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UID:0-366@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20181010T163000

DTEND;TZID=Asia/Jerusalem:20181010T173000

DTSTAMP:20230527T135810Z

URL:https://aerospace.technion.ac.il/events/wind-tunnel-study-of-the-arma-
 flutter/

SUMMARY:Wind-Tunnel Study of the ARMA Flutter Prediction Method
DESCRIPTION:Lecturer:Tzlil Nahom Jidovetski\n Faculty:Department of Aerospa
 ce Engineering\n Institute:Technion – Israel Institute of Technology\n L
 ocation:Classroom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: \n
  Abstract: \n Details: \n Aeroelastic flutter is a destructive instabilit
 y phenomenon for which dedicated flight test campaigns are considered com
 pulsory according to airworthiness regulations. In these tests\, the dynam
 ic characteristics of the aeroelastic system are interpreted from measurem
 ents of the aircraft’s structural responses to external excitations. Ove
 r the years\, several flutter identification and prediction techniques h
 ave been suggested to increase the efficiency of flutter flight tests an
 d to enable better prediction of the flutter boundary. While most of the 
 methods rely on external mechanical excitation accessories\, the Autoregre
 ssive Moving-Average (ARMA) flutter prediction method attempts to identif
 y the aeroelastic system based on the aircraft structural response to rand
 om air turbulence excitation.\nThis study investigates the application asp
 ects and the methodology of flutter prediction via ARMA system identifica
 tion in a dedicated wind-tunnel experiment. For that purpose\, an elastic 
 wing was designed and manufactured using rapid prototyping. The wing was t
 ested at the Technion’s subsonic wind-tunnel at subcritical points and a
 ll the way to flutter.\nThe current study presents the flutter predictio
 n methodology and process as conducted numerically and in two wind tunnel 
 experiments. The structural responses used for ARMA system identification
  are acceleration and strains (measured by strain gauges) in the first wi
 nd-tunnel test\, and strains measured via optical fibers in the second te
 st. The study presents comparison of the flutter prediction capability wh
 en based on discrete\, spars measurement (accelerometers\, strain gauges) 
 versus that from more dense measurement (optical fibers). The study focus
 es on the practical aspects of the application of the method in wind-tunne
 l testing\, which is also of great importance for flight testing.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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DTSTART:20180323T030000

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