129,744 research outputs found
Intelligent systems in manufacturing: current developments and future prospects
Global competition and rapidly changing customer requirements are demanding increasing changes in manufacturing environments. Enterprises are required to constantly redesign their products and continuously reconfigure their manufacturing systems. Traditional approaches to manufacturing systems do not fully satisfy this new situation. Many authors have proposed that artificial intelligence will bring the flexibility and efficiency needed by manufacturing systems. This paper is a review of artificial intelligence techniques used in manufacturing systems. The paper first defines the components of a simplified intelligent manufacturing systems (IMS), the different Artificial Intelligence (AI) techniques to be considered and then shows how these AI techniques are used for the components of IMS
AI and OR in management of operations: history and trends
The last decade has seen a considerable growth in the use of Artificial Intelligence (AI) for operations management with the aim of finding solutions to problems that are increasing in complexity and scale. This paper begins by setting the context for the survey through a historical perspective of OR and AI. An extensive survey of applications of AI techniques for operations management, covering a total of over 1200 papers published from 1995 to 2004 is then presented. The survey utilizes Elsevier's ScienceDirect database as a source. Hence, the survey may not cover all the relevant journals but includes a sufficiently wide range of publications to make it representative of the research in the field. The papers are categorized into four areas of operations management: (a) design, (b) scheduling, (c) process planning and control and (d) quality, maintenance and fault diagnosis. Each of the four areas is categorized in terms of the AI techniques used: genetic algorithms, case-based reasoning, knowledge-based systems, fuzzy logic and hybrid techniques. The trends over the last decade are identified, discussed with respect to expected trends and directions for future work suggested
Optimization of DC - DC boost converter using fuzzy logic controller
DC-DC converters are electronic devices used to change DC electrical power efficiently
from one voltage level to another. Operation of the switching devices causes the
inherently nonlinear characteristic of the DC-DC converters including one known as the
Boost converter. Consequently, this converter requires a controller with a high degree of
dynamic response. Proportional-Integral- Differential (PID) controllers have been usually
applied to the converters because of their simplicity.
However, the main drawback of PID controller is unable to adapt and approach the best
performance when applied to nonlinear system. It will sufer from dynamic response,
produces overshoot, longer rise time and settling time which in turn will influenced the
output voltage regulation of the Boost converter. Therefore, the implementation of
practical Fuzzy Logic controller that will deal to the issue must be investigated.
Fuzzy logic controller using voltage output as feedback for significantly improving the
dynamic performance of boost dc-dc converter by using MATLAB@Simulink software.
The design and calculation of the components especially for the inductor has been done
to ensure the converter operates in continuous conduction mode. The evaluation of the
output has been carried out and compared by software simulation using MATLAB
software between the open loop and closed loop circuit between fuzzy logic control
(FLC) and PID control. The simulation results are shown that voltage output is able to be
control in steady state condition for DC-DC boost converter by using this methodology.
Scope of this project limited only one types that is Triangle membership function for
fuzzy logic control
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