Low-Cost, Efficient Output-Only Infrastructure Damage Detection With Wireless Sensor Networks
提出一种利用无线传感器网络监测环境振动并与基准响应对比来评估结构状态的损伤检测方法，通过查找表技术大幅降低计算量，仅需少量整数和浮点运算，在低功耗微控制器上实现约五倍加速，并研究了传输功率与测量次数的权衡。
Structural health monitoring (SHM), which is the process of gauging the health of instrumented structures, is becoming increasingly important as much of the world's transportation infrastructure ages and deteriorates. Wireless sensor networks (WSNs) have the potential to deliver continuous SHM at a low cost. We present a novel WSN system that monitors ambient structural vibrations and looks for deviations from a baseline response to assess the condition of the structure under observation. Efficiency is achieved by implementing our damage assessment process with an innovative wireless-sensor-based technique involving look-up tables. By using look-up tables we are able to minimize computations. Only 4-6 integer and two floatingpoint operations are required per damage assessment. This is in contrast to the majority of other methods that rely on precise engineering models of the monitored structures. Our look-up table technique is benchmarked against the brute force approach, which involves solving equations, by measuring the execution time of each implementation on a low-power Microchip microcontroller. Here, we were able to achieve a speedup of roughly five. In addition, we investigate a tradeoff between average transmission power and the number of measurements required to make a decision as to the structure's condition. Finally, we benchmark our damage assessment process using a case study to verify its efficacy for bridges.