Subject: Re: Structural Dynamics Author: Christopher Wright Date: 2008-10-15 17:18:28 On Oct 15, 2008, at 9:12 AM, wrote:
> I have got a request to work on Operational Shock for a Packaging > Equipment
First, find yourself a good textbook on dynamics and the use of shock spectra. These are 2 of my favorites 1. _Vibration Problems in Engineering_, S.P. Timoshenko and Young 2. _Structural Dynamics for the Practising Engineer_, H.M. Irvine This will get you started.
When you've gone through the applicable chapters, starting with the basics, do no fewer than 6 of the directly applicable example problems first by hand and then with ANSYS and make sure you can get the right answers and that you understand what ANSYS is showing you. **Do not** simply find yourself a macro or a tutorial somewhere and run it. You need experience trouble shooting and interpreting other people's results. Running an example problem and proclaiming yourself knowledgeable is like borrowing a stethoscope and proclaiming yourself a doctor.
Finally, code up your problem and do a static run subject to a constant acceleration equal to the maximum stated base acceleration times the dynamic amplification. Validate your results to make sure your model is appropriate and then run it dynamically. You'll need to know the difference between the statically applied response and the dynamic response, because someone, who may or may not know the difference, is going to ask, and you'll look pretty stupid if you don't know.
Somewhere along the way read 'How to Ask Questions the Smart Way.' Do it sooner rather than later. We're generally laid back here on XANSYS, but I understand there are a few old shellbacks who will cheerfully put a rocket right straight up your kilt for asking questions before doing your homework, and especially for attempting to get others to do your work for you. But I don't know a lot about such people.
Christopher Wright P.E. |"They couldn't hit an elephant at chrisw_at_skypoint.com | this distance" (last words of Gen. .......................................| John Sedgwick, Spotsylvania 1864) http://www.skypoint.com/members/chrisw/