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1D acoustic two port
Posted 1 feb 2017, 02:27 GMT-5 Acoustics & Vibrations Version 5.1 1 Reply
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Hi,
I would like to implement a two port coupling in an acoustic 1D frequency domain simulation. That is, I would like to couple two unconnected domains at the points P1 and P2, with the transfer matrix
[p1;u1] = [T11,T12;T21,T22]*[p2;u2]
where [p1,u1] and [p2,u2] are the pressure and normal particle velocity at P1 and P2 respectively.
I'm sure there is a simple way to do this but so far i haven't figured it out.
I'm using v5.1
Kind regards
Liam
I would like to implement a two port coupling in an acoustic 1D frequency domain simulation. That is, I would like to couple two unconnected domains at the points P1 and P2, with the transfer matrix
[p1;u1] = [T11,T12;T21,T22]*[p2;u2]
where [p1,u1] and [p2,u2] are the pressure and normal particle velocity at P1 and P2 respectively.
I'm sure there is a simple way to do this but so far i haven't figured it out.
I'm using v5.1
Kind regards
Liam
1 Reply Last Post 1 feb 2017, 19:16 GMT-5
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Posted:
8 years ago
In case anybody has the same problem here is the solution that I found to work.
define p1 and p2 using Integration Component Coupling at point P1 and P2 of acoustic pressure p, (dependant variable)
define u1 and u2 using the boundary ODE physics, and following ODE equations,
p1 - (T11*p2+T12*u2) (=0) [1]
p2 - (u1-T22*u2)/T21) (=0) [2]
with 'Velocity field (m/s)' as dependant variable and 'Pressure (Pa)' as 'Source term quantity'
In the 1D acoustics domain define 'Inward accelleration' boundary conditions
"an=j*omega*(+u1)" at P1
"an=j*omega*(-u2)" at P2
I found that this gives the expected results.
Kind regards
define p1 and p2 using Integration Component Coupling at point P1 and P2 of acoustic pressure p, (dependant variable)
define u1 and u2 using the boundary ODE physics, and following ODE equations,
p1 - (T11*p2+T12*u2) (=0) [1]
p2 - (u1-T22*u2)/T21) (=0) [2]
with 'Velocity field (m/s)' as dependant variable and 'Pressure (Pa)' as 'Source term quantity'
In the 1D acoustics domain define 'Inward accelleration' boundary conditions
"an=j*omega*(+u1)" at P1
"an=j*omega*(-u2)" at P2
I found that this gives the expected results.
Kind regards