국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Data Quality Assurance for Supersonic Jet Noise Measurements
저자	Brown, Clifford A.;; Henderson, Brenda S.;; Bridges, James E.
Keyword	AEROACOUSTICS;; AERODYNAMIC NOISE;; EXHAUST GASES;; HIGH SPEED;; JET AIRCRAFT NOISE;; NOISE INTENSITY;; NOISE MEASUREMENT;; NOISE REDUCTION;; PROPULSION;; QUALITY CONTROL;; SUPERSONIC AIRCRAFT;; SUPERSONIC JET FLOW
URL	http://hdl.handle.net/2060/20100039313
보고서번호	NASA/TM-2010-216767
발행년도	2010
출처	NTRS (NASA Technical Report Server)
ABSTRACT	The noise created by a supersonic aircraft is a primary concern in the design of future high-speed planes. The jet noise reduction technologies required on these aircraft will be developed using scale-models mounted to experimental jet rigs designed to simulate the exhaust gases from a full-scale jet engine. The jet noise data collected in these experiments must accurately predict the noise levels produced by the full-scale hardware in order to be a useful development tool. A methodology has been adopted at the NASA Glenn Research Center s Aero-Acoustic Propulsion Laboratory to insure the quality of the supersonic jet noise data acquired from the facility s High Flow Jet Exit Rig so that it can be used to develop future nozzle technologies that reduce supersonic jet noise. The methodology relies on mitigating extraneous noise sources, examining the impact of measurement location on the acoustic results, and investigating the facility independence of the measurements. The methodology is documented here as a basis for validating future improvements and its limitations are noted so that they do not affect the data analysis. Maintaining a high quality jet noise laboratory is an ongoing process. By carefully examining the data produced and continually following this methodology, data quality can be maintained and improved over time.