Aircraft Propeller Induced Structure-borne Noise, Volume 4255

Front Cover
National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1989 - Airframes - 102 pages
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Contents

INTRODUCTION
1
INSTALLATION EFFECTS EVALUATION
10
INFLIGHT STRUCTUREBORNE NOISE DETECTION
22
PROPELLER SOURCE SIMULATION
28
Versus Spherical Bearings EngineNacelle Installed 6364
63
Typical Panel Damping Treatment
76
InFlight Simulation Test Apparatus
87
InFlight StructureBorne Noise Detection Transducer Layout
88
Correlation of Overall Spatial Average StructureBorne Noise Transmission Dual Shaker Excitation
92
Noise Transmission Single Shaker Excitation
93
Noise Transmission All Sensors Dual Shaker Excitation
94
Noise Transmission All Sensors Single Shaker Excitation
95
Dual Shaker Control Instrumentation
96
StructureBorne Noise Transmission Propeller Excitation Wing Station 64
98
Force Required Single Shaker Excitation Wing Station 70
99
Force Required Dual Shaker Excitation Wing Stations 58 70
100

Predicted vs Measured StructureBorne Noise Wing Front Spar Lateral Response
89
Improved StructureBorne Noise Detection Procedures Test Setup
90
Correlation of Microphone Mean Error with Sound Pressure Level and Standard Deviation
91
StructureBorne Noise Control Effectiveness Tuned Mechanical Damper Microphone 6
101
Damper Microphone 7
102

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