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자료유형
학술저널
저자정보
저널정보
국제구조공학회 Smart Structures and Systems, An International Journal Smart Structures and Systems, An International Journal Vol.15 No.3
발행연도
2015.1
수록면
627 - 643 (17page)

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Negative stiffness, previously emulated by active or semi-active control for cable vibrationmitigation, is realized passively using a self-contained highly compressed spring, the negative stiffnessdevice (NSD).The NSD installed in parallel with a viscous damper (VD) in the vicinity of cable anchorage,enables increment of damper deformation during cable vibrations and hence increases the attainable cabledamping. Considering the small cable displacement at the damper location, even with the weakening device,the force provided by the NSD-VD assembly is approximately linear. Complex frequency analysis has thusbeen conducted to evaluate the damping effect of the assembly on the cable; the displacement-dependentnegative stiffness is further accounted by numerical analysis, validating the accuracy of the linearapproximation for practical ranges of cable and NSD configurations. The NSD is confirmed to be a practicaland cost-effective solution to improve the modal damping of a cable provided by an external damper,especially for super-long cables where the damper location is particularly limited. Moreover, mathematically,a linear negative stiffness and viscous damping assembly has proven capability to represent active orsemi-active control for simplified cable vibration analysis as reported in the literature, while in these studiesonly the assembly located near cable anchorage has been addressed. It is of considerable interest tounderstand the general characteristics of a cable with the assembly relieving the location restriction, since itis quite practical to have an active controller installed at arbitrary location along the cable span such as byhanging an active tuned mass damper. In this paper the cable frequency variations and damping evolutionswith respect to the arbitrary assembly location are then evaluated and compared to those of a taut cable witha viscous damper at arbitrary location, and novel frequency shifts are observed. The characterized complexfrequencies presented in this paper can be used for preliminary damping effect evaluation of an adaptivepassive or semi-active or active device for cable vibration control.

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