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Hello. I have created an acoustic structural model and provided them tie constraint at the interface. My acoustic field is a sphere where the solid is at the center where the solid shape is cut out from the fluid field. The fluid I am using is air. If I don't give air structural damping values...

Hello. I am running modal analysis on ABAQUS on a disk with damping materials on it but I keep getting modes that are 0.01 Hz frequency apart. Can anyone tell me what can be changed in the modal analysis step so that it ignores such modes and takes larger steps? Here are the modal step and the...

"Nodal output variable POR (pressure magnitude) is available for an acoustic medium in ABAQUS (in ABAQUS/CAE this output variable is called PAC). When the scattered wave formulation is used with incident wave loading in ABAQUS/Explicit, output variable POR represents only the scattered pressure...

@GredLocock, my analysis is a steel disc in an air domain and I am plotting the acoustic pressure in the air domain duing the steady state modal analysis from different observation points. I am not sure if it is the RMS pressure at each frequency point. I am just using the POR values mentioned...

Hello. I am doing an analysis of sound propagation from a solid disc when a periodic load is applied ro it. i got the pressure values for different ferquencies with the Steady state Modal analysis but some of the pressure peaks are negative. What do t hese negative pressures mean? Are they...

Hello. I am trying to simulate sound pessure levels in air with acoustic structural analysis. I get pressure values from steady state Modal analysis. But when i apply a skin to the plate the pressure values don't get damped. I want to reduce the sound produced and am using a skin with shell...

Around 350 dB is what it translates to. And my sphere has a radius of 1m. But I still think that it is too high. Its louder than Jet engines (140 dB at 100ft). What could have possibly have gone wrong here?

If it is gauge pressure then are these values feasible? These are a result of steady state dynamics(Modal) operation.

I used all units in SI.

Hello I performed acoustic-structural analysis in ABAQUS/Standard and received Output POR and Displacement. I know that the POR valuse gives me the fluid pressure but is it the absolute pressure or gauge pressure? I am having trouble interpreting my results since the POR mmagnitude I got were in...

Ohh. I have been trying to couple a solid air domain to the solid domain. I didn't make a cavity for the solid. Where is the color code option?

If i select surface of the air domain does it take the outer surface or the surfaces of the nodes? If it does how will it couple with the surface of the solid domain since the solid is within the air?

So, should i use surface to surface or surface to node region constraints?

I have used same msh size for both the solid and fluid domain. I use the fluid domain as master since it is larger and I read somewhere that if we are solving for POR then the fluid should be master.

I changed the mesh size according to the wavelength and these are the errors I get.

@FEAway, I have tried increasing the tolerance and the adjustments are enabled but still the same.

Hello Everyone. I am new to ABAQUS. I have some previous experience in Ansys Structural FEA. I am trying to perform acoustic-structural analysis to find sound proapgation in air. I looked it up in the manual and followed the instructions but the results with the TIE constraints were not what I...