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<p>The impact force effect on launch platform motion response represents a critical safety consideration that requires thorough investigation prior to sea-launch implementation. This paper examines a self-designed semi-submersible launch platform comprising a box-shaped deck, six columns, and two pontoons, with sufficient structural stiffness to be analyzed as a rigid body. A proprietary code based on three-dimensional linear potential theory was developed for hydrodynamic analysis of the launching process. The Cummins equation was implemented to calculate platform responses under substantial impact force. The numerical results were validated through comparison with ANSYS/Aqwa commercial software for platform motion response in both launch and non-launch cases. Additionally, two model tests were conducted in a sea-keeping wave basin at a scale ratio of <i>λ</i> =1:40. The numerical results demonstrated good agreement with experimental data. Both numerical and experimental findings indicate that platform motion responses result from wave-induced effects and impact force/rocket weight effects, with the latter typically predominant. Numerical simulations revealed that in moderate sea states, maximum heave and pitch motions measure 0.6 m and 1°, respectively, suggesting the viability of sea-launch operations using the designed platform under these conditions.</p>

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Numerical and Experimental Study on the Motion Response of a Sea-Launch Platform Under High Impact Force

  • 期刊论文

  • 发表日期：

    2025年12月27日

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  • Chun-mei Xie,
  • Jun-cheng Yang,
  • Xiao-ming Cheng,
  • Jun Yu,
  • Ze Wang,
  • Zhi-qi Tao,
  • Zhen Lu,
  • Feng Xiao,
  • Xin-yun Ni

摘要

The impact force effect on launch platform motion response represents a critical safety consideration that requires thorough investigation prior to sea-launch implementation. This paper examines a self-designed semi-submersible launch platform comprising a box-shaped deck, six columns, and two pontoons, with sufficient structural stiffness to be analyzed as a rigid body. A proprietary code based on three-dimensional linear potential theory was developed for hydrodynamic analysis of the launching process. The Cummins equation was implemented to calculate platform responses under substantial impact force. The numerical results were validated through comparison with ANSYS/Aqwa commercial software for platform motion response in both launch and non-launch cases. Additionally, two model tests were conducted in a sea-keeping wave basin at a scale ratio of λ =1:40. The numerical results demonstrated good agreement with experimental data. Both numerical and experimental findings indicate that platform motion responses result from wave-induced effects and impact force/rocket weight effects, with the latter typically predominant. Numerical simulations revealed that in moderate sea states, maximum heave and pitch motions measure 0.6 m and 1°, respectively, suggesting the viability of sea-launch operations using the designed platform under these conditions.