37 Next-Generation Random Vibration Tests 405 0 10−5 100 10−5 10−5 100 100 10−2 10−4 10−6 100 10−2 10−4 10−6 10−2 10−4 10−6 100 10−2 10−4 10−6 100 10−2 10−4 10−6 10−8 100 100 10−2 10−4 10−6 10−8 100 10−2 10−4 10−6 10−8 100 10−2 10−4 10−6 10−8 10−0 10−2 10−4 10−6 100 500 1000 Wind Tunnel PSD 1X Twin Shaker PSD 1X Wind Tunnel PSD 1Y Twin Shaker PSD 1Y Wind Tunnel PSD 3Y Twin Shaker PSD 3Y Wind Tunnel PSD 5Y Twin Shaker PSD 5Y Wind Tunnel PSD 2Y Twin Shaker PSD 2Y Wind Tunnel PSD 4Y Twin Shaker PSD 4Y Wind Tunnel PSD 6Y Twin Shaker PSD 6Y Wind Tunnel PSD 1Z Twin Shaker PSD 1Z Wind Tunnel PSD 3Z Twin Shaker PSD 3Z Wind Tunnel PSD 5Z Twin Shaker PSD 5Z Wind Tunnel PSD 2Z Twin Shaker PSD 2Z Wind Tunnel PSD 4Z Twin Shaker PSD 4Z Frequency (Hz) Acceleration PSD (g2/Hz) Acceleration PSD (g2/Hz) Acceleration PSD (g2/Hz) Acceleration PSD (g2/Hz) Acceleration PSD (g2/Hz) Acceleration PSD (g2/Hz) Acceleration PSD (g2/Hz) Acceleration PSD (g2/Hz) Acceleration PSD (g2/Hz) Acceleration PSD (g2/Hz) Acceleration PSD (g2/Hz) Acceleration PSD (g2/Hz) 1500 2000 0 500 1000 Frequency (Hz) 1500 2000 0 500 1000 Frequency (Hz) 1500 2000 0 500 1000 Frequency (Hz) 1500 2000 0 500 1000 Frequency (Hz) 1500 2000 0 500 1000 Frequency (Hz) 1500 2000 0 500 1000 Frequency (Hz) 1500 2000 0 500 1000 Frequency (Hz) 1500 2000 0 500 1000 Frequency (Hz) 1500 2000 0 500 1000 Frequency (Hz) 1500 2000 0 500 1000 Frequency (Hz) 1500 2000 0 500 1000 Frequency (Hz) 1500 2000 Control Position Control Position Overtest Undertest Cross-Axis Overtest Fig. 37.13 PSD response plots from twin-shaker test (Z-axis excitation)
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