Sea Launch User's Guide

5.4 Acoustics
Space average
sound pressure
levels
The launch vehicle internal acoustic levels shown in table 5-3 and figure
5-7 are average sound pressure levels internal to the payload unit. These
values apply to a spacecraft having an equivalent radius that results in a
spacecraft to payload fairing gap of 0.43 m (1.5 ft).
Fill effects to be
considered
The equivalent radius of the spacecraft is defined as the radius of a circle
with a cross-sectional area equal to the spacecraft cross-sectional area.
The envelope of the internal maximum expected sound pressure levels
can also be provided after clocking and fill effects for a specific spacecraft
are determined.
The compliance requirements of the spacecraft to the internal acoustic
environment are given in section 6.
Table 5-3. Acoustics During Flight⎯
1/3-Octave Band Sound Pressure Levels
1/3 octave band center
frequency, Hz
Sound pressure levels, dB
31.5 119
40 121
50 123
63 125
80 127
100 129
125 130
160 131
200 133
250 134
315 133
400 131
500 129
630 127
800 125
1,000 122
1,250 121
1,600 120
2,000 119
2,500 118
3,150 117
4,000 115
5,000 114
6,300 113
8,000 111
10,000 110
• OASPL = 142 dB
• Reference: 2 x 10 -5 Pa (2.9 x 10 -9 psi)
265807J3-048
REV B D688-10009-1 5-7