A New Technique to Identify Arbitrarily Shaped Noise Sources
Acoustic intensity is one of the available tools for evaluating sound radiation from vibrating bodies. Active intensity may, in some situations, not give a faithful insight about how much energy is in fact carried into the far field. It was then proposed a new parameter, the supersonic acoustic inte...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2006-01-01
|
| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2006/231625 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832557043410534400 |
|---|---|
| author | Roberto A. Tenenbaum Marcelo Bruno S. Magalhães |
| author_facet | Roberto A. Tenenbaum Marcelo Bruno S. Magalhães |
| author_sort | Roberto A. Tenenbaum |
| collection | DOAJ |
| description | Acoustic intensity is one of the available tools for evaluating sound radiation from vibrating bodies. Active intensity may, in some situations, not give a faithful insight about how much energy is in fact carried into the far field. It was then proposed a new parameter, the supersonic acoustic intensity, which takes into account only the intensity generated by components having a smaller wavenumber than the acoustic one. However, the method is only efective for simple sources, such as plane plates, cylinders and spheres. This work presents a new technique, based on the Boundary Elements Method and the Singular Value Decomposition, to compute the supersonic acoustic intensity for arbitrarily shaped sources. The technique is based in the Kirchoff-Helmholtz equation in a discretized approach, leading to a radiation operator that relates the normal velocity on the source's surface mesh with the pressure at grid points located in the field. Then, the singular value decomposition technique is set to the radiation operator and a cutoff criterion is applied to remove non propagating components. Some numerical examples are presented. |
| format | Article |
| id | doaj-art-a05ba14d1c6a4478b8b217f113c3ef35 |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2006-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-a05ba14d1c6a4478b8b217f113c3ef352025-02-03T05:43:43ZengWileyShock and Vibration1070-96221875-92032006-01-01134-521923210.1155/2006/231625A New Technique to Identify Arbitrarily Shaped Noise SourcesRoberto A. Tenenbaum0Marcelo Bruno S. Magalhães1Instituto Politécnico do Rio de Janeiro, IPRJ/UERJ, Rua Alberto Rangel, s/n, Vila Nova, 28630-050, Nova Friburgo, RJ, BrazilFSAO Virtual Series Department, Ford Motor Company, BrazilAcoustic intensity is one of the available tools for evaluating sound radiation from vibrating bodies. Active intensity may, in some situations, not give a faithful insight about how much energy is in fact carried into the far field. It was then proposed a new parameter, the supersonic acoustic intensity, which takes into account only the intensity generated by components having a smaller wavenumber than the acoustic one. However, the method is only efective for simple sources, such as plane plates, cylinders and spheres. This work presents a new technique, based on the Boundary Elements Method and the Singular Value Decomposition, to compute the supersonic acoustic intensity for arbitrarily shaped sources. The technique is based in the Kirchoff-Helmholtz equation in a discretized approach, leading to a radiation operator that relates the normal velocity on the source's surface mesh with the pressure at grid points located in the field. Then, the singular value decomposition technique is set to the radiation operator and a cutoff criterion is applied to remove non propagating components. Some numerical examples are presented.http://dx.doi.org/10.1155/2006/231625 |
| spellingShingle | Roberto A. Tenenbaum Marcelo Bruno S. Magalhães A New Technique to Identify Arbitrarily Shaped Noise Sources Shock and Vibration |
| title | A New Technique to Identify Arbitrarily Shaped Noise Sources |
| title_full | A New Technique to Identify Arbitrarily Shaped Noise Sources |
| title_fullStr | A New Technique to Identify Arbitrarily Shaped Noise Sources |
| title_full_unstemmed | A New Technique to Identify Arbitrarily Shaped Noise Sources |
| title_short | A New Technique to Identify Arbitrarily Shaped Noise Sources |
| title_sort | new technique to identify arbitrarily shaped noise sources |
| url | http://dx.doi.org/10.1155/2006/231625 |
| work_keys_str_mv | AT robertoatenenbaum anewtechniquetoidentifyarbitrarilyshapednoisesources AT marcelobrunosmagalhaes anewtechniquetoidentifyarbitrarilyshapednoisesources AT robertoatenenbaum newtechniquetoidentifyarbitrarilyshapednoisesources AT marcelobrunosmagalhaes newtechniquetoidentifyarbitrarilyshapednoisesources |