402 P.M. Daborn et al. 0 10−6 10−7 10−4 10−5 10−2 10−3 10−1 500 1000 Wind tunnel fan harmonics Frequency (Hz) Acceleration Speotral Density (g2/Hz) 1500 PSD 2Z PSD 5Z |CSD| 5Z/2Z 2000 Fig. 37.9 Test specification used in the twin-shaker vibration test 0 10−6 10−4 10−5 10−3 10−2 10−1 500 1000 Frequency (Hz) Acceleration PSD (g2/Hz) 10−6 10−7 10−4 10−5 10−3 10−2 10−1 Acceleration |CSD| (g2/Hz) 1500 Wind Tunnel PSD 2Z Twin Shaker PSD 2Z Wind Tunnel |CSD| 5Z/2Z Twin Shaker |CSD| 5Z/2Z Wind Tunnel CSD 5Z/2Z Twin Shaker CSD 5Z/2Z 2000 Frequency (Hz) 0 500 1000 1500 2000 −100 100 −200 200 300 0 Frequency (Hz) Acceleration CSD Phase (degrees) 0 500 1000 1500 2000 0 10−6 10−4 10−5 10−3 10−2 10−1 500 1000 Frequency (Hz) Acceleration PSD (g2/Hz) 1500 Wind Tunnel PSD 5Z Twin Shaker PSD 5Z 2000 a b c d Fig. 37.10 MIMO random control curves from twin-shaker test. (a) PSD2Z. (b) PSD5Z. (c) jCSDj 5Z/2Z. (d) Phase (CSD) 5Z/2Z
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