Development of the mat type crack detection equipment for bridges

本研究提出了一种新型的桥梁U形肋裂缝监测系统。在该系统中，利用杆侧的加速度传感器测量道路上脉冲产生的冲击波。仿真结果表明，传感器的位置对冲击波的探测非常重要。冲击波被一条裂缝反射，到达传感器。我们的模拟揭示了由脉冲引起的冲击波是如何从沥青通过钢材传播到传感器的。对传感器信号进行小波分析，估计其均方根值。在检查了它的分布模式后，我们可以检测到裂缝的位置。

In this research, new monitoring system which can detect a crack on U rib in a bridge was proposed. In this system, shock wave being caused by impulse on a road was measured using acceleration sensors on a roed side. Our simulation showed that locations of sensor were very important to detect shock wave. Shock wave was reflected by a crack and arrived at sensors. Our simulation revealed how a shock wave caused by a impulse propagated from asphalt through steel to sensors. Sensor signals were processed by Wavelet analysis and estimated its RMS value. After checking its distribution patter, we could detect a location of a crack.