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This is the first book of its kind that describes the use of ANSYS (R) finite element analysis (FEA) software, and MATLAB (R) engineering programming software to solve acoustic problems. It covers simple text book problems, such as determining the natural frequencies of a duct, to progressively more complex problems that can only be solved using FEA software, such as acoustic absorption and fluid-structure-interaction. It also presents benchmark cases that can be used as starting points for analysis. There are practical hints too for using ANSYS software. The material describes how to solve numerous problems theoretically, and how to obtain solutions from the theory using MATLAB engineering software, as well as analyzing the same problem using ANSYS Workbench and ANSYS Mechanical APDL.


Free downloads are provided on http://www.mecheng.adelaide.edu.au/avc/software, including MATLAB source code, ANSYS APDL models, and ANSYS Workbench models




Includes readers' techniques and tips for new and experienced users of ANSYS software
Identifies bugs and deficiencies to help practitioners avoid making mistakes









It can be used as a textbook for graduate students in acoustics, vibration, and related areas in engineering; undergraduates in mechanical and electrical engineering; and as an authoritative reference for industry professionals. "... my students have found the book invaluable for learning how to use ANSYS Workbench for solving vibro-acoustics problems. The examples are numerous, detailed, well-chosen and complete with theoretical solutions. For these reasons and others, I believe ANSYS users will keep a copy of the book nearby and refer to it often."
-Noise Control Engineering Journal, July-August 2015


"A tour de force of quintessential theoretical acoustical topics with an exceptionally coherent crash course in finite element analysis (FEA) software."
-Journal of the Audio Engineering Society


"This book is a must for those wanting to explore and investigate the world of computational engineering acoustics. ...Its comprehensive instructional framework supports a conversational, down-to-earth narrative style."
-Andrew Peplow, Noise and vibration specialist, Atlas Copco Rock Drills, Sweden


"These guys know their stuff!! ...I thoroughly recommend this book to anyone who is involved in acoustic modelling - it forms the perfect basis for acoustic course work as well as being useful for research and industrial modelling of acoustic devices."
-Ian Bedwell, Thales Australia, Underwater Systems, Technical Consultant

Acoustic Analyses Using Matlab (R) and Ansys (R)

Introduction





About This Book





A Philosophy for Finite Element Modelling





Analysis Types





Background





Learning Outcomes





Introduction





Pressure Formulated Acoustic Elements





Fluid Structure Interaction





Displacement Formulated Acoustic Elements





Practical Aspects of Modelling Acoustic Systems with FEA





Element Types in ANSYS for Acoustic Analyses





ACT Acoustics Extension





Other Acoustic Loads





Other Measures of Acoustic Energy





Mesh Density





Use of Symmetry





Ducts





Learning Outcomes





Theory





Example of a Circular Duct





Resonator Silencers





Non-Plane Waves





Gas Temperature Variations





Sound Inside a Rigid-Walled Cavity





Learning Outcomes





Description of the System





Theory





Example





Introduction to Damped Acoustic Systems





Learning Outcomes





Introduction





General Discussion of Damping of Vibro-Acoustic Systems in ANSYS





Theory





Example: 2D Impedance Tube with a Real Admittance





Example: 2D Impedance Tube with a Complex Termination





Impedance





Example: 2D Impedance Tube





Example: 3D Impedance Tube





Example: 3D Waveguide with Visco-Thermal Losses





Application of Spectral Damping to a Rigid Walled Cavity





Sound Absorption in a Lined Duct





Learning Outcomes





Definitions





Description of the System





Theory





Example - Locally Reacting Liner





Example - Bulk Reacting Liner





Room Acoustics





Learning Outcomes





Description of the System





Theory





Example: Reverberation Room





Radiation and Scattering





Learning Outcomes





Wave Absorbing Conditions





Example: Directivity of Acoustic Wave Sources





Example: Radiation of a Baffled Piston





Scattering





Example: Scattering from a Cylinder





Fluid Structure Interaction





Learning Outcomes





Fluid Structure Interaction Using ANSYS





FSI Using Modal Coupling





Example: Flexible Plate Attached to an Acoustic Cavity





Example: Transmission Loss of a Simply Supported Panel





A. Files Included With This Book





B. Advice for Using ANSYS





C. MATLAB Functions for Modal Coupling





D. Errors





E. Export of Nodal Area from ANSYS





Bibliography





Index