Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Landing Gear reliability testing.

  1. Jun 27, 2008 #1
    Hello,

    I was wondering what kind of reliability tests I could do with landing gears. The one we are working with, is a conventional, trail dragger. Right now, we are building a model and later on the full size.

    But we are focusing on reliability and I'd like to know good methods so that I can test it with the scale model and compare it and probably use the same for the big model too.

    I was thinking about running a Finite Element Analysis in some CAD program, but is there any real world stuff that I could do other than simulation. The model we are building right now is a 9 pound plane.

    Thank You,

    vishnu
     
  2. jcsd
  3. Jun 27, 2008 #2
    Someone???? Please.

    Is my question vague? Do I have to be more specific here?
     
  4. Jun 28, 2008 #3
    I don't actually know how it is done, but I saw an episode on discovery showing the testing of main landing gears. It was an obvious drop down test for the bogie(with some force i guess). And for the wheels, the wheels were dropped(not dropped actually, but lowered), on some rolls to test the wheels.

    Of course, you can make separate parts and check for the stresses knowing the forces(you can calculate forces i guess, a rough idea atleast, simple mechanics!!)

    One question I need to ask. We know that impact loading makes the induced stress twice of the value obtained in gradual loading(or any other factor, maybe 3 times the stress for gradual loading). So am I safe enough in simulating a static structural problem with twice the stress rather than going for dynamic analysis??
     
  5. Jun 29, 2008 #4

    brewnog

    User Avatar
    Science Advisor
    Gold Member

    Carry out a design FMEA, then have a look at the failure modes needing some test work.
     
  6. Jun 29, 2008 #5

    FredGarvin

    User Avatar
    Science Advisor

    You mean act like an engineer? Huh. Who'd a thunk it?

    You will also need to look into applicable Federal standards in whatever part of the world you are in that govern flight safety and aircraft certification.
     
  7. Jun 30, 2008 #6

    brewnog

    User Avatar
    Science Advisor
    Gold Member

    Yep, I've been fully institutionalised. Does it show?
     
  8. Jun 30, 2008 #7

    FredGarvin

    User Avatar
    Science Advisor

    Oh yeah. You have been assimilated. Welcome to the collective.
     
  9. Nov 29, 2009 #8
    I use aluminum spring main gear on my taildragger. Max weight at 1650 lbs...For lighter projects, design your own, do some drop testing.
     
  10. Nov 30, 2009 #9

    Danger

    User Avatar
    Gold Member

    Is this gear retractable? If so, there are a lot more potential failure points that you need to address.
    I took your term 'conventional' to mean fixed, but one mustn't assume.
     
  11. Nov 30, 2009 #10
    It is fixed. In aviation, conventional gear usually means opposite of tricycle....
     
  12. Dec 1, 2009 #11

    Danger

    User Avatar
    Gold Member

    Actually, I was a pilot many moons ago. (Hence my signature. :biggrin:) A lot of taildraggers have retractable mains, though, which is why I asked for clarification.
     
  13. Dec 2, 2009 #12
    No kidding? I have flown quite a lot over 22 years but only in a few models... and I have seen only one taildragger that had retractable mains....that was a 182RG. What are the other models?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Landing Gear reliability testing.
  1. Worm Gear/ Spur Gear (Replies: 1)

  2. Landing Gear (Replies: 1)

  3. Planetary Gears (Replies: 2)

Loading...