Measurement of Added mass of Ships with Unconventional Dimensions
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- OBOKATA Jun
- 住友重機械工業(株)平塚研究所
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- YOSHIMURA Yasuo
- 住友重機械工業(株)平塚研究所
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- SUGITA Matsuji
- 住友重機械工業(株)平塚研究所
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- NAGASHIMA Jitsuro
- 住友重機械工業(株)平塚研究所
Bibliographic Information
- Other Title
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- 主要目が大幅に異なる船型の付加質量について : 定加速度試験(CAT)による付加質量の計測
- シュヨウモク ガ オオハバ ニ コトナル センケイ ノ フカ シツリョウ ニ
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Abstract
For the numerical simulations of manoeuvring slip motions or the slow oscillations of single moored ships, it is necessary to specify the hydrodynamic coefficients in the equation of motion at low frequency. Recently, computer analysis has become to be practical to obtain added mass and other coefficients. However, so-called Motora's chart, which was presented by Motora about twenty years ago, is still available to estimate added mass coefficients because of the simple and practical use of it. Meanwhile, as Motora's chart was produced based on the experiments with conventional type ships of those days, added mass of ships with unconventional dimensions such as recent ultra wide beam ships can not be obtained from the chart. In this report, added mass of several such particular ships are measured by a new model test so-called CAT (Constant Accelerating Test), and the chart is extended to those ships confirming by both model tests and the computer calculations based on three dimensional sourse distribution method. Throught our study, it is found that Motora's chart is still available for such particular ships by means of extrapolating the chart. Also, measured added mass from CAT shows that the added mass at decelerating condition is smaller than that of accelerating condition, which suggests that the different values of added mass have to be used when ship motion is simulated.
Journal
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- Journal of the Kansai Society of Naval Architects, Japan
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Journal of the Kansai Society of Naval Architects, Japan 201 (0), 1-6, 1986
The Japan Society of Naval Architects and Ocean Engineers
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Details 詳細情報について
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- CRID
- 1390001204495112960
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- NII Article ID
- 20000367477
- 110003872823
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- NII Book ID
- AN00349587
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- ISSN
- 2433104X
- 03899101
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- NDL BIB ID
- 3104254
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- CiNii Articles
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- Abstract License Flag
- Disallowed