scholarly journals A numerical study of rotor eccentricity and dynamic load in induction machines for motor current analysis based diagnostics

2021 ◽  
Author(s):  
Fengshou Gu ◽  
Haiyang Li ◽  
Zhexiang Zou ◽  
Xiuquan Sun ◽  
Andrew D. Ball
Keyword(s):  
Dynamic Load ◽  
Numerical Study ◽  
Induction Machines ◽  
Current Analysis ◽  
Motor Current ◽  
Rotor Eccentricity

scholarly journals Numerical Study on the Elastic Deformation and the Stress Field of Brittle Rocks under Harmonic Dynamic Load

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 851
Author(s):  
Siqi Li ◽  
Shenglei Tian ◽  
Wei Li ◽  
Xin Ling ◽  
Marcin Kapitaniak ◽  
...  
Keyword(s):  
Stress Field ◽  
Numerical Simulations ◽  
Elastic Deformation ◽  
Fatigue Damage ◽  
Dynamic Load ◽  
Static Load ◽  
Numerical Study ◽  
Rock Fracture ◽  
Dynamic Loads ◽  
Brittle Rocks

In order to study the deformation displacement and the stress field of brittle rocks under harmonic dynamic loading, a series of systematic numerical simulations are conducted in this paper. A 3D uniaxial compression simulation is carried out to calibrate and determine the property parameters of sandstone and a model of the cylindrical indenter intruding the rock is proposed to analyze the process of elastic deformation. Four main parameters are taken into account, namely the position on the rock, the frequency and the amplitude of dynamic load, the type of indenter and the loading conditions (static and static-dynamic). Based on the analysis undertaken, it can be concluded that both of the deformation displacement and stress field of the rock change in a harmonic manner under the static-dynamic loads. The frequency and the amplitude of harmonic dynamic load determine the period and the magnitude of the rock response, respectively. In addition, the existence of harmonic dynamic load can aggravate the fatigue damage of the rock and allow a reduction in static load. Our investigations confirm that the static-dynamic loads are more conducive to rock fracture than static load.

scholarly journals Numerical modelling of thin anisotropic membrane under dynamic load

2020 ◽  
Vol 125 (1283) ◽  
pp. 109-126
Author(s):  
V.V. Aksenov ◽  
A.V. Vasyukov ◽  
I.B. Petrov
Keyword(s):  
Dynamic Load ◽  
Numerical Study ◽  
3D Models ◽  
Computational Time ◽  
Destructive Testing ◽  
Static Approximation ◽  
Testing Procedures ◽  
3D Space ◽  
Composite Layers ◽  
The Impact

ABSTRACTThis work aims to describe a mathematical model and a numerical method to simulate a thin anisotropic membrane moving and deforming in 3D space under a dynamic load of an arbitrary time and space profile. The anisotropic continuum medium model described in the article can be used to model a membrane made of composite material using its effective elastic parameters. The model and the method allow the consideration of problems when the quasi-static approximation is not valid and elastic waves caused by the impact should be calculated. The model and the method can be used for numerical study of different processes in thin composite layers, such as shock load, ultrasound propagation, non-destructive testing procedures and vibrations. The thin membrane is considered as a 2D object in 3D space, an approach that allows a reduction in the computational time compared with full 3D models, while still having an arbitrary material rheology and load profile.

scholarly journals A continuous energy-efficiency optimization controller for field-orientation induction motor drives

2020 ◽  
Vol 5 (130) ◽  
pp. 3-14
Author(s):  
Grygorii Diachenko ◽  
Oleksandr Aziukovskyi
Keyword(s):  
Time Constant ◽  
Numerical Study ◽  
Transient Behavior ◽  
Induction Machines ◽  
Motor Drives ◽  
Rate Of Change ◽  
Field Orientation ◽  
Linkage Rate ◽  
Adaptive Choice ◽  
Operation Cycle

The current paper discusses the adaptive choice of a filter time constant for filtering the steady-state flux reference in the energy-efficient control problem of field-orientation induction machines in transient behavior when load and speed conditions are changing taking into account the effect of the main induction saturation. It is shown that by appropriately managing the flux linkage rate of change the energy losses per full operation cycle under torque changes can be significantly reduced compared to the conventional cases. The analysis for the appropriate choice of the filter time constant as a fraction of the rotor time constant is based on a numerical study and simulation results for three different induction machines with different rated powers.

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