Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
Projection of acoustic fields using the Fourier transform
A method is presented for projecting acoustic fields using the Fourier transform. It is shown that the source velocity distribution can be represented by a number of sinusoids. Each sinusoid gives rise to a plane wave whose direction is given by the wavelength of the sinusoid. The plane waves are su...
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis |
| Language: | English |
| Published: |
Department of Electrical Engineering
2014
|
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613307226030080 |
|---|---|
| access_status_str | Open Access |
| author | Yudelman, Errol |
| author2 | Denbigh, P N |
| author_browse | Denbigh, P N Yudelman, Errol |
| author_facet | Denbigh, P N Yudelman, Errol |
| author_sort | Yudelman, Errol |
| collection | Thesis |
| description | A method is presented for projecting acoustic fields using the Fourier transform. It is shown that the source velocity distribution can be represented by a number of sinusoids. Each sinusoid gives rise to a plane wave whose direction is given by the wavelength of the sinusoid. The plane waves are summed at the plane of interest to obtain the resulting pressure field. Errors are introduced when projecting pressure fields by large distances. These are circumvented by observing that the farfield pressure pattern can be found by simply taking the Fourier transform of the nearfield pressure distribution. A rectangular source is simulated on the computer; the Fourier transform technique of projecting fields is compared to a direct integration technique. The Fourier transform technique is used to back project a measured pressure pattern to detect defects on the transducer face. Measurements of pressure are made in the nearfield of a circular transducer. These measurements are forward and back projected to give the pressure and velocity at other planes. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/7588 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:34:03.682Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2014 |
| publishDateRange | 2014 |
| publishDateSort | 2014 |
| publisher | Department of Electrical Engineering |
| publisherStr | Department of Electrical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/7588 Projection of acoustic fields using the Fourier transform Yudelman, Errol Denbigh, P N A method is presented for projecting acoustic fields using the Fourier transform. It is shown that the source velocity distribution can be represented by a number of sinusoids. Each sinusoid gives rise to a plane wave whose direction is given by the wavelength of the sinusoid. The plane waves are summed at the plane of interest to obtain the resulting pressure field. Errors are introduced when projecting pressure fields by large distances. These are circumvented by observing that the farfield pressure pattern can be found by simply taking the Fourier transform of the nearfield pressure distribution. A rectangular source is simulated on the computer; the Fourier transform technique of projecting fields is compared to a direct integration technique. The Fourier transform technique is used to back project a measured pressure pattern to detect defects on the transducer face. Measurements of pressure are made in the nearfield of a circular transducer. These measurements are forward and back projected to give the pressure and velocity at other planes. 2014-09-22T07:51:13Z 2014-09-22T07:51:13Z 1985 Master Thesis Masters MSc http://hdl.handle.net/11427/7588 eng application/pdf Department of Electrical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Yudelman, Errol Projection of acoustic fields using the Fourier transform |
| thesis_degree_str | Master's |
| title | Projection of acoustic fields using the Fourier transform |
| title_full | Projection of acoustic fields using the Fourier transform |
| title_fullStr | Projection of acoustic fields using the Fourier transform |
| title_full_unstemmed | Projection of acoustic fields using the Fourier transform |
| title_short | Projection of acoustic fields using the Fourier transform |
| title_sort | projection of acoustic fields using the fourier transform |
| url | http://hdl.handle.net/11427/7588 |
| work_keys_str_mv | AT yudelmanerrol projectionofacousticfieldsusingthefouriertransform |