Statement 7 performing organization names and

Info icon This preview shows page 38. Sign up to view the full content.

View Full Document Right Arrow Icon
DISTRIBUTION/AVAILABILITY STATEMENT 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 4. TITLE AND SUBTITLE 5. FUNDING NUMBERS 6. AUTHOR(S) 1. AGENCY USE ONLY (Leave blank) 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 2. REPORT DATE 3. REPORT TYPE AND DATES COVERED 15. NUMBER OF PAGES 16. PRICE CODE 20. LIMITATION OF ABSTRACT 19. SECURITY CLASSIFICATION OF ABSTRACT 18. SECURITY CLASSIFICATION OF THIS PAGE 17. SECURITY CLASSIFICATION OF REPORT 14. SUBJECT TERMS 13. ABSTRACT (Maximum 200 words) Standard Form 298 (Rev. 2-89) Prescribed by ANSI Std. Z39-18 298-102 NSN 7540-01-280-5500 Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and to the Office of Management and Budget, Paperwork Reduction Project (0704-0188), Washington, DC 20503. 11. SUPPLEMENTARY NOTES Unclassified Unclassified Acoustics, Noise abatement approaches, Differential GPS A-950102 Robert T. N. Chen, William S. Hindson, and Arnold W. Mueller* Ames Research Center Moffett Field, CA 94035-1000 National Aeronautics and Space Administration Washington, DC 20546-0001 505-59-36 38 A03 Point of Contact: Robert T. N. Chen , Ames Research Center, MS 211-2, Moffett Field, CA 94035-1000; (415) 604-5008 *Langley Research Center, Hampton, Virginia. September 1995 Technical Memorandum This paper presents the test design, instrumentation set-up, data acquisition, and the results of an acoustic flight experiment to study how noise due to blade-vortex interaction (BVI) may be alleviated. The flight experiment was conducted using the NASA/Army Rotorcraft Aircrew Systems Concepts Airborne Laboratory (RASCAL) research helicopter. A Local Differential Global Positioning System (LDGPS) was used for precision navigation and cockpit display guidance. A laser-based rotor state measurement system on board the aircraft was used to measure the main rotor tip-path-plane angle-of- attack. Tests were performed at Crows Landing Airfield in northern California with an array of microphones similar to that used in the standard ICAO/FAA noise certification test. The methodology used in the design of a RASCAL-specific, multi-segment, decelerating approach profile for BVI noise abatement is described, and the flight data pertaining to the flight technical errors and the acoustic data for assessing the noise reduction effectiveness are reported. Acoustic Flight Tests of Rotorcraft Noise-Abatement Approaches Using Local Differential GPS Guidance NASA TM-110370 Available from the NASA Center for AeroSpace Information, 800 Elkridge Landing Road, Linthicum Heights, MD 21090; (301) 621-0390 Unclassified-Unlimited Subject Category – 05
Image of page 38
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern