A coherent image source method for flat waveguides with locally reacting boundaries
An image source method is presented for coherently evaluating the sound field from a point source in flat waveguides with two infinite and parallel locally reacting boundaries, where one is sound absorbing and the other is reflective....
| Main Authors: | , , |
|---|---|
| Other Authors: | |
| Format: | Conference Paper |
| Language: | English |
| Published: |
2011
|
| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/93841 http://hdl.handle.net/10220/7076 http://www.acoustics.asn.au/conference_proceedings/ICA2010/cdrom-ICA2010/papers/p386.pdf |
| _version_ | 1824454417811767296 |
|---|---|
| author | Min, Hequn. Qiu, Xiaojun. Li, Ningrong. |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Min, Hequn. Qiu, Xiaojun. Li, Ningrong. |
| author_sort | Min, Hequn. |
| collection | NTU |
| description | An image source method is presented for coherently evaluating the sound field from a point source in flat waveguides
with two infinite and parallel locally reacting boundaries, where one is sound absorbing and the other is reflective.
The method starts from formulating sound reflections into integrals by plane wave expansion, and the inherent intractability
in solving these integrals in such spaces is avoided by introducing a physically plausible assumption that
wave fronts remain the same before and after the reflection on a near-rigid boundary. By comparisons to the classical
wave theory and the existing coherent ray-based methods, it is shown that the proposed method is considerably accurate
to predict the sound propagation in flat waveguides with a sound absorbing ceiling and a reflective floor over a
broad frequency range and for various source/receiver geometries, even if at large distances from the source compared
to the waveguide height while the existing methods are shown to be erroneous. |
| first_indexed | 2025-02-19T03:21:59Z |
| format | Conference Paper |
| id | ntu-10356/93841 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:21:59Z |
| publishDate | 2011 |
| record_format | dspace |
| spelling | ntu-10356/938412023-03-04T17:08:08Z A coherent image source method for flat waveguides with locally reacting boundaries Min, Hequn. Qiu, Xiaojun. Li, Ningrong. School of Mechanical and Aerospace Engineering International Congress on Acoustics (20th : 2010 : Sydney, Australia) DRNTU::Science::Physics::Acoustics and sound An image source method is presented for coherently evaluating the sound field from a point source in flat waveguides with two infinite and parallel locally reacting boundaries, where one is sound absorbing and the other is reflective. The method starts from formulating sound reflections into integrals by plane wave expansion, and the inherent intractability in solving these integrals in such spaces is avoided by introducing a physically plausible assumption that wave fronts remain the same before and after the reflection on a near-rigid boundary. By comparisons to the classical wave theory and the existing coherent ray-based methods, it is shown that the proposed method is considerably accurate to predict the sound propagation in flat waveguides with a sound absorbing ceiling and a reflective floor over a broad frequency range and for various source/receiver geometries, even if at large distances from the source compared to the waveguide height while the existing methods are shown to be erroneous. Published version 2011-09-15T08:45:57Z 2019-12-06T18:46:30Z 2011-09-15T08:45:57Z 2019-12-06T18:46:30Z 2010 2010 Conference Paper Min, H., Qiu, X., & Li, N. (2010). A coherent image source method for flat waveguides with locally reacting boundaries. Proceedings of 20th International Congress on Acoustics, ICA 2010, Sydney, Australia. https://hdl.handle.net/10356/93841 http://hdl.handle.net/10220/7076 http://www.acoustics.asn.au/conference_proceedings/ICA2010/cdrom-ICA2010/papers/p386.pdf 160062 en © 2010 Australian Acoustical Society. This paper was published in Proceedings of 20th International Congress on Acoustics, ICA 2010 and is made available as an electronic reprint (preprint) with permission of Australian Acoustical Society. The paper can be found at the following official URL: http://www.acoustics.asn.au/conference_proceedings/ICA2010/cdrom-ICA2010/papers/p386.pdf. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law. 8 p. application/pdf |
| spellingShingle | DRNTU::Science::Physics::Acoustics and sound Min, Hequn. Qiu, Xiaojun. Li, Ningrong. A coherent image source method for flat waveguides with locally reacting boundaries |
| title | A coherent image source method for flat waveguides with locally reacting boundaries |
| title_full | A coherent image source method for flat waveguides with locally reacting boundaries |
| title_fullStr | A coherent image source method for flat waveguides with locally reacting boundaries |
| title_full_unstemmed | A coherent image source method for flat waveguides with locally reacting boundaries |
| title_short | A coherent image source method for flat waveguides with locally reacting boundaries |
| title_sort | coherent image source method for flat waveguides with locally reacting boundaries |
| topic | DRNTU::Science::Physics::Acoustics and sound |
| url | https://hdl.handle.net/10356/93841 http://hdl.handle.net/10220/7076 http://www.acoustics.asn.au/conference_proceedings/ICA2010/cdrom-ICA2010/papers/p386.pdf |
| work_keys_str_mv | AT minhequn acoherentimagesourcemethodforflatwaveguideswithlocallyreactingboundaries AT qiuxiaojun acoherentimagesourcemethodforflatwaveguideswithlocallyreactingboundaries AT liningrong acoherentimagesourcemethodforflatwaveguideswithlocallyreactingboundaries AT minhequn coherentimagesourcemethodforflatwaveguideswithlocallyreactingboundaries AT qiuxiaojun coherentimagesourcemethodforflatwaveguideswithlocallyreactingboundaries AT liningrong coherentimagesourcemethodforflatwaveguideswithlocallyreactingboundaries |