Abstract
State-of-the-art smart sensor technology enables deployment of dense arrays of sensors, which is critical for structural health monitoring (SHM) of complicated and large-scale civil structures. Despite recent successful implementation of various wireless smart sensor networks (WSSNs) for full-scale SHM, the low-cost micro-electro-mechanical systems (MEMS) sensors commonly used in smart sensors cannot readily measure low-level ambient vibrations because of their relatively low resolution. Combined use of conventional wired high-sensitivity sensors with low-cost wireless smart sensors has been shown to provide improved spectral estimates of response that can lead to improved experimental modal analysis. However, such a heterogeneous network of wired and wireless sensors requires central collection of an enormous amount of raw data and off-network processing to achieve global time synchronization; consequently, many of the advantages of WSSNs for SHM are lost. In this paper, the development of a new high-sensitivity accelerometer board (SHM-H) for the Imote2 wireless smart sensor (WSS) platform is presented. The use of a small number of these high-sensitivity WSSs, composed of the SHM-H and Imote2, as reference sensors in the Natural Excitation Technique-based decentralized WSSN strategy is explored and is shown to provide a cost-effective means of improving modal feature extraction in the decentralized WSSN for SHM.
Original language | English (US) |
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Pages (from-to) | 683-694 |
Number of pages | 12 |
Journal | Journal of Engineering Mechanics |
Volume | 138 |
Issue number | 6 |
DOIs | |
State | Published - Jun 4 2012 |
Externally published | Yes |
Keywords
- Decentralized sensor network
- High-sensitivity sensor
- Structural health monitoring
- System identification
- Wireless smart sensor network
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering