Technical Acoustics II
Applied Acoustics : Education : Course Pages : Technical Acoustics II
VTA 091 - Master's Programme. The course consists of 20 hours lecture and sub-project work in groups. 7.5 credits.
General Course Information
Examinator: Wolfgang Kropp
Teachers:
Room: All lectures and exercises at the Department of Applied Acoustics
Exam: Two written reports + one short technical report and a final presentation.
Course PM: The course PM can be found here.
Literature
- Course literature Technical Acoustics 1
- Literature about the specific methods can be found under each section.
Notice board
Posted April 16, 2013 The Measurements of the radiated sound pressure are uploaded
downlaod here. /WK
Posted March 6, 2013 The final (?) BEM package is now on the server (see below). /WK
Posted Feb 22, 2013 Slides for FEM part of feedback meeting online. /CH
Experimental data
The following document describes the structure and gives information about the available measurement data. Note, that the material parameters which we provide are only start values, average data as may be given by the producer of the plexiglas sheets and isolation materials.
Structural and Geometrical Data plus Measurement Descriptions.
Measured Data
These data are mainly intended to check against your numerical results.
Animations of modes Use these animations as very rough guidelines for the validity of your FE model. These were extracted from a previous version of the structure with somewhat different geometry. Do not use them for the finetuning of your model!
SEA - Infos and data
Part 1 Vibrations
SEA - Theory and Application NB! 17 MB
Radiation from finite-sized baffled plates
Users guide for the SEA software: AutoSEA LT
Short step by step demo of how to work with AutoSEA LT
Wave approach - Infos and data
Note that the geometry of the structure used in the Appendix: Matlab code is not completely identical to that of the current structure.
The Finite Element Method - Infos and Data
There are two computers available at the Division of Applied Acoustics for conducting the FE-assignment: One is situated in the computer room opposite the kitchen and the other one in the room in front of the lecture room. COMSOL Multiphysics 4.3a can also be installed on your own computer, see below.
This document describes how you can install COMSOL Multiphysics 4.3a on you own computer. Please install it as class-kit license (CKL). The licenses are available at the student portal web site.
Chalmers COMSOL license information.
Here are the slides from the two lectures:
Numerical methods for acoustical problems.
This is a document showing the complete Finite Difference and Finite Element derrivations for the rod example used in the lecture:
Derivations of the Finite Difference and Finite Element Methods as shown in the TA2 lectures.
Another really good document which describes the theory more general (not sticking as much to one example as we did) is also available for curious readers:
Numerical Methods - From Euler to FEM.
Below, all material pertaining to the assignment is found (cf. also Experimental Data section). You will find the slides and a which were used when presenting the assignment, a more detailled task description and the Comsol Multiphysics 4.2 Guide which describes how to implement the FE-model in Multiphysics 4.2. Read the latter document before going on with readMultiphysicsTXT.m.
Detailled assignment description
Comsol Multiphysics 4.2 (and higher) Guide
Tool for reading Multiphysics's txt files into Matlab.
The following files are only needed if you happen to have a copy of Multiphysics 3.5 on your computer and want to use this instead of Multiphysics 4.
M-file tools documentation and m-files (for use with Multiphysics 3.5)
These are the slides from the feedback lecture:
Feedback on vibration report - FEM part.
BEM - Infos and data
BEM package (updated 6/3 2013)
Measurements of the mean sound pressure - Infos and data
Measurements of the uncalibrated mean pressure in the reverberation chamber for the motor mounted on the structure and the motor freely suspended.
Vibration isolation
Vibration Isolation presentation by Patrik Andersson
Vibration Isolation presentation by Lars Ivarsson
Vibration Isolation - Mobility Methods, Power Transmission by Juha Plunt
