Published Paper Details:

Abstract: In order to understand structural dynamics of failed structures in real time, the modal and harmonic analysis are used to obtain the dynamic characteristics of structures. Impulse modal analysis technique is an experimental technique used to derive the modal model of a linear time-invariant vibratory system. The theoretical basis of the technique is establishing a relationship between the vibration response at one location and excitation at the same or another location as a function of excitation frequency. This relation is known as frequency response function (FRF). A frequency response function (FRF) captures the unique dynamic characteristics of the structure between two degrees of freedom (DOFs); the response DOF and the excitation DOF. The frequency response functions (FRFs) of structures are obtained as output results by applying the system input artificially through some type of exciter, i.e. either impact hammer or magnetic shaker (Richardson et al., 1990, 1993). An impact test generally results in measuring one of the rows of the frequency response function matrix whereas the shaker test generally results in measuring one of the columns of the frequency response function matrix. In this research work a methodology Impulse modal analysis technique (IMAT) is discussed to determine the modal parameter i.e. natural frequencies of structures. A case study of cantilever beam analyzed with vibration analyzer OROS to determine its natural frequencies through Impulse modal analysis technique.