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Chinook ground resonance - side

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Uploaded by on Jul 21, 2006

A ground resonance test gone wrong...

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  • Its not a pass fail test. Its an investigation type of test, experimental almost ...except its more putting theory to practise... some things you have to test to destruction for mechanics of solids type things ( I do engineering!) Sometimes they do this with materials with torsion and tensile tests! Sometimes structures such as pipes are subject to pressure too. AND we also do stuff to test how many cycles to failure. and this is kinda like that.. and to find modes of failure. :) helpful i hope!

  • doesn't matter...this was a test for GR:

    Ground resonance, in fully articulated multi-bladed helicopters, is a hazardous condition during touchdown or at other times when the helicopter is running while sitting on the ground. A series of shocks to the landing gear can pass through to the rotor disk and cause an imbalance in the rotor system. Under extreme conditions, the imbalance causes violent oscillations that quickly build and result in catastrophic damage of the entire airframe.

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  • Gone wrong? I'd say it went as expected. I wish that they had done this to 10 46/47's with full instrument and monitoring packages so we could see the data.

  • expensive!!

  • lol what happened?

  • @gkwas Oh ok, thanks for the info.

  • later they checked underneath *MADE IN CHINA* = epic fail

  • @kandem360 thats true also an imbalance rotor amplifies this theory

  • with this idea, according to tesla, you can take down a bridge with a hammer if you know the exact frequency of energy.

  • forced vibrations has the same frequency as self vibrations. so machine absorbs the power of forced vibrations instead of dissipating them

  • What is that caused by? I am stunned.

  • Holy crap that's violent. So what forces cause something like that?>

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