-50 -40 -30 -20 -10 0 10 20 30 40 50 dB (m/s2)/N HBcc - Reference HBcc - Mobility/Impedance 0 64 128 192 256 320 384 448 512 -180 -90 0 90 180 Phase o Hz Figure 19. System AB-TR Estimation of Beam B Drive Point FRF at DOF 6 using Synthesized Test FRF. -30 -20 -10 0 10 20 30 40 50 dB (m/s2)/N HBcc - Reference HBcc - Mobility/Impedance 0 64 128 192 256 320 384 448 512 -180 -90 0 90 180 Phase o Hz Figure 20. System AB-TT Estimation of Beam B Drive Point FRF at DOF 6 using Synthesized Test FRF. Including either a single or both internal DOF on system AB-TR did not improve the results. However, including both internal DOF on system AB-TT significantly improves the results using the Mobility approach. Figure 21 and Figure 22 display the resulting FRF at DOF 6 and DOF 28, respectively. Discrepancies are still present in damping and antiresonance regions; however, the peaks are fairly accurate in amplitude and frequency. -50 -40 -30 -20 -10 0 10 20 30 40 50 dB (m/s2)/N HBcc - Reference HBcc - Mobility HBcc - Impedance 0 64 128 192 256 320 384 448 512 -180 -90 0 90 180 Phase o Hz Figure 21. System AB-TT Estimation of Beam B Drive Point FRF at DOF 6 using Synthesized FRF with Internal DOF 1 and 15. -40 -30 -20 -10 0 10 20 30 40 50 dB (m/s2)/N HBcc - Reference HBcc - Mobility HBcc - Impedance 0 64 128 192 256 320 384 448 512 -180 -90 0 90 180 Phase o Hz Figure 22. System AB-TT Estimation of Beam B Drive Point FRF at DOF 28 using Synthesized FRF with Internal DOF 1 and 15. 183
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