Akademik Veri Yönetim Sistemi
4th International Operational Modal Analysis Conference, IOMAC 2011, İstanbul, Türkiye, 9 - 11 Mayıs 2011, ss.111-119
Experimental modal analysis (EMA) identifies a modal model from recorded test inputs and measured vibration responses. Recently, system identification techniques were developed to identify the modal model for operational responses with output-only model (OMA). OMA takes advantage of the ambient excitations. During EMA, scaled structure reconstructed to test in laboratory conditions can differ significantly from the real-life operating conditions. Insitue experimental modal analysis (IEMA), which is alternative to EMA intrudes more accurate and consistent results along with robust techniques.
In this study, assessment of the input noise, power of the input and influence to results is studied using real test data recorded from insitue experiments. In case of harmonic excitations in the output only model, story transfer functions are proposed to eliminate the effects of the pseudo-modes assuming that all structural members as well as the rigid diaphragm floors in the structure will be exposed to identical harmonic input.