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UID:0-486@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20160620T163000

DTEND;TZID=Asia/Jerusalem:20160620T173000

DTSTAMP:20230603T191733Z

URL:https://aerospace.technion.ac.il/events/investigation-of-the-autorotat
 ion-of-a-cargo-container/

SUMMARY:Investigation of the Autorotation of a Cargo Container
DESCRIPTION:Lecturer:Kfir Arbel\n Faculty:Department of Aerospace Engineeri
 ng\n Institute:Technion – Israel Institute of Technology\n Location:Clas
 sroom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: \n Abstract: \
 n Details: \n Carriage of external slung loads by helicopters is a common 
 method of transporting large and heavy loads. In many cases slung loads th
 at are connected to the helicopter through a swivel\, tend to develop stea
 dy rotation as a result of the aerodynamic loads that act on them during f
 light. This phenomenon is called autorotation. Previous research has shown
  that autorotation may be very beneficial since in many cases it stabilize
 s the slung load. Without rotation the same load may become unstable\, exh
 ibiting large pendulum vibrations that endanger the helicopter. Wind tunne
 l and flight tests have shown that the autorotation phenomenon depends on 
 the: geometry of the load\, its mass distribution\, the orientation of the
  load relative to the incoming flow\, and other parameters. There is not a
  simple method of predicting the autorotation speed of a body when the abo
 ve parameters are known. Detailed CFD calculations predict the phenomenon\
 , but the differences between the predicted autorotation speed and measure
 d speed are significant in many cases.\nPrevious studies at the Technion s
 howed good agreement between the autorotation speed of actual slung loads 
 during flight tests and small wind tunnel models. In those tests the model
 s were hung from the tunnel ceiling and performed pendulum motions as well
  as autorotaion. The goal of the present research is to study the autorota
 tion of box-like models during wind tunnel tests. During the tests rotatio
 n about a fixed axis is the model sole degree of freedom. The angle of rot
 ation is measured continuously and the angular speed and acceleration are 
 calculated. In addition the forces and moments that act on the model durin
 g autorotation are also measured.\nThe seminar will start with a short rev
 iew of previous research on the autorotation phenomenon. Then the wind tun
 nel test set up and test techniques will be described. Selected results wi
 ll be presented and discussed. These results will include autorotation of 
 different models at different wind tunnel speeds. An effort to describe th
 e phenomenon by a simple empirical formula will also be presented and disc
 ussed. The presentation will end with suggestions for further research.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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TZID:Asia/Jerusalem

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DTSTART:20160325T030000

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