If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)

Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie

Stress due to Vibration

bradyle · 2012-09-02 10:06:12

Hi, this is probably a very easy question but I'm wondering if anyone can tell me how you calculate stress that occurs due to random vibration. I managed to not study vibrations throughout all of my degree and am now trying to understand the results for the random vibration test I did in ANSYS. Is the force calculated by…

02-09-2012 11:06AM

#1

bradyle

Registered Users, Registered Users 2 Posts: 353 ✭✭

Join Date: April 2008

Posts: 319

Hi, this is probably a very easy question but I'm wondering if anyone can tell me how you calculate stress that occurs due to random vibration.

I managed to not study vibrations throughout all of my degree and am now trying to understand the results for the random vibration test I did in ANSYS.

Is the force calculated by hooke's law and then just the normal equation to find stress?

Any help would be greatly appreciated!
Thanks

0

Comments

#2 03-09-2012 09:49AM

Turbulent Bill

Registered Users, Registered Users 2 Posts: 1,639 ✭✭✭

Join Date: September 2006

Posts: 1527

You can relate the peak or RMS accelerations/displacements to the stress, but to be honest I don't remember the details. There's a fundamental relationship between frequency, displacement etc. - any basic vibration textbook will have this.

I'd also repeat the ANSYS analysis with a fixed-frequency excitation, much easier to relate this to a textbook example than a random one.

0
#3 03-09-2012 01:22PM

brownacid

Registered Users, Registered Users 2 Posts: 484 ✭✭

Join Date: August 2008

Posts: 439

What kind of structure is it?

0