Transcription of EXPERIMENTAL MODAL ANALYSIS - maintenance.org
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EXPERIMENTAL MODAL ANALYSIS - maintenance.org
CSI Reliability Week, Orlando, FL October, 1999 Page 1 of 12 EXPERIMENTAL MODAL ANALYSIS By Brian J. Schwarz & Mark H. Richardson Vibrant Technology, Inc. Jamestown, California 95327 ABSTRACT EXPERIMENTAL MODAL ANALYSIS has grown steadily in popu-larity 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, we review all of the main topics associated with EXPERIMENTAL MODAL ANALYSIS (or MODAL testing), in-cluding making FRF measurements with a FFT analyzer, MODAL excitation techniques, and MODAL parameter estima-tion from a set of FRFs (curve fitting). INTRODUCTION Modes are used as a simple and efficient means of character-izing resonant vibration.
Experimental modal analysis has grown steadily in popu-larity 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.
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