Learning Forum

[t.nojiri.fu]

Hello,

I have a question about sound pressure analysis using animal skulls. I am trying to simulate how sound from the ground propagates inside an animal skull (snake) using harmonic acoustics in ANSYS Mechanical, as follows: 

1) I have created a rectangular solid that completely encloses the skull in SpaceClaim, set the material to “air”, and created an air domain.

2) Next, I assigned the material properties of dermal bone and endochondral bone to the skull, and set the density, sound velocity, Young's modulus, and Poisson's ratio according to the characteristics of each bone.

3) I carried out meshing for each of these, and set the analysis settings, acoustic region, physics region, pressure, and mass source as shown in the following image.

Analysis Settings

Acoustic Region (I selected the rectangular solid that I created as the air domain for the geometry).

 

Physics Region (I selected the entire skull as the geometry for the analysis target.)

 

Pressure (For the geometry, I selected the base of the rectangular box that I created as an air domain, assuming that the sound would be transmitted from the ground.)

 

Mass Source (Similarly, I selected the base of the rectangular box that I created as an air domain, assuming that the sound would be transmitted from the ground.)

As a result, the sound pressure distribution in the air domain was displayed gradually, but the sound pressure distribution on the skull, which is the most important part, became homogeneous as shown in the following image.

I think there is probably an oversight in the settings around the skull (perhaps in the settings for the boundary between the air and the skull), but I cannot come up with the idea to solve them. If anyone knows the cause or solution, I would like to learn from you.

[Ashish Khemka]

Hello,

Can you select only the skull and then plot the results?

Regards,

Ashish Khemka