A Simulation on Levitation Force and Guidance Force of the HTSC Bulk Under the Permanent Magnetic Guideway’s Stochastic Excitation

2021 ◽  
Author(s):  
Jungang Yang ◽  
Maoru Chi ◽  
Xingwen Wu ◽  
Yuang Ji ◽  
Shulin Liang
Keyword(s):  
Levitation Force ◽  
Stochastic Excitation ◽  
Guidance Force

Characteristics of vibration in magnetically levitated trains subjected to crosswind

2017 ◽  
Vol 232 (5) ◽  
pp. 1347-1359 ◽  
Author(s):  
Jong-Boo Han ◽  
Ki-Jung Kim
Keyword(s):  
Levitation Force ◽  
Lateral Displacement ◽  
Transition Curve ◽  
Small Radius ◽  
Radius Of Curvature ◽  
Guidance Force ◽  
Lateral Direction ◽  
Urban Transit ◽  
Linear Induction Motor ◽  
Magnetically Levitated

An electromagnetic suspension system-type (EMS-type) magnetically levitated vehicle (Maglev) maintains the airgap between the guiderail and the electromagnet by controlling the electric current through the levitation controller and runs with the help of a linear induction motor. ECOBEE, an EMS-type Maglev, is designed for the purpose of urban transit and must run on a curved guideway with a small radius of curvature. However, while the EMS-type Maglev controls the vertical airgap using the levitation force of the electromagnet, in the case of the lateral direction, a guidance force, which is determined by the levitation force through the intensity of lateral displacement, passively controls the lateral displacement. However, when an excessive lateral displacement is triggered by a disturbance that is greater than the guidance force, an antiaberration skid comes into contact with the rail. Therefore, the Maglev running on a curve with a small radius should maintain the airgap without touching the rail when turning directions on a curved rail, while the vibrations of the vehicle caused by external factors, such as entering the circular curve from the transition curve, or a crosswind, can affect the levitation stability. Therefore, in order to secure the levitation stability of the electromagnet while also improving the curving performance of the vehicle, inserting a lateral damper between the cabin and the bogie has been suggested. In the present study, by using an integrated model of the Maglev system developed by multibody dynamics, the influence of a crosswind as the train runs along a curve and the effect of the lateral damper were analyzed.

Levitation force and guidance force of YBaCuO bulk in applied field

2003 ◽  
Vol 386 ◽  
pp. 536-539 ◽  
Author(s):  
X.R. Wang ◽  
H.H. Song ◽  
Z.Y. Ren ◽  
M. Zhu ◽  
J.S. Wang ◽  
...  
Keyword(s):  
Applied Field ◽  
Levitation Force ◽  
Guidance Force ◽  
Ybacuo Bulk

scholarly journals Optimization of the Guiding Stability of a Horizontal Axis HTS ZFC Radial Levitation Bearing

Actuators ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 311
Author(s):  
António J. Arsénio ◽  
Francisco Ferreira da Silva ◽  
João F. P. Fernandes ◽  
Paulo J. Costa Branco
Keyword(s):  
Levitation Force ◽  
Horizontal Axis ◽  
Zero Field ◽  
Nsga Ii ◽  
Element Analysis ◽  
Guidance Force ◽  
Hts Bulk ◽  
Electromagnetic Model ◽  
Optimization Study ◽  
3D Fea

This document presents a study on the optimization of the 3D geometry of a horizontal axis radial levitation bearing with zero-field cooled (ZFC) high-temperature superconductor (HTS) bulks in the stator, and radially magnetized permanent magnet (PM) rings in the rotor. The optimization of component dimensions and spacing to minimize the volume or cost concerning only the maximization of the levitation force was previously studied. The guidance force and guiding stability depend on the spacing between PM rings in the rotor and between the rings of HTS bulks in the stator. This new optimization study aims to find the optimum spacing that maximize the guidance force with given HTS bulk and PM ring dimensions while maintaining the minimum required levitation force. Decisions are taken using the non-dominated sorting genetic algorithm (NSGA-II) over 3D finite element analysis (FEA). A simplified electromagnetic model of equivalent relative permeability is used on 3D FEA to reduce numerical processing and optimization time. Experimental prototypes were built to measure magnetic forces and validate appropriate values of equivalent magnetic permeability. An analysis of stable and unstable geometry domains depending on the spacing between rings of HTS bulks and PM rings is also done for two HTS bulk sizes.

Wideline 2H -NMR Spectroscopy and Imaging of Solids

1994 ◽  
Vol 49 (1-2) ◽  
pp. 19-26 ◽  
Author(s):  
B. Blümich
Keyword(s):  
Nmr Spectroscopy ◽  
Excitation Power ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
2H Nmr ◽  
Stochastic Excitation ◽  
2H Nmr Spectroscopy ◽  
Spatially Inhomogeneous ◽  
Recent Developments ◽  
Angle Spinning

Abstract Recent developments, focussing on reduction of the rf excitation power by stochastic excitation, on improvements in sensitivity and excitation bandwidth by magic angle spinning, and on combining wideline spectroscopy with spatial resolution for investigations o f spatially inhomogeneous objects are reviewed.

Wave propagation dynamics in a fractional Zener model with stochastic excitation

2020 ◽  
Vol 23 (6) ◽  
pp. 1570-1604
Author(s):  
Teodor Atanacković ◽  
Stevan Pilipović ◽  
Dora Seleši
Keyword(s):  
Wave Propagation ◽  
Constitutive Equation ◽  
Equations Of Motion ◽  
Weak Form ◽  
Stochastic Excitation ◽  
Expansion Theorem ◽  
Zener Model ◽  
Dissipation Inequality ◽  
Regularity Properties ◽  
Fractional Zener Model

Abstract Equations of motion for a Zener model describing a viscoelastic rod are investigated and conditions ensuring the existence, uniqueness and regularity properties of solutions are obtained. Restrictions on the coefficients in the constitutive equation are determined by a weak form of the dissipation inequality. Various stochastic processes related to the Karhunen-Loéve expansion theorem are presented as a model for random perturbances. Results show that displacement disturbances propagate with an infinite speed. Some corrections of already published results for a non-stochastic model are also provided.

scholarly journals Linearization threshold condition and stability analysis of a stochastic dynamic model of one-machine infinite-bus (OMIB) power systems

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Lijuan Li ◽  
Yongdong Chen ◽  
Bin Zhou ◽  
Hongliang Liu ◽  
Yongfei Liu
Keyword(s):  
Power Systems ◽  
Power System ◽  
Dynamic Model ◽  
Threshold Model ◽  
Security Evaluation ◽  
Stochastic Dynamic ◽  
Threshold Condition ◽  
Stochastic Excitation ◽  
Predictor Corrector ◽  
One Machine

AbstractWith the increase in the proportion of multiple renewable energy sources, power electronics equipment and new loads, power systems are gradually evolving towards the integration of multi-energy, multi-network and multi-subject affected by more stochastic excitation with greater intensity. There is a problem of establishing an effective stochastic dynamic model and algorithm under different stochastic excitation intensities. A Milstein-Euler predictor-corrector method for a nonlinear and linearized stochastic dynamic model of a power system is constructed to numerically discretize the models. The optimal threshold model of stochastic excitation intensity for linearizing the nonlinear stochastic dynamic model is proposed to obtain the corresponding linearization threshold condition. The simulation results of one-machine infinite-bus (OMIB) systems show the correctness and rationality of the predictor-corrector method and the linearization threshold condition for the power system stochastic dynamic model. This study provides a reference for stochastic modelling and efficient simulation of power systems with multiple stochastic excitations and has important application value for stability judgment and security evaluation.

Sign in / Sign up

Export Citation Format

Share Document