×
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

resonant frequency ?

resonant frequency ?

resonant frequency ?

(OP)
The resonant frequency of helmoltz resonator, f = c/2*3.14 (A/VL)^.5 Where A is surface area & V is the cavity volme & L is the effective length.

My question is does it make a difference for Transmission loss/tuning of the system if use circular, or any other cross section like square with circular end for the connecting pipe of helmoltz by keeping same surface area?

As per above formula I don't see it but appreciate if someone have different experience.

RE: resonant frequency ?

You might need a correction for A if you go to some crazy shape that causes lots of drag, and the end correction for L will not be the standard figure either.

But it will still work, just at adifferent frequency.

Square vs circular probably would make no difference that is measurable.

Cheers

Greg Locock

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

RE: resonant frequency ?

That formula that you're using was derived from differential equations assuming a circular cross-section throat and a circular cross-section cavity having I believe a length the same order of magnitude as the diameter.  When you stray very far from those simplifying assumptions,  as Greg said some correction will be required,  but it will still function.
Just assume that testing will be required to validate the design before you go into production!

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