Hello Santhosh, First of all, thanks for the presentation! Just brilliant! I’m currently getting into Ansys Acoustics in more depth to solve some muffler and enclosure problems and this will help a great deal! Btw, is the pdf shared somewhere? Or would you be willing to share it otherwise? Best regards!
I want to calculate the sound absorption coefficient (two microphone impedance test tube), from one side I have applied mass source (1 unit) and on another side, I have to apply radiation boundary condition/Perfectly matched layer. (at inlet only mass source ).
Hi Santhosh, very impressive presentation. The audio has a little bit low volume. It's possible to have a pdf version of the presentation? I need to prepare a ansys acoustic training course in Italian and your presentation is the best one I can find all around the web. Thanks Michele
You already have to have a detailed material model to be able to do that, Delany-Bazley, JCA or similar. If so, then you can set up an impedance tube simulation. Basically, an open-closed tube with the absorber attached to the closed (rigid) end. As for boundary conditions; rigid wall bc on cylindrical surface and radiation boundary at inlet. Probe acoustic pressures at distance x1 and x2 away from the absorber. The absorption coefficient can then be calculated by the following expression: alpha = 1 - |R|^2, where R is the reflection coefficient given by: (H12 - e^(jk(x2-x1)) / e^(jk(x2-x1))* e^(2jk(x2-x1) H12 = P(x1)/P(x2) -> (complex fft’s) What you effectively measure is how large the incident wave is relative to the reflected wave.
Hi, sir, thanks for sharing. For a duct with rigid-rigid end conditions, is the element size smaller the better? I used a smaller element size, but the frequency response and sound pressure were different from the normal elemet size.
@@SanthoshKumar-ge9sq Thanks. I use two different element sizes, but one of them seems to be wrong. I've recorded the video, can you give me some advice? ruclips.net/video/bBhIo8iuqRA/видео.html
Hello Santosh, are the examples in ansys help manual only available in APDL versions? are there workbench version of the same examples. I could not locate them in search.
Hi Santhosh sir... how can I contact you??? I am performing modal and harmonic analysis of a dam structure using an acoustic medium on the upstream face. Need help...
@@SanthoshKumar-ge9sq Thanks for your response sir, your tutorials are really helpful, also can you make one video for complete muffler modelling for sound transmission loss of a muffler with perforation pipe, baffles/ plug type muffler any of one...It would be really very helpful.
@@SanthoshKumar-ge9sq hi, just want to know at what frequency we should calculate the wave number because it is frequency dependent and we need to get the result fupto 1500-2000hz so what would be the correct way of calculating this?
Hello Santhosh,
First of all, thanks for the presentation! Just brilliant! I’m currently getting into Ansys Acoustics in more depth to solve some muffler and enclosure problems and this will help a great deal!
Btw, is the pdf shared somewhere? Or would you be willing to share it otherwise?
Best regards!
I want to calculate the sound absorption coefficient (two microphone impedance test tube), from one side I have applied mass source (1 unit) and on another side, I have to apply radiation boundary condition/Perfectly matched layer. (at inlet only mass source ).
The quality of sound of an acoustic video must be superior
Although thanks for sharing
Hi Santhosh, very impressive presentation. The audio has a little bit low volume. It's possible to have a pdf version of the presentation? I need to prepare a ansys acoustic training course in Italian and your presentation is the best one I can find all around the web. Thanks Michele
Thanks. May I know your background and why r u preparing Ansys Acoustic training course ?
Hello sir can you pls make video on acoustic absorption coefficient calculation for porous absorber using ansys acoustics
You already have to have a detailed material model to be able to do that, Delany-Bazley, JCA or similar. If so, then you can set up an impedance tube simulation. Basically, an open-closed tube with the absorber attached to the closed (rigid) end. As for boundary conditions; rigid wall bc on cylindrical surface and radiation boundary at inlet. Probe acoustic pressures at distance x1 and x2 away from the absorber. The absorption coefficient can then be calculated by the following expression:
alpha = 1 - |R|^2,
where R is the reflection coefficient given by:
(H12 - e^(jk(x2-x1)) / e^(jk(x2-x1))* e^(2jk(x2-x1)
H12 = P(x1)/P(x2) -> (complex fft’s)
What you effectively measure is how large the incident wave is relative to the reflected wave.
Great Job sir...
Hi, sir, thanks for sharing. For a duct with rigid-rigid end conditions, is the element size smaller the better? I used a smaller element size, but the frequency response and sound pressure were different from the normal elemet size.
By making element size small and small, frequency should go more towards analytical value by hand calculation.
@@SanthoshKumar-ge9sq Thanks. I use two different element sizes, but one of them seems to be wrong. I've recorded the video, can you give me some advice?
ruclips.net/video/bBhIo8iuqRA/видео.html
@@xuewenzhang2811 I don't understand what u r trying to do, sorry. Please contact your Ansys support.
I am doing dynamic analysis of concrete dam with reservoir as acoustic medium. can anyone help me with the boundary conditions???
Hello Santosh, are the examples in ansys help manual only available in APDL versions? are there workbench version of the same examples. I could not locate them in search.
Please can you provide workshop tutorials .pdf
Hi Santhosh sir... how can I contact you??? I am performing modal and harmonic analysis of a dam structure using an acoustic medium on the upstream face. Need help...
How to give trim element for perforation
ruclips.net/video/umHEM7dESeU/видео.html
@@SanthoshKumar-ge9sq Thanks for your response sir, your tutorials are really helpful, also can you make one video for complete muffler modelling for sound transmission loss of a muffler with perforation pipe, baffles/ plug type muffler any of one...It would be really very helpful.
@@SanthoshKumar-ge9sq hi, just want to know at what frequency we should calculate the wave number because it is frequency dependent and we need to get the result fupto 1500-2000hz so what would be the correct way of calculating this?
How can I contact with you for a short chat?
Need help sir!!!!!! how can I contact you ??????