analyzing the characteristic of sustainability and product design process, and propose a set of design principles of sustainability which are suitable for product design process. In the process of product design, considering sustainability in parallel, designers will be able to obtain products with sustainability.

Abstract: The resources that product design relies on are more distributed than ever along with the varying of the global design environment. More and more resources outside of enterprises are needed during the product design process. The Modern Product Design platform supporting the product design under the circumstance of distributed resources will meet the requirement of the enterprise's product design and development under such conditions, and will simplify the implementation of the IT support system for integration of design resources outside of enterprises. In this paper the characteristics and supporting technologies of product modern design platform, which supporting the distributed design resource circumstance and centering on the enterprise, are studied. The building method of the platform is presented and a prototype of the product design platform is developed. Three subsystems are included in the platform; they are product requirements analysis system, product design planning system and design knowledge management system. Many design tasks can be supported on the platform, such as product requirement analysis, concept design, detail design, and experiment. The distributing, implementing, tracking and managing of product design lifecycle tasks can also be supported on the platform. The distributed design resources could be sealed as application components to provide design services. Design work flow model and knowledge flow model are built and controlled on the design platform. The design knowledge is managed based on the Six-Dimension Knowledge Classification.

Abstract: . The Design Structure Matrix (DSM) is becoming a popular representation and analysis tool for system and process modelling. A DSM displays the relationships between components of a system in a compact, visual, and analytically advantageous format which is a square matrix with identical row and column labels. The main goal in basic DSM analysis is to minimize feedbacks by restructuring or re-architecting the process, which is to say by resequencing the rows and columns of the matrix. This widely practiced initial step in analysis is called partitioning, block diagonalization, or block triangularization, and it involves an algorithm for getting the DSM in an upper-triangular form to the extent possible, with a minimum number of subdiagonal marks pulled as close to the diagonal as possible and grouped in blocks. As a consequence, we have to identify the activities which are coupled, the loops and reorganize the matrix in order to reduce the feedbacks. An application example has been presented to illustrate the power of DSM for product development process integration.

Abstract: With a view to improving product quality, the concept of generalized product quality is proposed and analyzed in depth to frame a comprehensive fuzzy evaluation system for generalized product quality, which includes all the constructional, operational and technological performance and function and takes account of the hierarchy and complexity of such an evaluation system. In the system the weighted value for each and every evaluation index is determined by combining entropy weight with subjective weight so as to make the evaluation more objective and scientific. Comparing with the method of comprehensive fuzzy evaluation, the evaluation system thus framed gets rid of the empirical subjectivity in determining index weight, thus enhancing the dependability of the weight, as a result, such an evaluation will be more reliable.

Abstract: Monte Carlo Simulation is a general method for evaluating a deterministic model by iteratively generating inputs so as to get the natural distribution of outputs, which has often been employed for risk analysis of development cost estimation under uncertain environment. However, the traditional way of implementing Monte Carlo Simulation on cost risk analysis is always based on deterministic Cost Estimation Relation (CER) model and does not take the uncertainty of history cost data used to build CER into account, which will considerably affect the cost risk analysis. In this paper, we extend Monte Carlo Simulation model to make its simulating process cover the stage of building model so that not only the inputs are iteratively generated but also the model is iteratively rebuilt. An example is carried out to compare the extended model to the traditional one on analyzing aircraft development cost risk, which shows that the risk distribution gotten by Extended Monte Carlo Simulation is considerably different to that gotten by traditional one.

Abstract: The dynamic performance of numerical control (NC) machine is not only basis of evaluation for the vibration resistance and stability, but also theory basis of optimizing dynamic performance, and improving processed quality. As digital design method, visual design realizes "visibility" during the whole design process, increases design efficiency and guarantees the quality, which make visual design preferred design method in large mechanical engineering. In this paper, the analysis of dynamic performance on NC machine and visual design method will be integrated, taking a NC machining center built by Shenyang machine tool group as a study case, the dynamic visual design flow to be proposed, including the design purpose, content and design methods, finally, the dynamic performance of visual simulation we have done, taking the strength, inherent characteristics and harmonic response into account, offers the foundation about structural performance optimization on the machine.

Abstract: Conventionally designed with quasi-static algorithm, buffer springs of impact mechanism eventually have a short fatigue life. By building a rigid-flexible hybrid model of GCD-1500 cable drill, the main fatigue causes of buffer springs are investigated so as to optimize the design of springs attached to impact mechanism. Dynamic simulation is used to export load spectrum of dynamic responses of springs in conditions of “idle impact” and different bore depths. Nominal stress method is employed in nSoft Software to analyze the fatigue of springs. Some crucial conclusions are drawn: the fatigue damage brought by load spectrum of dynamic response is more severe than that brought by quasi-static mono-pulse circulation; as the bore depth is prolonged, the damage of one impact will increase; the damage of “idle impact” is 25 times as serious as that of one impact when bore depth is 70m.

Abstract: With the development of Virtual Manufacturing (VM), Virtual Machine Tool (VMT) is presented as a new field of study, which can partially or completely achieve the main functions of the machine tool. As a result, it can improve the product design quality, short the product development cycles, and reduce the development costs. This paper presents a web-based virtual grinding machine tool system. Using the Internet 3D modeling language VRML 2.0, 3D graphic modeling of the machine tool is modeled. Combined with JavaScript language, the motion simulation, virtual assembly and machining process simulation are carried out. The system is based on VRML and B/S structure. Users only need to install a free plug-in, and operate the system with IE browser. Compared with the expensive CAD/CAM software, the system can be transferred on the Internet conveniently, and has free installation, low cost, portability and low requirements for the users.