PREDICTION AND VALIDATION OF HIGH FREQUENCY VIBRATION RESPONSES OF NASA MARS PATHFINDER SPACECRAFT DUE TO ACOUSTIC LAUNCH LOAD USING STATISTICAL ENERGY ANALYSIS

摘要

Mid and high frequency structural responses of a spacecraft during the launch condition arernmainly dominated by the intense acoustic pressure field over the exterior of the launch vehicle. Thernprediction of structural responses due to the acoustic launch load is therefore an important analysis forrnengineers and scientists to correctly define various dynamics specifications of the spacecraft. ArnStatistical Energy Analysis model of the NASA’s Mars Pathfinder spacecraft has been developed tornobtain high frequency structural responses due to the acoustic launch load up to 2,000 Hz. The predictedrnstructural responses of the spacecraft have been correlated with the test data obtained at Jet PropulsionrnLaboratory’s acoustic reverberation chamber. Overall good agreements have been found between thernSEA responses and acoustic test data in high frequencies.