Development and Application of High-Sensitivity Wireless Smart Sensors for Decentralized Stochastic Modal Identification
Development and Application of High-Sensitivity Wireless Smart Sensors for Decentralized Stochastic Modal Identification
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DOI：
10.1061/(asce)em.1943-7889.0000352
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发表时间：
2012-06-01
期刊：
影响因子：
--
通讯作者：
Spencer, B. F., Jr.
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文献类型：
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作者：
Jo, Hongki;Sim, Sung-Han;Spencer, B. F., Jr.
最先进的智能传感器技术可以部署密集的传感器阵列，这对于复杂和大型土木结构的结构健康监测（SHM）至关重要。尽管最近成功地实现了各种无线智能传感器网络（WSSN）的全面SHM，低成本的微机电系统（MEMS）传感器中常用的智能传感器不能很容易地测量低电平的环境振动，因为它们的分辨率相对较低。结合使用传统的有线高灵敏度传感器与低成本的无线智能传感器已被证明提供改进的频谱估计的响应，可以导致改进的实验模态分析。然而，这种有线和无线传感器的异构网络需要集中收集大量的原始数据和离线处理，以实现全球时间同步;因此，许多优势的WSSN SHM丢失。本文介绍了一种用于Imote 2无线智能传感器（WSS）平台的新型高灵敏度加速度计板（SHM-H）的开发。使用少量的这些高灵敏度WSS，组成的SHM-H和Imote 2，作为参考传感器在自然激励技术为基础的分散WSSN策略进行了探索，并证明提供了一种具有成本效益的手段，提高模态特征提取的分散WSSN SHM。DOI：10.1061/（ASCE）EM.1943-7889.0000352。(C)2012年美国土木工程师学会。
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 highsensitivity 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. DOI: 10.1061/(ASCE)EM.1943-7889.0000352. (C) 2012 American Society of Civil Engineers.