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comsol声学模块介绍
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更新于2023-03-16
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comsol是比较好的物理场仿真软件,本文件是comsol下的声学模块,比较详细地介绍了声学模块的应用
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VERSION 4.4
Introduction to
Acoustics Module
Contact Information
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Part number: CM020204
Introduction to the Acoustics Module
© 1998–2013 COMSOL
Protected by U.S. Patents 7,519,518; 7,596,474; 7,623,991; and 8,457,932. Patents pending.
This Documentation and the Programs described herein are furnished under the COMSOL Software License
Agreement (www.comsol.com/sla) and may be used or copied only under the terms of the license agreement.
COMSOL, COMSOL Multiphysics, Capture the Concept, COMSOL Desktop, and LiveLink are either registered
trademarks or trademarks of COMSOL AB. All other trademarks are the property of their respective owners, and
COMSOL AB and its subsidiaries and products are not affiliated with, endorsed by, sponsored by, or supported by
those trademark owners. For a list of such trademark owners, see www.comsol.com/tm.
Version: November 2013 COMSOL 4.4
| i
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
The Acoustics Module Physics Interfaces. . . . . . . . . . . . . . . . . . . . . . 3
The Physics Interface List by Space Dimension and Study Type . . 7
The Model Libraries Window . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Basics of Acoustics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Governing Equations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Length and Time Scales . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Boundary Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Elastic Waves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Models with Losses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Model Example: Absorptive Muffler . . . . . . . . . . . . . . . . . . . . . . 16
Model Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Domain Equations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Boundary Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Results and Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Additional Examples from the Model Library. . . . . . . . . . . . . . . 43
Gaussian Explosion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Eigenmodes in a Muffler. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Piezoacoustic Transducer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Loudspeaker Driver in a Vented Enclosure . . . . . . . . . . . . . . . . . . . 45
The Brüel & Kjær 4134 Condenser Microphone . . . . . . . . . . . . . . 46
ii |
Introduction | 1
Introduction
The Acoustics Module consists of a set of physics interfaces, which enable you to
simulate the propagation of sound in fluids and in solids. The interface
applications include pressure acoustics, acoustic-solid interaction, aeroacoustics,
and thermoacoustics.
Figure 1: COMSOL model of the sound pressure level distribution in a muffler system.
Acoustic simulations using this module can easily model classical problems such as
scattering, diffraction, emission, radiation, and transmission of sound. These
problems are relevant to muffler design, loudspeaker construction, sound
insulation for absorbers and diffusers, the evaluation of directional acoustic
patterns like directivity, noise radiation problems, and much more. The
acoustic-structure interaction features can model problems involving structure-
and fluid-born sound and their interaction. For example, acoustic-structure
interaction is simulated for detailed muffler design, ultrasound piezo-actuators,
sonar technology, and noise and vibration analysis of machinery in the automotive
industry. Using the COMSOL Multiphysics capabilities enables the analysis and
design of electroacoustic transducers such as loudspeakers, sensors, microphones,
and receivers.
Aeroacosutic problems can be analyzed and modeled by solving either the
linearized potential flow equations or the linearized Euler equations. These are
used to model the one way interaction between an external flow and an acoustic
field, applications range from jet-engine noise analysis to simulating acoustic flow
sensors and mufflers with flow.
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