Papers by Keyword: Metamodel

Abstract: Ontology definition metamodel has been widely adopted in aspect of building ontology. However existing ontology metamodel is only suitable for building ontology in a certain domain. With collaboration and sharing among multiple domains, we face the seriously problem that is how to overcome semantic interoperability. For this problem, we need to combine general ontology with domain ontology and merge all existing ontologies by ontology metamodel. In this paper, we define main components of ontology metamodel and present conditional context and contextual concept unit. In addition, we introduce the method of mapping between conditional context and contextual concept unit. Finally, we use an example about information retrieval to illustrate its function and analysis its feasibility.

Abstract: In this work resource saving technique is used for shape optimization of 3D mechanical objects. According to statistical data, appearance of cracks in the areas of barrel support pads of tank wagons often causes damages to the barrels. The shape optimization of barrel support pads of a tank wagon is implemented and, as result, the concentration of stresses is significantly reduced in the barrel support areas. The optimization technique is based on CAD/CAE, design of experiment, approximation and optimization software packages. The shape of the support pads is defined by NURBS polygon points that serve as design parameters. For reduction of computational resources, FE models of tank wagon are replaced with high-quality metamodels which are based on locally weighted polynomials. The specific recommendations for the shape of the pads are given. As the second object truly spatial tetrapod is considered. The optimal curved shape of the tetrapod for lattice structure is elaborated.

Abstract: This paper investigates the connecting rod design and optimization of the engineering clamp hanger based on metamodel. The structure of the clamp hanger and the working load status of the connecting rod are firstly analyzed. Then the metamodel theory is applied to the connecting rod design and optimization: The metamodel of the connecting rod is set up in Solid Edge, and the design factors are signed as function-based parameters, with their geometrical relation changeless. The corresponding parameter value can be adopted by case-based inference means so that the required structure model of the connecting rod can be obtained. Finally, keeping the fine strength security and stability, the structure of the connecting rod is optimized. The presented research in this paper offers a new reference and thought for the hanger design and improvement.

Abstract: This paper presents a new approach for statistical analysis of process chains, including a parameter sensitivity analysis of each process step as a basis for dimension reduction, and an efficient interpolatory metamodel in order to predict new designs. A Monte Carlo alike evaluation of this metamodel results in the requested statistical information, e.g. quantiles of the output functionals. Numerical results are presented for the forming process of a ZStE340 metal blank of a B-pillar. Additionally, a brief overview of results of the process chain forming to crash is given.

Abstract: Global optimization techniques have been used extensively due to their capability in handling complex engineering problems. Metamodel becomes effective method to enhance global optimization. In this paper, we propose a new global optimization method base on incremental metamodel. At each sampling step, we adopt inherited Latin HyperCube design to sample points step by step, and propose a new incremental metamodel to update the cofficient matrix gradually. Experiments proved that the global optimization method has highest efficiency and can be finding global minimum fastly.

Abstract: —Metamodels have been widely applied in aircraft multidisciplinary design optimization (MDO) to alleviate the computation burden and improve the optimization efficiency. At present, there are various metamodel methods available, such as response surface method, Kriging model, moving least squares method, radial basis function, neural networks and so on. However, it is difficult to confirm which metamodel method is more promising, which is also an interesting question puzzled most designers. In this article, by using a series of numerical test problems with different inherent features, a comprehensive study is employed to compare five typical metamodel methods commonly applied in aircraft MDO under multiple metrics. In term of the comparison results, the conclusions are drawn and recommendations for selecting suitable metamodels in aircraft MDO practice are also summarized.

Abstract: The purpose of this study was to provide a unified modelling framework of Product Lifecycle Management (PLM). Firstly, the paper presented a Total Object Unified Model(TOUM) method which was used to abstract the concepts of manufacturing domain, format the meta-model of manufacturing data, construct the data model of PLM; Secondly, this paper presented three kinds of architectures based on TOUM to unify and simplify model, which are development architecture, deployment architecture and application architecture. At last, a model instance applied in a PLM product-CAXA V5 was shown based on the method of TOUM to confirm the validity of this method. This paper has provided a reference operation model and method for Product Lifecycle Management.

Abstract: Service cloud provides a platform to operate different kinds of services through Internet. Service monitoring is a crucial issue for the guaranteed service delivery in service cloud. However, most monitoring approaches in service computing domain are specific and focus on IT level. The challenge of how to monitor diverse aspect of different services simply and flexibly needs to be overcome. In this paper, we present a model-driven approach for service monitoring from both business and IT perspective. In the approach, a service monitoring metamodel is put forward to define various service monitoring models on demand. The resulted model can specify the monitored information and the monitoring process in both business level and IT level. A service cloud monitoring system for the approach is also described in this paper.

Abstract: A metamodel can be represented by the forms of mathematical equations (response surface models) or neural networks (black-box models) in the interest of correlating the inputs (parameters) with the outputs (responses) of a physical system. In view of little relevant research, this paper attempts to use response surface models as surrogates for FE models due to the provision of explicit equations and easy implementation in the aspect of modeling updating. Metamodeling is achieved by using the design of experiment involving the 2k factorial design and the central composite design for parameter screening and structural input-response modeling respectively. The feasibility of the proposed method has been demonstrated using a numerical beam example which proves the satisfactory performance of employing such metamodels in model updating based damage identification.

Abstract: In order to achieve the manufacturing resource sharing inside and outside the enterprise in the multistage manufacturing system, the multidimensional manufacturing resource concept model was presented from two aspects. The manufacturing resource application integration model faced application systems and the capacity manufacturing unit model faced manufacturing capacity were established respectively. The structure and modeling method of multidimensional manufacturing resource model based on meta-model was presented. The meta-model consisted of information layer, model layer and meta-model layer and unified the multidimensional model in the same model frame. Finally, the integration method of the model based on eXtensible Markup Language(XML) was established. The presented multi-dimensional manufacturing resource model can achieve the internal and exterior sharing in the networked manufacturing environment.