Paper Title

Abstract - Spacecraft should endure acoustic loads during launch. While the SPL (Sound Pressure Level) may change during launch vehicle system test period, predicting the structure response for various acoustic loads is helpful to estimate the structural strength. TRITON Satellite was excused a high intensity acoustic test in a reverberant chamber in the final stage of integration and test. This paper will mention the SEA (Statistical Energy Analysis) method to predict the structure response for acoustic excitation at high frequency period with different SPL, the acoustic methodology and compare the predicted responses with test results that make sure the structure can endure the acoustic loads.The objective of TRITON satellite acoustic test was to verify the ability of the avionics and structure to endure the broadband acoustic environment experienced within the launch vehicle payload fairing. While the acoustic spectrum from launch vehicle changed several times, the prediction is useful to decrease the test times. The TRITON satellite was tested in the reverberant chamber at overall sound pressure level. The spectrum control system of the acoustic test facility used eight control microphones to maintain target spectrum levels within tolerances. The dynamic response was measured by many accelerations installed on the critical locations of the TRITOM satellite. The acoustic response of the TRITON satellite was also predicted based on a finite element model and SEA analysis to identify the critical components with a protoflight acoustic test based on the specified launch vehicle spectrum. The analysis method used to predict the responses combines the MSC/NASTRAN solver and SEA+, an acoustic simulation software from Siemens. Responses of many locations were compared with the predictions in critical locations such as the solar arrays. Because of the time limit and cost constraints in a satellite development program, it is significantto perform both acoustic tests as well as predictions by analysis in an efficient manner to validate structural designs of a spacecraft. Keywords: Statistical Energy Analysis (SEA), Acoustic, FEM, Payload Fairing, TRITON satellite