Optimal Design Of Embedded Bridge Health Monitoring System

With the development and progress of science and technology and the continuous increase of the demand for transportation,the role of large Bridges in the social modernization is becoming more and more prominent.In order to monitor the damage caused by natural environment changes(such as earthquake and subsidence)or human factors to the structure of various parts of Bridges,it is urgent to improve the real-time,integrity and accuracy of the bridge health monitoring and assessment system.Therefore,it is of great significance to monitor and evaluate the health status of Bridges.Based on this,this paper designed a multimode and multi-node bridge health monitoring and evaluation system,and mainly completed the following work:(1)According to the monitoring objectives and contents,the use conditions,installation methods and layout environment of the sensors are analyzed to determine the final selection of sensors,and based on this,the hardware scheme of the bridge health monitoring system is designed and formulated.Three working modes of normal,human and privileged are designed,and the one-to-many communication mode between TCP host clients is used to complete the synchronous acquisition and transmission of multiple nodes and various types of data.(2)In terms of hardware,the method of host + slave is adopted to collect the health data of each measuring point of the bridge.The host system uses STM32 to realize the overall control function;The slave system realizes the function of acquisition and communication transmission by STM32 and FPGA cooperative processing.Analyze the logic mode and flow of the cooperation between the host,the slave and the upper computer,complete the program design of each part,including the design of the host slave STM32,the design of FPGA vibration excitation and frequency measurement,as well as the modular programming of the upper computer based on C# to realize each function,and finally complete the system test.(3)The existing bridge health status assessment methods are summarized and the deficiencies are analyzed.The advantages and inherent defects of AHP and fuzzy theory in the field of bridge health assessment are analyzed,and the single-objective optimization model of searching and calculating the global optimal solution by genetic algorithm is proposed for research..