Orbital Minotaur VI - Manual (Page 52)

Minotaur IV • V • VI User’s Guide Section 4.0 – Payload Environment
4.2.1. Random Vibration
Payload random vibration is produced from two sources. The first is structural born from the launch
vehicle produced from motor burn and acoustics acting on the launch vehicle. This tends to be, low
frequency, less than 250 Hz, and can be simulated using a base driven test. The second source is from
acoustics acting on the spacecraft. This tends to be high frequency, greater than 250 Hz, and is not easily
simulated using a base driven test. The response at the LV/SV interface is strongly dependent on the
unique spacecraft dynamics, including its response to the acoustic field. Therefore, structural born
random vibration environments are only defined up to 250 Hz and are shown in Figure 4.2.1-1.
Figure 4.2.1-1. Minotaur IV Family Payload Random Vibration Environment
Orbital recommends that the payload be subject to acoustic testing per Section 4.3, which will envelope
the high frequency (>250 Hz) structural born random vibration, and that the payload be designed/qualified
to meet the CLA results which envelope the low frequency (<250 Hz) structural born random vibration.
4.2.2. Sine Vibration
There are only two sources of sine vibration excitation on the Minotaur vehicle and they are defined at the
LV/SV interface as shown in Figures 4.2.2-1 and 4.2.2-2.
Release 2.0 June 2013 37