The Support Of An Aircraft For Ground Resonance Tests

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The Support of an Aircraft for Ground Resonance Tests: A ...

    https://www.emerald.com/insight/content/doi/10.1108/eb032976/full/html
    The current trend in ground resonance testing is aimed at providing aircraft modes of vibration appropriate to the free‐free condition. To achieve this objective the rigid body frequencies of the aircraft on its supports must be low by comparison with the frequency of any mode of distortion. A minimum frequency ratio of 1:3 is specified.Cited by: 8

Air Bags as Flexible ‘Supports in Ground Resonance Testing ...

    http://naca.central.cranfield.ac.uk/reports/arc/cp/0032.pdf
    In designing a flexible support for ground resonance tests it is shov,n that a sufficiently close estimate of air bag frequency can be obtained from the fonnula:- f, -$ 1 +sJ where f v = vertical frequency in c.p.s. PA = atmospheric pressure Ap = excess air pressure in bag above atmospheric

Ground Vibration Testing and Flutter Analysis

    https://community.sw.siemens.com/s/article/ground-vibration-testing-and-flutter-analysis
    Sep 18, 2019 · If the models and test results agree, the aircraft is cleared for the next round of tests, which usually includes ground runs and a flight flutter investigation. Flutter is an in-flight phenomenon which causes the wings and other key components to vibrate uncontrollably, due to the convergence of multiple modes as the resonance and damping shift due to aero-elastic loading, making flight …

Ground Vibration and RAP Testing For Aircraft & Spacecraft ...

    https://www.simutechgroup.com/testing-services/ground-vibration-and-rap-testing
    Ground vibration testing (GVT) and Resonance Assessment Profile (RAP) testing are modal test techniques specifically focused on aircraft and spacecraft. The natural frequencies, mode shapes and damping ratios obtained from these tests provide critical information for flight safety assessments including flutter and structural dynamics.

How Things Work: Ground Resonance Flight Today Air ...

    https://www.airspacemag.com/flight-today/how-things-work-ground-resonance-94660854/
    The cyclic control in the cockpit flails about so violently that the pilot cannot hold it, the rotor blades strike the tail boom or the cockpit, parts begin falling off, and moments later the helicopter may be a heap of scrap. If ground resonance begins, the pilot’s best option is to get the helicopter into the air.Author: Peter Garrison

Modern solutions for Ground Vibration Testing of large ...

    http://www.irisa.fr/sisthem/flite/ARTICLES/LMS/2008_IMAC_GVT.pdf
    Modern solutions for Ground Vibration Testing of large aircraft Bart Peeters (1) , Héctor Climent (2) , Raul de Diego (2) , Jesús de Alba (2) , Javier Rodriguez Ahlquist (2) , José Martinez Carreño (2) , Wim Hendricx (1) , Alain Rega (1) ,

Helicopter Self Destructs Due To Ground Resonance - YouTube

    https://www.youtube.com/watch?v=IN2Bw79KK80
    Apr 26, 2018 · On June 2, 2012, about 1135 mountain daylight time, a Schweizer 269C helicopter, N2196F, entered ground resonance when it set down on …

Watch These CH-47 Chinooks Get Thrashed During Testing

    https://foxtrotalpha.jalopnik.com/watch-these-ch-47-chinooks-get-thrashed-during-testing-1763925820
    Watch These CH-47 Chinooks Get Thrashed During Testing. Just like the automobile industry, destructive testing is the dark side of aircraft development. The fact is airframes have to be tested to their breaking point in order to ensure that they can withstand daily operational abuse in all types of …

Ground resonance - Wikipedia

    https://en.wikipedia.org/wiki/Ground_resonance
    Ground resonance is an imbalance in the rotation of a helicopter rotor when the blades become bunched up on one side of their rotational plane and cause an oscillation in phase with the frequency of the rocking of the helicopter on its landing gear.

Ground Resonance - Side View - YouTube

    https://www.youtube.com/watch?v=RihcJR0zvfM
    Feb 27, 2006 · ch-47 ground test. wow !!! turbine explosion rc aw-139 big scale model turbine helicopter flight demo and hard landing - duration: 5:58. rc media world 2,923,974 views



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