On the modeling and analysis of a vibration absorber for overhead powerlines with multiple resonant frequencies

Vaja, Nitish Kumar; Barry, Oumar; Tanbour, Emad Y.

doi:10.1016/j.engstruct.2018.08.051

Cited by 14 publications

(8 citation statements)

References 11 publications

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“…However, the vibration modes were not determined through theoretical method. Wagner et al (1973) established a theoretical analysis of the response characteristics of Stockbridge dampers including undamped natural frequencies and forced vibration, and then the theoretical predictions were verified experimentally. Using this linear model (Claren and Diana, 1969), Zhan et al (2011) discussed the effects of the structural parameters on the power characteristics of a Stockbridge damper; Kim (2017) developed an approximate calculation method of the natural frequencies, and the sensitivity to the structural parameters was also analysed through both formula and case studies.…”

Section: Dynamic Characteristics Of a Stockbridge Type Vibration Dampermentioning

confidence: 99%

“…However, considering the damping, characteristics of the messenger cable, one-side damper with more than two natural frequencies, and so on, this linear model cannot be used. Regardless of damping, Vaja et al (2018) present an analytical model of a novel aeolian vibration damper with an increased number of natural frequencies using Hamilton's principle, and the natural frequencies of this damper were deduced. Li et al (2018) established a theoretical calculation model without damping for FDZ-type dampers that have three natural frequencies in one-side through space geometry and dynamics.…”

Section: Dynamic Characteristics Of a Stockbridge Type Vibration Dampermentioning

confidence: 99%

“…The vibration of the vibration damper is the most intense at its natural frequencies, and thus the vibration damper consumes more energy, affording better anti-vibration effect. Therefore, the natural frequencies of the vibration damper should be in the protected frequency range, especially in the dangerous frequency range (Vaja et al, 2018). As a result, the structure design and the calculation of the natural frequencies of the vibration damper are of high importance.…”

Section: Introductionmentioning

confidence: 99%

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The approximate calculation of the natural frequencies of a Stockbridge type vibration damper and analysis of natural frequencies' sensitivity to the structural parameters

et al. 2021

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Abstract. Vibration damper is widely used in overhead transmission lines to alleviate aeolian vibration. Its natural frequencies are important parameters for a vibration damper. In this paper, the approximate calculation formulas of natural frequencies of the one-side subsystem of a Stockbridge type vibration damper were derived and the design sensitivity analysis of the natural frequencies was studied using partial differential equations with respect to each concerned parameter including the length of the steel strand, the mass of the counterweight, the eccentric distance, and the radius of gyration of the counterweight. Through a case study that considered a variation of up to ±30 % in the values of the design parameters, the exact calculation and approximate calculation results of the natural frequencies were analysed, and the sensitivity of the vibration damper's natural frequencies to the design parameters was studied. The results show that, within the range of the parameters used in this study, the approximately calculated first-order frequency is lower than the exact values, whereas the approximately calculated second-order frequency is larger than the exact values. The sensitivity analysis indicates that the first-order frequency is highly sensitive to the steel strand's length, whereas it is moderately sensitive to the counterweight's mass and slightly sensitive to the eccentric distance and the gyration radius of the counterweight; the second-order frequency is highly sensitive to the steel strand's length and the gyration radius of the counterweight, moderately sensitive to the counterweight's mass, and slightly sensitive to the eccentric distance. It will provide theoretical guidance and approximate analysis method in engineering for the design of the vibration damper.

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Section: Dynamic Characteristics Of a Stockbridge Type Vibration Dampermentioning

confidence: 99%

Section: Dynamic Characteristics Of a Stockbridge Type Vibration Dampermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The approximate calculation of the natural frequencies of a Stockbridge type vibration damper and analysis of natural frequencies' sensitivity to the structural parameters

et al. 2021

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“…Dampers, such as tuned mass damper, magnetorheological damper and Stockbridge damper, were adopted to provide additional energy dissipation for reducing wind-induced structural vibration, also applicable for VIV of transmission line [13]. Vaja presented an analytical model of a novel VIV damper with an increased number of resonant frequencies [14]. Generally, the maximum steady-state amplitude of the conductor during the VIV process was solved by energy balance mothed [15,16].…”

Section: Introductionmentioning

confidence: 99%

Wind-Induced Response and Its Controlling of Long-Span Cross-Rope Suspension Transmission Line

2022

Applied Sciences

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In mountainous areas, the installation of steel towers was the major obstacle to the construction of transmission lines. In long-span cross-rope suspension (CRS) structures, the conductors are supported by hundreds-meters-long suspension cables crossing valleys instead of steel towers. Though long-span CRS is an innovative structural system, its structural performance needs to be clarified. Firstly, an assembled FE model was established based on initial deformed components for long-span cross-rope suspension structure. The wind load response of long-span cross-rope suspension structure with different lengths or number of spans was established and analyzed. Vortex-induced vibration (VIV), which was the major factor regarding fatigue and service life, and its controlling by Stockbridge damper for a long-span CRS were discussed. The numerical simulation results showed that the tensile force of the suspension cable increased with the length and number of spans of the conductor. In addition, considering the ice covering the transmission line, the interaction between the wind load and ice load induced the nonlinear lateral deformation characteristics of the conductor. Moreover, the vibration characteristics of the conductor in the long-span CRS were studied and compared with the traditional tower-line system. An analysis of the long-span CRS with a Stockbridge damper showed that additional dampers were essential for controlling the maximum dynamic bending stress of conductors at both ends.

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“…The results obtained revealed that the moment of inertia of the power line was directly proportional to the inertia of the messenger cable. Vaja et al [8] developed an analytical model of a fresh vibration damper with an increased number of resonant frequencies. A 3D finite element model was developed to validate the analytical model.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of the asymmetric Stockbridge damper

2021

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The Stockbridge damper (tuned mass absorber) is used on overhead transmission power lines to suppress wind-induced vibrations. These power lines get exposed to various types of wind motions that cause them to vibrate and this causes fatigue failure at the suspension clamp where the maximum stress occurs. Aeolian vibration is the most common wind motion that causes fatigue and eventually, failure to transmission lines. This paper presents the study of an asymmetric Stockbridge damper. A set of experiments were conducted on the damper according to the Institute of Electrical and Electronics Engineers (IEEE) 664 standards to evaluate the characteristics of the asymmetric Stockbridge damper. The results obtained revealed that the asymmetric damper is four degrees of freedom. The results also revealed a relationship between the mass and the magnitude of the resonance frequency.

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On the modeling and analysis of a vibration absorber for overhead powerlines with multiple resonant frequencies

Cited by 14 publications

References 11 publications

The approximate calculation of the natural frequencies of a Stockbridge type vibration damper and analysis of natural frequencies' sensitivity to the structural parameters

The approximate calculation of the natural frequencies of a Stockbridge type vibration damper and analysis of natural frequencies' sensitivity to the structural parameters

Wind-Induced Response and Its Controlling of Long-Span Cross-Rope Suspension Transmission Line

Characteristics of the asymmetric Stockbridge damper

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