【90】导入ACTRAN计算的结构振动响应无法计算辐射噪声？
Q：为什么导入ACTRAN计算的结构振动响应无法计算辐射噪声？A：First of all, when a BC Mesh is used and results are applied to a surface mesh, it's recommended to input a tolerance value that is adequate to the model. One can try first moderate or even big tolerances like 0.1 for instance.
As a matter of fact, in the model you sent, a tolerance of 0.001 was specified and that seemed to be inadequate in that case. Using the projection manager in ActranVI, I found the right gap tolerance (0.1) and I raised this parameter to 0.1 in order to get a good coupling.
Another issue was the cause behind the FATAL messages during computations:
An nff database may contain many PIDs.
In Actran 11.1 or 11.2, when an nff database is used to apply excitation quantities like displacement or any other type of quantities over a BC Mesh , the code searches for these excitation quantities inside every PID in the nff database.
If the quantities aren't available, the computation stops. This can be solved by removing the PIDs that don't contain the quantities for the BC Mesh.
Please find the modified cross map "corss_map_modified.nff" inside the directory "From FFT" in your folder on the FTP server.
Please note that this problem is fixed in Actran 12 and I was able to run proper computations using your initial cross_map.nff and a gap tolerance of 0.1.
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