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G. Birlik+ and S. Turgay*

+Department of Engineering Sciences, Middle East Technical University, Ankara, Turkey
*Otoyol, Adapazari, Turkey

doi:10.4203/ccp.55.8.4

G. Birlik, S. Turgay, "Determination of Loss Factor using Resonant and Non-Resonant Methods", in B.H.V. Topping, (Editor), "Advances in Computational Structural Mechanics", Civil-Comp Press, Edinburgh, UK, pp 139-146, 1998. doi:10.4203/ccp.55.8.4

Abstract

A comparative assessment of resonant, R, and non-resonant, NR, methods is presented. For this purpose two series, B and W series, of cylindrical specimens were prepared and tested in the laboratory. B and W series were assumed to typify respectively low (eta<0.3) and high damping (eta>0.4) materials. Using a dual channel FFT analyzer the specimens were excited either by random or multisine signals in the frequency range, f <= 200 Hz. Using R and NR methods corresponding loss factors, eta_R and eta_NR were obtained for B and W specimens. eta_R values of the high damping W specimens were approx. 20% high compared to eta_NR values, in the vicinity of their transition frequencies. eta_R and eta_NR values of the low damping B specimens, however, were observed not to differ significantly with respect to each other.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 55 ADVANCES IN COMPUTATIONAL STRUCTURAL MECHANICS Edited by: B.H.V. Topping Paper VIII.4 Determination of Loss Factor using Resonant and Non-Resonant Methods G. Birlik+ and S. Turgay* +Department of Engineering Sciences, Middle East Technical University, Ankara, Turkey *Otoyol, Adapazari, Turkey doi:10.4203/ccp.55.8.4 purchase the full-text of this paper Full Bibliographic Reference for this paper G. Birlik, S. Turgay, "Determination of Loss Factor using Resonant and Non-Resonant Methods", in B.H.V. Topping, (Editor), "Advances in Computational Structural Mechanics", Civil-Comp Press, Edinburgh, UK, pp 139-146, 1998. doi:10.4203/ccp.55.8.4 Abstract A comparative assessment of resonant, R, and non-resonant, NR, methods is presented. For this purpose two series, B and W series, of cylindrical specimens were prepared and tested in the laboratory. B and W series were assumed to typify respectively low (eta<0.3) and high damping (eta>0.4) materials. Using a dual channel FFT analyzer the specimens were excited either by random or multisine signals in the frequency range, f <= 200 Hz. Using R and NR methods corresponding loss factors, eta_R and eta_NR were obtained for B and W specimens. eta_R values of the high damping W specimens were approx. 20% high compared to eta_NR values, in the vicinity of their transition frequencies. eta_R and eta_NR values of the low damping B specimens, however, were observed not to differ significantly with respect to each other. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £95 +P&P)
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