Here is a link to a PDF on "Dynamics and Simulation of Flexible Rockets": https://nptel.ac.in/courses/101/102/101102003/lecture-notes-pdf/LN-Flexible-Rockets.pdf
Here is a link to a PDF on "Dynamics and Simulation of Flexible Rockets": https://nptel.ac.in/courses/101/102/101102003/lecture-notes-pdf/LN-Flexible-Rockets.pdf