非対称形ロケット構造振動特性の簡易解析法の研究 : ヨー曲げ振動/ロールねじり振動連成の場合

概要

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A simplified analysis method is proposed to obtain eigenfrequencies and modes for yaw-bending and roll-torsional structural vibration of an asymmetric configuration rocket. The author has already proposed a simplified analysis method for axial-pitch coupling vibration of an asymmetric configuration rocket. The present method can analyze the other coupling vibration, that is yaw-roll coupling vibration for an asymmetric configuration rocket by asymmetric beam elements. The purpose of this simplified analysis method using a FORTRAN 77 program is also to prepare an analysis tool for studying on yaw-roll coupling effects in the preliminary design phase and a rough-check tool of detailed analysis. This program can generate yaw-roll coupling stiffness and mass matrices by the offset asymmetric beam element with linearly changing sectional properties using the Timoshenko-type beam theory. A sample structural vibration analysis of a hypothetical rocket with an asymmetric configuration demonstrates the capability of this simplified method. The results obtained agree well with those obtained by MSC/NASTRAN analysis, and this proposed method enables great simplification of model preparation. Based on these findings, the proposed method is judged to be an efficient structural vibration analysis tool of an asymmetric rocket.
1999-04-25