|
In recent years, global demand for green energy widespread concern, the rapid development of wind power industry, so that governments, businesses, developers began to invest in the construction of wind power masts. In order to obtain investment in the construction of wind farms wind energy needed to assess first-hand information, the Chinese government in 2007 began planning and construction of wind energy resources professional observation network. As of April 2009 the country had built 400 masts. However, guyed masts shortcomings very prominent, because the main force cable tower part of the cable, if a node cable breakage or loosening of the cable slack node, can lead to loss of balance the whole mast collapsed. In addition, as the overall stiffness of the tower is small, and the tower and relatively high, so that the case in the event of high winds, the wind load effect, will cause the tower swing, the initial pull force if the time is not large enough, it will caused a sharp swing tower, eventually causing the whole tower overturning. Dowel off the rope, the rope breaks and other products and installation quality, as a result of theft, vandalism down the tower of accidents have occurred at home and abroad. Masts secure online monitoring system is in such demand raised in the context. With the development of communication technology, many current wireless network technologies have emerged, while the Zigbee technology is the most representative of a wireless personal area network communication technology, because of its simple protocol, low power consumption, low cost, easy networking, etc. characteristics of the commercial building automation, home networking, toys, and gaming peripherals, industrial systems, telemetry and other fields have a broad application. The General Packet Radio Service (GPRS) has a wide range of signal coverage, relatively fast data transmission, communications stable, always online, and features by meter fees, but also a packet-based data network, supports standard TCP / IP protocol. With the improvement of the network, GPRS many fields more and more applications. Based on a detailed study of Zigbee network, combined with the special circumstances of masts and structures designed to fit masts safety monitoring wireless network. A detailed description of the process of networking Zigbee wireless network, while the device how to build networks, to join the network and other issues detailed analysis. Then, explain the communication features and GPRS technology work basic principles, analyzes the GPRS network's TCP / IP protocol. Via the UART interface implements GPRS network and Zigbee network integrated structure. Finally, the introduction of the system hardware design and integration programs, Zigbee modules use Jennic's JN5139 module, GPRS uses Acer's H7710 module, the force sensor using LD-206 type side compression force transducer. According to details of the software process to achieve the upper and lower computer programming, to complete the entire system integration.
|