Dynamic stability of an electromagnetic suspension maglev vehicle under steady aerodynamic load

2021 ◽  
Author(s):  
Han Wu ◽  
Xiao-Hui Zeng ◽  
Ding-Gang Gao ◽  
Jiang Lai
Keyword(s):  
Dynamic Stability ◽  
Aerodynamic Load ◽  
Electromagnetic Suspension ◽  
Maglev Vehicle

Vibration analysis of a maglev vehicle using electromagnetic suspension

2007 ◽  
Author(s):  
Hyungsuk Han ◽  
Bonghyuk Yim ◽  
Namjin Lee ◽  
Youngchul Hur ◽  
Jungil Kwon
Keyword(s):  
Vibration Analysis ◽  
Electromagnetic Suspension ◽  
Maglev Vehicle

Acceleration Compensating Fuzzy Control in Magnetic Suspension System

2012 ◽  
Vol 468-471 ◽  
pp. 64-68 ◽  
Author(s):  
He Xiang Liu ◽  
Hai Tao Yu ◽  
Min Qiang Hu ◽  
Lei Huang ◽  
Li Yu
Keyword(s):  
Fuzzy Control ◽  
Dynamic Stability ◽  
Degrees Of Freedom ◽  
Suspension System ◽  
Magnetic Suspension ◽  
Linear Dynamics ◽  
Control Approach ◽  
Multiple Degrees Of Freedom ◽  
Electromagnetic Suspension ◽  
Magnetic Suspension System

In this paper, an acceleration compensating control approach is used for dealing with the non-linear dynamics of a multiple degrees of freedom electromagnetic suspension system. This method not only has simple configuration and is implement easily, but also improves the performance of the dynamic stability and the anti-jamming capability. Simulations on the magnetic suspension demonstrated the efficiency of proposed method.

scholarly journals Aerodynamic Analysis of Pressure Wave of High-Speed Maglev Vehicle Crossing: Modeling and Calculation

Energies ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3770
Author(s):  
Gao ◽  
Ni ◽  
Lin ◽  
Luo ◽  
Ji
Keyword(s):  
Pressure Wave ◽  
High Speed ◽  
Calculation Model ◽  
The Body ◽  
Aerodynamic Load ◽  
Maglev Train ◽  
Aerodynamic Analysis ◽  
Simulation Techniques ◽  
Maglev Vehicle ◽  
Full Speed

When two maglev trains travel in opposite directions on two adjacent tracks, train crossingis inevitable. Especially when both trains run at full speed, the pressure wave formed by each otherwill have a significant impact on the structure of the vehicle. Therefore, it is important to understandthe pressure distribution on the body surface during the crossing to mitigate impact of the pressurewave. In this work, numerical simulation techniques are employed to reveal the nature of pressurewave during train crossing. Firstly, the aerodynamic load calculation model and the pressure wavecalculation model are established, based on the turbulence model and flow field control equation.Secondly, the governing equations are discretized together with determined correspondingboundary conditions, which leads to an effective numerical analysis method. Finally, thecorresponding aerodynamic analysis is carried out for the high-speed maglev test vehicle runningat speed 500 km/h on the open-air line. The simulation results reveal that the spot which sustainsthe most pressure fluctuation is at the widest part of the vehicle during the train crossing. This formsvaluable insights on the aerodynamic nature of high-speed maglev train and provides necessaryinputs to the structural design of the vehicle.

Effect of Aerodynamic Loads on Dynamic Stability of Slender Launch Vehicle Subjected to an End Rocket Thrust

2002 ◽  
Author(s):  
Tsukasa Ohshima ◽  
Yoshihiko Sugiyama
Keyword(s):  
Stability Analysis ◽  
Dynamic Stability ◽  
Longitudinal Axis ◽  
Launch Vehicle ◽  
Aerodynamic Load ◽  
Aerodynamic Loads ◽  
Eigen Values ◽  
Rocket Thrust ◽  
The Stability ◽  
Free Beam

This paper deals with dynamic stability of a slender launch vehicle subjected to aerodynamic loads and an end rocket thrust. The flight vehicle is simplified into a uniform free-free beam subjected to an end follower thrust. Two types of aerodynamic loads are assumed in the stability analysis. Firstly, it is assumed that two concentrated aerodynamic loads act on the flight body at its nose and tail. Secondly, to take account of effect of unsteady flow due to motion of a flexible flight body, aerodynamic load is estimated by the slender body approximation. Extended Hamilton’s principle is applied to the considered beam for deriving the equation of motion. Application of FEM yields standard eigen-value problem. Dynamic stability of the beam is determined by the sign of the real part of the complex eigen-values. If aerodynamic loads are concentrated loads that act on the flight body at its nose and tail, the flutter thrust decreases by about 10% in comparison with the flutter thrust of free-free beam subjected only to an end follower thrust. If aerodynamic loads are distributed along the longitudinal axis of the flight body, the flutter thrust decreases by about 70% in comparison with the flutter thrust of free-free beam under an end follower thrust. It is found that the flutter thrust is reduced considerably if the aerodynamic loads are taken into account in addition to an end rocket thrust in the stability analysis of slender rocket vehicle.

Evolutionary Hinfin; design of an electromagnetic suspension control system for a maglev vehicle

1997 ◽  
Vol 211 (5) ◽  
pp. 345-355 ◽  
Author(s):  
N V Dakev ◽  
J F Whidborne ◽  
A J Chipperfield ◽  
P J Fleming
Keyword(s):  
Control System ◽  
Evolutionary Algorithm ◽  
Weighting Function ◽  
Design Procedure ◽  
Optimization Techniques ◽  
Electromagnetic Suspension ◽  
Maglev Vehicle ◽  
Potential Benefits ◽  
Mixed Optimization ◽  
Parameter Values

A multiobjective evolutionary algorithm approach is proposed for the H∞ design of an electromagnetic suspension (EMS) control system for a maglev vehicle. The evolutionary algorithm is used in conjunction with an H∞ loop-shaping design procedure to perform multiobjective search over a set of possible weighting function structures and parameter values in order to satisfy a number of conflicting design criteria. It is demonstrated that the proposed approach offers a number of potential benefits over other ‘mixed optimization’ techniques by allowing the control engineer to select from a number of satisfactory design solutions of differing complexity.

Molecular insights on the dynamic stability of peptide nucleic acid functionalized carbon and boron nitride nanotubes

2021 ◽  
Vol 23 (1) ◽  
pp. 219-228
Author(s):  
Nabanita Saikia ◽  
Mohamed Taha ◽  
Ravindra Pandey
Keyword(s):  
Nucleic Acid ◽  
Boron Nitride ◽  
Nucleic Acids ◽  
Dynamic Stability ◽  
Peptide Nucleic Acid ◽  
Rational Design ◽  
Peptide Nucleic Acids ◽  
Boron Nitride Nanotubes ◽  
Molecular Hybrids ◽  
Single Wall Nanotubes

The rational design of self-assembled nanobio-molecular hybrids of peptide nucleic acids with single-wall nanotubes rely on understanding how biomolecules recognize and mediate intermolecular interactions with the nanomaterial's surface.

When Rows Look Like Columns: Dynamic Stability of Grouping by Proximity

2000 ◽  
Author(s):  
Helena Kadlec ◽  
Iris Van Rooij ◽  
Valerie A. Gonzales
Keyword(s):  
Dynamic Stability
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