Orbital Pegasus - Manual (Page 26)

Release 7.0 Apr 2010 15
Pegasus User’s Guide
envelope that encompasses all phases of a
Pegasus launch operation including OCA takeoff,
captive carry, and powered flight.
A +3 dB factor should be added to this spectrum
for 75 seconds in each axis for payload standard
vibration testing to account for fatigue duration
effects to encompass at least two launch attempts
and powered flight.
4.5. Sinusoidal Vibration
The Pegasus launch vehicle has no significant
sustained sinusoidal vibration environments during
captive carry or powered flight.
4.6. Payload Shock Environment
The maximum expected shock response spectrum
at the base of the payload from all launch vehicle events is shown in Figure 4-8. The flight limit
levels are derived from ground stage and payload
separation test data assuming a 38” Orbital-
supplied separation system.
4.7. Payload Acoustic Environment
The maximum expected acoustic levels within the
payload fairing are shown in Figure 4-9. Acoustic
data recorded during previous Pegasus missions
Figure 4-1. Factors of Safety for Payload Design and Test
Figure 4-2. Payload Testing Requirements