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Füllekrug, U. and Sinapius, M. (1997) On the feasibility of Replacing Base Excitation by Modal Forces in Qualification Testing - A Case Study on the PPF Satellite. In: Proceedings of the 3rd International Symposium on Environmental Testing for Space Programmes, ESA SP-408, 1997., pp. 91-97. 3rd International Symposium on Environmental Testing for Space Programmes, 1997.
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Abstract
The conventional dynamic qualification of space structures requires the availability of base-driven vibration test facilities. For large and unwieldy structures which cannot be tested by base excitation, an alternative approach, the modal force combination method, can be utilised. The method employs special multi-point forces to simulate the vibrations of a base excitation. The principles of the modal force combination method are explained and basis equations are derived. With the purpose of investigating the feasibility of the method, an analytical case study based on experimental modal data is performed on the PPF satellite. The derivation of the PPF simulation model from a comprehensive modal survey test is described.The structural responses to an exemplary base acceleration input are calculated and compared to the calculated responses of a modal force combination excitation. The results demonstrate the feasibility of the method. Due to the required input data, the modal force combina- tion method can be excellently combined with a modal survey test. Thus, the combined performance of a modal survey test and modal forcesimulation test delivers both the basis for the validation of the of the analytical model and the dynamic qualification of the structural design.
| Item URL in elib: | https://elib.dlr.de/39812/ | |||||||||
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| Document Type: | Conference or Workshop Item (Paper) | |||||||||
| Additional Information: | LIDO-Berichtsjahr=1997, | |||||||||
| Title: | On the feasibility of Replacing Base Excitation by Modal Forces in Qualification Testing - A Case Study on the PPF Satellite. | |||||||||
| Authors: |
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| Date: | 1997 | |||||||||
| Journal or Publication Title: | Proceedings of the 3rd International Symposium on Environmental Testing for Space Programmes, ESA SP-408, 1997. | |||||||||
| Open Access: | No | |||||||||
| Gold Open Access: | No | |||||||||
| In SCOPUS: | No | |||||||||
| In ISI Web of Science: | No | |||||||||
| Page Range: | pp. 91-97 | |||||||||
| Series Name: | ESA SP-408 | |||||||||
| Status: | Published | |||||||||
| Keywords: | base excitation, modal forces, qualification testing, PPF satellite | |||||||||
| Event Title: | 3rd International Symposium on Environmental Testing for Space Programmes, 1997 | |||||||||
| HGF - Research field: | UNSPECIFIED | |||||||||
| HGF - Program: | Space (old) | |||||||||
| HGF - Program Themes: | W RP - Raumtransport | |||||||||
| DLR - Research area: | UNSPECIFIED | |||||||||
| DLR - Program: | W RP - Raumtransport | |||||||||
| DLR - Research theme (Project): | UNSPECIFIED | |||||||||
| Location: | Göttingen | |||||||||
| Institutes and Institutions: | Institute of Aeroelasticity | |||||||||
| Deposited By: | DLR-Beauftragter, elib | |||||||||
| Deposited On: | 02 Apr 2006 | |||||||||
| Last Modified: | 27 Apr 2009 10:55 |
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