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CONTENTS
Page
10.1
Studies on Minimizing Visible Emissions ...............
45
10.2
Model-Scale Test Conclusions ..........................
45
11.1
Introduction ..........................................
46
11.1.1
Enclosure Interior Noise Sources ......................
46
11.2
Enclosure Interior Noise in Full-Scale Test Facilities
46
11.3
Typical Interior Noise Level Spectra ..................
46
11.4
Enclosure Interior Studies Utilizing Scale Models .....
56
12.1
Introduction ..........................................
60
12.2
Principal Paths of Noise Radiation ....................
60
12.2.1
Path 1 ................................................
60
12.2.2
Path 2 ................................................
60
12.2.3
Path 3 ................................................
60
12.2.4
Path 4 ................................................
61
12.2.5
Path 5 ................................................
61
12.2.6
Path 6 ................................................
61
12.2.7
Source Receiver Paths .................................
61
12.2.8
Effect of Geometry Change on Noise ....................
62
12.3
External Noise of Full-Scale Test Facilities ..........
62
12.4
External Noise Studies Utilizing Scale Models .........
62
TABLES
1
List of Symbols ................................................
2
2
Aircraft Engine Data ...........................................
8
3
Aircraft and Enclosure Geometry Data ...........................
9
4
Hush-House and Test Cell Geometrical Information ...............
11
5
Basic Checkout Data with Aligned Aircraft ......................
18
6
Open Air Jet Opacities .........................................
45
7
Summary of Far-Field and Interior Noise Levels
of Full-Scale Test Facilities ................................
47
8
Objectives and Key Acoustic Results of Model Studies ...........
51
9
Location of Standard Microphone Positions for
Measuring Interior Noise .....................................
55
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