Modal Testing of the NASA VIPER Spacecraft Using Acoustic Excitation

The environmental testing phase of the NASA Volatiles Investigating Polar Exploration Rover (VIPER) spacecraft presented a unique opportunity to compare traditional and experimental modal testing methods. This paper provides a background for the method of acoustic excitation, including special considerations that were made in preparation for the modal measurements. The modal extraction method for the acoustic excitation method is explored. The results are compared to a modal test of the VIPER structure using the fixed base correction technique to validate the approach. Finally, conclusions are made regarding acceptable use cases and considerations for such a test.