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Nadkarni, Ishan; Bhardwaj, Ritvik; Ninan, Stephen; Chippa, S.P.
Materials today : proceedings, 01/2021, Volume: 38Journal Article
This paper aims at identifying the dynamic characteristics of a structure, by Experimental Modal Analysis (EMA), necessary for predicting the response of a structure due to forces acting on it in the working environment. The three modal parameters namely- natural frequency, damping and mode-shapes are obtained using the aforementioned technique. Numerical validation is carried out using Hypermesh 13.0, a finite element package, to validate the results and check rationality of the assumptions. While the natural-frequency and mode-shape prediction using numerical methods is known to be fairly accurate, damping is very difficult to predict analytically due to the complex nature of physics involved. The damping obtained using this test is inserted as a material property in the FEA model to obtain FRF numerically, which is compared with the FRF obtained experimentally. Two mathematical indicators, the Modal Assurance Criteria and Stability Diagram are used to correlate mode shapes and assess the stability of experimentally obtained modes.
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