On Certain Practical Issues Relating to Construction of the In-duct Single Mode Synthesizer
It is convenient to have a device and a method of generating single cut-on modes in cylindrical hard-walled waveguides or at least in laboratory models of such systems. This allows to examine, among other things, properties of various active and/or passive elements inserted in a cylindrical duct by...
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| Format: | Article |
| Language: | English |
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Institute of Fundamental Technological Research Polish Academy of Sciences
2015-04-01
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| Series: | Archives of Acoustics |
| Subjects: | |
| Online Access: | https://acoustics.ippt.pan.pl/index.php/aa/article/view/1539 |
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| _version_ | 1849318511174746112 |
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| author | Łukasz GORAZD Anna SNAKOWSKA Jerzy JURKIEWICZ Artur FLACH |
| author_facet | Łukasz GORAZD Anna SNAKOWSKA Jerzy JURKIEWICZ Artur FLACH |
| author_sort | Łukasz GORAZD |
| collection | DOAJ |
| description | It is convenient to have a device and a method of generating single cut-on modes in cylindrical hard-walled waveguides or at least in laboratory models of such systems. This allows to examine, among other things, properties of various active and/or passive elements inserted in a cylindrical duct by testing them in conditions when the incident (input) wave comprises only one cut-on mode and determining the reflection and transmission coefficients for single selected incident modes. As it has been already demonstrated by the present authors, it is possible to generate single cut-on modes in a circular duct using a small (although increasing with mode order) number of acoustic monopoles arranged properly on a duct cross-section and driven with appropriate acoustic volume amplitudes and phases. Laboratory models of such sources are proposed in this paper and results of tests verifying their directional properties are presented. The other technical issue relating to practical utilization of the proposed method is the possible error introduced by the apparatus used for scanning the acoustic field inside the duct model. It is shown that insertion of the measuring probe changes the total energy radiated into the free space only by a fraction of a decibel. |
| format | Article |
| id | doaj-art-edb127fe2ae54eac8547f883bb90a0a8 |
| institution | Kabale University |
| issn | 0137-5075 2300-262X |
| language | English |
| publishDate | 2015-04-01 |
| publisher | Institute of Fundamental Technological Research Polish Academy of Sciences |
| record_format | Article |
| series | Archives of Acoustics |
| spelling | doaj-art-edb127fe2ae54eac8547f883bb90a0a82025-08-20T03:50:48ZengInstitute of Fundamental Technological Research Polish Academy of SciencesArchives of Acoustics0137-50752300-262X2015-04-0140210.1515/aoa-2015-0027On Certain Practical Issues Relating to Construction of the In-duct Single Mode SynthesizerŁukasz GORAZD0Anna SNAKOWSKA1Jerzy JURKIEWICZ2Artur FLACH3AGH University of Science and TechnologyAGH University of Science and TechnologyAGH University of Science and TechnologyAGH University of Science and TechnologyIt is convenient to have a device and a method of generating single cut-on modes in cylindrical hard-walled waveguides or at least in laboratory models of such systems. This allows to examine, among other things, properties of various active and/or passive elements inserted in a cylindrical duct by testing them in conditions when the incident (input) wave comprises only one cut-on mode and determining the reflection and transmission coefficients for single selected incident modes. As it has been already demonstrated by the present authors, it is possible to generate single cut-on modes in a circular duct using a small (although increasing with mode order) number of acoustic monopoles arranged properly on a duct cross-section and driven with appropriate acoustic volume amplitudes and phases. Laboratory models of such sources are proposed in this paper and results of tests verifying their directional properties are presented. The other technical issue relating to practical utilization of the proposed method is the possible error introduced by the apparatus used for scanning the acoustic field inside the duct model. It is shown that insertion of the measuring probe changes the total energy radiated into the free space only by a fraction of a decibel.https://acoustics.ippt.pan.pl/index.php/aa/article/view/1539circular hard-walled ductmodal structurecut-on modecircular duct modeling |
| spellingShingle | Łukasz GORAZD Anna SNAKOWSKA Jerzy JURKIEWICZ Artur FLACH On Certain Practical Issues Relating to Construction of the In-duct Single Mode Synthesizer Archives of Acoustics circular hard-walled duct modal structure cut-on mode circular duct modeling |
| title | On Certain Practical Issues Relating to Construction of the In-duct Single Mode Synthesizer |
| title_full | On Certain Practical Issues Relating to Construction of the In-duct Single Mode Synthesizer |
| title_fullStr | On Certain Practical Issues Relating to Construction of the In-duct Single Mode Synthesizer |
| title_full_unstemmed | On Certain Practical Issues Relating to Construction of the In-duct Single Mode Synthesizer |
| title_short | On Certain Practical Issues Relating to Construction of the In-duct Single Mode Synthesizer |
| title_sort | on certain practical issues relating to construction of the in duct single mode synthesizer |
| topic | circular hard-walled duct modal structure cut-on mode circular duct modeling |
| url | https://acoustics.ippt.pan.pl/index.php/aa/article/view/1539 |
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