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UID:0-308@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20191002T163000

DTEND;TZID=Asia/Jerusalem:20191002T173000

DTSTAMP:20230527T131617Z

URL:https://aerospace.technion.ac.il/events/study-of-the-durability-of-aer
 onautical-structures-under-extreme-accelerations/

SUMMARY:Study of the Durability of Aeronautical Structures under Extreme Ac
 celerations
DESCRIPTION:Lecturer:\n Faculty:\n Institute:\n Location:\n Zoom: \n Abstra
 ct: \n Details: \n Elbit Systems Inc. is developing an autonomous drone fo
 r long range missions. In order to save time and to use electrical batteri
 es having short time power supply\, this drone is designed to be launched 
 to its remote operation zone inside a 120 mm mortar shell. During the laun
 ch the pressure in the mortar barrel creates on the shell an acceleration 
 pulse with a peak of about 10\,000 g within about 3 milliseconds. This wor
 k examines the durability of the designed drone having the extreme launch 
 acceleration.\nThis work includes three steps. First\, the original design
  of Elbit was analyzed and approved to meet the geometrical and functional
  conditions while keeping its rigidity. Then\, based on this updated desig
 n and its CAD model\, a FEA model was built\, using the ANSYS Workbench so
 ftware package with the Explicit Dynamics (Autodyn) solver. In the second 
 step the FEA model was calibrated and verified using drop tests results. T
 he drop tests were performed with a dummy mortar shell having an equivalen
 t FEA model and equipped with two accelerometers. A fast video camera was 
 also used for redundancy and for measuring the impact velocities in the dr
 op tests. Those velocities were used as inputs for the ANSYS simulations\,
  and their acceleration results were compared to the accelerometers readin
 gs for the calibration of the numerical FEA model. Finally\, the calibrate
 d FEA ANSYS model was used to simulate the drone structure response to the
  forces acting on the mortar shell during its launch. The launch simulatio
 n results showed that most of the drone structure withstand the extreme ac
 celeration conditions during its launch inside the mortar shell. However\,
  the magnets of the selected COTS (Commercial Off-The-Shelf) propeller mot
 ors\, do not withstand these conditions and therefore these motors must be
  chanced or redesigned. In addition\, based on the FEA results\, it is rec
 ommended to strengthen some parts in the current design.
CATEGORIES:Seminars

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DTSTART:20190329T030000

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