×
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

Bednar/Freese Vibration

Bednar/Freese Vibration

Bednar/Freese Vibration

(OP)
I have been working through the wind vibration example in Bednar Pressure Vessel Design Handbook.
He mentions Rayleigh's method, I was refreshing myself on this when I came across a post here suggesting to read CE Freese's paper "Vibrations of Vertical Pressure Vessels".

I have not read every word of the paper, but he states Eq 6 as T= 2*PI * (SumWy^2/(g*SumWy)).
Bednar uses the same equation except there is a square root around the (SumWy^2/(g*SumWy)) part.
Later in the paper Freese gives a simplified version of this formula with the "g" taken out and divided into the "2PI" term.
In this instance Freese has the square root, and the constant only really makes sense if you assume the (1/g) was in a square root.


So my question is was it just a typo when he states Eq6 the first time without the square root?

thanks

RE: Bednar/Freese Vibration

My vibrations text book would agree with Bednar, I believe. It actually gives the equation as omega-squared = whatever, and it's possible that an exponent was left off the left hand side or the square root was left off the right hand side. Also check units to confirm.

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