Correction of water-penetrating velocity attenuation formula for “Pie” fragment
<b>[Objectives]</b>Fragment is the key object of vessel liquid tank protection, and the study on the water-penetrating velocity attenuation characteristic of the high-speed "pie" fragment can provide theoretical reference for the protection analysis and optimization of the vess...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Editorial Office of Chinese Journal of Ship Research
2019-06-01
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| Series: | Zhongguo Jianchuan Yanjiu |
| Subjects: | |
| Online Access: | http://www.ship-research.com/EN/Y2019/V14/I3/51 |
| _version_ | 1819297946521305088 |
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| author | Zhang Lei Gao Songlin Li Xiaobin Li Siyu Du Zhipeng |
| author_facet | Zhang Lei Gao Songlin Li Xiaobin Li Siyu Du Zhipeng |
| author_sort | Zhang Lei |
| collection | DOAJ |
| description | <b>[Objectives]</b>Fragment is the key object of vessel liquid tank protection, and the study on the water-penetrating velocity attenuation characteristic of the high-speed "pie" fragment can provide theoretical reference for the protection analysis and optimization of the vessel liquid tank.<b>[Methods]</b>First to consider the change in resistance coefficient during water-penetrating process of fragment,the classical theoretical formula is modified by introducing the empirical coefficient <i>a</i> and <i>b</i>. Then, numerical simulation method is used to simulate the water-penetrating process of fragment,and the simulation results are compared with the calculation results from classical theoretical formula and improved formula. Finally,the influences of the initial velocity and slenderness ratio on the fragment penetration velocity attenuation are studied by the empirical coefficient <i>a</i> and <i>b</i>.<b>[Results]</b> The improved formula is more suitable than the classical formula to study the attenuation characteristics of the water-penetrating velocity of the "pie" fragment. The resistance coefficient is related to the slenderness ratio:when the slenderness ratio is less than 0.5,the resistance coefficient is greatly affected by the change of the penetration distance;when the slenderness ratio is greater than 0.5,the resistance coefficient is less affected by the change of the penetration distance, and the resistance coefficient can be treated as a constant.<b>[Conclusions]</b>The protective effect of vessel liquid tank on "pie" fragment can be calculated simply by using the improved theoretical formula in this paper. |
| first_indexed | 2024-12-24T05:22:05Z |
| format | Article |
| id | doaj.art-1b827c3398e34ee7a654c4c5eed10963 |
| institution | Directory Open Access Journal |
| issn | 1673-3185 1673-3185 |
| language | English |
| last_indexed | 2024-12-24T05:22:05Z |
| publishDate | 2019-06-01 |
| publisher | Editorial Office of Chinese Journal of Ship Research |
| record_format | Article |
| series | Zhongguo Jianchuan Yanjiu |
| spelling | doaj.art-1b827c3398e34ee7a654c4c5eed109632022-12-21T17:13:26ZengEditorial Office of Chinese Journal of Ship ResearchZhongguo Jianchuan Yanjiu1673-31851673-31852019-06-01143515710.19693/j.issn.1673-3185.01264201903007Correction of water-penetrating velocity attenuation formula for “Pie” fragmentZhang Lei0Gao Songlin1Li Xiaobin2Li Siyu3Du Zhipeng4Naval Research Academy, Beijing 100161, ChinaNaval Research Academy, Beijing 100161, ChinaSchool of Transportation, Wuhan University of Technology, Wuhan 430063, ChinaSchool of Transportation, Wuhan University of Technology, Wuhan 430063, ChinaNaval Research Academy, Beijing 100161, China<b>[Objectives]</b>Fragment is the key object of vessel liquid tank protection, and the study on the water-penetrating velocity attenuation characteristic of the high-speed "pie" fragment can provide theoretical reference for the protection analysis and optimization of the vessel liquid tank.<b>[Methods]</b>First to consider the change in resistance coefficient during water-penetrating process of fragment,the classical theoretical formula is modified by introducing the empirical coefficient <i>a</i> and <i>b</i>. Then, numerical simulation method is used to simulate the water-penetrating process of fragment,and the simulation results are compared with the calculation results from classical theoretical formula and improved formula. Finally,the influences of the initial velocity and slenderness ratio on the fragment penetration velocity attenuation are studied by the empirical coefficient <i>a</i> and <i>b</i>.<b>[Results]</b> The improved formula is more suitable than the classical formula to study the attenuation characteristics of the water-penetrating velocity of the "pie" fragment. The resistance coefficient is related to the slenderness ratio:when the slenderness ratio is less than 0.5,the resistance coefficient is greatly affected by the change of the penetration distance;when the slenderness ratio is greater than 0.5,the resistance coefficient is less affected by the change of the penetration distance, and the resistance coefficient can be treated as a constant.<b>[Conclusions]</b>The protective effect of vessel liquid tank on "pie" fragment can be calculated simply by using the improved theoretical formula in this paper.http://www.ship-research.com/EN/Y2019/V14/I3/51“pie” fragmentslenderness ratiovelocity attenuationresistance coefficient |
| spellingShingle | Zhang Lei Gao Songlin Li Xiaobin Li Siyu Du Zhipeng Correction of water-penetrating velocity attenuation formula for “Pie” fragment Zhongguo Jianchuan Yanjiu “pie” fragment slenderness ratio velocity attenuation resistance coefficient |
| title | Correction of water-penetrating velocity attenuation formula for “Pie” fragment |
| title_full | Correction of water-penetrating velocity attenuation formula for “Pie” fragment |
| title_fullStr | Correction of water-penetrating velocity attenuation formula for “Pie” fragment |
| title_full_unstemmed | Correction of water-penetrating velocity attenuation formula for “Pie” fragment |
| title_short | Correction of water-penetrating velocity attenuation formula for “Pie” fragment |
| title_sort | correction of water penetrating velocity attenuation formula for pie fragment |
| topic | “pie” fragment slenderness ratio velocity attenuation resistance coefficient |
| url | http://www.ship-research.com/EN/Y2019/V14/I3/51 |
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