scholarly journals Equivalent Inductance Model for the Design Analysis of Electrodynamic Suspension Coils for the Hyperloop

2021 ◽  
Author(s):  
Jungyoul Lim ◽  
Chang-Young Lee ◽  
Ye Jun Oh ◽  
Jeong-Min Jo ◽  
Jin-Ho Lee ◽  
...  
Keyword(s):  
High Speed ◽  
Transient Analysis ◽  
Magnetic Levitation ◽  
Three Dimensional ◽  
Circuit Theory ◽  
3D Finite Element ◽  
Electromagnetic Transient ◽  
3D Finite Element Method ◽  
Electrodynamic Suspension ◽  
Novel Model

Abstract Hyperloop allows for improved transportation efficiency at higher speeds and a lower power consumption. Various magnetic levitation technologies in existing high-speed maglev trains are being considered to overcome speed limitations for the development of Hyperloop, which are driven inside vacuum tubes at 1,200 km/h; and superconducting (SC) electrodynamic suspension (EDS) can provide numerous advantages to Hyperloop. such as enabling stable levitation in high-speed driving without control, and increasing the levitation air gap. However, the analysis of the EDS system requires the electromagnetic transient analysis of complex three-dimensional (3D) features, and its computational load generally limits the use of numerical methods, such as the 3D finite element method (FEM) or dynamic circuit theory; This paper presents a novel model that can rapidly and accurately calculate the frequency-dependent equivalent inductance; and it can model the EDS system with the decoupled resistance-inductance (RL) equations of levitation coils. As a design example, the levitation coils of the SC-EDS were designed and analyzed for the Hyperloop, and the results were compared with those of the FEM results to validate the model. In addition, the model was experimentally validated by measuring currents induced by moving pods.

scholarly journals Equivalent inductance model for the design analysis of electrodynamic suspension coils for hyperloop

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jungyoul Lim ◽  
Chang-Young Lee ◽  
Ye Jun Oh ◽  
Jeong-Min Jo ◽  
Jin-Ho Lee ◽  
...  
Keyword(s):  
High Speed ◽  
Magnetic Levitation ◽  
Three Dimensional ◽  
Stability And Control ◽  
Levitation System ◽  
Subsonic Speed ◽  
3D Finite Element Method ◽  
And Control ◽  
Electrodynamic Suspension ◽  
Novel Model

AbstractHyperloop is a new concept of ground transportation. In Hyperloop, travelling occurs in near-vacuum tubes under 0.001 atm at a subsonic speed of up to 1200 km/h. During acceleration to and driving at a subsonic speed, magnetic levitation is employed. Thus far, various levitation technologies in existing high-speed maglev trains have been considered. Among those technologies, superconducting (SC) electrodynamic suspension (EDS) is a highly effective levitation system for Hyperloop owing to its advantages of a large levitation gap, levitation stability, and control being unnecessary. However, analyzing an EDS system requires the electromagnetic transient analysis of complex three-dimensional (3D) features, and its computational load generally limits the use of numerical methods, such as the 3D finite element method (FEM) or dynamic circuit theory. In this study, a novel model that can rapidly and accurately calculate the frequency-dependent equivalent inductance was developed. The developed model was then applied to design an EDS system using the decoupled resistance-inductance equations of levitation coils. Next, levitation coils of SC-EDS were designed and analyzed for use in Hyperloop. The obtained results were compared with the FEM results to validate the developed model. In addition, the model was experimentally validated by measuring currents induced by moving pods.

scholarly journals Design Model of Null-Flux Coil Electrodynamic Suspension for the Hyperloop

Energies ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 5075
Author(s):  
Jungyoul Lim ◽  
Chang-Young Lee ◽  
Jin-Ho Lee ◽  
Wonhee You ◽  
Kwan-Sup Lee ◽  
...  
Keyword(s):  
High Speed ◽  
Magnetic Levitation ◽  
Coupling Effect ◽  
Superconducting Magnets ◽  
Design Model ◽  
Maximum Speed ◽  
Closed Form Solutions ◽  
Design Variables ◽  
3D Finite Element Method ◽  
Electrodynamic Suspension

The Hyperloop has been developed using various technologies to reach a maximum speed of 1200 km/h. Such technologies include magnetic levitation technologies that are suitable for subsonic driving. In the Hyperloop, the null-flux electrodynamic suspension (EDS) system and superconducting magnets (SCMs) can perform stable levitation without control during high-speed driving. Although an EDS device can be accurately analyzed using numerical analysis methods, such as the 3D finite element method (FEM) or dynamic circuitry theory, its 3D configurations make it difficult to use in various design analyses. This paper presents a new design model that fast analyzes and compares many designs of null-flux EDS devices for the Hyperloop system. For a fast and effective evaluation of various levitation coil shapes and arrangements, the computational process of the induced electromotive force and the coupling effect were simplified using a 2D rectangular coil loop, and the induced current and force equations were written as closed-form solutions using the Fourier analysis. Also, levitation coils were designed, and their characteristics were analyzed and compared with each other. To validate the proposed model, the analyzed force responses for various driving conditions and the changed performance trend by design variables were compared with analyzed FEM results.

scholarly journals Design and Analysis of a Plate Type Electrodynamic Suspension Structure for Ground High Speed Systems

Symmetry ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1117 ◽  
Author(s):  
Zhaoyu Guo ◽  
Danfeng Zhou ◽  
Qiang Chen ◽  
Peichang Yu ◽  
Jie Li
Keyword(s):  
High Speed ◽  
Permanent Magnets ◽  
Superconducting Magnets ◽  
Three Dimensional ◽  
Vehicle Velocity ◽  
Working Principle ◽  
3D Finite Element Method ◽  
Electrodynamic Suspension ◽  
Suspension Structure ◽  
Plate Type

The research of ground high speed systems has been popular, especially after the announcement of Hyperloop concept, and the analysis of the suspension structure is critical for the design of the system. This paper focuses on the design and analysis of a plate type electrodynamic suspension (EDS) structure for the ground high speed system. The working principle of proposed whole system with functions of levitation, guidance and propulsion is presented, and the researched EDS structure is composed of permanent magnets (or superconducting magnets) and non-ferromagnetic conductive plates. Levitation and guidance are achieved by forces generated through the motion of the magnets along the plates. The plate type EDS structure is analyzed by three-dimensional (3D) finite element method (FEM) in ANSYS Maxwell. Structure parameters that affect the EDS performances are investigated, which include dimensions of magnets and plates, plate material, the relative position between magnets and plates, and arrangement of magnets. The properties of forces are discussed, especially for the levitation force, and the levitation working point is decided based on the analysis. Levitation-drag ratio of the plate type structure is investigated, and it improves with the increasing of vehicle velocity. The analysis results indicate that the plate type EDS structure is feasible for applications in ground high speed systems. The following study will focus on the dynamic research of the EDS system.

Three‐dimensional solution of high‐speed magnetic levitation problems

1982 ◽  
Vol 53 (11) ◽  
pp. 8417-8419 ◽  
Author(s):  
A. Nicolas ◽  
J. C. Sabonnadière ◽  
P. P. Silvester
Keyword(s):  
High Speed ◽  
Magnetic Levitation ◽  
Three Dimensional ◽  
Dimensional Solution

Influence of Side Stringer to Deck Deformation of Four-Lines High-Speed Railway Cable-Stayed Bridge with Double Cable Planes

2012 ◽  
Vol 178-181 ◽  
pp. 2462-2467
Author(s):  
Jiong Liang ◽  
Mei Xin Ye
Keyword(s):  
High Speed ◽  
Short Wave ◽  
Axial Stiffness ◽  
High Speed Railway ◽  
3D Finite Element ◽  
Cable Stayed Bridge ◽  
Long Wave ◽  
Transversal Wave ◽  
Wave Change ◽  
3D Finite Element Method

Taking Beijiang Bridge as an example, using 3D finite element method, influence of side stringer to deck deformation of four-lines high-speed railway cable-stayed bridge with double cable planes is studied. The results show that the stiffness of the side stringer hardly influence the long wave of bridge deformation and the ratio of deflection to span, but significantly affects the short wave and transversal wave of the bridge deformation. The location of the side stringer influences the long wave slightly, but influences the short wave and transversal wave significantly. If the distance between the side stringer and the center of the main trusses changed, the long wave changes slightly, while the maximum short wave and transversal wave change a lot. The larger the distance, the less the transversal span of the deck and panel beams are, and the less the short wave and transversal wave are. The influence of the axial stiffness of horizontal K-shaped brace to the bridge deformation is small.

A Dynamics Simulation for a High Speed Magnetically Levitated Guided Ground Vehicle

1979 ◽  
Vol 101 (3) ◽  
pp. 223-229 ◽  
Author(s):  
D. B. Cherchas
Keyword(s):  
Mathematical Model ◽  
High Speed ◽  
Degrees Of Freedom ◽  
Magnetic Levitation ◽  
Dynamics Simulation ◽  
Vehicle Suspension ◽  
Ground Vehicle ◽  
Aerodynamic Loading ◽  
The Mathematical Model ◽  
Electrodynamic Suspension

An analysis and digital computer program are developed to simulate vehicle and guideway dynamic response. The magnetic levitation is of the electrodynamic suspension type. The mathematical model includes effects of the following: vehicle and guideway flexible deformations, vehicle suspension and propulsion pod translation relative to the vehicle, multiple guideway spans and aerodynamic loading. The simulation is programmed in such a way that the number of sequential spans over which the vehicle travels can be increased without increasing the degrees of freedom in the simulation. Illustrative results of the simulation are presented.

Vibration Analysis of Shallow Spherical Domes with Non-Uniform Thickness

2017 ◽  
Vol 17 (02) ◽  
pp. 1750016 ◽  
Author(s):  
Jae-Hoon Kang
Keyword(s):  
Vibration Analysis ◽  
Present Method ◽  
Shell Theory ◽  
Natural Frequencies ◽  
Ritz Method ◽  
Three Dimensional ◽  
Algebraic Polynomials ◽  
Uniform Thickness ◽  
3D Finite Element ◽  
3D Finite Element Method

A three-dimensional (3D) method of analysis is presented for determining the natural frequencies of shallow spherical domes with non-uniform thickness. Unlike conventional shell theories, which are mathematically two dimensional (2D), the present method is based upon the 3D dynamic equations of elasticity. Displacement components [Formula: see text], [Formula: see text], and [Formula: see text] in the meridional, circumferential, and normal directions, respectively, are taken to be periodic in [Formula: see text] and in time, and algebraic polynomials in the [Formula: see text] and z directions. Potential (strain) and kinetic energies of the shallow spherical domes with non-uniform thickness are formulated, and the Ritz method is used to solve the eigenvalue problem, thus yielding upper bound values of the frequencies by minimizing the frequencies. As the degree of the polynomials is increased, frequencies converge to the exact values. Convergence to four-digit exactitude is demonstrated for the first five frequencies. Natural frequencies are presented for different boundary conditions. The frequencies from the present 3D method are compared with those from a 2D exact method, a 2D thick shell theory, and a 3D finite element method by previous researchers.

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