Change control of a product data management (PDM) system is one of the major approaches for handling engineering changes today. During the change control workflow, there are three different dates utilized for engineer...
详细信息
ISBN:
(数字)9783642104305
ISBN:
(纸本)9783642104299
Change control of a product data management (PDM) system is one of the major approaches for handling engineering changes today. During the change control workflow, there are three different dates utilized for engineering change planning and scheduling: release date, effective date, and effectivity date. Effective date is the date that a documented change is implemented and applied to shop floor workshop. Effectivity date is the date that decision makers expect documented changes begin to be applied. In normal situations, multiple disciplines, such as design and development, purchasing, shop floor workshop, quality control, and so on, are involved in a change decision, which will be made on when a change is to become effective. The algorithm and theory of a possible add-on module to current PDM systems is presented in this paper. In this research, a mixed integer programming effectivity decision model is proposed to support changes of design scheduling, and production planning and scheduling concurrently when an engineering change occurred. The proposed model succeeded in solving an integration problem of change management issues (from product data management perspective) and production planning and shop floor scheduling issues (from enterprise resource planning perspective) for engineering change management.
As the number of handicapped people increases worldwide, intelligent Wheelchairs (IW) are becoming the solution to enable a higher degree of independence for wheelchair users. In addition, IW Projects relevance is inc...
详细信息
ISBN:
(纸本)9783642123832
As the number of handicapped people increases worldwide, intelligent Wheelchairs (IW) are becoming the solution to enable a higher degree of independence for wheelchair users. In addition, IW Projects relevance is increasing, mainly in the fields of robotics and safety-related systems due to their inherent and still unresolved problems related with environment uncertainty, safe communications and collaboration methodologies. This paper describes the development of new communication system, based on multi-agent systems (MAS) and motivated by intelligent Wheelchair systems. It uses a message-oriented paradigm as a mean for fault-tolerant communications in open transmission systems as well as a facilitator for entity collaboration. It provides an overview of the related work in the area, the background and the main constraints to system development, contextualized an IW development project. The results achieved enable us to conclude on the effectiveness and adequacy of the proposed communication model to the field of mobile robots, as well as to conclude that it may outperform JADE in several test scenarios.
Sheet metal forming is one of the most commonly used manufacturing processes. However, the conventional sheet metal forming process is expensive for prototyping and low volume production. To solve this problem, dieles...
详细信息
ISBN:
(数字)9783642104305
ISBN:
(纸本)9783642104299
Sheet metal forming is one of the most commonly used manufacturing processes. However, the conventional sheet metal forming process is expensive for prototyping and low volume production. To solve this problem, dieless forming process, also called the Incremental Sheet Metal Forming (ISMF), has become a focal point of the industry in recent years. Currently, ISMF technology is still premature and needs much research and development. This paper presents a novel ISMF process using a high frequency punch without support. This paper presents the studies of the ISMF process by geometric method, the FEM analysis and experiments. Finally, some conclusions are drawn as well as the future work.
The fundamental idea behind personalization is to first learn something about the users of a system, and then use this information to support their future activities. When effective algorithms can be developed to lear...
详细信息
ISBN:
(纸本)9783642106866
The fundamental idea behind personalization is to first learn something about the users of a system, and then use this information to support their future activities. When effective algorithms can be developed to learn user preferences, and when the methods for supporting future actions are achievable, personalization can be very effective. However, personalization is difficult in domains where tracking users, learning their preferences, and affecting their future actions is not obvious. In this paper, we introduce a novel method for providing personalized re-ordering of Web search results, based on allowing the searcher to maintain distinct search topics. Search results viewed during the search process are monitored, allowing the system to automatically learn about the users' current interests. The results of an evaluation study show improvements in the precision of the top 10 and 20 documents in the personalized search results after selecting as few as two relevant documents.
Nowadays, automobile industry builds and operates manufacturing systems in developing countries, e.g., low wage countries in order to cope with global market competition. System planners have to pay attention to the c...
详细信息
ISBN:
(数字)9783642104305
ISBN:
(纸本)9783642104299
Nowadays, automobile industry builds and operates manufacturing systems in developing countries, e.g., low wage countries in order to cope with global market competition. System planners have to pay attention to the conditions coming from the agreement between the investing companies and the developing countries. Normally, there are some limitations such as employing a certain number of workers. So a manufacturing system used in the competence location, i. e., high wage country should be reformed to fulfil the requirements of the conditions. In this paper, the planning method of designing the most appropriate system for manufacturing transmission gears in a developing country is presented. Thinking Process of TOC (Theory of Constrains) as well as 3D simulation of digital manufacturing methodology are applied to analyze alternatives and get results logically, quickly and objectively.
Extremely variable customer demands and increasing competition require a fast and efficient product development. Especially the industry for machining parts is forced to give an accurate estimation of costs and delive...
详细信息
ISBN:
(数字)9783642104305
ISBN:
(纸本)9783642104299
Extremely variable customer demands and increasing competition require a fast and efficient product development. Especially the industry for machining parts is forced to give an accurate estimation of costs and delivery time, besides forecasting the feasibility to gain a lead over competitors. STEP provides specialized application protocols (AP) for the integration of application systems from different fields of product development. In our long term research we are going to generate manufacturing variants using genetic algorithms under respect of a virtual factory environment. Therefore we require an application protocol specific interface for the integration of the STEP exchange structure from a physical file into the logical software layer. This paper gives an overview of our model that is fundamental for optimized product development and presents an approach for generating programming language dependent source code from the formal modeling specification language EXPRESS using the example of AP 224 and C#-.NET.
Due to rapidly development of technology and strictly competition in the context of global and concurrent economy, the requirements of customers such as quality, reliability, sustainability and cost of products are mo...
详细信息
ISBN:
(数字)9783642104305
ISBN:
(纸本)9783642104299
Due to rapidly development of technology and strictly competition in the context of global and concurrent economy, the requirements of customers such as quality, reliability, sustainability and cost of products are more and more high and tightened. Thus satisfaction of those is an important key of product designers. However, the product designers work principally on the nominal model of the product or virtual manufacturing within a CAD/CAM system. These models can only represent the nominal information of product and have not ability to deal with various kinds of deviations, especially geometric deviations generated and accumulated throughout the product life cycle stage by material defects, manufacturing errors, assembling inaccuracy, etc. These deviations can make the designed product not to meet fully and systematically the requirements of the customers and the users. Thus, it is necessary to take the geometric deviations into account the "real" performance simulation. In this paper, we propose geometric deviation modelling suitable for all stages of the product life cycle, especially manufacturing and assembly stages and a method to integrate the geometric deviations of the product into the "real" performance simulation. As a result, the product designers can generate the performance of the population of "real" products. They can thus verify that the product they are designing would have "real" performances satisfying or dissatisfying the requirements of customers and users.
The philosophy of software development has changed significantly in recent years. Build quality software more quickly is imperative in todays market, specially when it has to meet the demands of consumers. Not long ag...
详细信息
ISBN:
(纸本)9783642124327
The philosophy of software development has changed significantly in recent years. Build quality software more quickly is imperative in todays market, specially when it has to meet the demands of consumers. Not long ago a development team could consist of only one member, while today this is unthinkable, since the number of members in the development teams increases with the complexity of the actual issues. Collaborative programming or pair programming is one of the more relevant areas at present in providing efficient solutions to the working groups management, in such a way that their impact on the software development process is indisputable. The main purpose of this document is to gather the most relevant aspects of the collaborative models in a collaborative framework based on the use of software agents. In practice, the proposed framework is designed in a generic manner, allowing its extension to other environments and different domains.
With the advances in material engineering and the Rapid Prototyping (RP) technology, product design and realization are experiencing dramatic paradigm shifts. The new trend is that designers work with material scienti...
详细信息
ISBN:
(数字)9783642104305
ISBN:
(纸本)9783642104299
With the advances in material engineering and the Rapid Prototyping (RP) technology, product design and realization are experiencing dramatic paradigm shifts. The new trend is that designers work with material scientists more cooperatively to tailor material compositions/structures to achieve desirable properties and to exhibit better performance than those products using other available materials. In this paper, research on heterogeneous (HE) material-based product modeling is reported. To better represent various HE material-based product models, a set of NURBS (Non Uniform Rational B-Spline) and HE material-based design features have been developed. The features are not only suitable for regular shapes, but also extensible for non-regular and complex shapes. Algorithms for linear and non-linear transition between HE materials have been embedded in the features to enable users to address the functional needs. Another characteristic of the features is that geometrical variables have been used to model HE materials to improve their computation and processing efficiency in RP. In order to demonstrate the effectiveness of the research for complex products, a case study to develop a HE material-based bone implant is reported to explain the modeling process.
暂无评论