Hexapod Mechanical Assembly modal survey test

Details Hexapod Mechanical Assembly modal survey test Hexapod Mechanical Assembly modal survey test

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.558..165o&link_type=abstract

Proceedings of the 5th International Symposium on Environmental Testing for Space Programmes Noordwijk, The Netherlands (ESA SP-

Computer Science

Scientific paper

In the frame of the ESA Hexapod project phase C/D, Carlo Gavazzi Space and Politecnico di Milano under a contract with ALENIA SPAZIO performed the modal survey test of the flight unit of the Hexapod Mechanical Assembly (HMA). Hexapod is a high accuracy and stability pointing system designed to point NASA's Stratospheric Aerosol and Gas Experiment SAGE III at the Earth to monitor the global distribution of aerosols and gaseous constituents in the atmosphere. Several environmental test verification activities on the Hexapod Mechanical Assembly (HMA) are foreseen, ranging from thermal-vacuum to lubrication/lifetime, and vibration testing. Most of these tests have already been performed on the HMA single actuators, six of them building the complete assembly, and the first test performed on the complete HMA is the Modal Survey testing with a dynamic simulator of SAGE III sensor installed. This test was performed at Politecnico di Milano facility for modal survey testing inside a 100.000 class cleanroom. Modal analysis and test was performed for the HMA in 3 different configurations, ranging from launch configuration to nominal and contingency reentry. The paper describes the performed prediction activities based on FEM analysis and the experimental modal analysis techniques used for the correlation and updating of the HMA finite element model that shall be used for dynamic behavior prediction both during random vibration proto-qualification test and during launch when integrated on the carrier pallet.

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