scholarly journals The Use of Digital Twins in Finite Element for the Study of Induction Motors Faults

Sensors ◽  
2021 ◽  
Vol 21 (23) ◽  
pp. 7833
Author(s):  
Tiago Drummond Lopes ◽  
Adroaldo Raizer ◽  
Wilson Valente Júnior
Keyword(s):  
Finite Element ◽  
Induction Motors ◽  
Correct Diagnosis ◽  
Element Model ◽  
Industrial Sector ◽  
Technical Literature ◽  
Digital Twins ◽  
Motor Current Signature Analysis ◽  
Diagnosis And Classification

Induction motors play a key role in the industrial sector. Thus, the correct diagnosis and classification of faults on these machines are important, even in the initial stages of evolution. Such analysis allows for increased productivity, avoids unexpected process interruptions, and prevents damage to machines. Usually, fault diagnosis is carried out by analyzing the characteristic effects caused by the faults. Thus, it is necessary to know and understand the behavior during the operation of the faulty machine. In general, monitoring these characteristics is complex, as it is necessary to acquire signals from the same motor with and without failures for comparison purposes. Whether in an industrial environment or in laboratories, the experimental characterization of failures can become unfeasible for several reasons. Thus, computer simulation of faulty motors digital twins can be an important alternative for failure analysis, especially in large motors. From this perspective, this paper presents and discusses several limitations found in the technical literature that can be minimized with the implementation of digital twins. In addition, a 3D finite element model of an induction motor with broken rotor bars is demonstrated, and motor current signature analysis is used to verify the fault effects. Results are analyzed in the time and frequency domain. Additionally, an artificial neural network of the multilayer perceptron type is used to classify the failure of broken bars in the 3D model rotor.

scholarly journals Numerical investigation of the effects of unsupported railway sleepers on train-induced environmental vibrations

2017 ◽  
Vol 36 (2) ◽  
pp. 160-176 ◽  
Author(s):  
Seyed-Ali Mosayebi ◽  
Morteza Esmaeili ◽  
Jabbar-Ali Zakeri
Keyword(s):  
Finite Element ◽  
Element Model ◽  
Two Dimensions ◽  
Railway Track ◽  
Sensitivity Analyses ◽  
Regression Equations ◽  
The Finite Element Method ◽  
Technical Literature ◽  
Support Force ◽  
Comparison Of The Results

Review of technical literature regarding to train-induced vibrations shows that the effects of unsupported railway sleepers on this issue have been less investigated. So, the present study was devoted to numerical investigations of the mentioned issue. In this regard, first the problem of longitudinal train–track dynamic interaction was simulated in two dimensions by using the finite element method and the developed model was validated through comparison of the results with those obtained by previous researchers. In the next stage, a series of sensitivity analyses were accomplished to account for the effects of value of gap beneath the unsupported sleeper(s) and the track support stiffness on increasing the sleeper displacement and track support force. Moreover, the raised sleeper support force was introduced as applied load to a two-dimensional plane strain finite element model of track in lateral section and consequently the train-induced vibrations were assessed. As a result, a series of regression equations were established between the peak particle velocity in the surrounding environment of railway track and the sleeper support stiffness for tracks without unsupported sleepers and with one and two unsupported sleepers.

Design and characterization of a hybrid soft gripper with active palm pose control

2020 ◽  
Vol 39 (14) ◽  
pp. 1668-1685 ◽  
Author(s):  
Vignesh Subramaniam ◽  
Snehal Jain ◽  
Jai Agarwal ◽  
Pablo Valdivia y Alvarado
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Composite Structure ◽  
Element Model ◽  
Open Loop ◽  
Aspect Ratios ◽  
Maximum Payload ◽  
Wide Range ◽  
Pose Control

The design and characterization of a soft gripper with an active palm to control grasp postures is presented herein. The gripper structure is a hybrid of soft and stiff components to facilitate integration with traditional arm manipulators. Three fingers and a palm constitute the gripper, all of which are vacuum actuated. Internal wedges are used to tailor the deformation of a soft outer reinforced skin as vacuum collapses the composite structure. A computational finite-element model is proposed to predict finger kinematics. Thanks to its active palm, the gripper is capable of grasping a wide range of part geometries and compliances while achieving a maximum payload of 30 N. The gripper natural softness enables robust open-loop grasping even when components are not properly aligned. Furthermore, the grasp pose of objects with various aspect ratios and compliances can be robustly maintained during manipulation at linear accelerations of up to 15 m/s2 and angular accelerations of up to 5.23 rad/s2.

Finite element model for the characterization of deleterious phases by eddy current technique

2012 ◽  
Vol 39 (1-4) ◽  
pp. 305-310 ◽  
Author(s):  
Maria C.L. Areiza ◽  
Rodrigo Sacramento ◽  
Joao M.A Rebello ◽  
Rubem L. Sommer ◽  
Diego Gonzalez
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Eddy Current ◽  
Element Model ◽  
Current Technique

scholarly journals Seismic Strengthening of the Bagh Durbar Heritage Building in Kathmandu Following the Gorkha Earthquake Sequence

Buildings ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 128 ◽  
Author(s):  
Rabindra Adhikari ◽  
Pratyush Jha ◽  
Dipendra Gautam ◽  
Giovanni Fabbrocino
Keyword(s):  
Finite Element ◽  
Element Model ◽  
Gorkha Earthquake ◽  
Seismic Safety ◽  
Early 19Th Century ◽  
Heritage Sites ◽  
Greco Roman ◽  
Heritage Building ◽  
Definition Of

The so-called Greco-Roman monuments, also known as neoclassical monuments, in Nepal represent unique construction systems. Although they are not native to Nepal, they are icons of the early 19th century in the Kathmandu valley. As such structures are located within the heritage sites and historical centers, preservation of Greco-Roman monuments is necessary. Since many buildings are in operation and accommodate public and critical functions, their seismic safety has gained attention in recent times, especially after the Gorkha earthquake. This paper first presents the background of the Bagh Durbar monument, reports the damage observations, and depicts some repair and retrofitting solutions. Attention is paid to the implementation of the different phases of the structural characterization of the building, the definition of reference material parameters, and finally, the structural analysis made by using finite element models. The aim of the contribution consists of comparison of the adequacy of the finite element model with the field observations and design of retrofitting solutions to assure adequate seismic safety for typical Greco-Roman buildings in Nepal. Thus, this paper sets out to provide rational strengthening solutions compatible with the existing guidelines rather than complex numerical analyses.

Characterization of Delamination in Laser Microtransfer Printing

2014 ◽  
Vol 2 (1) ◽  
Author(s):  
Ala'a M. Al-okaily ◽  
John A. Rogers ◽  
Placid M. Ferreira
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Laser Heating ◽  
Thermal Gradient ◽  
Heterogeneous Materials ◽  
Element Model ◽  
Extensive Study ◽  
Materials Integration ◽  
Gradient Fields

Microtransfer printing is rapidly emerging as an effective method for heterogeneous materials integration. Laser microtransfer printing (LMTP) is a noncontact variant of the process that uses laser heating to drive the release of the microstructure from the stamp. This makes the process independent of the properties or preparation of the receiving substrate. In this paper, an extensive study is conducted to investigate the capability of the LMTP process. Furthermore, a thermomechanical finite element model (FEM) is developed, using the experimentally observed delamination times and absorbed powers, to estimate the delamination temperatures at the interface, as well as the strain, displacement, and thermal gradient fields.

Characterization of articular cartilage by combining microscopic analysis with a fibril-reinforced finite-element model

2007 ◽  
Vol 40 (8) ◽  
pp. 1862-1870 ◽  
Author(s):  
Petro Julkunen ◽  
Panu Kiviranta ◽  
Wouter Wilson ◽  
Jukka S. Jurvelin ◽  
Rami K. Korhonen
Keyword(s):  
Finite Element ◽  
Articular Cartilage ◽  
Finite Element Model ◽  
Microscopic Analysis ◽  
Element Model
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