Abstract
A simplified analytical method is proposed to obtain eigenfrequencies and modes of a rocket with an asymmetric configuration. This method is an extension of the symmetric beam element matrix method and utilizes asymmetric beam elements. The purpose of this simplified analysis using a FORTRAN 77 program is to prepare an analytical tool for the preliminary design phase and a rough-check tool for detailed analysis. This program has three functions: (1) to generate stiffness and mass matrices for the asymmetric beam element using Timoshenko-type beam theory, 2) to calculate the dynamical matrix from which rigid body degrees of freedom are eliminated, and ( 3 ) to calculate eigenvalues and eigenvectors. A sample analysis of the structural vibrations in a hypothetical rocket with an asymmetric configuration is conducted to demonstrate the capability of this simplified method. The results obtained agree well with those obtained by MSC/NASTRAN analysis, and this proposed method greatly simplifies the preparation of a model. Based on these findings, the proposed method is judged to be an efficient tool for the analysis of structural vibrations in an asymmetric rocket.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
