Vnoise算例-Advanced Muffler Tutorial

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Index
Index..................................................................................................................2
Introduction ........................................................................................................3
Modelling considerations ......................................................................................3
TL Evaluation.......................................................................................................6
Overall procedure .................................................................................................6
Step 1: Model Import .............................................................................................7
Step 2: Intersections ...............................................................................................7
Step 3: Surface disconnection ................................................................................11
Step 5: Double wall ...............................................................................................15
Step 6: Inlet and Outlet...........................................................................................17
TL Calculation.......................................................................................................18
Pseudo Discretization ............................................................................................21
Symmetry .............................................................................................................22
Analysis.................................................................................................................23
TL Results ............................................................................................................24
Alternative procedure for TL evaluation...................................................................27
Sound radiated by the outlet.....................................................................................31
Coupled Analyses...................................................................................................36
Basic concepts ......................................................................................................36
Flexibility effect on TL ...........................................................................................38
Flexibility effect on external radiation ......................................................................44
Fully coupled approaches........................................................................................46
Fully coupled approach (Mixed Domain) .................................................................46
Introduction to Multi Domain ..................................................................................49
Fully coupled approach (Multi Domain)....................................................................51
Internal analysis with Multi Domains .......................................................................57
Flexibility effects on external radiation .....................................................................58
APPENDIX A ......................................................................................................64
Domain and Surface Types ....................................................................................64
Internal and External Surfaces ................................................................................64
Thin Shells..............................................................................................................64
Surfaces and calculation domain...............................................................................65
APPENDIX B........................................................................................................66
Mixed domain and multi Domain Comparison............................................................66

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