Loss Factors of Structural Cables for Modal Damping Evaluation

Hamazaki, Yoshihiro; Okada, Toru; Yamaguchi, Hiroki; Fujino, Yozo

doi:10.2208/jsceja.62.279

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2009

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“…However, few papers have reported a comparison with experimental results at the scale of actual elevator ropes. Some papers (10)(11)(12) have reported the damping ratio of a rope whose diameter-to-length ratio is greater than 10 -3 (short rope), where the damping ratio is measured from the free vibration wave. However, few papers have reported the damping ratio in the case of an elevator rope with small diameter-to-length ratio (5 × 10 -5 to 10 -3 ).…”

Section: Introductionmentioning

confidence: 99%

Vibration Analysis of Elevator Rope (Comparison between Experimental Results and Calculated Results)

Kimura

Iijima

Matsuo

et al. 2009

JSDD

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An elevator rope in a high-rise building is forcibly excited by the displacement of the building caused by earthquakes and wind forces. This paper presents experiments involving free vibration and forced vibration of a rope for obtaining its natural frequency and damping coefficient. Experiments involving forced vibration of a rope whose length varies with time due to the up-and-down movement of a cage are also presented. Finite difference analyses of the rope vibration were performed by considering the time-varying length of the rope, based on the assumption that the movement velocity is constant. The calculated results of the finite difference analyses are in fairly good agreement with the experimental results.

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Section: Introductionmentioning

confidence: 99%