1. 17-Sept-041 Amplitude vs frequency for LRM vibration tests based on GR-63-CORE Jonathan King IEEE802.3aq Channel model ad hoc Task 2: Time-varying study & modal noise

2. 17-Sept-042 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/f 2 amplitude vs frequency characteristic

3. 17-Sept-043 GR-63-CORE amplitude vs frequency Sinusoid y(t)=A.sin( .t); Acceleration, a(t) = d 2 y(t)/dt 2 = -(A.(  2 ).sin( .t) i.e. A max = -a max /(  2 ) 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)