Abstract
An original wireless sensor network for vibration measurements was
designed. Its primary purpose is modal analysis of vibrations of large
structures. A number of experiments have been performed to evaluate the
system, with special emphasis on the influence of different effects on
simultaneity of data acquired from remote nodes, which is essential for
modal analysis. One of the issues is that quartz crystal oscillators,
which provide time reading on the devices, are optimized for use in the
room temperature and exhibit significant frequency variations if operated
outside the 20–30°C range. Although much research was performed to
optimize algorithms of synchronization in wireless networks, the subject
of temperature fluctuations was not investigated and discussed in
proportion to its significance. This paper describes methods used to
evaluate data simultaneity and some algorithms suitable for its
improvement in small to intermediate size ad-hoc wireless sensor networks
exposed to varying temperatures often present in on-site civil engineering
measurements.
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