Display operating deflection shapes from nonstationary data

In this article, a new methodology is presented for post-processing nonstationary operating data as a prerequisite for displaying operating deflection shapes on a 3D spatial model of a test machine or structure. The traditional 'transmissibility' measurement, which is a measure of each response normalized by a reference response, is discussed. Then, two new post-processing methods associated with two new types of measurements (the ODS FRF and the ODS Order Track) are introduced and their use is illustrated with data typical of realistic testing situations.