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Appl. Sci. 2017, 7(6), 626; doi:10.3390/app7060626

A Wireless Sensor Network Using GNSS Receivers for a Short-Term Assessment of the Modal Properties of the Neckartal Bridge

1
Laboratory for Electrical Instrumentation, Department of Microsystems Engineering, University of Freiburg, 79110 Freiburg, Germany
2
VMT GmbH Stegwiesenstr. 24, 76646 Bruchsal, Germany
This paper is an extended version of our paper published in 2016 SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, held in Las Vegas, NV, USA, 20 March, 2016.
*
Author to whom correspondence should be addressed.
Academic Editor: Gangbing Song
Received: 31 March 2017 / Revised: 30 May 2017 / Accepted: 8 June 2017 / Published: 16 June 2017
(This article belongs to the Special Issue Structural Health Monitoring (SHM) of Civil Structures)

Abstract

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. View Full-Text
Keywords: wireless sensor network; structural health monitoring; wake-up receiver; GNSS sensor network; GPS receiver; bridge; spline wireless sensor network; structural health monitoring; wake-up receiver; GNSS sensor network; GPS receiver; bridge; spline
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kumberg, T.; Schneid, S.; Reindl, L. A Wireless Sensor Network Using GNSS Receivers for a Short-Term Assessment of the Modal Properties of the Neckartal Bridge. Appl. Sci. 2017, 7, 626.

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