Structure-acoustic analysis; finite element modelling and reduction methods
Author
Summary, in English
This type of analysis is applicable to a wide range of engineering problems, for example, studying the interior noise in a vehicle or the sound transmission loss in a wall between two dwellings. The geometrical properties of the studied system and the frequency limit of interest for the analysis determine the size of the system of equations to be solved. This size often becomes very large and the solution time becomes long.
To decrease the size of the system, and thereby speeding up the analysis, methods are investigated and developed, using substructuring and modal reduction, for the analysis of structure-acoustic problems. The geometric problem domain is divided into a number of subdomains and a reduced set of basis vectors is derived for each of these subdomains. The set of basis vectors for each domain is derived to include information about both the internal behaviour of the subdomain and the coupling to the other subdomains. The reduced description enables efficient solution of the total system.
An important feature is to include the description of porous sound absorbing materials in the reduction process of the structure-acoustic problems.
The derived procedures are employed in engineering applications; particularly in the study of the sound transmission loss of lightweight double-leaf walls in the low-frequency range. The objective is to include a detailed geometric description of the problem enabling a structured evaluation of the influence of various geometrical and material properties of the studied wall on the predicted sound transmission loss.
Department/s
Publishing year
2004-08
Language
English
Publication/Series
TVSM-1000
Issue
TVSM-1018
Full text
Document type
Dissertation
Publisher
Division of Structural Mechanics, Box 118; 221 00 Lund,
Topic
- Mechanical Engineering
Keywords
- Mechanical engineering
- hydraulics
- vacuum technology
- vibration and acoustic engineering
- Maskinteknik
- hydraulik
- vakuumteknik
- vibrationer
- akustik
- low frequency range
- building acoustics
- lightweight structures
- porous materials
- modal reduction
- substructuring
- finite element analysis
- structural acoustics
- vibroacoustics
- Structural dynamics
Status
Published
Supervisor
ISBN/ISSN/Other
- ISSN: 0281-6679
- ISBN: 91-628-6176-X
Defence date
20 September 2004
Defence time
13:15
Defence place
V:B, V-building, Lund Institute of Technology, John Ericssons väg 1, Lund
Opponent
- Roger Ohayon