Application of the Subsonic Doublet Lattice Method to Delta Wings

Autor:	Louw H. van Zyl
Rok vydání:	1999
Předmět:	Acceleration Materials science Classical mechanics Delta wing Drop (liquid) Aerospace Engineering Dynamic pressure Pitching moment Mechanics Drop test Pressure sensor Test data
Zdroj:	Journal of Aircraft. 36:609-611
ISSN:	1533-3868 0021-8669
DOI:	10.2514/2.2480
Popis:	cylindricalbagswere not used for dissipatingthe impact energy, but instead were used for combining the two cube bags. Shear pin-type vents were applied to release gas to avoid rebounding at ground impact. The vent area was calculatedwith the method presentedby Idomir.2 Theparametersof the circular-shapedbagweredetermined by the same procedure. A photoelectron-quick-release and cable-suspensionsystemsuitable for an indoor test was used. With this equipment, the verticaland horizontal-velocitycomponentscould be obtained.Accelerometers were glued near the model’s c.g. to measure the vertical and horizontal acceleration. To monitor the dynamic pressure during impact, a pressure sensor was installed in the airbag. Test data were recorded on the oscillometer and processed by a computer. In the case of vertical drops in various initial yaw or/and roll conditions,it is shown that themulticompartmentairbagcan provide better attenuation. A slight tipover occurs only under the poorest test conditions, 19-deg roll and 16-deg yaw. When the horizontal velocitycomponentis in a given range.(
Databáze:	OpenAIRE
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