International Journal on Advanced Science, Engineering and Information Technology, Vol. 2 (2012) No. 3, pages: 224-226, DOI:10.18517/ijaseit.2.3.191

Elastic Characterization of Glass by Modal Analysis

Abstract

Modal analysis is the study of dynamic characteristic of structures induced by vibrational excitation. Under modal excitation, three important parameters namely natural frequency, damping ratio and mode shape associated with the structural properties are acquired. This paper presents an experimental investigation of glass by experimental modal analysis. The specimen is excited by an impact hammer to perform resonant vibration where the characteristics of the resonance are acquired. One most important characteristic is the natural frequency where it is known that different material having undergone resonant vibration exhibit different specific natural frequencies to it. The natural frequencies are used as the parameters of determining the structural properties of the glass. The modal analysis is done using the LMS instruments and software where Frequency Response Function (FRF) measurement technique is employed in determining the natural frequencies. The structural properties are established based on the obtained natural frequencies and geometries of the materials using the expression from available literature. The results are then compared with the theoretical values for verification.

Keywords:

Modal analysis; Resonant vibration; Natural frequency; Nondestructive testing; FRF measurement; Glass; Young’s modulus

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