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UID:0-360@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20180822T163000

DTEND;TZID=Asia/Jerusalem:20180822T173000

DTSTAMP:20230527T135618Z

URL:https://aerospace.technion.ac.il/events/dynamic-response-of-an-elastic
 -aircraft-to-store-ejection/

SUMMARY:Dynamic Response of an Elastic Aircraft to Store Ejection
DESCRIPTION:Lecturer:Daniel Kariv\n Faculty:Department of Aerospace Enginee
 ring\n Institute:Technion – Israel Institute of Technology\n Location:Cl
 assroom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: \n Abstract:
  \n Details: \n Military aircraft typically carry under-wing stores such a
 s bombs or external fuel tanks. During a mission\, one or more stores may 
 be ejected with the aid of a jettison force that pushes them away from th
 e aircraft into a safe trajectory.  Store release changes the load balanc
 e on the aircraft\, causing both static and dynamic structural response o
 f the flexible wings\, as well as a rigid body motion of the whole aircraf
 t. The large ejection forces might result in excessive structural dynamic
  loads that must be accounted for in the structural design process. The pr
 oblem of ejection loads is becoming more severe for modern\, flexible air
 craft configurations (typically\, unmanned aircraft vehicles)\, in which s
 mall stores are ejected with large jettison forces. Additionally\, stores 
 are sometimes released in ripple\, namely shortly one after another\, bef
 ore the dynamic response from the previous ejection has decayed completely
 .\n\nThe study presents a frequency-domain method for computing the struct
 ural dynamic response of an elastic aircraft to store ejection\, accountin
 g for the jettison\, the inertial\, and the unsteady aerodynamic forces. 
  A novel solution method is proposed\, that accounts for the time-variati
 on of structural properties of the configuration (following each store re
 lease) in the frequency domain. The study examines the physical factors th
 at affect the aircraft response to store ejection. The study also present
 s cases of ripple ejection and shows how the time-interval between ejectio
 ns could be optimized to reduce the loads. The methodology is demonstrate
 d on a test case of a subsonic elastic generic unmanned aircraft vehicle c
 arrying up to six stores on each wing.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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DTSTART:20180323T030000

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