Amplitude vs frequency for LRM vibration tests based on GR-63-CORE

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Amplitude vs frequency for LRM vibration tests
based on GR-63-CORE

• Jonathan King

IEEE802.3aq Channel model ad hocTask 2
Time-varying study modal noise
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Summary of GR-63-CORE operational tests

• Effects of office vibration are simulated by a
  swept sine wave, with tests in 3 orthogonal axes
• Frequency range and acceleration are defined
• for frame mounted equipment
• 0.1g from 5 to 100Hz, test in each of 3
  orthogonal axes
• for electronic sub assemblies
• 1g from 5 to 100Hz, test in each of 3 orthogonal
  axes
• Note constant acceleration definition leads to a
  1/f2 amplitude vs frequency characteristic

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GR-63-CORE amplitude vs frequency

• Sinusoid y(t)A.sin(w.t) Acceleration, a(t)
  d2y(t)/dt2 -(A.(w2).sin(w.t)
• i.e. Amax -amax/(w2)

notes p-p amplitude is 2.A At 1Hz, 0.1g, the
p-p amplitude is 2 inches, similar to the
TI/EIA-455-203 shaker At 2Hz, 1g, amplitude is
5 inches p-p , similar to vigorous manual
shaking of a fibre coil At 10Hz, 1g, amplitude
is 5mm p-p At 20Hz, and amplitude of 5mm p-p,
the acceleration is 4g (4 times the GR-63-CORE
office vibration spec)