Order tracking with multi-sine excitation on a ground vibration test

Abstract

This paper presents a new method of postprocessing multi-reference sine sweeps using order tracking methods. In combination with conventional multi-reference signal processing using load cells as independent references, this method of postprocessing can be used to extract the equivalent of multi-reference, symmetric sine, and antisymmetric sine sweeps from a single data set. By capturing all of this information in a single run, as opposed to up to seven runs that might be required on a typical six-shaker test, testing time can be dramatically reduced. With this method, a complete set of mode shapes can be more easily extracted from a single data set with a consistent input force level. This provides consistent results for use in model correlation. ©2010 Society for Experimental Mechanics Inc.