Simulation of Launch Vehicle Dynamics on an Interstage Structure

Flying a rover from low earth orbit to the surface of the moon requires an interstage structure. This interstage structure serves two main purposes: to contain the rocket motors used for trans lunar injection and braking, and to support the lander and rover inside the launch vehicle payload fairing. The interstage is subject to various forces imposed by the launch vehicle, and must be designed to endure these loads. This paper describes an analysis of the interstage geometry. Computer simulation is used to test the interstage structure’s behavior when subjected to acceleration loads and random vibrations, and to determine its modes of vibration. The results are compared to launch vehicle guidelines and other specifications. It has been determined that the current interstage geometry constructed of 40 layers of carbon fiber provides adequate strength to support acceleration loads and meets natural frequency requirements.