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Advances in Aircraft and Spacecraft Science Volume 2, Number 2, April 2015 , pages 217-232 DOI: https://doi.org/10.12989/aas.2015.2.2.217 |
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Force limited vibration testing: an evaluation of the computation of C2 for real load and probabilistic source |
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J.J. Wijker, A. de Boer and M.H.M. Ellenbroek
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| Abstract | ||
| To prevent over-testing of the test-item during random vibration testing Scharton proposed and discussed the force limited random vibration testing (FLVT) in a number of publications. Besides the random vibration specification, the total mass and the turn-over frequency of the load (test item), C2 is a very important parameter for FLVT. A number of computational methods to estimate C2 are described in the literature, i.e., the simple and the complex two degrees of freedom system, STDFS and CTDFS, respectively. The motivation of this work is to evaluate the method for the computation of a realistic value of C2 to perform a representative random vibration test based on force limitation, when the adjacent structure (source) description is more or less unknown. Marchand discussed the formal description of getting C2, using the maximum PSD of the acceleration and maximum PSD of the force, both at the interface between load and source. Stevens presented the coupled systems modal approach (CSMA), where simplified asparagus patch models (parallel-oscillator representation) of load and source are connected, consisting of modal effective masses and the spring stiffness | ||
| Key Words | ||
| force limited vibration testing | ||
| Address | ||
| J.J. Wijker and A. de Boer: Faculty Engineering Technology, Department Applied Mechanics, University Twente, Drienerlolaan 5, 7522 NB Enschede, The Netherlands M.H.M. Ellenbroek: Faculty Engineering Technology, Department Applied Mechanics, University Twente, Drienerlolaan 5, 7522 NB Enschede, The Netherlands; Dutch Space BV, Mendelweg 30, 2333 CS Leiden, The Netherlands | ||
