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排序方式: 共有101条查询结果,搜索用时 15 毫秒
1.
To solve the difficulty in describing the generic bill of material (GBOM) with the conventional tabular structure in a relational database system,a novel XML-based approach is presented to represent GBOM. It can represent and maintain one generic structure that encompasses all variants of a product. With the combination of product-oriented notation,this approach further gives a high degree of flexibility to support the user in the product variant specification task. The generic BOM system is then introduced for the particular product variant,and a prototype system has been developed. It is indicated that the presented approach is feasible. 相似文献
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A process planning system that generates alternative process plans offers multiple process plans for a part, thereby providing
the flexibility to cope with changes in shop floor status. In this paper, we introduce the concept of a process net as a model
for the generation of alternative process plans. We also show the usefulness of the process net model in generating alternative
process plans by implementing the developed system to construct process nets, and devising an algorithm to generate alternative
process plans for rotational parts. 相似文献
5.
Seok Jin Lim Suk Jae Jeong Kyung Sup Kim Myon Woong Park 《The International Journal of Advanced Manufacturing Technology》2006,28(5-6):618-625
Today’s business environment is experiencing as a period of expansion and the globalization. Therefore, a distribution plan
with low cost and high customer satisfaction in supply chain management (SCM) has been widely investigated. The purpose of
this study is to establish optimal distribution planning in the supply chain. In this paper, a hybrid approach involving a
genetic algorithm (GA) and simulation is presented to solve this problem. The GA is employed in order to quickly generate
feasible distribution sequences. Considering uncertain factors such as queuing, breakdowns and repairing time in the supply
chain, the simulation is used to minimize completion time for the distribution plan. The computational results for an example
of a simple supply chain are given and discussed to validate the proposed approach. We obtained a more realistic distribution
plan with optimal completion time by performing the iterative hybrid GA simulation procedure which reflects the stochastic
nature of supply chains. 相似文献
6.
The characteristics of turbine spacing for optimal wind farm efficiency were investigated using combined numerical models. The effects of wakes from upstream turbines were predicted by a model capable of determining velocity distributions on a rotor plane, based on Ainslie's approach. The performance results of a wind farm showed good agreement with measurements. The blade element momentum theory, in combination with a dynamic wake model, was applied. Wake model used the results of aerodynamic analysis as input properties. The optimal distance between wind turbines was predicted using a genetic algorithm to maximize efficiency in a wind farm. The results showed that the spacing between the first and the second turbines had the importance to the entire farm's efficiency. 相似文献
7.
The manufacture of a marine propeller typically requires long lead-time to generate five-axis tool paths. It usually takes several days to generate satisfactory tool paths with a general purpose CAD/CAM system. This paper proposes a novel methodology that generates effective five-axis tool paths for marine propellers. The machining of a propeller is accomplished in three steps: rough cut, semi-finish cut, and finish cut. For generating accurate finish cut tool paths, the proposed system computes check vectors that determine a maximum range of valid tool motion based upon tool size and passage width for each CL (Cutter Location) point along the tool path. Interference-free tool paths can be acquired by positioning the tool inside the two check vectors. The modelling capability for propellers is also of importance because it determines the eventual success or failure of the whole process. An iterative B-spline surface modelling technique is employed to improve the accuracy of the models and to increase the productivity. The proposed system generates interference-free tool paths with superior surface finish and reduces lead-time to manufacture a propeller. The system validation and sample results are given and discussed. 相似文献
8.
介绍一个能与产品CAD/CAPP系统集成的通用的机械产品图档文件管理系统的组成、功能及设计原理。 相似文献
9.
T. Tawakoli M.J. Hadad M.H. Sadeghi 《International Journal of Machine Tools and Manufacture》2010,50(8):698-708
Large quantities of coolant–lubricants are still widely used in the metal working industry, generating high consumption and discard costs and impacting the environment. Alternatives to current practices are getting more serious consideration in response to environmental and operational cost pressures. In the grinding process, promising alternatives to conventional dry and fluid coolant applications are minimum quantity lubrication (MQL) or near dry grinding process. Despite several researches, there have been a few investigations about the influence of different types of coolant–lubricants and grinding wheels on the process results. The current study aims to show the effects of the above parameters on grinding performance such as grinding forces and surface quality. The tests have been performed in presence of fluid, air jet and eleven types of coolant–lubricants, as well as, in dry condition. The grinding wheels employed in this study were vitrified bond corundum, resin bond corundum and vitrified bond SG wheels. The results indicate that SG wheels and MQL oils have potential for the development of the MQL process in comparison to vitrified and resin bond corundums and water miscible oils. Also, the lowest thermal damages, material side flow on the ground surface and wheel loading were generated by using the SG grinding wheel in MQL grinding process. 相似文献
10.
Contour pocketing computation using mathematical morphology 总被引:2,自引:2,他引:0
R. Molina-Carmona A. Jimeno M. Davia 《The International Journal of Advanced Manufacturing Technology》2008,36(3-4):334-342
Tool path generation problem is one of the most complexes in computer aided manufacturing (CAM). Although some efficient algorithms
have been developed to solve it, their technological dependency makes them efficient in only a limited number of cases. In
the article we propose a model that will set apart the geometrical issues involved in the manufacturing process from the purely
technology-dependent physical issues by means of a topological system. Presented in the paper there is a method for offsetting
any kind of curve regardless of the machining technology (i.e., independent of any tool geometry: spherical, conical, toroidal
and so on). Specifically, we use parametric cubic curves, which is one of the most general and popular models in CAD/CAM applications. 相似文献