Impact of building sway on in-car vibration of ultrahigh-rise elevators — multiphysics simulation approach
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Insinööritieteiden korkeakoulu |
Master's thesis
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Authors
Date
2018-12-10
Department
Major/Subject
Mcode
ENG25
Degree programme
Master's Programme in Mechanical Engineering (MEC)
Language
en
Pages
77+6
Series
Abstract
High-rise, high-speed elevators are subjected to both static and dynamic loads. They are transferred into the elevator and perceived as in-car vibrations. Building sway is one of the main contributors to in-car vibration for high-rise elevators. Vibrations transferred into the elevator is greatly influenced by the response of building sway amplitudes. A finite element model of the elevator was developed using ABAQUS/Standard. Transient dynamic simulation method was utilized to compute the in-car vibrations. Various subroutines were used to include the installation inaccuracies over the travel distance. Aerodynamic loads calculated using computational fluid dynamics were used in the finite element model as pressure loads acting over a specified time interval. Finite difference method was used to study the rope behavior for different building sway amplitudes and elevator speed profiles. The rope forces calculated using this method is extracted and applied in the finite element simulation. The output of each computations is expressed as in-car vibration amplitudes. This thesis mainly focuses on the prediction of in-car vibration due to building sway for a specific elevator configuration. Human perception of the vibration and the discomfort caused to the passengers because of the in-car vibration is investigated. Finally, the thesis proposes an optimized speed profile approach to mitigate this problem. 51 combinations of various building sway amplitude and speed profiles are computed using finite element method. Multiple regression model function is developed by curve fitting and validated against the test data. The generated function helps to predict the optimized speed profile that needs to be followed in order to maintain the required ride comfort. Also, the benefits of optimized speed profile is demonstrated by using handling capacity assessment calculations.Description
Supervisor
Niiranen, JarkkoThesis advisor
Roivainen, GabrielaKeywords
finite element method, ride comfort, high rise elevator, regression analysis, handling capacity, multiphysics