Anyone can help me?

[zjliang]

Anyone can help me find the frequecy formula for a spherical shell? Actually, it's just like a ball, supported by a skirt.

I can do a rough calc for the beam mode frequecy but not shell mode. Since there is no software and reference book, so need your help.

Thanks in advance,

 

[tomirvine]

Refer to the following book:

Robert Blevins, Formulas for Natural Frequency and Mode Shape.

Tom Irvine

http://www.vibrationdata.com

 

[PulseMaster]

One acronym, three letters, FEA.

It is becoming easier and cheaper to do a quick modal analysis of simple geometry like you are talking about. Although, if your geometry in question is a simple sphere, Blevins may help you.

 

[GregLocock]

It is. But an uncorrelated FEA model is a waste of time, mostly. That's why real FEA analysts (as opposed to node pushers) have a copy of Roark, and Blevins, on their desks.

Cheers

Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.