Automotive Load Spectrum and excited frequency

AI Thread Summary
The discussion centers on whether a given force spectrum can excite the natural frequency of a structure within the 5-30 Hz range. It is concluded that the force amplitude in this range is too low compared to the peak force of 3298.7 N, making it unlikely to excite the structure's natural frequency. Even at 5 Hz, the force is less than half a Newton, which is negligible compared to the expected structural loads. The conversation emphasizes that resonance occurs when the force approaches the natural frequency, but in this case, it does not. Overall, the force is deemed insufficient to cause significant excitation of the structure's natural frequency.
Gp7417
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Hi all!
I have the following spectrum for a signal force:

1.jpg


and this is a zoom in the range of interest:

2.jpg


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)?
 
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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
 
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
 

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