General Course Information
|Course code||VTA091, course description|
|Course Administration||Wolfgang Kropp|
|Lecturers||Wolfgang Kropp, Patrik Höstmad|
|Lecture hall||Lecture room at TA|
|Exam||Three written reports and a final presentation|
|Course Evaluation||Find it here|
- Guidelines for report writing
- Course literature Technical Acoustics 1
- Literature about the specific methods can be found under each section.
- Optional reading: Additional literature on the different methods can be found in a separate section below.
Course PM available.
The following document describes the structure and gives information about the available measurement data. Note, that the material parameters which we provide are only starting values, i.e. average data as may be given by the producer of the plexiglas sheets and isolation materials.
These data are mainly intended to check against your numerical results.
Wave Approach – Infos and Data
Note that the geometry and the material data of the structure used in the Appendix: Matlab code is not necessarily completely identical to that of the current structure.
The Finite Element Method – Infos and Data
This document describes how you can install COMSOL Multiphysics 5 on your own computer. Please install it as class-kit license (CKL). The licenses are available via the student portal web site.
Here are the slides from the two lectures:
- Numerical methods for acoustical problems
- Example from SVM which was used at the beginning of the lecture
This is a document showing the complete Finite Difference and Finite Element derivations for the rod example used in the lecture:
In the lectures I might show (depending on time) a small Matlab example on the influence of the properties of the FEM matrices (banded, symmetric) on the speed of the eigenvalue solving. In the zip-file below you will find an html-file which tries to explain the numerical implications of the matrix properties. in a separate folder you can also find the data and the m-file which was used for creating the document.
Below you can find all relevant material for the assignment (cf. also the Experimental Data section). You will find the slides which were used when presenting the assignment, a more detailed task description and the Comsol Multiphysics Guide which describes how to implement the FE-model in Multiphysics. Read the latter document before going on with readMultiphysicsTXT.m.
- Detailed assignment description
- Slides from presentation of FE-task
- Comsol Multiphysics 4.2 (and higher) Guide
- Tool for reading Multiphysics’s txt files into Matlab. NOTE: There is a large risk of data loss if you try to import the txt file into Matlab without using this tool!
SEA – Infos and Data
Part 1 Vibrations
- SEA Assignment Part 1
- SEA – Theory and Application NB! 17 MB
- Users guide for the SEA software: AutoSEA LT
- Short step by step demo of how to work with AutoSEA LT
Part 2 Radiation
BEM – Infos and data
Here are the slides from the lecture with some additional notes. Thanks to Office 2016 the actual slides might be a little bit blurry, so you will also find a high-quality slides-only PDF of the presentation.
These are the documents for the task:
In the Optional Reading section at the bottom of this page you can find more documents about BEM theory.
Re-design part – Theory and useful information
Here are the slides from the introduction lectures:
Documents on some noise and vibration control measures:
- Document on enclosures from TU Berlin.
- Slides on vibration isolation. See also additional documents under Optional reading.
More information can also be found in L. Cremer, M. Heckl, B.A.T. Petersson: Structure-borne sound, 3rd ed., Springer (2005) (available as e-book from the Chalmers library).
Data sheets for different Sylomer vibration isolation materials:
A good document on numerical methods which describes the theory more general (not sticking as much to one example as we did):
A document with details about eigenvalue analysis, modal superposition and damping:
Two documents with a more mathematical approach at explaining BEM:
Two additional documents on vibration isolation: