Modal Survey Tests on HYDRA Dummy Payloads.

Abstract

The new multi-axis vibration test facility HYDRA was built at ESTEC in 1996. For the verification of HYDRA's dynamic performances, two dummy payloads, the so-called HYDRA dummy and the Polar Platform (PPF) dummy have been designed. In order to provide the HYDRA control performance verfication experiments with reference data, a modal survey test was performed on both dummy test specimens. The report describes the modal survey tests, summarizes the test results,and recommends further steps in the HYDRA verification procedure.