Numerical Modal Analysis of Vibrations in a Three-Phase Linear Switched Reluctance Actuator. (18th April 2017)

• Record Type: Journal Article
• Authors: Salvado, José; Calado, Maria do Rosário; Santo, António Espírito; Guerman, Anna
• Other Names: Chiu Min-Chie Academic Editor.
• Is Part Of: Modelling and simulation in engineering. Volume 2017(2017)
• Publication Date: 2017-04-18
• Subjects: Engineering -- Simulation methods -- Periodicals; Engineering -- Mathematical models -- Periodicals; 620.004
• DOI: 10.1155/2017/3258376
• Languages: English
• ISSNs: 1687-5591

Abstract

Abstract : This paper addresses the problem of vibrations produced by switched reluctance actuators, focusing on the linear configuration of this type of machines, aiming at its characterization regarding the structural vibrations. The complexity of the mechanical system and the number of parts used put serious restrictions on the effectiveness of analytical approaches. We build the 3D model of the actuator and use finite element method (FEM) to find its natural frequencies. The focus is on frequencies within the range up to nearly 1.2 kHz which is considered relevant, based on preliminary simulations and experiments. Spectral analysis results of audio signals from experimental modal excitation are also shown and discussed. The obtained data support the characterization of the linear actuator regarding the excited modes, its vibration frequencies, and mode shapes, with high potential of excitation due to the regular operation regimes of the machine. The results reveal abundant modes and harmonics and the symmetry characteristics of the actuator, showing that the vibration modes can be excited for different configurations of the actuator. The identification of the most critical modes is of great significance for the actuator's control strategies. This analysis also provides significant information to adopt solutions to reduce the vibrations at the design.