Longitudinal Components

[fabri3]

Hello, i'm Fabrizio and i'm in my first year of my sound engineer career.
I'm currently doing a work on "Percepcion of longitudinal components in piano strings vibrations".
I still can't figure out what "longitudinal components" are, the only results i got on the internet were those linked with the original article.
I would like to know if someone has a clear idea of the concept of "longitudinal components" or if anybody knows about a PDF document or a link in which it's better explained. I just need a few words about this so as to briefly explain the concept to those students beginning with acoustics.
Are "longitudinal components","longitudinal vibrations", "longitudinal signal" or "longitudinal wave" the same?

Here's the link of the article:

http://scitation.aip.org/getpdf/ser...280000030EL117000001&idtype=cvips&bypassSSO=1

Thanks,
Fabri

 

[rob768]

As I read the article, longitudinal components are vibrations (alternating stretching and compression) in the longitudinal direction of the strings. You could call this an axial vibration, and it is a relavant type of vibration, for instance in propeller shafts.
I wasn't aware the play a part in sound.

 

[SomptingGuy]

The article assumes that the reader already understands the term. I agree with rob768, but I'm not surprised that they play a part.

In the field of duct (e.g. automotive intake & exhaust) acoustics, we know that longitudinal (i.e. plane waves) are only valid up to a certain frequency, where lateral modes start to cut in. Same basic idea, just the inverse problem.

- Steve

 

[MikeyP]

The following useful resource has some valuable links

http://www.lmgtfy.com/?q=piano+string+longitudinal+modes

M

--
Dr Michael F Platten