Analysis for Environmental Sensitivity of Tunnel Wireless Health Monitoring System
Zhang Guozh · Technology of Highway and Transport · 2014
with ever increase of operating time of tunnels,disease of different degrees will occur to tunnel structures under the joint effects of driving loads,changes of geological and hydrological conditions,ageing of materials and construction of ambient environment,etc. Tunnel diseases have random characteristic in time and space. This paper introduces monitor of tunnel healthy conditions by means of tunnel wireless health monitoring system. The tunnel wireless health monitoring system is composed of wireless sensor,relay,base station and client end,and wireless transmission of the monitored data is realized by means of ZigBee technology. The wireless health monitoring technology is characterized by flexible arrangement,convenient installation and convenience for maintenance and management,etc. This paper tests and studies transmission distance and networking capability of wireless sensor under different field conditions including open fields,covered fields and operating tunnels,etc.,the result shows that the relative positions of relay and wireless sensor remarkably affect transmission distance,the transmission distance of wireless sensor inside the tunnel is not less than 100 m; and wireless sensor has strong self-networking capability and can realize mutual relaying.