Numerical Analysis of Floatplane Porpoising Instability in Calm Water During Takeoff
In the operation of floatplanes, porpoising must be avoided, but it is a common occurrence during takeoff, as it induces longitudinal instability and compromises the safety and comfort of passengers. The mechanism of porpoising and the factors or variables that influence the occurrence of this p...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Universitas Indonesia
2022-01-01
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| Series: | International Journal of Technology |
| Subjects: | |
| Online Access: | https://ijtech.eng.ui.ac.id/article/view/4903 |
| _version_ | 1828082728479752192 |
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| author | Muhammad Hafiz Nurwahyu Aliffrananda Aries Sulisetyono Yuda Apri Hermawan Achmad Zubaydi |
| author_facet | Muhammad Hafiz Nurwahyu Aliffrananda Aries Sulisetyono Yuda Apri Hermawan Achmad Zubaydi |
| author_sort | Muhammad Hafiz Nurwahyu Aliffrananda |
| collection | DOAJ |
| description | In the
operation of floatplanes, porpoising must be avoided, but it is a common
occurrence during takeoff, as it induces longitudinal instability and
compromises the safety and comfort of passengers. The mechanism of porpoising
and the factors or variables that influence the occurrence of this phenomenon
are explored in this study. Based on a review of the literature, the position
of the longitudinal center of gravity (LCG) and the deadrise angle were found
to be the two most significant variables affecting the porpoising phenomenon.
The mechanism of porpoising was simulated using a numerical model based on
computational fluid dynamics (CFD). The simulation findings were then compared
to the results of a related model’s towing tank experiment. With five velocity
differences, a validated computational model was used to analyze the impact of
LCG ordinates and deadrise angles on the frequency of porpoising. Compared to
the LCG 50% length overall (LOA) configuration, the floater with an LCG 53% LOA
configuration caused a higher heave porpoising amplitude by 4% for the floater
with a 10° deadrise angle and 1% for the floater with a 20° deadrise angle at
all speed variations. However, the pitch porpoising amplitude produced by the
floater with an LCG 53% LOA configuration was found to be 4% higher than the
LCG 50% LOA configuration for the floater with a 10° deadrise angle and -1%
higher than the LCG 50% LOA configuration for the floater with a 20° deadrise
angle. The results showed that the higher heave and pitch porpoising amplitude was
generated by a low deadrise angle and a shift in the floater’s center of
gravity toward the bow. |
| first_indexed | 2024-04-11T03:56:27Z |
| format | Article |
| id | doaj.art-92f96d2794994a4597b21a43bc633fd8 |
| institution | Directory Open Access Journal |
| issn | 2086-9614 2087-2100 |
| language | English |
| last_indexed | 2024-04-11T03:56:27Z |
| publishDate | 2022-01-01 |
| publisher | Universitas Indonesia |
| record_format | Article |
| series | International Journal of Technology |
| spelling | doaj.art-92f96d2794994a4597b21a43bc633fd82023-01-02T00:20:55ZengUniversitas IndonesiaInternational Journal of Technology2086-96142087-21002022-01-0113119020110.14716/ijtech.v13i1.49034903Numerical Analysis of Floatplane Porpoising Instability in Calm Water During TakeoffMuhammad Hafiz Nurwahyu Aliffrananda0Aries Sulisetyono1Yuda Apri Hermawan2Achmad Zubaydi3Department of Naval Architecture, Institut Teknologi Sepuluh Nopember, Surabaya 60111, IndonesiaDepartment of Naval Architecture, Institut Teknologi Sepuluh Nopember, Surabaya 60111, IndonesiaDepartment of Naval Architecture, Institut Teknologi Sepuluh Nopember, Surabaya 60111, IndonesiaDepartment of Naval Architecture, Institut Teknologi Sepuluh Nopember, Surabaya 60111, IndonesiaIn the operation of floatplanes, porpoising must be avoided, but it is a common occurrence during takeoff, as it induces longitudinal instability and compromises the safety and comfort of passengers. The mechanism of porpoising and the factors or variables that influence the occurrence of this phenomenon are explored in this study. Based on a review of the literature, the position of the longitudinal center of gravity (LCG) and the deadrise angle were found to be the two most significant variables affecting the porpoising phenomenon. The mechanism of porpoising was simulated using a numerical model based on computational fluid dynamics (CFD). The simulation findings were then compared to the results of a related model’s towing tank experiment. With five velocity differences, a validated computational model was used to analyze the impact of LCG ordinates and deadrise angles on the frequency of porpoising. Compared to the LCG 50% length overall (LOA) configuration, the floater with an LCG 53% LOA configuration caused a higher heave porpoising amplitude by 4% for the floater with a 10° deadrise angle and 1% for the floater with a 20° deadrise angle at all speed variations. However, the pitch porpoising amplitude produced by the floater with an LCG 53% LOA configuration was found to be 4% higher than the LCG 50% LOA configuration for the floater with a 10° deadrise angle and -1% higher than the LCG 50% LOA configuration for the floater with a 20° deadrise angle. The results showed that the higher heave and pitch porpoising amplitude was generated by a low deadrise angle and a shift in the floater’s center of gravity toward the bow.https://ijtech.eng.ui.ac.id/article/view/4903cfddeadrisefloatplaneporpoisingtake-off |
| spellingShingle | Muhammad Hafiz Nurwahyu Aliffrananda Aries Sulisetyono Yuda Apri Hermawan Achmad Zubaydi Numerical Analysis of Floatplane Porpoising Instability in Calm Water During Takeoff International Journal of Technology cfd deadrise floatplane porpoising take-off |
| title | Numerical Analysis of Floatplane Porpoising Instability in Calm Water During Takeoff |
| title_full | Numerical Analysis of Floatplane Porpoising Instability in Calm Water During Takeoff |
| title_fullStr | Numerical Analysis of Floatplane Porpoising Instability in Calm Water During Takeoff |
| title_full_unstemmed | Numerical Analysis of Floatplane Porpoising Instability in Calm Water During Takeoff |
| title_short | Numerical Analysis of Floatplane Porpoising Instability in Calm Water During Takeoff |
| title_sort | numerical analysis of floatplane porpoising instability in calm water during takeoff |
| topic | cfd deadrise floatplane porpoising take-off |
| url | https://ijtech.eng.ui.ac.id/article/view/4903 |
| work_keys_str_mv | AT muhammadhafiznurwahyualiffrananda numericalanalysisoffloatplaneporpoisinginstabilityincalmwaterduringtakeoff AT ariessulisetyono numericalanalysisoffloatplaneporpoisinginstabilityincalmwaterduringtakeoff AT yudaaprihermawan numericalanalysisoffloatplaneporpoisinginstabilityincalmwaterduringtakeoff AT achmadzubaydi numericalanalysisoffloatplaneporpoisinginstabilityincalmwaterduringtakeoff |