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RISS 인기검색어
- 검색키워드
- 저자 : Vu Van Tan (검색결과 2 건)
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Vu Van Tan The Graduate School of the University of Ulsan 2010 국내박사
Manufacturers today require an efficient reaction to critical events and information occurring at the process plants for the monitoring and control or condition based maintenance. Device data need to be integrated into business processes in a standardized and flexible way. A monitoring and control system can be characterized as a distributed and integrated monitoring, control, and coordination system with partially cyclic and event-based operations. Its control functions can be divided into continuous, sequential and batch control. The role of continuous control makes process control system different from others like discrete manufacturing systems. In addition to control functions, such a system has other functions including performance monitoring, condition monitoring, abnormal situation handling and reporting. Remote operators in a distributed manner demand better and faster ways to achieve data and to react to plant functionalities anywhere and at anytime based on the leverage of Internet environments. However, little research has been done on developing systematic design methods or guidelines for the design of such systems user for monitoring and control of devices at the shop floors or plant floor. Unfortunately, the design methodologies used for computer based monitoring and control systems, as they do not consider the Internet environment issues such as time delays caused by the Internet traffic, concurrent user access, web services, etc. In addition, they are still far an ultimate solution for developing complex monitoring and control systems. The aim of this dissertation is to propose a SOA-based framework for developing complex monitoring and control software systems used in modern process and factory automation today where production processes will span over all types of systems. This framework is developed with the utilization of the OPC Unified Architecture (UA) specifications, Object-Oriented Design (OOD), the six framework design criteria, and the suggested design issues. It provides generic components upon which sophisticated production processes can be modeled. These six framework design criteria are in turn proposed and constructed by using a two-step requirement analysis including domain analysis and domain design. They make the proposed framework flexible, reusable, and compatible. To guarantee the security of remote invocations from heterogeneous environments for the proposed framework, the security solutions are developed and implemented to make such a framework capable and reliable. The preliminary simulation results are provided to demonstrate that the proposed framework has sufficient good performance and is feasible for applying to real monitoring and control system applications. The comparison between the proposed framework and the existing approaches and the discussion are also presented in this dissertation. A number of the advantages of the proposed framework when using for complex monitoring and control systems are indicated adequately.
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Aeroelastic flutter analysis of long-span bridges
Vu, Tan Van School of Civil, Environmental and Architectural E 2011 국내박사
Development of modern materials and construction techniques allow construction of extremely long-span bridges as well as skyscrapers. These structures exhibit remarkable flexibility, low damping, and lightweight exhibit strong sensitivity to a variety of wind-induced vibrations. Among them, wind-induced flutter instability is the most dangerous one in which the bridge oscillates in a divergent and collapse manner at certain wind velocity. The objective of flutter analysis is to predict the lowest critical flutter wind velocity as well as the corresponding flutter frequency. This dissertation studied the flutter analysis approaches of long-span bridges under strong wind based on flutter derivative without performing full model in wind tunnel tests. The accomplishment for the current research work can be categorized under three major areas as follows: (a) Development of simplified formulations in bimodal flutter framework (b) Development of engineering formulas that are tools for the aeroelastic stability analysis of long-span bridges at the preliminary bridge design stage; (c) Development of new formulation of self-excited force combining with the finite element method, and the full-mode and multi-mode method for analyzing coupled flutter of long-span bridge
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