声疲劳仿真计算实例-virtual.lab版.pdfVIP

声疲劳仿真计算实例 Acoustic fatigue By Li Zenggang Mobile: Email: forengineer@126.com Step 1 Import the structure and acoustics meshes  Start-Acoustics-Acoustic Harmonic BEM  File-Import. First select nastran input file structure.bdf file, the units are MKS.  File-Import. First select nastran input file acoustics.bdf file, the units are MKS.  File-Import. First select nastran result file fine_mesh.op2 file, the units are MKS. Please check on the mesh and mode set. Step 2 Define the mesh part type  Tools- Set mesh parts type Step 3 Solve the number conflicts  Tools-Nodes and Elements ID - Renumber Nodes and Elements Id. First select the structure mesh and renumber the mesh from 10000. Second select the acoustics mesh and renumber the mesh from 20000.  Tools-Nodes and Elements ID -Check ID Conficts. Press check button and you can find there are no conflicts. Step 4 Carry out the acoustic preprocessing  Insert-Acoustic mesh preprocessing set. Double click the Grid Support in the tree and the select the acoustic mesh. Right click on the Acoustic Mesh Preprocessing Set and select Update. Step 5 Define the material and property  Insert- Materials-New Materials -New fluid Material. Accept the default value. Change the Name to air.  Insert -Properties-New Properties - New acoustic fluid property. Select the acoustic mesh and the fluid material from tree. Step 6 Transfer the modes  Insert - Other analysis cases - Data Transfer analysis case. Select the Mode Set.1 from tree.  Double click the Source Set and the select the fine_mesh from the tree. Double click the Target Set and select the structure mesh. Double click the Mapping Data and input 4 for the Number of Nodes and 6mm for the Maximm Distance. Click the Compute and OK button.  Right click the Data Transfer Solution Set and select Update. Step 7 Define the random diffuse field