Liftoff vibro-acoustic analysis of upper stage of small launch vehicle
- Paper number
IAC-05-C2.2.07
- Author
Dr. Soon-Hong Park, Korea Aerospace Research Institute, Korea
- Year
2005
- Abstract
Liftoff acoustic loads (more than 150dB) cause severe random vibrations on electronic equipments and solar panels of a satellite. This excessive random vibration often breaks down the payloads so that it causes the failure of mission. Appropriate prediction and reduction methods of the vibration level greatly reduce the potential mission failure. In this paper random vibration level was predicted by statistical energy analysis (SEA) method. In order to verify the modeling procedure for our new small launch vehicle, SEA model of sub scale payload section was verified by experimental way: The predicted level was compared with the measured one by the high intensity acoustic test. This paper also states that a method to reduce the random vibration level by reducing the acoustic level inside the payload fairing. Several acoustic blankets were designed and its insertion losses were measured. The measured IL and the vibro-acoustic model enable us to predict the random vibration level at liftoff phase. The results showed that the vibration level on the payload can be greatly reduced by virtue of the acoustic blankets.
- Abstract document