Modal analysis of magnetic vibration of induction motor used in household appliances

2020 ◽  
pp. 1-16
Author(s):  
Pawel Witczak ◽  
Witold Kubiak ◽  
Jacek Szulakowski
Keyword(s):  
Finite Elements ◽  
Modal Analysis ◽  
Induction Motor ◽  
Numerical Approach ◽  
Combined Approach ◽  
Theoretical Investigations ◽  
Rigorous Description ◽  
Modal Description ◽  
Mechanical Phenomena ◽  
Rotor Axis

The paper deals with analysis of vibrational behavior of induction motor using the combined approach linking the finite elements method (FEM) applied to modelling of magnetic and mechanical phenomena in the motor with its modal description in spectral domain. Results of investigations presented in this paper proved that relatively small rotor axis misalignment against stator leads to visible vibration if forces resulted from this effect have frequency close to rotor bending resonance. Paper contains a rigorous description of all steps in analysis with a special attention paid to details of numerical approach both in FEM and in spectral consideration. Results of theoretical investigations were confirmed by measurements.

Dynamic Model for Harmonic Induction Motor Analysis Determined by Finite Elements

2004 ◽  
Vol 19 (1) ◽  
pp. 102-108 ◽  
Author(s):  
Z. Papazacharopoulos ◽  
K. Tatis ◽  
A. Kladas ◽  
S. Manias
Keyword(s):  
Finite Elements ◽  
Induction Motor ◽  
Dynamic Model

Thermal jet drilling of granite rock: a numerical 3D finite-element study

2021 ◽  
Vol 379 (2196) ◽  
pp. 20200128
Author(s):  
Timo Saksala ◽  
Reijo Kouhia ◽  
Ahmad Mardoukhi ◽  
Mikko Hokka
Keyword(s):  
Finite Elements ◽  
Numerical Study ◽  
Thermal Flux ◽  
Three Dimensional ◽  
Numerical Approach ◽  
Mass Scaling ◽  
Granite Rock ◽  
Fracture Dynamics ◽  
Rock Heterogeneity ◽  
Thermal Drilling

This paper presents a numerical study on thermal jet drilling of granite rock that is based on a thermal spallation phenomenon. For this end, a numerical method based on finite elements and a damage–viscoplasticity model are developed for solving the underlying coupled thermo-mechanical problem. An explicit time-stepping scheme is applied in solving the global problem, which in the present case is amenable to extreme mass scaling. Rock heterogeneity is accounted for as random clusters of finite elements representing rock constituent minerals. The numerical approach is validated based on experiments on thermal shock weakening effect of granite in a dynamic Brazilian disc test. The validated model is applied in three-dimensional simulations of thermal jet drilling with a short duration (0.2 s) and high intensity (approx. 3 MW m −2 ) thermal flux. The present numerical approach predicts the spalling as highly (tensile) damaged rock. Finally, it was shown that thermal drilling exploiting heating-forced cooling cycles is a viable method when drilling in hot rock mass. This article is part of the theme issue ‘Fracture dynamics of solid materials: from particles to the globe’.

Sign in / Sign up

Export Citation Format

Share Document