内圧負荷を受けるロケット・タンクの流体/構造連成軸対称振動の簡易解析法の研究

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概要

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• A simplified method is proposed to obtain eigenfrequencies and modes for an axisymmetric vibration of a pressurized tank of a rocket filled with liquid propellant. The purpose of this simplified method is to prepare a simplified analysis tool in the preliminary design phase and to use as a pilot analysis for the detailed analysis in the development phase. To this end, present method can treat fluid-structure interaction and can analyze the effects of tank pressurization. POGO prevention is a classical problem in design of a large liquid rocket such as the US Space Shuttle and the Japanese H II rocket. In particular, axisymmetric modes in longitudinal vibrations of the vehicle are important for POGO stability analysis because they have potential instability coupled with propulsion system dynamics. Consequently, proposed simplified method enables axisymmetric vibration analysis of shells of revolution using a FORTRAN 77 program, which has the following three capabilities; (1) Finite Strip Method (FSM) structural vibration analysis for a pressurized tank, (2) Boundary Element Method (BEM) sloshing vibration analysis for liquid propellant, (3) fluid-structure coupled vibration analysis. Structural vibration analysis on a hemispherical tank has verified accuracy of this simplified method, and also demonstrated the capability of this simplified method. Based on these demonstration analyses, the proposed method is judged to be an efficient structural vibration analysis method of a pressurized tank of a rocket filled with liquid propellant.

• 一般社団法人日本機械学会の論文
• 1999-08-25

著者

• 幸節 雄二

  (株)ロケットシステム

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• 内圧負荷を受けるロケット・タンクの流体/構造連成軸対称振動の簡易解析法の研究

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