This paper presents two different models for the analysis of elevator hoistway vertical dynamic system. The first is an eight-degrees-of-freedom model, which assumes the ropes of elevator system to be spring & dashpot elements by neglecting the rope mass. The second is an FEA model, which assumes the ropes to be distributed parameter systems and therefore has the rope masses included in the model. The seven natural modes (exclude the first mode at frequency of 0Hz) obtained by the modal analysis for the eight-degrees-of-freedom model are named based on the characteristics of each modes. The effects of the way to model the ropes on those seven modes are clarified by comparing the results from those two different models for rope length being 8m, 16m, 32m, 64m, 128m and 256m. Rope longitudinal wave motion was observed with three modes among those seven modes for long ropes. It is concluded that FEA model should be used for the study of elevator hoistway vertical dynamic system in high buildings.
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