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Experimental modal analysis has grown steadily in popularity since the advent of the digital FFT spectrum analyzer in the early 1970’s. Today, impact testing (or bump testing) has become widespread as a fast and economical means of finding the modes of vibration of a machine or structure. In this paper, it presents the experimental and numerical modal analysis of a compressor mounting bracket (CMB). The dynamic behavior of CMB is investigated through impact testing. The three-dimensional finite element models are constructed using Altair HyperMesh and an numerical modal analysis is then performed to generate natural frequencies and mode shapes in the three-orthogonal directions. The finite element model agrees well with the experimental tests and eventually it helps the designer to design upfront with much lesser cost and time of experimentation.

Experimental and Numerical Modal Analysis of a Compressor Mounting Bracket