فایل ورد کامل طراحی ساختار و تحلیل یک آزمایش توزیع‌ شده و سیستم کنترل براساس سیستم جدید تغذیه (تأمین) نیرو

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تعداد صفحات این فایل: ۱۴ صفحه

نتیجه‌گیری
با بهینه‌سازی ساختار شبکه سیستم کنترل و ترکیب انواع مد ارتباطی بطور اصلی، یک DTCS برجسته براساس سیستم جدید منبع (تأمین) نیرو برقرار می‌شود. سیستم جدید از کاستی‌ها و کمبودهای TCS قبلی قابلیت سازگاری ضعیف با استفاده از مد (شیوه) ارتباطی واحد و درجه پایین استقلال و خودسامانی زیرسیستم‌ها در TCS قبلی به علت تکنولوژی ساخت جدید و دقیق آن به دور است. همانطوری که با دلیل اثبات کردیم، آن بطور کامل می‌تواند نیازمندی‌های گواهی و تست‌کردن سیستم جدید منبع (تأمین) نیرو را برآورده سازد. مبانی و مفاهیم طراحی و ایده پیشنهاد شده در مقاله که برای ایجاد و برقرارسازی DTCS جدید به کار برده شدند، تا حدودی دارای ارزش مرجعی و استنادی هستند.

عنوان انگلیسی:Architecture Design and Analysis of a Distributed Test and Control System Based on New Power Supply System~~en~~

INTRODUCTION

Accompanied by rapid development of computer network technology, control technology, testing technology and intelligent sensor technology in recent years, Test and Control System(TCS) has taken a great leap from a simple instrument to a centralized computer teat and control, then to a Distributed Test and Control System (DTCS) [1~2]. There are many ways to construct a DTCS, but main part of the DTCS is Client/Server(C/S) mode for its simplicity and intuition [3] . However, C/S mode only simply classify autonomous behavioral entities as ‘control client’ and ‘test server’, and interactive relationship between them is limited to control the client’s request and test the server’s passive response. Therefore, If we use the C/S mode to build a DTCS, we may find it hard to confirm the server’s location in a network, hard to handle the interoperability and load balance, as well as difficult to upgrade the client. To overcome limitations of the C/S mode describe above, many scientists and scholars have put forward new improved modes, such as web-based mode, B/S-based mode, middleware-based mode(multilayer C/S mode), and have been applied to build a DTCS in practice[4~8] . Primary data interactive modes used in DTCS network are listed as following: RS232C/RS485: The most common lower layer protocol of serial communication interface, which usually sensitive to noise and transport distance. Especially when system operating environment is relatively poor, it often causes data signal distorted and serious delay[9]. Industry fieldbus: we can make data exchange in time by using many kinds of fieldbus. Since there isn’t an unique communication standards because of market competition, equipments used different fieldbus can’t really be interconnected till now. This limitation have seriously hampered promotion and application of industry fieldbus[10~11]. Ethernet: this technology enjoys rapid rate and short frame in data transmission. However, because of uncertainty of CSMA/CD protocol in data link layer, real time ability of the Ethernet is very poor[12]. It can draw a conclusion from above that each communication model has its advantages and disadvantages respectively. Only using a single communication mode for DTCS designing and application may easily lead to functional deficiencies and partial insufficiencies in TCS. Based on actual requirements of the new power supply system, this paper built a new DTCS using a multi-communication mode, and adopting a novel network architecture called single-C/multi-S mode. Meanwhile, a variety of data exchange models is combined to design and develop a new DTCS. Technologies and equipments related to three basic sectors(electricity generation, distribution, and consume) of electrical system in a vehicle during operation are argued, analyzed, developed and demonstrated using the new designed DTCS based on based on DC power supply system in high voltage. It is proved that the designed DTCS meets the test requirements through experiment, and the system has a certain significance for promotion and reference. II. ANALYSIS AND DESIGN OF THE SYSTEM According to specific functions of each node, the DTCS is built with three layers and two-level network based on new power supply system. Its detail structure is illustrated in Fig.1. Three layers of the DTCS are named Manage Layer (ML), Control Layer (CL) and Execution Layer (EL) according to specific features of each layer. Each one is connected with adjacent layers by data cables to form the two-level network. ML contains the remote control facility and data storage device, which connects to every test and control subsystem on site in a star topology. By acquiring all data from each test and control subsystem, the remote control facility can reflect real time operation conditions of them correctly. Data storage device collects all valid operation data of the system, and stores them into a database using certain format and rule. It is also capable of feature querying historical data, alarm and malfunction records, so entire operation condition of the system can be statistical, analyzed as well as the following results printing out. The printed results can be used for backup and in query.

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