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Recent content by GregLocock

  1. GregLocock

    Reduce sound transmission through air duct

    Vortex collapse is thee main mechanism that generates the turbulent flow noise. It might be possible to find a less noisy blower, but typically we concentrate on flow straightening prior to the blower.
  2. GregLocock

    Sheet metal Spring, Force to Compress To a smaller Diameter

    @rothers was that a non linear contact analysis? Please could you plot the contact force?
  3. GregLocock

    Forum Clutter - Students (and others) posting in this forum

    There is an ignore function. Click on their username in their post et voila. Also the gnomes behind the scenes will move threads to Student if you report them.
  4. GregLocock

    Truss

    By eye that is going to end up on the ground pretty damn quick. At the least could you complete your east to west shear system by adding two cross braces on the west, and two columns and two cross braces on the north?
  5. GregLocock

    Truss

    You need to draw an FBD and post it here
  6. GregLocock

    Reduce sound transmission through air duct

    Yes that’s pink noise, typical collapse of vortex turbulent flow noise.
  7. GregLocock

    Sheet metal Spring, Force to Compress To a smaller Diameter

    Late edit to my proposal list that the optimised defection at each theta should be at least 0.2mm. I think the point I missed is that the deflection of a beam is not circular so trying to bend a circular Plate to fit a Circular hole wil result. N non smooth shear lads. I hate iPad osk.
  8. GregLocock

    Sheet metal Spring, Force to Compress To a smaller Diameter

    Here’s how I think you solve it properly assuming no friction and symmetry about what I’ve called the 45 degree line. Apply a force pair at 45+/-theta. They are radial and of unit force. Calculate the reaction at 45 and the deflection at every point. Build up that matrix of deflections,assign a...
  9. GregLocock

    Sheet metal Spring, Force to Compress To a smaller Diameter

    While I wait for the carrier pigeon to deliver Stress_eng’s file I predict 3 points of contact at-90,45 and. +180 degrees, roughly, where 0 is up. That puzzles me, I thought rollpins were better than that
  10. GregLocock

    Sheet metal Spring, Force to Compress To a smaller Diameter

    So imagine a radial , distributed , load on the green bit. The change in curvature is uniform along the beam so it is tempting to jump to the useful beam equation M/I=E/R. The only unknown is M, the derivative of that is the shear force which is the load in the first sentence. I doubt it is...
  11. GregLocock

    California high speed rail

    Or you an look at total enrgy by source, coalwas still going up as of 2024 but due to GDP I suspect it'll drop this year
  12. GregLocock

    FEA results interpretation

    Um, while playing with cartoon generators is all fun and games, have you actually done any structures classes? do you know how a bending moment is reacted in a beam? If the material is ductile it may bend, permanently, or break, if it is brittle it'll break. Your little riblet things are all...
  13. GregLocock

    Reduce sound transmission through air duct

    I’m guessing that a labyrinth of semi porous material would be the best bet,but that might create flow noise in its own right.
  14. GregLocock

    Reduce sound transmission through air duct

    Use a spectrum analyser on your phone to get an idea of what frequencies you are objecting to. Or at least is it a hum (single frequency) or a roar (I suspect the latter).
  15. GregLocock

    Things are Starting to Heat Up - Part XIV

    Yet 4000 km south of that we have a drought. It’s almost as if weather is different in different places.
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