Northampton Electronic Collection of Theses and Research

The modelling, simulation and experimental testing of the dynamic responses of an elevator system

Arrasate, X., Kaczmarczyk, S., Almandoz, G., Abete, J. M. and Isasa, I. (2014) The modelling, simulation and experimental testing of the dynamic responses of an elevator system. Mechanical Systems and Signal Processing. 42(1-2), pp. 258-282. 0888-3270.

Item Type: Article
Abstract: Vertical vibrations affect passenger comfort during an elevator travel. This work presents the results of a study of vertical vibrations caused by torque ripple generated at the elevator drive system. Tests are performed on a 1:1 roping configuration laboratory model; the acceleration response at the suspended masses and at the drive machine, the machine shaft velocity and the three phase current intensities supplied to the machine are measured during several travels. The machine torque is estimated from the current intensities. Anon stationary model of an elevator is then developed to simulate the acceleration response. The model accommodates the drive system dynamics. The machine parameters are computed by means of the Finite Element Method simulation software FLUX. FLUX computes the amplitudes of the torque ripple and the radial forces at the air-gap. As the torque ripple computed by FLUX is smaller than that torque estimated from the machine currents, the latter is added as a perturbation to the controller generated torque. With respect to the car– counterweight–sheave–ropes assembly a five degree-of-freedom lumped-parameter model (LPM) and a novel distributed-parameter one (DPM) are developed. The elevator dynamics represented by the DPM is described by a partial differential equation set that is discretised by expanding the vertical displacements in terms of the linear stationary mode shapes of a system composed of three masses constrained by the suspension rope. The models are implemented in the MATLAB/Simulink computational environment and the system response is determined through numerical simulation. It is shown that the LPM forms a good approximation of the DPM. The frequency content of the computed and measured accelerations demonstrates that the elevator car vibrates at frequencies generated at the machine, especially when they are close to the system natural frequencies.
Uncontrolled Keywords: Elevator, vertical vibration, drive system, model, computer simulation, Experimental test
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ1370 Elevators
T Technology > TJ Mechanical engineering and machinery > TJ170 Mechanics applied to machinery. Dynamics
Creators: Arrasate, Xabier, Kaczmarczyk, Stefan, Almandoz, Gaizka, Abete, Jose M and Isasa, Inge
Publisher: Elsevier
Faculties, Divisions and Institutes: University Faculties, Divisions and Research Centres - OLD > Research Group > Advanced Technologies Research Group
University Faculties, Divisions and Research Centres - OLD > School of Science and Technology (2010-2016)
Faculties > Faculty of Arts, Science & Technology > Computing
Date: January 2014
Date Type: Publication
Page Range: pp. 258-282
Journal or Publication Title: Mechanical Systems and Signal Processing
Volume: 42
Number: 1-2
Language: English
ISSN: 0888-3270
Status: Published / Disseminated
Refereed: Yes
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