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UID:0-409@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20170925T163000

DTEND;TZID=Asia/Jerusalem:20170925T173000

DTSTAMP:20230530T180446Z

URL:https://aerospace.technion.ac.il/events/comparison-of-laboratory-testi
 ng-techniques-for-replicating-in-flight-dynamic-loads/

SUMMARY:Comparison of Laboratory Testing Techniques for Replicating In-Flig
 ht Dynamic Loads
DESCRIPTION:Lecturer:Kobi J. Cohen\n Faculty:Department of Aerospace Engine
 ering\n Institute:Technion – Israel Institute of Technology\n Location:C
 lassroom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: \n Abstract
 : \n Details: \n Modern weapon systems used on high-performance aircraft h
 ave complex electronic assemblies\, optical components and sensitive mecha
 nisms that are required to survive and operate in a challenging dynamic en
 vironment throughout their complete life cycle. The design of these compon
 ents depends on knowledge of the environmental loads acting on the weapon 
 system during operational conditions. These include aircraft noise induced
  by engines\, gunfire\, etc.\, mechanical loads induced by aircraft struct
 ural response to flight conditions (transferred to the system through the 
 pylons)\, and aerodynamic noise induced by turbulent boundary layer and sh
 ock-boundary layer interaction. The latter is considered to be the most si
 gnificant source of the in-flight vibratory environment. Aerodynamic noise
  is expressed as pressure fluctuations in a broadband spectrum (typically 
 up to 10kHz). These loads cause the system to vibrate in a broad spectrum.
 \nThe development of weapon systems involves extensive laboratory testing\
 , designed to substantiate the durability of the hardware in flight-like e
 nvironmental loads. Various types of laboratory tests are used as experime
 ntal simulations of in-flight loads\, from direct mechanical vibration tes
 ts through acoustic tests in reverberant chambers\, or progressive wave tu
 bes. The question of interest is which testing method\, in terms of bounda
 ry conditions and excitation type (mechanical or acoustic)\, is most adequ
 ate to accurately simulate the response of components to flight loads.\nTo
  answer that question\, a weapon system was tested in mechanical vibration
  test as well as in acoustic test\, in an attempt to replicate the system
 ’s acceleration response that was measured in captive flight. In the mec
 hanical vibration test the system was excited by electro-dynamic shakers\,
  whereas in the acoustic test\, the excitation was done by loud speakers i
 n a reverberant chamber. The responses from each test were studied for the
 ir frequency content\, and compared to the responses measured in captive f
 light. The seminar will present the tests setups\, results\, the effect of
  boundary conditions\, and will conclude on the suitability of each test f
 or studying in-flight loads.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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DTSTART:20170324T030000

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