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

Automotive Load Spectrum and excited frequency

  1. Apr 11, 2016 #1
    Hi all!
    I have the following spectrum for a signal force:


    and this is a zoom in the range of interest:


    Can I state that this force is capable of exciting the natural frequency of the structure ( in the range 5-30Hz) or the force amplitude in this range is too low compared to the peak (3298.7N)?
  2. jcsd
  3. Apr 13, 2016 #2
    What is being graphed force and time? A force can excite an objects natural freq if it acts close to that freq as for how much depends on your transfer function, as a forced vibration approaches a natural freq there will be resonance and it will blow up
  4. Apr 13, 2016 #3
    Oh i see the graph better now, no this force would not excite a building's natural freq of 5-30 hz

    You can see even at 5hz you don't even have half a newton so that's about 5 lbs pushing that building compared to like 30000 lbs i would assume that to be negligible unless its a particularly shakey building

    Edit: Whoops i think you didn't mean a building but same thing
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted