Tuning fork modal analyis using FEA

http://video_demos.colostate.edu/

Modal analysis of a vibrating tuning fork using finite element analysis (FEA) software.

More engineering and physics-related video demonstrations can be found here:

http://video_demos.colostate.edu/

Category:

Sports

Tags:

• tuning
• fork
• vibration
• physics
• frequency
• harmonics
• mode
• shape
• modal
• analysis
• FEA

[Aresholewins]

The fundamental mode should be tune A 440Hz

[DrDaveBilliards]

@Aresholewins

The tuning fork we used was C523.3 (an octave above middle C).

[rasmasyean]

@ 01:35 is the fork moving slightly back and forth along its long axis? Why doesn't your finger dampen that?

[DrDaveBilliards]

@rasmasyean

There is slight vibration along the long axis due to centrifugal force from the rotating tines. The fingers do damp this motion, but not very fast because the amplitude is so small.

[jashalen]

Excellent and informative video.  Thank for doing this.

[DrDaveBilliards]

Thank you ... and you're welcome.

[lerlo]

Hi, when we strike the tuning fork, we hear the first mode right?

So how do we excite the structure to get the the subsequent modes?

[eamonnmcstravick]

Great Stuff Dave, I carried out an analysis with very similar results using NX I-DEAS....

[DrDaveBilliards]

Pro-Mechanica was used. Whatever FEA program you are using should come with help screens and tutorials to help you get started.

[Chillysum]

Hallo Dr. Dave:

It's amazing in your video! I'm a beginner and i wonder what FEA software exactly do you use? Which fundamental subjects do i need in order to simulate the vibration models of a tuning fork? Thanks a lot!