Structural Health Monitoring (SHM) evaluates the integrity of a structure by
observing its dynamic responses by an array of sensors over time to determine
the current health state of the structure. The most important step of SHM is
system identification which in civil structures is the identification of modal
parameters of structures. Due to numerous limitations of input-output methods,
system identification of ambient vibration structures using output-only
identification techniques has become a key issue in structural health
monitoring and assessment of engineering structures. In this paper, four beams
with different boundary conditions and with arbitrary loading have been modeled
in finite element software, ANSYS, and the responses (Acceleration of nodes)
have been achieved. By using these data and the codes written in MATLAB
software, the modal parameters (natural frequencies, mode shapes) of the beams
are identified with FDD (frequency Domain Decomposition) and PP (Peak Picking)
methods and then justified with the results of input-output method which was
determined by frequency relation function (FRF). The results indicate a good
agreement between the three methods for determining the dynamic characteristics
of beams.Comment: Conference paper. arXiv admin note: substantial text overlap with
arXiv:2010.0749