First Steps Towards a Digital Plane Wave Superposition Method for Vibroacoustic Problems
Aerotecnica Missili & Spazio
View Publication Info| Field | Value | |
| Title |
First Steps Towards a Digital Plane Wave Superposition Method for Vibroacoustic Problems
|
|
| Creator |
De Rosa, Sergio
Koopmann, Gary Marulo, Francesco |
|
| Subject |
Structure
wave expansion; impedance; vibroacoustic design; computational methods; spatial fourier transform Vibroacoustics |
|
| Description |
In transportation engineering, there is the need of having quick and reliable tools for estimating the acoustic power radiated by a given elastic surfaces. Normally, the computational and experimental tools, or their combination, are based on CPU time-consuming matrix methods. This collaborative activity started some years ago as a way to share this central question, i.e. is it possible to build on digital methods that can easily and quickly reproduce (vibro)acoustic fields without using conventional CPU time-consuming matrix methods? In all the present numerical methods, the matrix central to the full computational process is not universal, i.e., repetitive computations are required for each new set of design iterations. The aim of this paper is the denition of a universal acoustic impedance matrix that accommodates any form of surface radiator, regardless of its geometry or boundary condition using a digitized, acoustic-space concept. Plane wave superposition is used on a map on which the points and the wave numbers are simply related by integers. This new concept for re-imagining acoustic space is expected to have several features: 1) the space is mapped in terms of a grid-work of evenly-spaced integer points, 2) each grid is insonied with a collection of plane waves chosen to generate the Greens functions comprising the impedance matrix and 3) the acoustic impedance matrix (derived via the plane waves superposition and the digitized method) leads to orthogonality and consequently no inversion operation is required. Some of these steps are now ready and shown in the present work. The nal goal is still to be achieved but the paper presents the first successful test cases and the denition of the main points of the expected procedure.
|
|
| Publisher |
Associazione Italiana di Aeronautica e Astronautica (AIDAA)
|
|
| Contributor |
—
|
|
| Date |
2018-07-11
|
|
| Type |
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion Peer-reviewed Article numerical; analytical; simulation |
|
| Format |
application/pdf
|
|
| Identifier |
http://131.114.27.37/index.php/AMS/article/view/343
10.19249/ams.v97i1.343 |
|
| Source |
Aerotecnica Missili & Spazio; Vol 97, No 1 (2018); 13-18
0365-7442 |
|
| Language |
eng
|
|
| Relation |
http://131.114.27.37/index.php/AMS/article/view/343/pdf
|
|
| Rights |
Copyright (c) 2018 Aerotecnica Missili & Spazio
|
|
