Volume 9, Issue 2
The Oblique Water Entry Impact of a Torpedo and Its Ballistic Trajectory Simulation

Z. Wei, X. Shi & Y. Wang

Int. J. Numer. Anal. Mod., 9 (2012), pp. 312-325

Published online: 2012-09

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  • Abstract
To study the water entry ballistic trajectory of a torpedo, the wind tunnel experiment has been done based on the similarity principle. Then the drag coefficient of the torpedo is got when it enters the water, which is amended by the introduction of continuous supercavitation factor and local cavity effect factor. The vertical plane motion equations are established to get the torpedo's trajectory. The large scale nonlinear transient finite element commercial software MSC. dytran is also used to simulate the initial water entry impact of the Disk-Ogive-Head [1] torpedo, including four special high-speed water entry attitude angles. Then the kinematics parameters as the tail of torpedo submerges in water are input into the motion equation as the initial conditions. Finally, two parts of the data are combined to get the whole kinematic and kinetic parameters. During the calculation, the ballistic modeling uses the cavitation number to determine the torpedo's moving status: in the supercavitation stage, in partial cavity stage or in full wet navigation stage. The simulation results will do reference use to the following trajectory design. In addition, the water impact load and over load calculation of high-speed oblique water entry impact will help to design the intensity of torpedo's shell.
  • Keywords

Water entry MSC. dytran FE simulation torpedo over load trajectory impact drag coefficient

  • AMS Subject Headings

35R35 49J40 60G40

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COPYRIGHT: © Global Science Press

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@Article{IJNAM-9-312, author = {Z. Wei, X. Shi and Y. Wang}, title = {The Oblique Water Entry Impact of a Torpedo and Its Ballistic Trajectory Simulation}, journal = {International Journal of Numerical Analysis and Modeling}, year = {2012}, volume = {9}, number = {2}, pages = {312--325}, abstract = {To study the water entry ballistic trajectory of a torpedo, the wind tunnel experiment has been done based on the similarity principle. Then the drag coefficient of the torpedo is got when it enters the water, which is amended by the introduction of continuous supercavitation factor and local cavity effect factor. The vertical plane motion equations are established to get the torpedo's trajectory. The large scale nonlinear transient finite element commercial software MSC. dytran is also used to simulate the initial water entry impact of the Disk-Ogive-Head [1] torpedo, including four special high-speed water entry attitude angles. Then the kinematics parameters as the tail of torpedo submerges in water are input into the motion equation as the initial conditions. Finally, two parts of the data are combined to get the whole kinematic and kinetic parameters. During the calculation, the ballistic modeling uses the cavitation number to determine the torpedo's moving status: in the supercavitation stage, in partial cavity stage or in full wet navigation stage. The simulation results will do reference use to the following trajectory design. In addition, the water impact load and over load calculation of high-speed oblique water entry impact will help to design the intensity of torpedo's shell.}, issn = {2617-8710}, doi = {https://doi.org/}, url = {http://global-sci.org/intro/article_detail/ijnam/630.html} }
TY - JOUR T1 - The Oblique Water Entry Impact of a Torpedo and Its Ballistic Trajectory Simulation AU - Z. Wei, X. Shi & Y. Wang JO - International Journal of Numerical Analysis and Modeling VL - 2 SP - 312 EP - 325 PY - 2012 DA - 2012/09 SN - 9 DO - http://doi.org/ UR - https://global-sci.org/intro/article_detail/ijnam/630.html KW - Water entry KW - MSC. dytran KW - FE simulation KW - torpedo KW - over load KW - trajectory KW - impact drag coefficient AB - To study the water entry ballistic trajectory of a torpedo, the wind tunnel experiment has been done based on the similarity principle. Then the drag coefficient of the torpedo is got when it enters the water, which is amended by the introduction of continuous supercavitation factor and local cavity effect factor. The vertical plane motion equations are established to get the torpedo's trajectory. The large scale nonlinear transient finite element commercial software MSC. dytran is also used to simulate the initial water entry impact of the Disk-Ogive-Head [1] torpedo, including four special high-speed water entry attitude angles. Then the kinematics parameters as the tail of torpedo submerges in water are input into the motion equation as the initial conditions. Finally, two parts of the data are combined to get the whole kinematic and kinetic parameters. During the calculation, the ballistic modeling uses the cavitation number to determine the torpedo's moving status: in the supercavitation stage, in partial cavity stage or in full wet navigation stage. The simulation results will do reference use to the following trajectory design. In addition, the water impact load and over load calculation of high-speed oblique water entry impact will help to design the intensity of torpedo's shell.
Z. Wei, X. Shi & Y. Wang. (1970). The Oblique Water Entry Impact of a Torpedo and Its Ballistic Trajectory Simulation. International Journal of Numerical Analysis and Modeling. 9 (2). 312-325. doi:
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