Instrumentation & Measurement Magazine 23-9 - 25

presence of tighthly coupled components, a condition which
makes the modal identification problem more challenging. To
stress this result, regions in grey background color are drawn
to evidence the frequency bands where most of the structural
energy tends to concentrate after merging together the information inherent in linear and angular measurements. As it
can be seen, the shape and the width of the identified spectral
peaks broaden the higher the frequency. Performing a cumulative evalutation, it may be argued that the spectral signature
of the frame is substantially defined by several well-resolved
components spread in the interval from 17 Hz to 200 Hz, the
cardinality of which varies according to the specific axis on
which each of them is likely to manifest. In spite of that, a common dominant mode is present and located nearby 180 Hz. By
monitoring how this frequency distribution varies over time,
the health assessment procedure can be effectively performed.

Online Data Retrieval

Fig. 3. Sensor installation plan over a 5-story frame.

In Fig. 5, evidence of the operations of the Data Acquisition and
Data Management layers over the same scenario are provided.
In detail, Fig. 5a shows a screenshot of the Thing registration/
discovery dashboard: the list of the sensors installed on the
metallic structure and currently active is returned. By clicking
on any sensor/Thing in the list, its TD is rendered; users can
read/update the values of the properties, execute an action or
be notified of the occurrence of an event. The measurements of
the active Things are gathered and stored in a database by the
storage module executed in background on the private cloud.

Fig. 4. Signals collected at sensing position C1.3 along the three axes: (a) time domain and (b) frequency domain representation of acceleration and rotational
data (blue and red lines, respectively). Regions illustrated in gray identify the frequency band associated to the most energetic spectral peaks.
December 2020	

IEEE Instrumentation & Measurement Magazine	25



Instrumentation & Measurement Magazine 23-9

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