Application Of Wireless Sensor Network Monitoring For Water Temperature Difference In Blast Furnace Cooling System

Wireless sensor networks applied in traditional environmental monitoring is featured with random placement of sensor nodes, high-density, self-organization. However, when wireless sensor networks for industrial equipment monitoring, its characteristics changed: sensor nodes placement is constrained and distribution is uneven. The dissertation focus on nodes placement strategy and MAC protocol, studies key technologies and design of wireless sensor network with placement constrains, designs and constructs Wireless sensor networks system with placement constrains, implements integration and application in an industrial environment.The main contents and results are as follows:1) Because of wireless sensor nodes with placement constraints and uneven distribution can't self-organize network connectivity, proposed a relay node placement strategy under the life cycle of network to make network connectivity, and used data streaming strategy and data gathering strategy to reduce the number of nodes, thus reduced the cost of the system. The results show that comprehensive implementation of data streaming strategy and data gathering strategy can reduce the number of relay nodes.2) After the relay nodes placement strategy implementation, it formed tree topology architecture. By analyzing the energy consumption and data transmission delay in the wireless sensor networks, proposed a MAC protocol-HMAC. HMAC used two levels TDMA (Time Division Multiple Access) mechanism in data gathering tree, and used similar DMAC staggered scheduling mechanism in data transmission between the same branch nodes. The results show that HMAC effectively can reduce energy loss and data transmission delay.3) Proposed a time-slot method to meet with requirement of HMAC protocol, and allocated sequential time-slot to nodes with the fixed length schedule packet. Compared with the random allocating time-slot method, it avoided the energy consumption that is due to time-slot allocation nodes multiplying bring out scheduling packet length increased. In addition, aware of the schedule packet loss that will cause the failure of slot allocation, presented a way by intercepting the other nodes to determine the time-slot to improve the reliability of the slot allocation. 4) In view of the scene monitoring equipment, developed hardware equipment for nodes and design software including the driver, HMAC protocol, and application.Based on the above results, successfully implement temperature monitoring system based on wireless sensor networks. Monitoring results shows that the measured data is accurate, communication is reliable.