Membrane Impedance

[xianer]

hallo all,

I'm working with calculating the acoustic impedance of a rectangular/square membrane, i.e. Za = acoustic_pressure/volume_velocity. I have been searching the relevant equations, but so far unseccessfully. If you have the formulae on hand or any book to be recommended, kindly give me a clue.

A lot of thanks in advance.

Xianer

 

[GregLocock]

Well, the two best google hits were

http://www.mne.psu.edu/lamancusa/me458/9_trans.pdf

as a general overview

and

http://links.jstor.org/sici?sici=0080-4630(19820809)382:1783<245:TAREOR>2.0.CO;2-V

for the exact answers.

Wallace also analysed them, I don't know what the paper was called.

Cheers

Greg Locock

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

 

[xianer]

Hallo Greg Locock,

thanks a lot for your reply. It's a pity there is no the recommended book in my library.

Actually I'm looking for some formulae on membrane, which are expected to directly relate displacement and tension/stress. A reference equation for circular membrane is found in theory of electroacoustics by Josef Merhaut, but the expectant formulae for rectangular membrane is unfortunately not available in my references.

Thanks again.

Xianer