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D9
标准号：
AIR1672
标准名称： Practical Methods to Obtain Free-Field Sound Pressure Levels from Acoustical Measurements Over Ground Surfaces
同源图形
PROBABILITY DISTRIBU
EMPIRICAL REFLECTION
ILLUSTRATION OF EFF
COMPARISON OF SPECTR
EXAMPLE OF APPLICATI
EXAMPLE OF SPECTRUM
BOEING ENGINE TEST S
FIGURE B2. BOEING EN
FIGURE B3. SCHEMATIC
MICROPHONE LOCATIONS
G R O U N D A N D P
EFFECT OF E L E V A
Cl P ratt & W h i t
C2 G e o m e t r y o
C3 T y p i c a l Jet
C 4 Spec t r a M e a
C 5 Axial Jet N o i
C 6 S p e c t r a M
C7 Specific N o r m
C 8 C o m p a r i s
Dl
D 2
D3
D3 (C o nt . )
D4
D 5
D6
D 7
D7 (Cont.)
D8
D10
D 11
D12