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Reallocation index based sensor network design
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DOI：10.1016/j.jlp.2017.05.026.png)
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Recently, the concept of reallocation index has been proposed in literature for sensor network design. In this work, we extend this concept to enable base case design of sensor networks for various criteria. Reallocation index indicates the possibilities of future reallocation of sensors while retrofitting an existing design. Higher value of reallocation index indicates more possibilities of reallocation of sensors that can be more cost effective than adding (upgrade) new sensors. Reallocation index is maximized as an additional objective while performing base case design of a sensor network. The resulting design is then optimal not only for the base case, but also ensures that any future upgrade and reallocation can be carried out effectively with less cost. The proposed sensor network design approach is illustrated on three types of sensor network design problems, namely selecting variables to be measured to ensure: (i) robust design for reliable fault diagnosis, (ii) observability of process variables after a change in the process layout, and (iii) estimation of important process variables with low uncertainty. For each case, simulation based experiments are performed to demonstrate the utility of base case designs obtained after maximization of reallocation index. (C) 2017 Elsevier Ltd. All rights reserved.
Keyword:
Reallocation and upgrade
Optimization
Robust fault diagnosis
Observability
Estimation variance
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