Study on stability and bifurcation of electromagnet-track beam coupling system for EMS maglev vehicle

2020 ◽  
Vol 101 (4) ◽  
pp. 2181-2193
Author(s):  
Xiaohao Chen ◽  
Weihua Ma ◽  
Shihui Luo
Keyword(s):  
Maglev Vehicle ◽  
Stability And Bifurcation ◽  
Coupling System ◽  
Beam Coupling ◽  
Track Beam

scholarly journals Optimal dynamic control for a maglev vehicle moving on multi-span guideway girders

2021 ◽  
Vol 37 ◽  
pp. 373-379
Author(s):  
Linya Liu ◽  
J D Yau ◽  
Jialiang Qin ◽  
S Urushadze
Keyword(s):  
Interaction Analysis ◽  
Dynamic Control ◽  
Moving Vehicle ◽  
Control Effectiveness ◽  
Maglev Vehicle ◽  
Coupling System ◽  
Mass Damper ◽  
Parametric Studies ◽  
Optimal Dynamic ◽  
Magnetic Oscillations

Abstract An optimal control algorithm using a virtual tuned mass damper called virtual TMD to control the levitation force of a magnetic system is developed for resonance suppression of a maglev vehicle moving on multi-span guideway girders. Since the optimal dynamic parameters of a TMD in vibration control are well developed, the optimal tuning gains required to control the magnetic oscillations of the maglev bogie can be directly used and fed back to the maglev control system. To address the dynamic interaction analysis from the maglev vehicle to the guideway girders and vice versa, the entire coupling system is decomposed into two subsystems, one is the moving vehicle subsystem and another the stationary guideway subsystem. Then, an incremental–iterative procedure associated with the Newmark method is presented to solve the two sets of subsystem equations. Finally, the control effectiveness and parametric studies of the optimal virtual TMD scheme on resonance reduction of the moving maglev vehicle are demonstrated.

Analysis of dynamic response of the high-speed EMS maglev vehicle/guideway coupling system with random irregularity

2007 ◽  
Vol 45 (12) ◽  
pp. 1077-1095 ◽  
Author(s):  
Jin Shi ◽  
Qingchao Wei ◽  
Yang Zhao
Keyword(s):  
Dynamic Response ◽  
High Speed ◽  
Maglev Vehicle ◽  
Coupling System ◽  
Random Irregularity

A numerical model to predict three-dimensional interaction dynamic of low-medium-speed maglev vehicle–guideway bridge system

2021 ◽  
pp. 095440972199655
Author(s):  
Fenghua Huang ◽  
Bin Cheng ◽  
Nianguan Teng
Keyword(s):  
Numerical Model ◽  
Dynamic Responses ◽  
Vehicle Speed ◽  
3D Interaction ◽  
Frequency Responses ◽  
Maglev Vehicle ◽  
Coupling System ◽  
Medium Speed ◽  
Vibration Responses ◽  
Bridge System

This paper established a numerical model to investigate the dynamic behavior of LMS (low-medium-speed) maglev vehicle-guideway bridge coupling system. In this model, the vehicle was simulated as a 3D (3-dimensional) multi-rigid body with 45 DOFs (degree of freedoms), and the guideway bridge was built through finite element method. Two-dimensional magnet-guideway relationship was introduced, and the control strategies of active suspension control based on PID controller and passive guidance control were employed to reflect the vehicle-guideway interaction. A solution program was then developed to solve the vehicle-guideway interaction problem. Through case study, the vibration responses achieved from 3D interaction model were compared to those from corresponding 2D (2-dimensional) model. Besides, the effects of pier and guideway irregularity on dynamic responses of vehicle-guideway bridge coupling system were investigated, and the frequency responses of vehicle and guideway were also analyzed. The result shows that ignoring the pier modeling or guideway irregularity would significantly undervalue the vibration responses of maglev vehicle-guideway bridge interaction system. The frequency responses indicate that the vibrations of vehicle-guideway bridge system are significantly related to the geometric dimensions of maglev vehicle, especially the distance between two magnet units. Finally, parametric study was carried out to determine the effects of key parameters (i.e., vehicle speed and natural frequency of guideway) on guideway responses.

Modeling and Simulation of High-speed Maglev Vehicle/Guideway/Bridge Coupling System

2006 ◽  
Author(s):  
Deng Yashi ◽  
Wei Qingchao ◽  
Ni Yongjun ◽  
Shi Jin
Keyword(s):  
Modeling And Simulation ◽  
High Speed ◽  
Maglev Vehicle ◽  
Coupling System

scholarly journals Theoretical and Numerical Analysis of 1 : 1 Main Parametric Resonance of Stayed Cable Considering Cable-Beam Coupling

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Li-Na Zhang ◽  
Feng-Chen Li ◽  
Xiao-Yong Wang ◽  
Peng-Fei Cui
Keyword(s):  
Parametric Resonance ◽  
Simulation Analysis ◽  
Resonance Condition ◽  
Excitation Amplitude ◽  
Initial Displacement ◽  
Approximation Solution ◽  
Coupling Vibration ◽  
Coupling System ◽  
Beam Coupling ◽  
Parametric Resonances

For the 1 : 1 main parametric resonances problems of cable-bridge coupling vibration, a main parametric resonances model considering cable-beam coupling is developed and dimensionless parametric resonances differential equations are derived. The main parametric resonances characteristics are discussed by means of multiscale approximation solution methods. Using an actual cable of cable-stayed bridge project for research object, numerical simulation analysis under a variety of conditions is illustrated. The results show that when the coupling system causes 1 : 1 parametric resonance, nonlinear main parametric resonances in response are unrelated to initial displacement of the cable, but with the increase of deck beam end vertical initial displacement increases, accompanied with a considerable “beat” vibration. When the vertical initial displacement of deck beam end is 10−6 m order of magnitude or even smaller, “beat” vibration phenomenon of cable and beam appears. Displacement amplitude of the cable is small and considerable amplitude vibration may not occur at this time, only making a slight stable “beat” vibration in the vicinity of the equilibrium position, which is different from 2 : 1 parametric resonance condition of cable-bridge coupling system. Therefore, it is necessary to limit the initial displacement excitation amplitude of beam end and prevent the occurrence of amplitude main parametric excitation resonances.

scholarly journals A Coupling Vibration Test Bench and the Simulation Research of a Maglev Vehicle

2015 ◽  
Vol 2015 ◽  
pp. 1-14 ◽  
Author(s):  
Weihua Ma ◽  
Rongrong Song ◽  
Junqi Xu ◽  
Yu Zang ◽  
Shihui Luo
Keyword(s):  
Test Bench ◽  
Dynamics Simulation ◽  
Dynamics Model ◽  
Simulation Research ◽  
Coupling Vibration ◽  
Maglev Vehicle ◽  
Levitation System ◽  
Track Irregularity ◽  
Simulation Results ◽  
Track Beam

To study the characteristics of the coupling vibration between a maglev vehicle and its track beam system and to improve the performance of the levitation system, a new type of vibration test bench was developed. Take a single maglev frame as the study object; simulation of the coupling vibration of the maglev vehicle, levitation system, and track beam were achieved. In addition, all types of real track irregularity excitations can be simulated using hydraulic actuators of the test bench. To expand the research scope, a simulation model was developed that can conduct the simulation research synergistically with the test bench. Based on a dynamics model of the test bench, the dynamics simulation method determined the influence on the levitation control performance of three factors: the track beam support stiffness, the track beam mass, and the track irregularity. The vibration resonance phenomenon of the vehicle/track system was reproduced by the dynamics simulation, and a portion of the simulation results were validated by the test results. By combining the test bench and the dynamics model, experiments can be guided by the simulation results, and the experimental results can validate the dynamics simulation results.

Ultrastructural Localization of Acid Mucosubstance in Skeletal Muscle

1967 ◽  
Vol 25 ◽  
pp. 52-53 ◽  
Author(s):  
William J. Dougherty ◽  
Samuel S. Spicer
Keyword(s):  
Striated Muscle ◽  
Divalent Cations ◽  
Ultrastructural Localization ◽  
Major Elements ◽  
Frozen Sections ◽  
Thorium Dioxide ◽  
Iron Solution ◽  
Coupling System ◽  
Psoas Muscles ◽  
Formalin Fixed

In recent years, considerable attention has focused on the morphological nature of the excitation-contraction coupling system of striated muscle. Since the study of Porter and Palade, it has become evident that the sarcoplastic reticulum (SR) and transverse tubules constitute the major elements of this system. The problem still exists, however, of determining the mechamisms by which the signal to interdigitate is presented to the thick and thin myofilaments. This problem appears to center on the movement of Ca++ions between myofilaments and SR. Recently, Philpott and Goldstein reported acid mucosubstance associated with the SR of fish branchial muscle using the colloidal thorium dioxide technique, and suggested that this material may serve to bind or release divalent cations such as Ca++. In the present study, Hale's iron solution adapted to electron microscopy was applied to formalin-fixed myofibrils isolated from glycerol-extracted rabbit psoas muscles and to frozen sections of formalin-fixed rat psoas muscles.

Dynamic analysis and optimization of electromechanical coupling system

2006 ◽  
Author(s):  
Wu JianXin ◽  
Li Qiang ◽  
Zhao WeiGuo ◽  
Sun Yan
Keyword(s):  
Dynamic Analysis ◽  
Electromechanical Coupling ◽  
Coupling System
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