Table 2. Maximum error, 1 0.2% 1% N 256 512 1024 2048 4096 256 512 1024 2048 4096 Welch 3,35 4,15 8,59 3,47 3,32 1,28 0,74 0,38 0,18 0,14 RD 1,95 2,78 0,40 0,24 0,35 0,09 0,01 0,07 0,13 0,30 Figure 1. Example of RD functions ( ) XX D and ( ) YX D , in this case the damping 0.2% and 1024 N . Figure 2. Example of estimation of FRF’s, in this case the damping 0.2% and FFT block size 1024 N . 0 200 400 600 800 1000 1200 -0.5 0 0.5 1 1.5 2 Random Decrement functions Dxx 0 200 400 600 800 1000 1200 -0.4 -0.2 0 0.2 0.4 Dyx time lag/dt 0 0.5 1 1.5 2 2.5 10-4 10-2 10 0 10 2 Full band Frequency response estimates. Blue line: Exact. Red full line: FFT. Red dotted line: RD. 0.97 0.975 0.98 0.985 0.99 0.995 1 1.005 1.01 10 1 Around peak 2.05 2.1 2.15 2.2 2.25 2.3 2.35 2.4 2.45 2.5 10-1 Off-peak 501
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