Research And Application Of Bridge Vibration Monitor System

Along with the development of national economy, the road traffic is more important than ever. As the important node of the main trunk of the traffic, modern large bridge has the great significance to the transportation. And the safe of bridge contacts people's lives and wealth closely.Based on the experiment of Annulus-road made by ChongQing Road Science Institution of the Ministry of Transportation & Communication, we introduce the bridge monitor system of its vibration in the paper. The system has obtained the primary achievement in the aspect of bridge monitor. It can applied to monitor dynamic response of kinds of large public building facilities automatic, online, and timely, supplies datum and testing artifice for bridge design and really bridge monitor.The paper summarizes the up-to-date progress and research development in this field abroad and home, introduces several methods of the bridge inspection. Aimed at the special load of bridge, the author analyzes its dynamic response character. After the calculation of transverse-distributing load, the vibration model of bridge is established.After analyzing the sense principles and calculation expression for piezoelectricity, we compose a sense network, compare the difference between the voltage amplifier and charge amplifier, give out the electric circuit of piezoelectric sensor for measure system. The paper also analyzes the main factor influents the performance of piezoelectric sensor and the stick arts should be noticed in practice.The position of sensor id vital to the acquirement of signal, we locate the sensor network appropriate. According the system analysis, the software of the measure system used the object-oriented language to implement the requirement of system and complete the collection, procession, analysis, judgement , and graphic manifestation of the signal.Through the measure and analysis of the annulus-road, we give some example for analyzing the dynamic strain curve of its time domain and frequency domain to ensure the change of its vibration frequency after collection and procession the signal.The system gets some creative results as follows:1. Developed the special electric charge amplifier and scan drive circuit fitting for piezoelectric sensor array, resolved the problem of wastage and aberrance of signal transport long-distance while several sensor shared a set of charge amplifier.2. Resolved the problem of procession and distinguish of signal.3. Resolved the related technical problems meted in the embattling, installation and usage for piezoelectric sensor array, applied in the bridge and their dynamic response testing model.