[논문]Numerical simulation of structural damage localization through decentralized wireless sensors

Jeong, Min-Joong; Koh, Bong-Hwan

Numerical simulation of structural damage localization through decentralized wireless sensors 원문보기

Jeong, Min-Joong (e-Science Applications Research Team, KISTI) , Koh, Bong-Hwan (Dept. of Mechanical Engineering, Dongguk University)

The proposed algorithm tries to localize damage in a structure by monitoring abnormal increases in strain measurements from a group of wireless sensors. Initially, this clustering technique provides an effective sensor placement within a structure. Sensor clustering also assigns a certain number of master sensors in each cluster so that they can constantly monitor the structural health of a structure. By adopting a voting system, a group of wireless sensors iteratively forages for a damage location as they can be activated as needed. Numerical simulation demonstrates that the newly developed searching algorithm implemented on wireless sensors successfully localizes stiffness damage in a plate through the local level reconfigurable function of smart sensors.

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문제 정의

The goal of this study is to develop an algorithm using both theoretical and heuristic functions relating to the functional transition of wireless sensor system [1~5] between active and inactive modes. For this goal, this study begins under two assumptions: First, all the sensors are scheduled to switch from sleeping mode to duty mode in a random manner.
This research demonstrates the potential capability of a wireless sensor system implemented for decentralized structural health monitoring. First, the clustering technique divides all the sensors into several sub-groups where a master sensor activates neighbor sensors as the measured strain value exceeds a predetermined threshold indicating damage occurrence within a structure.

제안 방법

Iteratively changing the role of master sensor among the activated sensor group effectively localizes the structural damage, similar to the steepest gradient searching in an optimization problem. The proposed approach exploits the intrinsically decentralized technique, i.e., only allowing data communication between the physically closest sensors, which is critical to the success of a coarsely populated, multi-hop wireless sensor network. The perimeter line of a sensor group searching for the steepest gradient in a damage-sensitive structural response, eventually encompasses the true location of the damage.
Therefore, measured data is transferred from point a to b through a multi-hop network. This study explains the procedural steps for the initial clustering of massively distributed wireless sensors followed by a numerical simulation of a plate structure having a stiffness-reducing damage. It will be shown that a concise and logical algorithm enables a small set of local wireless sensors to progressively search for the correct location of damage without relying on any type of global communication or control.

대상 데이터

Figure 4. Four clusters A (upper triangle), B (square), C (diamond), D (low triangle) and four master sensors (solid) are assigned out of total 300 sensors over the plate. The minimum distance between neighboring sensors is limited to 2.
Figure 1. Four master sensors are randomly selected out of total 679 sensors (hollow diamond). The minimum distance between neighboring sensors is limited to 3m.
It is assumed that structural damage occurs at two elements out of total of 900 finite elements in the model. Using commercial package ABAQUS, a stress analysis is performed.

이론/모형

This study employs the K-means clustering algorithm [6, 7] for sensor grouping. Once K numbers of sensor clusters _kare created, the central sensor, , can be defined for each cluster as shown in the following:

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구성항목	기본정보 상세정보 관리번호, 논문명, 저널/프로시딩명, 저자 , 발행년, 권, 호, 시작페이지, 끝페이지, 발행기관 관리번호, 논문명, 대등논문명, 저자 , 저널/프로시딩명, 발행기관, 발행년, 발행언어, 권, 호, 시작페이지, 끝페이지, ISBN, ISSN, 주제분야, 키워드, 초록(한글), 초록(영문), 저자(소속기관)
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Numerical simulation of structural damage localization through decentralized wireless sensors 원문보기

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Numerical simulation of structural damage localization through decentralized wireless sensors 원문보기

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