Horia FURDUI

32-75 METODĂ DE DETECTARE A DEFECTELOR GRINZILOR ÎNCASTRATE LA AMBELE CAPETE SUPUSE VARIAŢIILOR DE TEMPERATURĂ

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Gilbert Rainer GILLICH Horia FURDUI Ion Cornel MITULEȚU la de

METHOD TO DETECT STRUCTURAL DAMAGE
IN DOUBLE-CLAMPED BEAMS IN
CHANGING TEMPERATURE ENVIRONMENT
In this paper we present a method to detect damages in beam-like structures applicable if the temperature during structural monitoring is subject of changes. Experiments are performed on a steel beam for the intact case to attain a baseline. Afterwards, measurements are performed on a beam with known damage location. Comparison is made via Minkowski distance, and the location is found with precision, proving that the developed method is applicable for beams if temperature changes are present during monitoring.
Keywords: damage detection, natural frequency, temperature, filtering, correction, experimental method
Cuvinte cheie: detectarea defectelor, frecvenţe proprii, temperatura, filtrare, corectare, metoda experimentală

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32-74 FILTRAREA ŞI CORECTAREA VALORILOR FRECVENŢELOR PROPRII ALE GRINZII DUBLU ÎNCASTRATE EXPUSĂ INFLUENŢEI VARIAŢIILOR DE TEMPERATURĂ

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Andrea Amalia MINDA Gilbert Rainer GILLICH Horia FURDUI la de

FILTERING AND CORRECTION OF NATURAL
FREQUENCY VALUES FOR A DOUBLE-CLAMPED BEAM
SUBJECTED TO TEMPERATURE CHANGES
This paper presents the effect of temperature changes on the natural frequencies of beams. These may have perfect or elastic restraints at ends. A temperature increase produces compressive stress and consequently a natural frequency decrease. We contrived mathematical relations to evaluate the effect of temperature for the cases of perfect rigid as well as for elastic restraints. If the beam is imperfect, i.e. anisotropic, non-homogeneous or not strength in the initial state, a correction term has to be employed to accurately find the frequencies. The correction method is also presented.
Keywords: natural frequencies, filtering, correction algorithm, temperature
Cuvinte cheie: frecvenţe proprii, filtrare, metodă de corecţie, temperatura

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