{"id":382547,"date":"2024-09-12T20:16:18","date_gmt":"2024-09-12T20:16:18","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/acoustic-response-from-random-vibration-analysis\/"},"modified":"2024-09-13T06:18:15","modified_gmt":"2024-09-13T06:18:15","slug":"acoustic-response-from-random-vibration-analysis","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/acoustic-response-from-random-vibration-analysis\/","title":{"rendered":"Acoustic Response from Random Vibration Analysis"},"content":{"rendered":"<p>&lt;p&gt;Hi all,&lt;\/p&gt;&lt;p&gt;I am trying to do an acoustic analysis in Mechanical APDL that is based on a modal simulation that feeds the random vibration analysis of a Shell281 panel with a Fluid220 acoustic environment. I am trying to retrieve a sound pressure level (dB) Vs. frequency (Hz) response, where the panel is being excitated by an input PSD spectrum. I have managed to obtain good results for the response PSD of the panel, but cannot find a way to extend a similar analysis for the acoustic response of the Fluid220 environment. I have gone through all of the material in the <a href=\"SEA%20analysis%20in%20the%20cabin%20of%20a%20regional%20turboprop%20with%20metamaterial%20lining%20panels\">acoustic analysis guide<\/a> and tried all the relevant examples. In the acoustic guide, section 10.1.4 provides the conditions and limitations for performing an acoustic analysis using a spectrum input and gives the example of water sloshing in a cylindrical tank based on an SPRS excitation, suggesting to me what I am looking for can be done. However, in chapter 12 of the acoustic guide, only modal, harmonic, and transient models have postprocessing options. Further, when I run my simulation with and without my spectrum analysis code, I get the same results when I use commands like PRNSOL and PRVAR, confirming the acoustic data are being populated by my modal analysis.&nbsp;&lt;\/p&gt;&lt;p&gt;Essentially, I want to know if it is possible to get frequency-based acoustic results from the combination of a modal and random vibration analysis.&lt;\/p&gt;&lt;p&gt;Thanks,&lt;\/p&gt;&lt;p&gt;Noah&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-382547","topic","type-topic","status-closed","hentry","topic-tag-acousticmodal-1","topic-tag-apdl","topic-tag-random-vibration"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi all,I am trying to do an acoustic analysis in Mechanical APDL that is based on a modal simulation that feeds the random vibration analysis of a Shell281 panel with a Fluid220 acoustic environment. 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