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# Re: Resonance

• To: seaint(--nospam--at)seaint.org
• Subject: Re: Resonance
• From: desi j kiss <djkiss55(--nospam--at)juno.com>
• Date: Wed, 6 Nov 2002 06:49:27 -0800

```Rainier,

When the excitation is oscilatory, the system is forced to vibrate at the
excitation
frequency.     If your frequency of oscilation coincides with one of the
NATURAL
frequency of the system a condition of resonance is encountered. (i.e. it
takes place
under the excitation of external forces or forced vibration.

Hope this helps,

Desi J. Kiss, MS,PE
http://djkeng.tripod.com/

On Wed, 6 Nov 2002 09:36:49 EST RainCat1(--nospam--at)aol.com writes:
> Say I have a structure supporting a machinery. I did a modal analysis
> and
> determine that the natural frequencies (in cps) of the structure are
> as
> follows: mode 1 = 3, mode 2 = 5, mode 3 = 10. The rated frequency of
> the
> machinery = 5. The machinery has up & down vibration which is more
> similar
> with mode 1 than mode 2.
> Should I expect resonance problem? I'll appreciate any input.
> Thanks & regards!
>
> Rainier Catubig
> San Diego, California
>
>
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