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Acoustic Analysis with Optistruct - radiated sound using infinite elements

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I am trying to run an example, provided by altair on their help page, about vibroacoustic interaction and wave propagation using infinite elements CACINF3. The link to the page is:



However, I am unable to run the problem using optistruct 2017.

The error message given is:



The model file follows attached.




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I do not have access to the latest solver patch. I am using OptiStruct 2017.2.

However, the model was supossed to run with this solver. The link I have provided is from the 2017 help page.

Am I missing something?

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Shared file runs fine with OptiStruct 2017.2.4 patch. I also see in the resolved issue list of OptiStruct 2017.2.3 which takes about Infinite element. PFA screenshot for same.

infinite element.JPG

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