×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Preliminary Vibration Loads Analysis

Preliminary Vibration Loads Analysis

Preliminary Vibration Loads Analysis

(OP)
Hello! Can I use the miles equation to predict the loads to a small part of an instrument (large natural frequency, 1000 Hz) Are loads of 200g-300g normal? What about the Q-factor, what is a good estimate?

RE: Preliminary Vibration Loads Analysis

Regarding a WWII 5" HVAR unguided rocket
fired from aircraft the
official G loading was
1,570g's, it weighed 111.3 lbs,
What sort of vehicle
are we talking about ?

RE: Preliminary Vibration Loads Analysis

I posted a similar question (about the amplification factor) in another area of this forum.

I found on some articles that the factor Q should be assumed equal to 10 (that means a critical damping ratio equal to 5%) but i couldn't find any good explanation of why this number could well estimate the real amplification factor.

What's the wight of your structure?
How is the PSD Input?

Did you use just one natural frequency in the estimation?
If you use just one the result could be too conservative.
 Bye

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources