From the perspective of the development of high-speed railway engineering, the development of high-speed railways in China was briefly reviewed to demonstrate that China must closely combine engineering technology and engineering science, so as to take a lead in high-speed railway engineering. The ...

The levitation frame is a key subsystem that carries EMS (electro-magnetic suspension) medium−low-speed maglev trains, which affects the levitation stability, comfort and safety of the train and needs to be studied in depth. According to domestic and overseas current application cases of EMS medium-...

The electrodynamic suspension (EDS) train has the advantages of high speed, large suspension gap, and high safety factor. It has a bright application prospect in the field of ultra-high-speed maglev trains. The on-board superconducting magnet is one of the core components of the superconducting EDS ...

In order to reduce the excessive power consumption of vehicle electromagnetic active suspension, a modified linear quadratic regulator (LQR) control strategy considering energy consumption was raised. Firstly, the structure of electromagnetic active suspension was introduced. The thrust model of the...

At present, the decoupling control research on maglev rotor systems is mainly based on rigid rotor systems, but the elastic mode of the rotor cannot be ignored under high speed and high support stiffness. Aiming at the decoupling control problem of maglev flexible rotors, this paper first built a fl...

In order to improve the overall performance of the ultra-high speed permanent magnet electrodynamic suspension system, multi-objective performance optimization was carried out based on three important indexes: lift-to-weight ratio, lift-to-drag ratio, and suspension stiffness. Firstly, the transvers...

To study the power generation characteristics of linear harmonic generators for high-speed maglev trains, based on the space harmonic method, the magnetomotive force distribution model of superconducting coils is proposed, and the magnetic induction intensity distribution formula of superconducting ...

Electromagnet provides suspension force for medium−low-speed maglev train. When the electromagnet moves relatively to a rail, eddy current is generated on the rail. The external magnetic field generated by the track eddy current offsets part of the original magnetic field generated by the electromag...

A self-learning model reference adaptive control strategy was proposed to solve the problems of unknown nonlinear force and uncertain transfer function of levitation controllers, which were caused by track irregularity in electromagnetic levitation trains. The tunable parameters in the control algor...

In order to investigate the effect of the scale of a tube train on wave systems, wake vortices, and aerodynamic loads, three model scales (1∶1, 1∶5, and 1∶10) were established based on computational fluid dynamics（CFD） software, and two types of suspension gap relationships (constant relative gap be...

Extracorporeal membrane oxygenation (ECMO) can replace human heart and lung work and create opportunities to save lives. ECMO has made outstanding achievements in defending against the novel coronavirus pneumonia and has thus been called a lifesaving appliance. In view of the power source of ECMO, n...

In order to improve the levitation force and enhance the safety of high-temperature superconducting pinned maglev trains, an improved rail-holding suspension frame system was proposed. Firstly, the levitation force between high-temperature superconductor arrays and permanent magnet guideways was cal...

In order to solve model uncertainty and susceptibility to external disturbances of the maglev ball system, a global fast terminal sliding mode control (GFTSMC) method based on a terminal sliding mode disturbance observer (TSMDO) was proposed. Firstly, the mathematical model of the maglev ball system...

To investigate the quasi-static force-relaxation characteristics of a YBCO bulk levitated above a Halbach permanent-magnetic guideway, using the top-seed-melt-texture-growth method, the complete relaxation process is defined and divided into the excitation process (involved initial state, dynamics p...

A novel permanent magnet electrodynamic suspension system is proposed to improve the guidance ability and reduce the drag force. First, a three-dimensional electromagnetic-force analytical model considering the longitudinal end-edge effect of the magnets is established and solved. Second, a three-di...

In order to explore the influence of the electromagnet remanence on the vertical electromagnetic force of EMS medium−low-speed maglev train, firstly, the change rule of the relative permeability of electromagnet is analyzed, and the levitation model of a single electromagnet is established based on ...

In order to analyze the electromagnetic force characteristics of high-speed maglev electromagnets more accurately and efficiently and achieve good matching with control and dynamics models, a modeling method of electromagnetic force of high-speed maglev electromagnets based on nonlinear materials wa...

In order to effectively reduce the natural frequency of systems and realize the strong attenuation of external vibrations in multiple frequency bands, a magnetic suspension vibration isolation platform with quasi-zero stiffness was designed, in which the permanent-magnet and electromagnetic hybrid a...

Traditional magnetorheological dampers involve sedimentary working media, high sealing requirements, rapidly increasing damper stiffness, and serious energy consumption attenuation under medium- and high-frequency excitation. In order to address these problems, a magnetorheological composite materia...

In order to detect data-driven anomalies of the suspension system in medium-speed maglev trains, firstly, the paper introduced an anomaly detection method based on parameterized residuals. Secondly, in response to the lack of prior information on anomalies in the current suspension system, the paper...

Based on the newly discovered interaction behavior between a permanent magnet and a superconducting coil, a novel superconducting energy conversion/storage device is proposed with a structure of a permanent magnet and a closed superconducting coil. Several groups of experiments with different trajec...

This paper aims to improve the torque performance of a flywheel motor and reduce its permanent magnet cost. Firstly, according to the operating mode of the flywheel battery, the design requirements of the flywheel motor were proposed, and the output torque, torque ripple, and consumption of permanen...

A novel magnetic spring element with high static stiffness and low dynamic stiffness was designed to address the conflict between low natural frequency and high bearing capacity in the field of low-frequency vibration isolation. First, the spring force and stiffness models of the magnetic spring wer...

Magnetic fluid seal of integrated pole shoe has promising prospect. To study the factors affecting its pressure resistance, the structural parameters of the integrated pole shoe are analyzed. First, the pressure resistance formula of the magnetic fluid sealing structure is deduced. Second, the finit...

To determine the mineral separation process for the non-magnetic material precision sorting problem based on the first-order buoyancy of a magnetic fluid, this study examines the stress of non-magnetic objects immersed in a magnetic fluid by changing the distance between the permanent magnet and the...

In order to suppress the unbalance vibration of the rotor system effectively, the electromagnetic damper considering dynamic stiffness was applied to the rotor system in this paper. Firstly, the motion equations of the rotor system were established and nondimensionalized; secondly, based on the equi...

In order to meet the demand for power supply and signal transmission for maglev vehicle gap sensors, a full-duplex simultaneous wireless power and signal transmission (SWPST) method was proposed. Firstly, the full-duplex SWPST system of the maglev gap sensors was established. The S/LCC compensation ...