Design and analysis of vibration test bed fixtures for space launch vehicles

Space Launch Vehicles are subjected to rigor dynamic environment during lift-off and ascent phase of launch. The intense sound generated by the rocket propulsion system exerts significant acoustic pressure which induces vibrations. In addition, intense vibrations are generated by space propulsion engine ignitions, shut downs, sudden transient shocks generated by solid rocket motors and separation of stages. The vibration testing poses a challenge to design and realize good vibration test fixture. Launch vehicles have to undergo vibration testing prior to launch for its design qualification and flight acceptance. Vibration testing requires a fixture to interface the specimen and vibration generating equipment. This paper briefly describes the design criticalities, analysis and material considerations and structural dynamic modifications to ensure good vibration environment simulation to launch vehicle structures.