Modal Parameter Identification of ATV STM Using Modal and Base Excitation Approaches

Details Modal Parameter Identification of ATV STM Using Modal and Base Excitation Approaches Modal Parameter Identification of ATV STM Using Modal and Base Excitation Approaches

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.558..609w&link_type=abstract

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

Mathematics

Scientific paper

In 2002, a modal survey and a dynamic qualification test were performed on the structural-thermal model (STM) of the Automated Transfer Vehicle (ATV). These tests were conducted by the European Test Services (ETS) with support of IABG at the test facilities of ESTEC in Noordwijk by order of EADS ST. In order to minimize test duration and set-up complexity, the dynamic qualification test and a classical modal test were planned to be performed within one combined test campaign. The objectives of these tests were the experimental dynamic characteri- zation of the ATV STM structure and its qualification with respect to the ARIANE 5 flight loads.. The results of this dynamic characterization had to be used to verify, respectively to update the mathematical models. This paper focuses on the modal characterisation aspects of these tests. Considering the excitability of the vibration modes of this large test article and the demand to accomplish the modal survey and qualification test in very short time, it was foreseen to combine the modal and the vibration test in a manner, such that with minimum effort, an optimum of modal characterisation could be achieved. In the first part of the test campaign, with its main objective to determine the modal parameters of the lateral ATV modes, the ATV STM was excited by using locally distributed electrodynamic shakers. The modal parameters were determined by applying tuned sine excitation and in addition by a modal analysis of the measured frequency response functions. In the second test sequence, in which the qualification test was performed, the ATV STM was mounted onto the HYDRA vibration test facility. The modal parameter identification for mainly the longitudinal ATV modes was performed by using modal analysis of the recorded structural responses resulting from the applied longitudinal base excitation. Also, the responses of the lateral vibration tests were available for a modal analysis. This paper describes the test set-ups and procedures, which were applied in this combined approach to determine the modal parameters of the ATV.. In particular, the advantages and disadvantages of both excitation methods are addressed with respect to the test objectives and the updating process of the mathematical models.

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