Design Of Bridge Health Monitoring And Data Acquisition And Analysis

Bridge safety is a major world-renowned technology and social issues. Earthquakes,hurricanes, floods and other natural disasters, structure and material aging, corrosion,environmental changes caused by natural degradation, and poor management, shoddy work,corruption and some other non-natural factors, leading to structural damage or potentialhidden dangers, so that the people serious threat to life and property. However, it is difficult toaccurately predict natural disasters, natural degradation unavoidable fact, almost impossible todefend non-natural causes. Therefore, people hope that the future of bridge engineeringcharacteristics with the following aspects: the perception of biological structures within thesystem the way the state and external environment, and make judgments and reaction time; tothe internal structure of perception and prediction of risk, the overall and local deformationand damage of the situation; should have the information processing system that can quicklydeal with unexpected incidents, and can automatically adjust and control, so that the entirestructural system is always in top working condition.This paper begins by describing the significance of the bridge health monitoring, thestudy describes the current situation at home and abroad; of the theory of bridge inspection;describes the overall bridge health monitoring system design, and described the system testingprocess. The system has passed the provincial appraisal.System used as a piezoelectric film pressure sensor P-51, adopted a multi-sensorapproach, according to the theory of choice to optimize the sensor layout scheme. Pressuresensor under pressure, resulting in charge, and the size of the charge generated by the pressureto maintain correspondence between the size of the system based on this principle will bridgethe vibration signal into a charge signal acquisition and processing. Bridge health monitoringsystem based on the principle of sensor design4Road piezoelectric sensor amplifier circuit,the bridge monitoring system host board designed to ensure stability of the system, usinghigh-performance processor ATmega64. Data signal acquisition process using AD7708digital-analog conversion, and the AD7708front-end design and reasonable isolation circuitto achieve the interference effect. The host computer monitoring system continuously through software to read the data signal to obtain the data, and to value and display real-timetwo-dimensional image data in two forms, which can accurately reflect visually the currentpressure on the bridge vibration. Loads of different bridge model and the amount of load toobserve the vibration of the bridge, the software also can be done in real time correspondingto the data processing, real-time FFT transform and wavelet transform, the bridge can bevisually different load carrying capacity in the case of bridge vibration frequency distributionand trends, based on these changes to determine the bridge’s load carrying capacity and limits.This paper tests for bridge monitoring system was tested by loading the bridge on themodel volume and variety of different loads to simulate the actual destruction of the healthdamage to the bridge, the experimental data acquisition system acquisition, real-time PCmonitoring software reflect the bridge vibration amplitude and frequency changes. Fouriertransform of the data for detailed analysis, to determine when the bridge model underdifferent load changes. Software also can be combined with the data over time on the bridgeas a whole assessment of the situation.