1,724,251 research outputs found
PLENUM CHAMBER EFFECT ON WIND-TUNNEL RESONANCE BY THE FINITE-ELEMENT METHOD
No full textThis research was performed under NASA Grant
NGL-05-020-243. The author wishes to thank Professor Holt
Ashley for his valuable discussions
RESONANCE PREDICTION FOR CLOSED AND OPEN WIND-TUNNEL BY THE FINITE-ELEMENT METHOD
No full textThis research was performed under NASA Grant NGL-05-
020-243. The author wishes to express his appreciation to Professor
H. Ashley for valuable discussions with him
Composite research and development in Korea
No full textThe recent research and development activities of some laboratories working on composite materials in universities (KAIST, Seoul National Univ., Postech, Gyeongsang National Univ.), research institutes (KIMM, KARI), and companies (Hankuk Fiber, DACC) are introduced in this article. Their activities cover a broad range of research and development fields in composite materials: design and fabrication; processing technology; structural analysis; characterization of composite materials; NDE; fiber optic structures; damage detection; health monitoring; smart structures and so on. These technologies will be increasingly used in various fields and the development of these technologies will play an important role in future industries.The author acknowledges the assistance of several university laboratories, the
composite group in KIMM, and the aircraft division of KARI, Hankuk Fiber, and DACC
Viscous effects on the resonance of a slotted wind tunnel using finite elements
No full textModel flutter and oscillatory airload measurements will be affected by coupling with an acoustic vibration mode when the model frequency is near a tunnel resonance frequency. Widmayer, Clevenson, and Leadbetter conducted some experiments to measure the oscillatory aerodynamic forces and moments acting on a rectangular wing. The test results were in considerable error near the tunnel resonant frequency. Therefore, the authors want to predict the wind-tunnel resonant frequency accurately. The authors confine their concern to the wind tunnel that does not have a plenum chamber to simplify the problem, and they discuss the case in which the slot width is very small to consider viscosity effects.This research was performed under NASA Grant NGL-05-
020-243. The author wishes to express his appreciation to
Professor H. Ashley for his valuable discussions
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