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A new method to quantify human error probability (HEP) is proposed. Firstly, the general data are analyzed. The problems are pointed out when using the general data directly to quantify HEP. It is emphasized that the general data must be adjusted before being used in HEP quantification Secondly, the idea of CREAM basic method is introduced, and the process of its HEP quantification is shown. By analysis,...
Although MVC pattern is widely used in software design and development, bringing us many advantages, it still has weak points. Author puts forward an improved MVC and applies it to stowage plan component design in container terminal management system.
This paper gives the theoretical method to determine water-coming volume by using pseudo-tracer. According to the flow mechanism of tracer in reservoirs, the theoretical model of numerical simulation of tracer has been established. The method that is implicit to pressure and explicit to saturation for difference solution of model is used and a numerical simulation software has been designed. The calculation...
Geometry model, as a mapping on physical space to calculating space, is a foundation of numerical simulating. Aiming at a complicated object, reverse engineering technology was applied to model cylinder head. Using Pro/Engineering modeling software, inlet port, outlet port, up water jacket and bottom water jacket geometry bodies were modeled one by one. Finally, by Boolean calculation, a cylinder...
Imaging is a key factor for the steel sheet's automatic surface inspection system (ASIS) based on machine vision technology. Aiming at obtaining high-quality images of machine vision inspection system on steel sheet's surface, researched some key technologies of imaging system based on Line-scan CCD cameras. An illumination model on steel surface has been developed which is build on conditions of...
On the basis of detailed analysis to information technology in engineering fields points of view about PLM vs. ERP are discussed. According to requirements of designing collaboration, data sharing and business management, an integrated platform between Pro/I and SAP-PLM is implemented as a integration case. Besides, an integration solution centered at material quota and key technologies are proposed...
A modular, multi-level, integrated workflow is proposed for the development of complex product in this paper. The integrated workflow, which is driven by input/output template, pays more attention to design itself, not only emphasizes the business logic. The key problems in modeling the workflow are discussed to adapt workflow to the characteristics of design process of complex product. The dynamic...
This paper researched the forming theory of the cutting tools with helical teeth and complex surfaces. Deduced the nonlinear equations of the movement of NC system to generate such tools, presented the way to find the solution of the equations, calculated the cross section graphics of the teeth profile and computer simulation of NC machining.
In order to build extended logic manufacturing cell (ELMC) supporting rapid extended manufacturing (REM), the technology for ELMC based on similarity theory and clustering analysis was proposed. The question of ELMC was expounded, and computation of process similarity factor was introduced. The construction algorithm of ELMC was detailed discussed. Firstly, similarity matrix of processing task was...
The title panel information in engineering drawings is the important data source for product data management (PDM). Firstly, the data structure of title panel and bill of material (BOM) information in engineering drawing was analyzed, and the collected concourse based on the describing information cell was put forward. Then the text-objects and line-objects within the collection concourse were handled...
In this paper, an important method for computing the tool-path, and constructing the offset curves of pocket boundary generates its tool-path planning is the Contour-parallel strategy. But it is very difficult for the judgment and disposal of loop. The main disfigurement of the algorithm in the contour-parallel calculation includes to judge and dispose the linking of offset curves, and to take out...
According to the necessity for researching the optimization of enterprise energy-consuming based on model, the identification method for energy-consuming link in enterprise production process was researched. In view of the existing problems of Least Squares Support Vector Machine (LS-SVM), a modeling method based on nonparametric weighted feature extraction (NWFE) and LS-SVM was proposed. NWFE was...
The paper described the cutting process analysis with CAD systems by drilling. The start of process is defined from cutting process (with one the cutting edge). Simulation of machining (cutting and drilling). Finite Element Method (FEM) based techniques are used to simulate high speed machining processes and offer several advantages including prediction of tool forces, distribution of stresses, and...
The friction coefficients of hot tandem finishing mill were used to be set as a fixed value, which lead to 2000~3000 kN rolling force deviation in the prediction. During the hot rolling, the friction coefficient is affected by lots of factors and the variation principle is relatively intricate. In this article, the BP neural network consisted of an input layer, an output layer and one or several hidden...
Rapid product design is a new design mode for responding to various customer requirement rapidly. Reusing existing design resource is crucial in this mode. In order to meet the requirement of design resource share and reusability in rapid product design, this paper proposes a method based on tabular layout of article characteristics (TLAC) that generates part variant automatically. The TLAC is based...
A prediction model of agricultural mechanization is studied by means of applying Grey System theory and BP Neural Network (GMBPNN). The method is illustrated by example, and the results obtained by using the GMBPNN method are compared with that from GM (1, 1) and BP neural network prediction methods. The simulation results demonstrate the efficiency of our proposed algorithms, which offers a new way...
Design for cost (DFC) is a method that reduces life cycle cost (LCC) at design stage. From the angle of DFC, family cars' LCC data warehouse was established. It includes 300 thousand plus records about 3500 car models in last 26 months. Car's body structure, exhaust quantity, engine type, size(length, height, width), weight, transmission type, maximum speed, maximum power, maximum twisting moment/...
MES has presented important status in enterprise information management by the implementation and application of manufacturing execution system (MES) in the composite component manufacturing workshop of one aerospace enterprise. It indicates MES has been the linking between the production planning system at the higher level and the shop floor at the lower level. The status of production planning and...
This paper by providing complete network compatibility with enterprise, the OPC XML technology establishes an integration model for device to solve the problem. And the model of system integration is researched through the experimental platform. This paper presents FDT and its application of different communication profiles and intelligent devices in system integration. This paper indicates the disadvantages...
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