I am currently modelling the sound propogation inside an acoustic domain of a car. The excitation is provided by an incident wave loading point at the front end of the car, near the dashboard. This incident wave is defined by a specifc amplitude and frequency input (150 Hz).
Now as per ABAQUS:
When one uses a direct steady state dynamic analysis, it is usually in response to a linear respone of vibration of a system in the frequency domain where abaqus carries out a frequency sweep from a starting frequency till an ending frequency. When I carry out this analysis from a range of 50Hz to 200 Hz, I get peaks in pressure only at the eigen values and not near my 150Hz applied frequency.
Now, when one use a Generel non-linear dynamics step in the time domain to model the same vibration, I get my frequency peaks at 150 Hz and no other frequencies within my defined range. I then get some peaks at value much greater than 200Hz but for now, I am focusing on my interval.
Why do I get such different respones in both analysis, when everything remains the same?
You have to consider the modal analysis run first by extracting atleast 0 to 2000Hz Frequencies and then apply the real time load either from the engine in the form of force or pressure and solve the case using harmonic analysis and then take the solved model in harmonic acoustic analysis for your reference steps can be worked out in a way --- Modal analysis -- Harmonic analysis -- Harmonic acoustic analysis in each of the cases results have to be dumped in to the next module then only you can extract the real time sound pressure level results.
In fact I have already done one such analysis, work is under review in one of the reputed journal as such I get the comments will forward you the case.
@Arun Patil Thank you for your comprehensive answer. I shall look into this but I am still confused about what you mean when Harmonic acoustic results must be dumped into the next module? What is the next module?
Thank you once again for the helpful answer
The sequence which I have shown you in the keyword form. For example to extract the harmonic analysis we need modal analysis results as a prerequisites and for harmonic acoustic analysis the simple harmonic analysis results. This is how I carried out in ANSYS Workbench..
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