국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	High-Temperature Modal Survey of a Hot-Structure Control Surface.
저자	Spivey, Natalie D.
Keyword	AERODYNAMIC HEATING;; CARBON-SILICON CARBIDE COMPOSITES;; CONTROL SURFACES;; EXCITATION;; FABRICATION;; FLUTTER ANALYSIS;; FREQUENCY RESPONSE;; HIGH TEMPERATURE;; HOT SURFACES;; LIQUID NITROGEN;; ROOM TEMPERATURE;; VIBRATION TESTS;; WIND TUNNEL TESTS;; X-37 VEHICLE
URL	http://hdl.handle.net/2060/20110023803
보고서번호	NASA/TM-2011-215965
발행년도	2011
출처	NTRS (NASA Technical Report Server)
ABSTRACT	Ground vibration tests are routinely conducted for supporting flutter analysis for subsonic and supersonic vehicles;; however, for hypersonic vehicles, thermoelastic vibration testing techniques are neither well established nor routinely performed. New high-temperature material systems, fabrication technologies and high-temperature sensors expand the opportunities to develop advanced techniques for performing ground vibration tests at elevated temperatures. When high-temperature materials, which increase in stiffness when heated, are incorporated into a hot-structure that contains metallic components that decrease in stiffness when heated, the interaction between those materials can affect the hypersonic flutter analysis. A high-temperature modal survey will expand the research database for hypersonics and improve the understanding of this dual-material interaction. This report discusses the vibration testing of the carbon-silicon carbide Ruddervator Subcomponent Test Article, which is a truncated version of a full-scale hot-structure control surface. Two series of room-temperature modal test configurations were performed in order to define the modal characteristics of the test article during the elevated-temperature modal survey: one with the test article suspended from a bungee cord (free-free) and the second with it mounted on the strongback (fixed boundary). Testing was performed in the NASA Dryden Flight Research Center Flight Loads Laboratory Large Nitrogen Test Chamber.