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E-raamat: Acoustic Analyses Using Matlab® and Ansys® [Taylor & Francis e-raamat]

(The University of Adelaide, Australia), (The University of Adelaide, Australia)
  • Formaat: 708 pages, 74 Tables, black and white; 203 Illustrations, black and white
  • Ilmumisaeg: 26-Jul-2017
  • Kirjastus: CRC Press
  • ISBN-13: 9780429069642
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  • Taylor & Francis e-raamat
  • Hind: 327,75 €*
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Acoustic Analyses Using Matlab® and Ansys®Suurem pilt
  • Formaat: 708 pages, 74 Tables, black and white; 203 Illustrations, black and white
  • Ilmumisaeg: 26-Jul-2017
  • Kirjastus: CRC Press
  • ISBN-13: 9780429069642
Teised raamatud teemal:
Taylor & Francis e-raamatudRohkem infot Taylor & Francis e-raamatute kohta

Techniques and Tools for Solving Acoustics Problems

This is the first book of its kind that describes the use of ANSYS® finite element analysis (FEA) software, and MATLAB® 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.

Developed for the Practicing Engineer

  • Free downloads 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

Acoustic Analyses Using MATLAB® and ANSYS® 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.

Foreword xxxiii
Preface xxxv
Acknowledgments xxxvii
1 Introduction 1(10)
1.1 About This Book
1(2)
1.1.1 MATLAB Code
1(1)
1.1.2 ANSYS
2(1)
1.1.3 ANSYS Workbench Models
2(1)
1.1.4 ANSYS Mechanical APDL Code
3(1)
1.2 A Philosophy for Finite Element Modeling
3(3)
1.3 Analysis Types
6(5)
1.3.1 Modal
7(1)
1.3.2 Harmonic
8(1)
1.3.3 Transient Dynamic Analysis
9(1)
1.3.4 Spectrum Analysis
10(1)
2 Background 11(90)
2.1 Learning Outcomes
11(1)
2.2 Introduction
11(2)
2.3 Pressure-Formulated Acoustic Elements
13(1)
2.4 Fluid-Structure Interaction
13(4)
2.5 Displacement-Formulated Acoustic Elements
17(2)
2.6 Practical Aspects of Modeling Acoustic Systems with FEA
19(3)
2.7 Element Types in ANSYS for Acoustic Analyses
22(10)
2.7.1 FLUID29 2D Acoustic Fluid Element
23(1)
2.7.2 FLUID30 3D Acoustic Fluid Element
24(2)
2.7.3 FLUID129 2D Infinite Acoustic Element
26(2)
2.7.4 FLUID130 3D Infinite Acoustic Element
28(2)
2.7.5 FLUID220 3D Acoustic Fluid 20-Node Solid Element
30(1)
2.7.6 FLUID221 3D Acoustic Fluid 10-Node Solid Element
31(1)
2.8 ACT Acoustics Extension
32(45)
2.8.1 Acoustic Body
32(4)
2.8.2 Excitation
36(15)
2.8.2.1 Wave Sources
36(11)
2.8.2.2 Normal Surface Velocity
47(1)
2.8.2.3 Mass Source
48(1)
2.8.2.4 Surface Velocity
49(1)
2.8.2.5 Normal Surface Acceleration
49(2)
2.8.2.6 Mass Source Rate
51(1)
2.8.2.7 Surface Acceleration
51(1)
2.8.3 Body Force Loads
51(3)
2.8.3.1 Static Pressure
52(1)
2.8.3.2 Impedance Sheet
53(1)
2.8.3.3 Temperature
53(1)
2.8.4 Boundary Conditions
54(8)
2.8.4.1 Acoustic Pressure
54(1)
2.8.4.2 Impedance Boundary
55(3)
2.8.4.3 Thermo-viscous BLI Boundary
58(1)
2.8.4.4 Free Surface
58(1)
2.8.4.5 Radiation Boundary
59(1)
2.8.4.6 Absorbing Elements
59(1)
2.8.4.7 Attenuation Surface
60(1)
2.8.4.8 Equivalent Source Surface
61(1)
2.8.5 Results
62(15)
2.8.5.1 Acoustic Pressure
62(3)
2.8.5.2 Acoustic Sound Pressure Level
65(1)
2.8.5.3 Acoustic Velocity
66(1)
2.8.5.4 Acoustic Pressure Gradient
67(1)
2.8.5.5 Acoustic Far Field
67(3)
2.8.5.6 Acoustic Near Field
70(3)
2.8.5.7 Acoustic Time Frequency Plot
73(1)
2.8.5.8 Muffler Transmission Loss
74(1)
2.8.5.9 Tools
75(1)
2.8.5.10 Insertion of Boundary Conditions Based on Named Selections
76(1)
2.8.5.11 Insertion of FSI Interfaces Based on Contacts
77(1)
2.9 Other Acoustic Loads
77(2)
2.9.1 Displacement
78(1)
2.9.2 Flow
78(1)
2.10 Other Measures of Acoustic Energy
79(8)
2.10.1 Sound Intensity
80(2)
2.10.2 Sound Power
82(2)
2.10.3 Acoustic Potential Energy
84(1)
2.10.4 Acoustic Energy Density
85(1)
2.10.5 Structural Kinetic Energy
86(1)
2.11 Mesh Density
87(3)
2.12 Use of Symmetry
90(11)
3 Ducts 101(124)
3.1 Learning Outcomes
101(1)
3.2 Theory
101(5)
3.2.1 Natural Frequencies
102(1)
3.2.2 Four-Pole Method
103(2)
3.2.3 Acoustic Performance Metrics
105(1)
3.3 Example of a Circular Duct
106(60)
3.3.1 ANSYS Workbench
107(23)
3.3.2 Results: Effect of Mesh Density
130(4)
3.3.3 Natural Frequencies of Open-Rigid and Open-Open Ducts
134(4)
3.3.4 Pressure and Velocity Distribution along the Duct
138(6)
3.3.5 Results: Pressure and Velocity along the Duct
144(2)
3.3.6 Infinite and Semi-Infinite Loss-Less Ducts
146(1)
3.3.7 Radiation from an Open-Ended Duct
147(19)
3.3.7.1 Theory
148(1)
3.3.7.2 ANSYS Workbench
149(10)
3.3.7.3 Results
159(2)
3.3.7.4 Impedance Varying with Frequency
161(3)
3.3.7.5 Results
164(2)
3.4 Resonator Silencers
166(27)
3.4.1 Geometries
166(1)
3.4.2 Example: Quarter-Wavelength Tube Silencer
167(19)
3.4.2.1 Theory
167(3)
3.4.2.2 MATLAB
170(1)
3.4.2.3 ANSYS Workbench
170(16)
3.4.3 Example: Expansion Chamber Silencer
186(14)
3.4.3.1 Theory
187(1)
3.4.3.2 MATLAB
188(1)
3.4.3.3 ANSYS Workbench
189(2)
3.4.3.4 Results
191(2)
3.5 Non-Plane Waves
193(7)
3.6 Gas Temperature Variations
200(25)
3.6.1 Theory
200(3)
3.6.2 MATLAB
203(1)
3.6.3 ANSYS Workbench
204(16)
3.6.4 ANSYS Mechanical APDL
220(5)
4 Sound Inside a Rigid-Walled Cavity 225(30)
4.1 Learning Outcomes
225(1)
4.2 Description of the System
225(1)
4.3 Theory
225(3)
4.3.1 Natural Frequencies and Mode Shapes
226(1)
4.3.2 Harmonic Response
227(1)
4.4 Example
228(27)
4.4.1 MATLAB
228(1)
4.4.2 ANSYS Workbench
229(17)
4.4.3 ANSYS Mechanical APDL
246(3)
4.4.4 Results
249(6)
5 Introduction to Damped Acoustic Systems 255(66)
5.1 Learning Outcomes
255(1)
5.2 Introduction
255(4)
5.2.1 Viscous or Linear Damping
256(2)
5.2.2 Hysteretic or Structural Damping
258(1)
5.2.3 Air Damping
258(1)
5.2.4 Coulomb Damping
259(1)
5.3 General Discussion of Damping of Vibro-Acoustic Systems in ANSYS
259(7)
5.4 Theory
266(3)
5.5 Example: 2D Impedance Tube with a Real Admittance
269(10)
5.5.1 Description of the System
269(1)
5.5.2 Theory
270(2)
5.5.3 Model
272(1)
5.5.4 MATLAB
273(1)
5.5.5 ANSYS Mechanical APDL
273(6)
5.6 Example: 2D Impedance Tube with a Complex Termination Impedance
279(5)
5.6.1 Description of the System
279(1)
5.6.2 ANSYS Mechanical APDL
280(4)
5.7 Example: 2D Impedance Tube
284(6)
5.7.1 Theory
285(1)
5.7.2 Example
286(1)
5.7.3 MATLAB
287(1)
5.7.4 ANSYS Mechanical APDL
287(3)
5.8 Example: 3D Impedance Tube
290(12)
5.8.1 Model
290(1)
5.8.2 ANSYS Workbench
290(10)
5.8.3 Discussion
300(2)
5.9 Example: 3D Waveguide with Visco-Thermal Losses
302(11)
5.9.1 Theory
303(2)
5.9.2 Model
305(1)
5.9.3 MATLAB
306(1)
5.9.4 ANSYS Workbench
306(7)
5.9.5 ANSYS Mechanical APDL
313(1)
5.10 Application of Spectral Damping to a Rigid-Walled Cavity
313(8)
5.10.1 Spectral Damping Types
314(2)
5.10.2 Example: Damping in a Rigid-Walled Cavity
316(1)
5.10.3 MATLAB
316(1)
5.10.4 ANSYS Mechanical APDL
316(7)
5.10.4.1 Constant Damping Ratio
317(1)
5.10.4.2 Rayleigh Damping
318(1)
5.10.4.3 Mode-Dependent Damping
319(2)
6 Sound Absorption in a Lined Duct 321(48)
6.1 Learning Outcomes
321(1)
6.2 Definitions
321(1)
6.3 Description of the System
322(1)
6.4 Theory
323(12)
6.4.1 Insertion Loss (IL) and Transmission Loss (TL)
323(1)
6.4.2 Locally Reacting Liners
324(2)
6.4.3 Darcy's Law, Flow Resistivity, and the Relationship with Impedance
326(2)
6.4.3.1 Darcy's Law
326(1)
6.4.3.2 Flow Resistivity
326(1)
6.4.3.3 Delany and Bazley
327(1)
6.4.3.4 The Effect of Temperature on Impedance
328(1)
6.4.4 Bulk Reacting Liners
328(7)
6.4.4.1 Isotropic Media with No Mean Flow
329(1)
6.4.4.2 Perforated and Limp Surface Facings
329(1)
6.4.4.3 Porous Media
330(5)
6.5 Example: Locally Reacting Liner
335(28)
6.5.1 MATLAB
338(1)
6.5.2 ANSYS Workbench
338(19)
6.5.2.1 Rigid-Walled Duct
338(17)
6.5.2.2 Local Reacting Liner
355(2)
6.5.3 ANSYS Mechanical APDL
357(4)
6.5.4 Results
361(2)
6.6 Example: Bulk Reacting Liner
363(6)
6.6.1 MATLAB
363(1)
6.6.2 ANSYS Workbench
364(1)
6.6.3 ANSYS Mechanical APDL
365(1)
6.6.4 Results
365(4)
7 Room Acoustics 369(62)
7.1 Learning Outcomes
369(1)
7.2 Description of the System
369(1)
7.3 Theory
370(6)
7.3.1 Room Acoustics
370(3)
7.3.2 Sound Power from Harmonic Sources
373(3)
7.3.2.1 Determination of Sound Power from a Flow Acoustic Source
374(1)
7.3.2.2 Determination of Sound Power from an Acoustic Mass Source
375(1)
7.4 Example: Reverberation Room
376(55)
7.4.1 Model
379(15)
7.4.1.1 Model: MATLAB
379(1)
7.4.1.2 Model: ANSYS Workbench
379(14)
7.4.1.3 Model: ANSYS Mechanical APDL
393(1)
7.4.2 Modal Analysis
394(8)
7.4.2.1 Modal Analysis: MATLAB
394(2)
7.4.2.2 Modal Analysis: ANSYS Workbench
396(5)
7.4.2.3 Modal Analysis: ANSYS Mechanical APDL
401(1)
7.4.3 Harmonic Analysis
402(12)
7.4.3.1 Harmonic Analysis: MATLAB
402(1)
7.4.3.2 Harmonic Analysis: ANSYS Workbench
403(10)
7.4.3.3 Harmonic Analysis: ANSYS Mechanical APDL
413(1)
7.4.4 Transient Analysis
414(17)
7.4.4.1 Transient Analysis: MATLAB
416(1)
7.4.4.2 Discussion of Transient Solvers in ANSYS
417(1)
7.4.4.3 Transient Analysis: ANSYS Workbench
418(9)
7.4.4.4 Transient Analysis: ANSYS Mechanical APDL
427(4)
8 Radiation and Scattering 431(102)
8.1 Learning Outcomes
431(1)
8.2 Wave-Absorbing Conditions
431(7)
8.2.1 Perfectly Matched Layers
432(3)
8.2.2 Radiation Boundary
435(1)
8.2.3 Infinite Acoustic Elements
436(2)
8.3 Example: Directivity of Acoustic Wave Sources
438(21)
8.3.1 Comparison of Monopole Acoustic Sources Calculated Theoretically and Using ANSYS Workbench
441(8)
8.3.2 Comparison of Monopole Acoustic Wave Source and Acoustic Mass Source
449(3)
8.3.3 Comparison of Monopole and Back-Enclosed Loudspeaker Acoustic Sources
452(3)
8.3.4 Comparison of Dipole Acoustic Source Calculated Theoretically and Using ANSYS Workbench
455(3)
8.3.5 Comparison of Dipole and Bare Loudspeaker
458(1)
8.4 Example: Radiation of a Baffled Piston
459(52)
8.4.1 Learning Outcomes
459(1)
8.4.2 Theory
460(2)
8.4.3 MATLAB
462(3)
8.4.4 ANSYS Workbench
465(43)
8.4.5 ANSYS Mechanical APDL
508(3)
8.5 Scattering
511(1)
8.6 Example: Scattering from a Cylinder
512(21)
8.6.1 Learning Outcomes
512(1)
8.6.2 Theory
512(3)
8.6.3 MATLAB
515(4)
8.6.4 ANSYS Workbench
519(14)
9 Fluid-Structure Interaction 533(68)
9.1 Learning Outcomes
533(1)
9.2 Fluid-Structure Interaction Using ANSYS
533(18)
9.2.1 Introduction
533(1)
9.2.2 Example: Transmission Loss of a Plate in a Duct
534(17)
9.3 FSI Using Modal Coupling
551(6)
9.3.1 Introduction
551(1)
9.3.2 Theory
552(5)
9.4 Example: Flexible Plate Attached to an Acoustic Cavity
557(30)
9.4.1 Theory
559(4)
9.4.2 MATLAB
563(2)
9.4.3 ANSYS Workbench
565(12)
9.4.4 ANSYS Mechanical APDL
577(3)
9.4.5 MATLAB Code for Modal Coupling of ANSYS Models
580(7)
9.5 Example: Transmission Loss of a Simply Supported Panel
587(14)
9.5.1 Learning Objectives
587(1)
9.5.2 Theory
587(4)
9.5.3 MATLAB
591(1)
9.5.4 ANSYS Mechanical APDL
591(10)
A Files Included with This Book 601(16)
A.1 Table of Files Included with This Book
601(16)
B Advice for Using ANSYS 617(2)
B.1 Recommended Practice
617(2)
C MATLAB Functions for Modal Coupling 619(12)
C.1 MATLAB Functions for Modal Coupling
619(12)
D Errors 631(18)
D.1 Errors Relating to References
631(2)
D.1.1 Definition of Power
631(1)
D.1.2 Equation for Scattered Pressure by a Cylinder
631(2)
D.1.3 Temperature Gradient in a Duct
633(1)
D.2 Issues Relating to ANSYS
633(16)
D.2.1 ANSYS Mechanical APDL and ANSYS Workbench
634(6)
D.2.1.1 Issues
634(1)
D.2.1.2 Traps
635(3)
D.2.1.3 Limitations
638(2)
D.2.2 ACT Acoustics Extension
640(2)
D.2.2.1 Issues
640(1)
D.2.2.2 Limitations
641(1)
D.2.3 Other
642(1)
D.2.3.1 ANSYS Documentation
642(1)
D.2.4 ANSYS Errors Messages
643(6)
E Export of Nodal Area from ANSYS 649(2)
E.1 Calculation of Nodal Area
649(2)
References 651(14)
Index 665
Dr. Carl Howard is a Lecturer at the University of Adelaide. He has been a consultant with Vipac Engineers and Scientists, Worley, and Colin Gordon and Associates, and also worked at United Technologies Research Center.



Dr Ben Cazzolato is an Associate Professor at the University of Adelaide. He has over two decades' experience as an acoustic consultant and academic researcher.
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