Air blow guns noise reduction through design and fabrication of a multiple jet nozzle
Background and aims: Discharging compressed air through conventional single jet nozzles or open pipes is a common jet noise in industry. This study is aimed to reduce air blow gun jet noise by designing and fabrication of multiple jet nozzle as a substitute for conventional single jet nozzles. Meth...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Ali Safari Variani [verfasserIn] saeid ahmadi [verfasserIn] sajad zare [verfasserIn] Atefe Sadat Beheshti [verfasserIn] Fatemeh Heidari Abdolahi [verfasserIn] Vida Zaroushani [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Persisch |
| Erschienen: |
2018 |
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| Schlagwörter: |
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| Übergeordnetes Werk: |
In: Salāmat-i kār-i Īrān - Iran University of Medical Sciences, 2017, 15(2018), 3, Seite 11-18 |
|---|---|
| Übergeordnetes Werk: |
volume:15 ; year:2018 ; number:3 ; pages:11-18 |
| Links: |
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DOAJ072706155 |
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| 520 | |a Background and aims: Discharging compressed air through conventional single jet nozzles or open pipes is a common jet noise in industry. This study is aimed to reduce air blow gun jet noise by designing and fabrication of multiple jet nozzle as a substitute for conventional single jet nozzles. Methods: One of the most common commercial air blow gun equipped with a conventional single jet nozzles was considered as a reference. An air Nozzle’s three dimensional model with multiple and smaller openings was designed by solid works software and the designed sketch was fabricated by a three dimensional printer. Noise measurement was made by a Cassella Cell 450 sound level meter with one octave band analyzer. Noise absorption foams were applied to mitigate noise reflection in the testing environment. Air thrust was measured using a digital scale that was placed 30 cm away from nozzle tips. Results: Multiple jet nozzle’s sound pressure level was measured significantly lower than conventional nozzle’s sound pressure level (P Value <0.04). Multiple jet and conventional nozzle’s average sound pressure level in various angles from nozzle axis (30, 90 and 135 degree) was measured to be 75, 76, 76 dB A and 78, 83.3 ,86.3 dB A in pressures of 2,4 and 6 bar respectively. Multiple jet nozzle’s noise reduction in frequencies higher than 500 Hz was significant in comparison with conventional nozzles. Conventional and multiple jet nozzle’s average air thrust in pressures of 2,4 and 6 Bar was measured to be 1.39 and 1.19 N respectively and there was no significant relationship between air thrusts (P Value = 0.7). Conclusion: Multiple jet nozzle with lower noise and the air thrust that is approximately equal to single jet nozzle, can be considered as an appropriate alternative for noise reduction in air blow guns. | ||
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(DE-627)DOAJ072706155 (DE-599)DOAJdf5ceddba1ae4370be6dbb1fe941cdc1 DE-627 ger DE-627 rakwb per Ali Safari Variani verfasserin aut Air blow guns noise reduction through design and fabrication of a multiple jet nozzle 2018 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Background and aims: Discharging compressed air through conventional single jet nozzles or open pipes is a common jet noise in industry. This study is aimed to reduce air blow gun jet noise by designing and fabrication of multiple jet nozzle as a substitute for conventional single jet nozzles. Methods: One of the most common commercial air blow gun equipped with a conventional single jet nozzles was considered as a reference. An air Nozzle’s three dimensional model with multiple and smaller openings was designed by solid works software and the designed sketch was fabricated by a three dimensional printer. Noise measurement was made by a Cassella Cell 450 sound level meter with one octave band analyzer. Noise absorption foams were applied to mitigate noise reflection in the testing environment. Air thrust was measured using a digital scale that was placed 30 cm away from nozzle tips. Results: Multiple jet nozzle’s sound pressure level was measured significantly lower than conventional nozzle’s sound pressure level (P Value <0.04). Multiple jet and conventional nozzle’s average sound pressure level in various angles from nozzle axis (30, 90 and 135 degree) was measured to be 75, 76, 76 dB A and 78, 83.3 ,86.3 dB A in pressures of 2,4 and 6 bar respectively. Multiple jet nozzle’s noise reduction in frequencies higher than 500 Hz was significant in comparison with conventional nozzles. Conventional and multiple jet nozzle’s average air thrust in pressures of 2,4 and 6 Bar was measured to be 1.39 and 1.19 N respectively and there was no significant relationship between air thrusts (P Value = 0.7). Conclusion: Multiple jet nozzle with lower noise and the air thrust that is approximately equal to single jet nozzle, can be considered as an appropriate alternative for noise reduction in air blow guns. jet noise single jet nozzle multiple jet nozzle air blow gun noise reduction Medicine R saeid ahmadi verfasserin aut sajad zare verfasserin aut Atefe Sadat Beheshti verfasserin aut Fatemeh Heidari Abdolahi verfasserin aut Vida Zaroushani verfasserin aut In Salāmat-i kār-i Īrān Iran University of Medical Sciences, 2017 15(2018), 3, Seite 11-18 (DE-627)727420925 (DE-600)2685246-9 22287493 nnns volume:15 year:2018 number:3 pages:11-18 https://doaj.org/article/df5ceddba1ae4370be6dbb1fe941cdc1 kostenfrei http://ioh.iums.ac.ir/article-1-2058-en.html kostenfrei https://doaj.org/toc/1735-5133 Journal toc kostenfrei https://doaj.org/toc/2228-7493 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_206 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2031 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2061 GBV_ILN_2111 GBV_ILN_2190 GBV_ILN_4305 AR 15 2018 3 11-18 |
| spelling |
(DE-627)DOAJ072706155 (DE-599)DOAJdf5ceddba1ae4370be6dbb1fe941cdc1 DE-627 ger DE-627 rakwb per Ali Safari Variani verfasserin aut Air blow guns noise reduction through design and fabrication of a multiple jet nozzle 2018 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Background and aims: Discharging compressed air through conventional single jet nozzles or open pipes is a common jet noise in industry. This study is aimed to reduce air blow gun jet noise by designing and fabrication of multiple jet nozzle as a substitute for conventional single jet nozzles. Methods: One of the most common commercial air blow gun equipped with a conventional single jet nozzles was considered as a reference. An air Nozzle’s three dimensional model with multiple and smaller openings was designed by solid works software and the designed sketch was fabricated by a three dimensional printer. Noise measurement was made by a Cassella Cell 450 sound level meter with one octave band analyzer. Noise absorption foams were applied to mitigate noise reflection in the testing environment. Air thrust was measured using a digital scale that was placed 30 cm away from nozzle tips. Results: Multiple jet nozzle’s sound pressure level was measured significantly lower than conventional nozzle’s sound pressure level (P Value <0.04). Multiple jet and conventional nozzle’s average sound pressure level in various angles from nozzle axis (30, 90 and 135 degree) was measured to be 75, 76, 76 dB A and 78, 83.3 ,86.3 dB A in pressures of 2,4 and 6 bar respectively. Multiple jet nozzle’s noise reduction in frequencies higher than 500 Hz was significant in comparison with conventional nozzles. Conventional and multiple jet nozzle’s average air thrust in pressures of 2,4 and 6 Bar was measured to be 1.39 and 1.19 N respectively and there was no significant relationship between air thrusts (P Value = 0.7). Conclusion: Multiple jet nozzle with lower noise and the air thrust that is approximately equal to single jet nozzle, can be considered as an appropriate alternative for noise reduction in air blow guns. jet noise single jet nozzle multiple jet nozzle air blow gun noise reduction Medicine R saeid ahmadi verfasserin aut sajad zare verfasserin aut Atefe Sadat Beheshti verfasserin aut Fatemeh Heidari Abdolahi verfasserin aut Vida Zaroushani verfasserin aut In Salāmat-i kār-i Īrān Iran University of Medical Sciences, 2017 15(2018), 3, Seite 11-18 (DE-627)727420925 (DE-600)2685246-9 22287493 nnns volume:15 year:2018 number:3 pages:11-18 https://doaj.org/article/df5ceddba1ae4370be6dbb1fe941cdc1 kostenfrei http://ioh.iums.ac.ir/article-1-2058-en.html kostenfrei https://doaj.org/toc/1735-5133 Journal toc kostenfrei https://doaj.org/toc/2228-7493 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_206 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2031 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2061 GBV_ILN_2111 GBV_ILN_2190 GBV_ILN_4305 AR 15 2018 3 11-18 |
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(DE-627)DOAJ072706155 (DE-599)DOAJdf5ceddba1ae4370be6dbb1fe941cdc1 DE-627 ger DE-627 rakwb per Ali Safari Variani verfasserin aut Air blow guns noise reduction through design and fabrication of a multiple jet nozzle 2018 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Background and aims: Discharging compressed air through conventional single jet nozzles or open pipes is a common jet noise in industry. This study is aimed to reduce air blow gun jet noise by designing and fabrication of multiple jet nozzle as a substitute for conventional single jet nozzles. Methods: One of the most common commercial air blow gun equipped with a conventional single jet nozzles was considered as a reference. An air Nozzle’s three dimensional model with multiple and smaller openings was designed by solid works software and the designed sketch was fabricated by a three dimensional printer. Noise measurement was made by a Cassella Cell 450 sound level meter with one octave band analyzer. Noise absorption foams were applied to mitigate noise reflection in the testing environment. Air thrust was measured using a digital scale that was placed 30 cm away from nozzle tips. Results: Multiple jet nozzle’s sound pressure level was measured significantly lower than conventional nozzle’s sound pressure level (P Value <0.04). Multiple jet and conventional nozzle’s average sound pressure level in various angles from nozzle axis (30, 90 and 135 degree) was measured to be 75, 76, 76 dB A and 78, 83.3 ,86.3 dB A in pressures of 2,4 and 6 bar respectively. Multiple jet nozzle’s noise reduction in frequencies higher than 500 Hz was significant in comparison with conventional nozzles. Conventional and multiple jet nozzle’s average air thrust in pressures of 2,4 and 6 Bar was measured to be 1.39 and 1.19 N respectively and there was no significant relationship between air thrusts (P Value = 0.7). Conclusion: Multiple jet nozzle with lower noise and the air thrust that is approximately equal to single jet nozzle, can be considered as an appropriate alternative for noise reduction in air blow guns. jet noise single jet nozzle multiple jet nozzle air blow gun noise reduction Medicine R saeid ahmadi verfasserin aut sajad zare verfasserin aut Atefe Sadat Beheshti verfasserin aut Fatemeh Heidari Abdolahi verfasserin aut Vida Zaroushani verfasserin aut In Salāmat-i kār-i Īrān Iran University of Medical Sciences, 2017 15(2018), 3, Seite 11-18 (DE-627)727420925 (DE-600)2685246-9 22287493 nnns volume:15 year:2018 number:3 pages:11-18 https://doaj.org/article/df5ceddba1ae4370be6dbb1fe941cdc1 kostenfrei http://ioh.iums.ac.ir/article-1-2058-en.html kostenfrei https://doaj.org/toc/1735-5133 Journal toc kostenfrei https://doaj.org/toc/2228-7493 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_206 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2031 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2061 GBV_ILN_2111 GBV_ILN_2190 GBV_ILN_4305 AR 15 2018 3 11-18 |
| allfieldsGer |
(DE-627)DOAJ072706155 (DE-599)DOAJdf5ceddba1ae4370be6dbb1fe941cdc1 DE-627 ger DE-627 rakwb per Ali Safari Variani verfasserin aut Air blow guns noise reduction through design and fabrication of a multiple jet nozzle 2018 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Background and aims: Discharging compressed air through conventional single jet nozzles or open pipes is a common jet noise in industry. This study is aimed to reduce air blow gun jet noise by designing and fabrication of multiple jet nozzle as a substitute for conventional single jet nozzles. Methods: One of the most common commercial air blow gun equipped with a conventional single jet nozzles was considered as a reference. An air Nozzle’s three dimensional model with multiple and smaller openings was designed by solid works software and the designed sketch was fabricated by a three dimensional printer. Noise measurement was made by a Cassella Cell 450 sound level meter with one octave band analyzer. Noise absorption foams were applied to mitigate noise reflection in the testing environment. Air thrust was measured using a digital scale that was placed 30 cm away from nozzle tips. Results: Multiple jet nozzle’s sound pressure level was measured significantly lower than conventional nozzle’s sound pressure level (P Value <0.04). Multiple jet and conventional nozzle’s average sound pressure level in various angles from nozzle axis (30, 90 and 135 degree) was measured to be 75, 76, 76 dB A and 78, 83.3 ,86.3 dB A in pressures of 2,4 and 6 bar respectively. Multiple jet nozzle’s noise reduction in frequencies higher than 500 Hz was significant in comparison with conventional nozzles. Conventional and multiple jet nozzle’s average air thrust in pressures of 2,4 and 6 Bar was measured to be 1.39 and 1.19 N respectively and there was no significant relationship between air thrusts (P Value = 0.7). Conclusion: Multiple jet nozzle with lower noise and the air thrust that is approximately equal to single jet nozzle, can be considered as an appropriate alternative for noise reduction in air blow guns. jet noise single jet nozzle multiple jet nozzle air blow gun noise reduction Medicine R saeid ahmadi verfasserin aut sajad zare verfasserin aut Atefe Sadat Beheshti verfasserin aut Fatemeh Heidari Abdolahi verfasserin aut Vida Zaroushani verfasserin aut In Salāmat-i kār-i Īrān Iran University of Medical Sciences, 2017 15(2018), 3, Seite 11-18 (DE-627)727420925 (DE-600)2685246-9 22287493 nnns volume:15 year:2018 number:3 pages:11-18 https://doaj.org/article/df5ceddba1ae4370be6dbb1fe941cdc1 kostenfrei http://ioh.iums.ac.ir/article-1-2058-en.html kostenfrei https://doaj.org/toc/1735-5133 Journal toc kostenfrei https://doaj.org/toc/2228-7493 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_206 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2031 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2061 GBV_ILN_2111 GBV_ILN_2190 GBV_ILN_4305 AR 15 2018 3 11-18 |
| allfieldsSound |
(DE-627)DOAJ072706155 (DE-599)DOAJdf5ceddba1ae4370be6dbb1fe941cdc1 DE-627 ger DE-627 rakwb per Ali Safari Variani verfasserin aut Air blow guns noise reduction through design and fabrication of a multiple jet nozzle 2018 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Background and aims: Discharging compressed air through conventional single jet nozzles or open pipes is a common jet noise in industry. This study is aimed to reduce air blow gun jet noise by designing and fabrication of multiple jet nozzle as a substitute for conventional single jet nozzles. Methods: One of the most common commercial air blow gun equipped with a conventional single jet nozzles was considered as a reference. An air Nozzle’s three dimensional model with multiple and smaller openings was designed by solid works software and the designed sketch was fabricated by a three dimensional printer. Noise measurement was made by a Cassella Cell 450 sound level meter with one octave band analyzer. Noise absorption foams were applied to mitigate noise reflection in the testing environment. Air thrust was measured using a digital scale that was placed 30 cm away from nozzle tips. Results: Multiple jet nozzle’s sound pressure level was measured significantly lower than conventional nozzle’s sound pressure level (P Value <0.04). Multiple jet and conventional nozzle’s average sound pressure level in various angles from nozzle axis (30, 90 and 135 degree) was measured to be 75, 76, 76 dB A and 78, 83.3 ,86.3 dB A in pressures of 2,4 and 6 bar respectively. Multiple jet nozzle’s noise reduction in frequencies higher than 500 Hz was significant in comparison with conventional nozzles. Conventional and multiple jet nozzle’s average air thrust in pressures of 2,4 and 6 Bar was measured to be 1.39 and 1.19 N respectively and there was no significant relationship between air thrusts (P Value = 0.7). Conclusion: Multiple jet nozzle with lower noise and the air thrust that is approximately equal to single jet nozzle, can be considered as an appropriate alternative for noise reduction in air blow guns. jet noise single jet nozzle multiple jet nozzle air blow gun noise reduction Medicine R saeid ahmadi verfasserin aut sajad zare verfasserin aut Atefe Sadat Beheshti verfasserin aut Fatemeh Heidari Abdolahi verfasserin aut Vida Zaroushani verfasserin aut In Salāmat-i kār-i Īrān Iran University of Medical Sciences, 2017 15(2018), 3, Seite 11-18 (DE-627)727420925 (DE-600)2685246-9 22287493 nnns volume:15 year:2018 number:3 pages:11-18 https://doaj.org/article/df5ceddba1ae4370be6dbb1fe941cdc1 kostenfrei http://ioh.iums.ac.ir/article-1-2058-en.html kostenfrei https://doaj.org/toc/1735-5133 Journal toc kostenfrei https://doaj.org/toc/2228-7493 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_206 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2031 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2061 GBV_ILN_2111 GBV_ILN_2190 GBV_ILN_4305 AR 15 2018 3 11-18 |
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<?xml version="1.0" encoding="UTF-8"?><collection xmlns="http://www.loc.gov/MARC21/slim"><record><leader>01000caa a22002652 4500</leader><controlfield tag="001">DOAJ072706155</controlfield><controlfield tag="003">DE-627</controlfield><controlfield tag="005">20230309111447.0</controlfield><controlfield tag="007">cr uuu---uuuuu</controlfield><controlfield tag="008">230228s2018 xx |||||o 00| ||per c</controlfield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-627)DOAJ072706155</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-599)DOAJdf5ceddba1ae4370be6dbb1fe941cdc1</subfield></datafield><datafield tag="040" ind1=" " ind2=" "><subfield code="a">DE-627</subfield><subfield code="b">ger</subfield><subfield code="c">DE-627</subfield><subfield code="e">rakwb</subfield></datafield><datafield tag="041" ind1=" " ind2=" "><subfield code="a">per</subfield></datafield><datafield tag="100" ind1="0" ind2=" "><subfield code="a">Ali Safari Variani</subfield><subfield code="e">verfasserin</subfield><subfield code="4">aut</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Air blow guns noise reduction through design and fabrication of a multiple jet nozzle</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="c">2018</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">Text</subfield><subfield code="b">txt</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">Computermedien</subfield><subfield code="b">c</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">Online-Ressource</subfield><subfield code="b">cr</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">Background and aims: Discharging compressed air through conventional single jet nozzles or open pipes is a common jet noise in industry. This study is aimed to reduce air blow gun jet noise by designing and fabrication of multiple jet nozzle as a substitute for conventional single jet nozzles. Methods: One of the most common commercial air blow gun equipped with a conventional single jet nozzles was considered as a reference. An air Nozzle’s three dimensional model with multiple and smaller openings was designed by solid works software and the designed sketch was fabricated by a three dimensional printer. Noise measurement was made by a Cassella Cell 450 sound level meter with one octave band analyzer. Noise absorption foams were applied to mitigate noise reflection in the testing environment. Air thrust was measured using a digital scale that was placed 30 cm away from nozzle tips. Results: Multiple jet nozzle’s sound pressure level was measured significantly lower than conventional nozzle’s sound pressure level (P Value <0.04). 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air blow guns noise reduction through design and fabrication of a multiple jet nozzle |
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Air blow guns noise reduction through design and fabrication of a multiple jet nozzle |
| abstract |
Background and aims: Discharging compressed air through conventional single jet nozzles or open pipes is a common jet noise in industry. This study is aimed to reduce air blow gun jet noise by designing and fabrication of multiple jet nozzle as a substitute for conventional single jet nozzles. Methods: One of the most common commercial air blow gun equipped with a conventional single jet nozzles was considered as a reference. An air Nozzle’s three dimensional model with multiple and smaller openings was designed by solid works software and the designed sketch was fabricated by a three dimensional printer. Noise measurement was made by a Cassella Cell 450 sound level meter with one octave band analyzer. Noise absorption foams were applied to mitigate noise reflection in the testing environment. Air thrust was measured using a digital scale that was placed 30 cm away from nozzle tips. Results: Multiple jet nozzle’s sound pressure level was measured significantly lower than conventional nozzle’s sound pressure level (P Value <0.04). Multiple jet and conventional nozzle’s average sound pressure level in various angles from nozzle axis (30, 90 and 135 degree) was measured to be 75, 76, 76 dB A and 78, 83.3 ,86.3 dB A in pressures of 2,4 and 6 bar respectively. Multiple jet nozzle’s noise reduction in frequencies higher than 500 Hz was significant in comparison with conventional nozzles. Conventional and multiple jet nozzle’s average air thrust in pressures of 2,4 and 6 Bar was measured to be 1.39 and 1.19 N respectively and there was no significant relationship between air thrusts (P Value = 0.7). Conclusion: Multiple jet nozzle with lower noise and the air thrust that is approximately equal to single jet nozzle, can be considered as an appropriate alternative for noise reduction in air blow guns. |
| abstractGer |
Background and aims: Discharging compressed air through conventional single jet nozzles or open pipes is a common jet noise in industry. This study is aimed to reduce air blow gun jet noise by designing and fabrication of multiple jet nozzle as a substitute for conventional single jet nozzles. Methods: One of the most common commercial air blow gun equipped with a conventional single jet nozzles was considered as a reference. An air Nozzle’s three dimensional model with multiple and smaller openings was designed by solid works software and the designed sketch was fabricated by a three dimensional printer. Noise measurement was made by a Cassella Cell 450 sound level meter with one octave band analyzer. Noise absorption foams were applied to mitigate noise reflection in the testing environment. Air thrust was measured using a digital scale that was placed 30 cm away from nozzle tips. Results: Multiple jet nozzle’s sound pressure level was measured significantly lower than conventional nozzle’s sound pressure level (P Value <0.04). Multiple jet and conventional nozzle’s average sound pressure level in various angles from nozzle axis (30, 90 and 135 degree) was measured to be 75, 76, 76 dB A and 78, 83.3 ,86.3 dB A in pressures of 2,4 and 6 bar respectively. Multiple jet nozzle’s noise reduction in frequencies higher than 500 Hz was significant in comparison with conventional nozzles. Conventional and multiple jet nozzle’s average air thrust in pressures of 2,4 and 6 Bar was measured to be 1.39 and 1.19 N respectively and there was no significant relationship between air thrusts (P Value = 0.7). Conclusion: Multiple jet nozzle with lower noise and the air thrust that is approximately equal to single jet nozzle, can be considered as an appropriate alternative for noise reduction in air blow guns. |
| abstract_unstemmed |
Background and aims: Discharging compressed air through conventional single jet nozzles or open pipes is a common jet noise in industry. This study is aimed to reduce air blow gun jet noise by designing and fabrication of multiple jet nozzle as a substitute for conventional single jet nozzles. Methods: One of the most common commercial air blow gun equipped with a conventional single jet nozzles was considered as a reference. An air Nozzle’s three dimensional model with multiple and smaller openings was designed by solid works software and the designed sketch was fabricated by a three dimensional printer. Noise measurement was made by a Cassella Cell 450 sound level meter with one octave band analyzer. Noise absorption foams were applied to mitigate noise reflection in the testing environment. Air thrust was measured using a digital scale that was placed 30 cm away from nozzle tips. Results: Multiple jet nozzle’s sound pressure level was measured significantly lower than conventional nozzle’s sound pressure level (P Value <0.04). Multiple jet and conventional nozzle’s average sound pressure level in various angles from nozzle axis (30, 90 and 135 degree) was measured to be 75, 76, 76 dB A and 78, 83.3 ,86.3 dB A in pressures of 2,4 and 6 bar respectively. Multiple jet nozzle’s noise reduction in frequencies higher than 500 Hz was significant in comparison with conventional nozzles. Conventional and multiple jet nozzle’s average air thrust in pressures of 2,4 and 6 Bar was measured to be 1.39 and 1.19 N respectively and there was no significant relationship between air thrusts (P Value = 0.7). Conclusion: Multiple jet nozzle with lower noise and the air thrust that is approximately equal to single jet nozzle, can be considered as an appropriate alternative for noise reduction in air blow guns. |
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Air blow guns noise reduction through design and fabrication of a multiple jet nozzle |
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Multiple jet and conventional nozzle’s average sound pressure level in various angles from nozzle axis (30, 90 and 135 degree) was measured to be 75, 76, 76 dB A and 78, 83.3 ,86.3 dB A in pressures of 2,4 and 6 bar respectively. Multiple jet nozzle’s noise reduction in frequencies higher than 500 Hz was significant in comparison with conventional nozzles. Conventional and multiple jet nozzle’s average air thrust in pressures of 2,4 and 6 Bar was measured to be 1.39 and 1.19 N respectively and there was no significant relationship between air thrusts (P Value = 0.7). 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