A Wireless Sensor Network Using GNSS Receivers for a Short-Term Assessment of the Modal Properties of the Neckartal Bridge
A Wireless Sensor Network Using GNSS Receivers for a Short-Term Assessment of the Modal Properties of the Neckartal Bridge
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DOI：
10.3390/app7060626
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发表时间：
2017-06
期刊：
影响因子：
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通讯作者：
T. Kumberg;S. Schneid;L. Reindl
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文献类型：
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作者：
T. Kumberg;S. Schneid;L. Reindl
在本文中，我们提出了一种基于无线传感器网络的结构健康监测系统。这里展示的GNSS网络由三个GNSS漫游站和一个基站组成，部署在德国西南部A81高速公路上的Neckartal桥上。新开发的GNSS传感器节点支持高达20 Hz采样率的卫星数据记录。由于唤醒接收器在非活动期间实现了超低功耗，节点的使用寿命从20天到近200天不等，无需能量收集，取决于卫星数据记录周期。通过差分后处理，可以获得毫米级的精确定位信息。利用GNSS传感器，我们确定了共振频率为0.33 Hz和1.31 Hz，主要在桥的横向上。为了验证GNSS的结果，我们在桥上放置了一个加速度计。加速度传感器检测到的频率与GNSS传感器发现的频率相对应，尽管加速度计测量的频率更高，因为它可能对小幅度更敏感。
In this article, we present a novel structural health monitoring system based on a wireless sensor network for GNSS (global navigation satellite system) receivers. The GNSS network presented here consists of three GNSS rover stations and one base station that are deployed at the Neckartal bridge on the Autobahn A81 in southwest Germany. The newly-developed GNSS sensor nodes support satellite data logging up to a sampling rate of 20 Hz. Due to the ultra-low-power consumption achieved by the wake-up receiver during inactive periods, the nodes offer a lifetime from 20 to almost 200 days, without energy harvesting and depending on the satellite data logging period. By performing differential post-processing, precise positioning information in the millimeter range could be achieved. Using the GNSS sensors, we determined resonant frequencies at 0.33 Hz and 1.31 Hz, mainly in the lateral direction of the bridge. To verify the GNSS results, we placed an accelerometer on the bridge. The frequencies detected by the acceleration sensor correspond well to the frequencies found by the GNSS sensors, although the accelerometer measured further higher frequencies as it is probably more sensitive to small amplitudes.