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- Krüger, Markus, et al.
(författare)
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Impact-Echo-techniques for Crack Depth Measurement : Sustainable Bridges Background document D3.7
- 2007
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Rapport (refereegranskat)abstract
- A new concept for impact-echo testing systems is developed in this workpackage, includinga new device, small and easy to handle, robust and unproblematic regarding transportation. The system utilizes advanced impact generation for fast scanning techniques and reproducible impacts. The data acquisition, filtering and visualization of data are optimized for the inspection of large structures obtaining data at many measurement points. Regarding the software state-of-the-art requirements were implemented for both, scientific applications and field-tests. A new feature is the semiautomatic estimation of crack parameters like crack depth. The main objective of the work done in this project was to provide a quick and reliable measurement method for the detection and characterization of vertical cracks in combination with the detection of delaminations, honeycombing etc. in concrete bridges.
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| 2. |
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| 3. |
- Meyer, Jonas, et al.
(författare)
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Data analysis and reduction methodologies for wireless sensor networks : Sustainable Bridges Background document 5.8
- 2007
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Rapport (refereegranskat)abstract
- This report describes procedures and algorithms for data analysis and reduction methodologies regarding vibration analysis and acoustic emission techniques (AET) utilized for a prototype bridge monitoring system which is based on wireless sensor network (WSN) technology. The network consists of a terminal or base station (data logging and configuration unit), representing the data sink in the network, and several tens of sensor nodes spread over a bridge and representing the data sources. Each sensor node is equipped with sensors, a microcontroller and a radio transceiver. All nodes together form a multi-hop communication network.The laboratory and field tests described demonstrate that this concept is feasible even on low power WSN platforms and that it is a key element for the successful application of wireless sensor networks in long term structural monitoring.
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