Abstract
Traditionally, the method of low stiffness suspension is a standard method for the modal test of structures. A requirement on the suspension stiffness is that the suspension frequency should be much lower than the first flexible natural frequency of the tested structure. Nevertheless, for large scale structure with very low first natural frequency, which could be as low as 0.1Hz, it will need very long suspension spring to achieve the required frequency. This may be not acceptable for many labs. Even if there is sufficient high room space for the suspension, the test is, strictly speaking, two dimensional, i.e. in the plane defined by the suspension. In this paper, we discuss existing methods for coping with these problems by replacing the low stiffness suspension with a group of supports that can have any stiffness. By removing the influence of the support stiffness from a later computation with measured frequency responses, the three dimension modal test can be done conveniently. Numerical examples are described in the paper.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Wada BK, Michael L (2002) Pre-flight validation of gossamer structures. In: 43rd AIAA/ASME/ASCE/AHS/ASC structures, structural dynamics, and materials conference, Colorado
Allen MS, Mayes RL, Bergman EJ (2010) Experimental modal substructuring to couple and uncouple substructures with flexible fixtures and multi-point connections. J Sound Vib 329:4891–4906
Mays RL, Stasiunas EC (2007) Combining lightly damped experimental substructures with analytical substructures. In: Proceedings of the 25th international modal analysis conference, Orlando
Mays RL, Hunter PS, Simmermacher TW (2008) Combining experimental and analytical substructures with multiple connections. In: Proceeding of the 26th international modal analysis conference, Orlando
D’Ambrogio W, Fregolent A (2009) Decoupling procedures in the general framework of frequency based substructuring. In: Proceeding of the 27th international modal analysis conference, Bethel
D’Ambrogio W, Fregolent A (2010) The role of interface DoFs in decoupling of substructures based on the dual domain decomposition. Mech Syst Signal Process 24:2035–2048
Sjövall P, Abrahamsson T (2008) Substructure system identification from coupled system test data. Mech Syst Signal Process 22:15–33
Jetmundsen B, Bielawa RL, Flanelly WG (1988) Generalized frequency domain substructure synthesis. J Am Helicopter Soc 33:55–64
de Klerk D, Rixen DJ, Voormeeren SN (2008) General framework for dynamic substructuring: history, review, and classification of techniques. AIAA J 46(5):1169–1181
Su T-J, Juang J-N (1994) Substructures system identification and synthesis. J Guid Contr Dynam 17(5):1087–1095
Acknowledgement
This work is sponsored by the Nature Science Foundation of China (No. 11072121).
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2012 The Society for Experimental Mechanics, Inc. 2012
About this paper
Cite this paper
Wang, D., Liu, L., Zheng, G. (2012). Boundary Constrained Modal Test Method for Large Scale Highly Flexible Structures. In: Allemang, R., De Clerck, J., Niezrecki, C., Blough, J. (eds) Topics in Modal Analysis I, Volume 5. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-2425-3_48
Download citation
DOI: https://doi.org/10.1007/978-1-4614-2425-3_48
Published:
Publisher Name: Springer, New York, NY
Print ISBN: 978-1-4614-2424-6
Online ISBN: 978-1-4614-2425-3
eBook Packages: EngineeringEngineering (R0)