1.

Technical Paper
Technical Paper
1. A unique ducted fan test bed for active noise control and aeroacoustics research
Heidelberg, Laurence J. ; Hall, David G. ; Bridges, James E. ; Nallasamy, M.
Pub. info.: AIAA paper.  pp.1-23,  1996.  American Institute of Aeronautics and Astronautics
Title of ser.: AIAA Paper : AIAA/CEAS Aeroacoustics Conference
Ser. no.: 1996
2.

Technical Paper
Technical Paper
2. Cruise Noise Measurements of a Scale a Model Advanced Ducted Propulsor
Dittmar, James H. ; Hughes, Christopher E. ; Bock, Lawrence A. ; Hall, David G.
Pub. info.: NASA Technical Reports.  (NASA-TM-105806),  pp.1-12,  1993.  National Aeronautics and Space Adminstration
3.

Technical Paper
Technical Paper
3. A Sophisticated, Multi-Channel Data Acquisition and Processing System for High Frequency Noise Research
Hall, David G. ; Bridges, James
Pub. info.: NASA Technical Reports.  (NASA-CR-189137),  pp.1-8,  1992.  National Aeronautics and Space Adminstration
4.

Technical Paper
Technical Paper
4. The Effect of Swirl Recovery Vanes on the Cruise Noise of an Advanced Propeller
Dittmar, James H. ; Hall, David G.
Pub. info.: NASA Technical Reports.  (NASA-TM-103625),  pp.1-18,  1990.  National Aeronautics and Space Adminstration
5.

Technical Paper
Technical Paper
5. Detailed Noise Measurements on the SR-7A Propeller: Tone Behavior With Helical Tip Mach Number
Dittmar, James H. ; Hall, David G.
Pub. info.: NASA Technical Reports.  (NASA-TM-105206),  pp.1-31,  1991.  National Aeronautics and Space Adminstration
6.

Technical Paper
Technical Paper
6. FAR-FIELD NOISE AND INTERNAL MODES FROM A DUCTED PROPELLER AT SIMULATED AIRCRAFT TAKEOFF CONDITIONS
Woodward, Richard P. ; Heidelberg, Laurance J. ; Hall, David G.
Pub. info.: NASA Technical Reports.  (NASA-TM-105369),  pp.1-17,  1992.  National Aeronautics and Space Adminstration
7.

Technical Paper
Technical Paper
7. Noise Measurements From an Ejector Suppressor Nozzle in The NASA Lewis 9- by 15-Foot Low Speed Wind Tunnel
Krelsa, Eugene A. ; Cooper, Beth A. ; Hall, David G.
Pub. info.: NASA Technical Reports.  (NASA-TM-103628),  pp.1-62,  1990.  National Aeronautics and Space Adminstration
8.

Technical Paper
Technical Paper
8. Noise Levels From a Model Turbofan Engine With Simulated Noise Control Measures Applied
Hall, David G. ; WWoodward, Richard P.
Pub. info.: NASA Technical Reports.  (NASA-TM-106318),  pp.1-15,  1993.  National Aeronautics and Space Adminstration