국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Focused and Steady-State Characteristics of Shaped Sonic Boom Signatures: Prediction and Analysis
저자	Maglieri, Domenic J.;; Bobbitt, Percy J.;; Massey, Steven J.;; Plotkin, Kenneth J.;; Kandil, Osama A.;; Zheng, Xudong
Keyword	AMPLIFICATION;; ASYMMETRY;; SHAPES;; SIGNATURES;; SONIC BOOMS;; SUPERSONIC AIRCRAFT;; SUPERSONIC SPEED;; TRANSITION FLIGHT;; TRANSONIC SPEED;; WAVEFORMS
URL	http://hdl.handle.net/2060/20110012700
보고서번호	NASA/CR-2011-217156
발행년도	2011
출처	NTRS (NASA Technical Report Server)
ABSTRACT	The objective of this study is to examine the effect of flight, at off-design conditions, on the propagated sonic boom pressure signatures of a small "low-boom" supersonic aircraft. The amplification, or focusing, of the low magnitude "shaped" signatures produced by maneuvers such as the accelerations from transonic to supersonic speeds, climbs, turns, pull-up and pushovers is the concern. To analyze these effects, new and/or improved theoretical tools have been developed, in addition to the use of existing methodology. Several shaped signatures are considered in the application of these tools to the study of selected maneuvers and off-design conditions. The results of these applications are reported in this paper as well as the details of the new analytical tools. Finally, the magnitude of the focused boom problem for "low boom" supersonic aircraft designs has been more accurately quantified and potential "mitigations" suggested. In general, "shaped boom" signatures, designed for cruise flight, such as asymmetric and symmetric flat-top and initial-shock ramp waveforms retain their basic shape during transition flight. Complex and asymmetric and symmetric initial shock ramp waveforms provide lower magnitude focus boom levels than N-waves or asymmetric and symmetric flat-top signatures.