Table of Contents
1. Introduction to Acoustic Analysis
1.1. The General Acoustic Equations
1.2. Overview of the Acoustic Analysis Process
2. Using the Acoustic Analysis Tools
2.1. Elements Used in an Acoustic Analysis
2.2. Commands Used in an Acoustic Analysis
2.3. Understanding Acoustic Analysis Terminology
2.4. Acoustic Analysis Resources and Examples
3. Modeling for an Acoustic Analysis
4. Defining the Acoustic Modeling Environment
4.1. Defining Element Types
4.2. Specifying the System of Units
5. Defining Acoustic Material Properties
5.1. Basic Material Parameters of Acoustic Media
5.2. Non-Uniform Ideal Gas Material
5.3. Equivalent Fluid Model of Perforated Material
5.4. Viscous-Thermal Materials
5.4.1. Acoustic Propagation in the Viscous Fluid
5.4.2. Boundary Layer Impedance (BLI) Model
5.4.3. Low Reduced Frequency (LRF) Model
6. Specifying Acoustic Analysis Region Attributes and Meshing
7. Applying Boundary Conditions in an Acoustic Analysis
7.1. Applying Boundary Conditions
7.1.1. Pressure Boundary
7.1.2. Rigid Wall Boundary
7.1.3. Surface Impedance Boundary
7.1.4. Free Surface (Sloshing Effect)
7.2. Absorbing Boundary Condition (ABC)
7.3. Perfectly Matched Layers (PMLs)
7.4. Floquet Periodic Boundary Condition (FPBC)
7.4.1. Floquet Boundary Condition for Harmonic Analysis
7.4.2. Floquet Boundary Condition for Modal Analysis
8. Applying Excitation Sources and Loads in an Acoustic Analysis
8.1. Applying Acoustic Excitation Sources
8.1.1. Pressure Excitation
8.1.2. Outward Normal Velocity (Acceleration) Excitation
8.1.3. Arbitrary Velocity (Acceleration) Excitation
8.1.4. Analytic Incident Wave Sources
8.1.5. Mass Source (Mass Source Rate)
8.1.6. Random Excitation with Diffuse Sound Field
8.1.7. Specified Mode Excitation in an Acoustic Duct
8.2. Applying Acoustic Loads
8.2.1. Trim Element with Transfer Admittance Matrix
8.2.2. Impedance Sheet
8.2.3. Equivalent Surface Source
8.2.4. Surface Port
9. Accounting for Acoustic Fluid-Structure Interaction (FSI)
9.1. Matrix-Coupled FSI Solutions
9.2. One-Way Coupling FSI Solutions
10. Solving an Acoustic Analysis
10.1. Acoustic Analysis Solution Settings
10.1.1. Modal Analysis Settings
10.1.2. Harmonic Analysis Settings
10.1.3. Transient Analysis Settings
10.1.4. Spectrum Analysis
10.2. Starting and Finishing the Solution
11. Using Advanced Solution Techniques in an Acoustic Analysis
11.1. One-Way Coupling from Single Physics to Acoustics
11.1.1. One-Way Coupling from Structure to Acoustics
11.1.2. One-Way Coupling from ANSYS Fluent to Mechanical APDL Acoustics for Cabin Noise
11.2. Linear Perturbation in an Acoustic Application
12. Postprocessing Acoustic Analysis Results
12.1. Helpful Postprocessing Commands
12.2. Postprocessing a Harmonic Acoustic Analysis
12.2.1. Reviewing Analysis Results
12.2.2. Calculating Near Fields, Far Fields, and Far-Field Parameters
12.2.3. Calculating Acoustic Propagation Parameters
12.2.4. Calculating Acoustic Surface Quantities
12.2.5. Calculating Acoustic Volumetric Quantities
12.3. Postprocessing a Modal or Transient Acoustic Analysis
13. Acoustic Analysis Examples
13.1. Example: Acoustic-Structural Coupled Modal Resonance of an Annular Ring Submerged in Water with a Harmonic Analysis
13.2. Example: Sloshing Modes of a Cylindrical Cavity
13.3. Example: Resonant Frequencies in a Pipe with Ideal Gas
13.4. Example: Acoustic Harmonic Response in a Room
13.5. Example: Transmission Loss of a Muffler
13.6. Example: Johnson-Champoux-Allard Model of a Perforated Material
13.7. Example: Transfer Admittance Matrix in Fluid
13.8. Example: Boundary Layer Impedance Model of a Rigid Walled Waveguide with Viscous-Thermal Fluid
13.9. Example: Radiation from Two Waveguides
13.10. Example: Radiation from a Dipole
13.11. Example: Monopole Incident Wave Scattering of a Rigid Sphere
13.12. Example: Planar Incident Wave FSI Scattering of an Infinite Cylindrical Shell
13.13. Example: One-Way Coupling from Structure to Acoustics
13.14. Example: Modal Analysis of an Acoustic-Structural Coupled Structure with Nonlinear Static Prestress Using Linear Perturbation
13.15. Example: Spectrum Analysis of a Cylindrical Tank Filled with Water
13.16. Example: Structural Panel Subject to Excitation From a Diffuse Sound Field
13.17. Example: Transmission Loss of a Structural Panel under an Obliquely Incident Plane Wave
13.18. Example: Sound Far Field from a Piston Using Rayleigh Integral
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