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71.
ANDY Coots 《电子工艺技术》2006,27(3):138-140
现代制造商一直特别看重在变动过程中迅速重新配置平台型贴装机的灵活性,以便能够对变动后的产品实现最优的贴装能力.现在,平台型贴装设备上提供的新一代贴装头技术扩展了这些系统的能力,可以提供高速芯片贴装功能,实现能够在不需重新配置,不会影响精度、良品率或产能的情况下,贴装常用的各种元件.它能使未来几代装配商将从更加灵活、自适应和精确的贴装头中受益,他们将提高利用率,大大降低变动时间,明显减少支持高速度、低成本、快速交货周期制造环境所需的反应时间. 相似文献
72.
高维平 《吉林化工学院学报》1993,10(2):1-8
本文基于换热网络的过程模拟,借助于灵敏度系数,给出了一种简单有效的换热网络柔性指数计算的方法。当换网干扰变量变化并引起了控制变量的变化时,如有调节变量,可通过改变调解变量使控制变量返回到设定值。编制了计算机程序,调解曲线可在计算机屏幕上绘出,也可定点检验换网操作的可行性。 相似文献
73.
本文将柔性控制、智能控制的思想与传统测控系统结合起来,提出了基于PC的柔性智能测控系统集成平台的基本结构,对开发平台涉及的关键问题进行了讨论,最后给出了一种基于PC的柔性智能测控系统集成平台的模型。 相似文献
74.
This paper presents an evolutionary algorithm, called the multi-objective symbiotic evolutionary algorithm (MOSEA), to solve a multi-objective FMS process planning (MFPP) problem with various flexibilities. The MFPP problem simultaneously considers four types of flexibilities related to machine, tool, sequence, and process and takes into account three objectives: balancing the machine workload, minimizing part movements, and minimizing tool changes. The MOSEA is modeled as a two-leveled structure to find a set of well-distributed solutions close to the true Pareto optimal solutions. To promote the search capability of such solutions, two main processes imitating symbiotic evolution and endosymbiotic evolution are introduced, together with an elitist strategy and a fitness sharing scheme. Evolutionary components suitable for the MFPP problem are provided. With a variety of test-bed problems, the performance of the proposed MOSEA is compared with those of existing multi-objective evolutionary algorithms. The experimental results show that the MOSEA is promising in solution convergence and diversity. 相似文献
75.
The construction of a new generation of MEMS which includes micro-assembly steps in the current microfabrication process is a big challenge. It is necessary to develop new production means named micromanufacturing systems in order to perform these new assembly steps. The classical approach called “top-down” which consists in a functional analysis and a definition of the tasks sequences is insufficient for micromanufacturing systems. Indeed, the technical and physical constraints of the microworld (e.g. the adhesion phenomenon) must be taken into account in order to design reliable micromanufacturing systems. A new method of designing micromanufacturing systems is presented in this paper. Our approach combines the general “top-down” approach with a “bottom-up” approach which takes into account technical constraints. The method enables to build a modular architecture for micromanufacturing systems. In order to obtain this modular architecture, we have devised an original identification technique of modules and an association technique of modules. This work has been used to design the controller of an experimental robotic micro-assembly station. 相似文献
76.
77.
Only recently have methodical tools adequate to design real-time systems been formally introduced in design methodologies.
Naturally, they were present from the beginning, but due to the large diversity of embedded systems’ areas of deployment,
specially dedicated formalisms have been developed and used. High-level language programming and integration of modeling formalisms
into design methods eased the development of more complex real-time applications. With the emerging object-oriented programming
languages and design methods, their integration into larger information systems has become more transparent. It was the UML
methodology, however, which eventually merged also the design methods and concepts of real-time systems into a consistent
whole. It took a large consortium and a long process to persuade industry of the benefits the new integral methodology can
offer. On the other hand, there are some trade-offs, and there are some features not completely covered, yet. Here, a different,
more straightforward approach to program and design (embedded) real-time systems is presented. Since it emerged from the real-time
community, it includes most features relevant there. Independent of the UML profile for schedulability, performance and time
specification, a profile was devised for use in PEARL-oriented UML design. The strengths of the mentioned language and design
methods for QoS-oriented design of (embedded) real-time systems are emphasised throughout this article. 相似文献
78.
Flexibility performance: Taguchi's method study of physical system and operating control parameters of FMS 总被引:2,自引:0,他引:2
In present manufacturing environment, the manufacturing flexibility has become one of the strategic competitive tools. Flexibility refers to the availability of alternative resources. These resources may have varied parameters, particularly related to physical and operating system. These physical and operating parameters of alternative resources may influence the system's performance with the changing levels of flexibility and operational control parameters such as scheduling rules. Is increase in a flexibility level provides desired improved performance output? If yes, than under what conditions of physical and operating parameters and under which control strategy (CS)? Is improved performance is present at all increasing levels of flexibility? Flexible manufacturing system (FMS) being consist of numerous physical and operating parameters and complex in nature, the solution to these questions can provide an understanding of the productive levels of flexibility for a given physical and operating parameters of an FMS. This paper establishes the need of modelling of the physical and operating parameters of flexible manufacturing system along with flexibility and presents a simulation study under Taguchi's method analysis of these parameters. The paper contributes an approach to study the impact of variations in physical and operating parameters of an FMS and to identify the level of these variations that do not restrict the advantages of flexibility. The results show that the expected benefits from increasing the levels of flexibility and a superior CS may not be achieved if the physical and operating parameters of alternative machines have variations. Taguchi's method analysis indicates that relative percentage contribution of variations in physical and operating parameters of alternative resources should be negligible or minimum in the performance of FMS. Their increasing relative contribution may restrict the advantages of flexibility. If these variations are higher than increase in flexibility level may be counter productive. 相似文献
79.
《The Electricity Journal》2022,35(5):107126
Behind-the-meter (BTM) resources is being recognized as a viable solution to offer grid services including flexibility procurement which is required for volatile renewable power systems. This paper brings an overview of current and esteemed frameworks and respective challenges revolving around BTM flexibility notion and mechanisms. To begin with, we review grid architectures, e.g., microgrids and virtual power plants, capable of accommodating BTM flexibility and desirable flexibility market designs, including peer-to-peer trading. The role of machine learning initiatives, including reinforcement learning and probabilistic forecasting, in designing reliable energy management systems is extensively deliberated. Last but not least, supplementary discussions in making this concept a reality, which can be regarded as future research, are given. 相似文献
80.
Jean-François Hennart 《Management International Review》2007,47(3):423-452
Abstract and Key Results
相似文献
This paper reviews the theoretical rationale that has been advanced so far for a positive relationship between multinationality (i.e. international diversification) and performance. | |
We show that transaction cost/internalization theory implies no direct and general relationship between international diversification and performance. |