13 The Integrated Modal Test-Analysis Process (2020 Challenges) 145 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 10 15 20 25 30 Hz File: WireNonR...MI/MO: Navg=9, DF=0,488, MI/SD Cumulative Coherence Due to Force Due to Force + U3Z3 Due to Force + U3Z3+V3Z+|V3Z| Cumulative Coherence 35 40 45 50 Fig. 13.25 Hypothesized Nonlinear System Cumulative Coherence Fig. 13.26 ISS P5 MI/MO FRF and Cumulative Coherence Plots 13.7.1 Preliminary Experimental Modal Analysis (ISPE Modal Test, 2016) Experimental FRF displays associated with drive point 1 provided below in Fig. 13.27. The above FRF function is displayed in a variety of formats, which offer insight into experimental modal content. Specifically, the upper window displays FRF magnitude vs. frequency, the lower left window displays FRF magnitude and
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