scholarly journals Effect of Pantograph’s Main Structure on the Contact Quality in High-Speed Railway

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Jiangwen Wang ◽  
Guiming Mei
Keyword(s):  
Contact Force ◽  
Structural Design ◽  
High Speed ◽  
Electrical Energy ◽  
Dynamic Contact ◽  
Sine Series ◽  
High Speed Railway ◽  
Main Structure ◽  
Current Collection ◽  
Relative Coordinates

In general, the electrical energy is provided to the high-speed train through the pantograph-catenary sliding contact. The variation of the dynamic contact force is expected to be small enough to keep the good current collection quality and to extend the service life of the pantograph-catenary system. In this paper, the two tension wires of the catenary are discretized by the sine-series expansions, a multibody dynamics theory based on relative coordinates is adopted to describe the dynamic behavior of the pantograph, and the standard deviation (STD) of dynamic contact force is used as the indicator to evaluate the contact quality. The objective is to investigate how the variations of the pantograph’s main structure influence the contact quality, which may support the structural design and parameter optimization of the pantograph in high-speed railway.

Measuring Model of Dynamic Contact Force

2012 ◽  
Vol 503-504 ◽  
pp. 1614-1618
Author(s):  
Zhong Guo Sun ◽  
Xiang Dong Li ◽  
Wei Dong Wang
Keyword(s):  
Contact Force ◽  
High Speed ◽  
Dynamic Contact ◽  
Overhead Line ◽  
Mass Correction

There are no systematic studies reported on measuring model of dynamic contact force between pantograph and overhead line. Keep this in view, the high-speed measuring model of dynamic contact force between pantograph and overhead line is discussed in details in this article. Based on the analysis of forces acting on the pantograph, measuring model of dynamic contact force is constructed with the mass correction and aerodynamic compensation. The results of verifying running test are given in the end of article to show that the measuring model is effective practically.

Computer Evaluation of Controlled Pantographs for Current Collection From Simple Catenary Overhead Equipment at High Speed

1983 ◽  
Vol 105 (4) ◽  
pp. 287-294 ◽  
Author(s):  
T. Vinayagalingam
Keyword(s):  
Contact Force ◽  
High Speed ◽  
Overhead Line ◽  
Combined System ◽  
Current Collection ◽  
Constant Height ◽  
Force Profile ◽  
Force Variation ◽  
Computer Simulation Technique

A digital computer simulation technique is used to study the effects of changing pantograph characteristics upon the quality of current collection from simple catenary overhead equipment at high speed. In particular, the likely benefits to be derived by the use of controlled pantographs are assessed. Pantograph performance is judged on the basis of contact force variation and displacement responses of pantograph and contact wire. These studies have shown that the dynamic displacements of the combined system are determined primarily by the overhead line parameters rather than by the pantograph. At higher speeds droppers in the vicinity of the pantograph slacken and this is seen to influence significantly the contact force profile. On a “constant height” overhead line, the proposed “frame compensated” and “panhead inertia compensated” pantographs do not show any marked improvement in the quality of current collection.

Active Control of Fuzzy for High-Speed Pantograph

2012 ◽  
Vol 251 ◽  
pp. 158-163 ◽  
Author(s):  
Gang Yang ◽  
Zhong Mei Dai ◽  
Fu Li ◽  
Zheng Zhi Luo
Keyword(s):  
Active Control ◽  
Contact Force ◽  
High Speed ◽  
Fuzzy Controller ◽  
Current Collection ◽  
Maximum Value ◽  
Dynamic Performances ◽  
Catenary System ◽  
The Impact

The regular current collection is very important for high-speed train， and can be obviously improved by the use of active control. In order to study the impact of the fuzzy active control on pantograph-catenary system, the model ohe simulation model is created with the software of simulink. Finally the influences of fuzzy active control on dynamic performances and quality of current collection of the pantograph-catenary system are analyzed. It seems that, the performances of the system with or without active control is established, the fuzzy controller is constructed, and tf the pantograph- catenary system can be improved obviously under the fuzzy active control, the maximum value of the contact force is reduced to 50 percent, the minimum is increased to 80 percent, and the fluctuation extent of the contact force is reduced to 70 percent.

scholarly journals Sliding Mode Control with PD Sliding Surface for High-Speed Railway Pantograph-Catenary Contact Force under Strong Stochastic Wind Field

2017 ◽  
Vol 2017 ◽  
pp. 1-16 ◽  
Author(s):  
Yang Song ◽  
Zhigang Liu ◽  
Huajiang Ouyang ◽  
Hongrui Wang ◽  
Xiaobing Lu
Keyword(s):  
Contact Force ◽  
Wind Field ◽  
High Speed ◽  
Sliding Mode ◽  
External Disturbance ◽  
Mechanical Impedance ◽  
Sliding Surface ◽  
High Speed Railway ◽  
Switching Law ◽  
Catenary System

As is well known, the external disturbance (especially the stochastic wind load) has nonnegligible effect on the operation of pantograph-catenary system, which may cause the strong fluctuation in contact force as well as the increased occurrence of contact loss. In order to improve the current collection quality of a high-speed railway pantograph-catenary system under a strong stochastic wind field, a sliding mode controller with a proportional-derivative (PD) sliding surface for a high-speed active pantograph is proposed. The nonlinear finite element procedure is employed to establish the catenary model. The fluctuating wind speeds along catenary are simulated using empirical spectrums. The buffeting forces exerted on contact and messenger wires are derived to construct the stochastic wind field along the catenary. A PD sliding surface is properly determined to guarantee that the mechanical impedance of pantograph head at the dominant frequencies of contact force decreases when the sliding surface approaches zero. Through several numerical simulations with different wind velocities and wind angles, the control performance of two popular control laws (proportional switching law and constant switching law) is evaluated.

Study on Dynamic Performance of High Spot Open-Closed Gripper Mechanism in Printing Machine

2009 ◽  
Vol 419-420 ◽  
pp. 317-320
Author(s):  
Guo Dong Liu ◽  
Lin Lin Liu ◽  
Lei Zhang
Keyword(s):  
Contact Force ◽  
Relative Motion ◽  
Analytical Method ◽  
Structural Design ◽  
Mechanical Model ◽  
High Speed ◽  
Dynamic Performance ◽  
Force Contact ◽  
Printing Machine ◽  
Peak Value

The paper aims at attacking and noise problems of high spot open-closed gripper mechanism in printing machine in a high speed situation. The analytical method of dynamic performance is presented based on the relative motion, the absolute motion, and the mechanical model. And the analytical equations are established. Then, the dynamic performance of a practical mechanism from XINJI Company is analyzed by the proposed method. The drawbacks of dynamic performance are pointed out that the acceleration and apparent force had jumps in the running process. Finally, on the basis of existed problems, dynamic performance is modified by means of structural design of cam. The analytical results show that the angular acceleration’s peak value of improvement mechanism has been decreased by 62%. Besides, the modified mechanism also expresses an excellent dynamic performance as the flat curve of acceleration, apparent force, contact force and hinge force.

Considerations on Dynamic Contact Force with Catenary for the EP3 Pantograph

2015 ◽  
Vol 809-810 ◽  
pp. 1121-1126 ◽  
Author(s):  
Ioan Sebeşan ◽  
Sorin Arsene
Keyword(s):  
Contact Pressure ◽  
Contact Force ◽  
Contact Line ◽  
Power Supply ◽  
High Performance ◽  
Dynamic Contact ◽  
The Body ◽  
Vertical Movements ◽  
Current Collection ◽  
Force Variation

Power supply the energy needed for locomotives and electric trains is performed by means of pantographs on the bodywork. These high performance producing vehicles in so far as the contact between the collector (pantograph) and the catenary (contact line) is achieved and maintained regardless of speed. Thanks to the constructive type of the pantograph and the location of the contact force varies in relation to speed and can give rise to phenomena of oscillators that enhances the vertical movements of the wire feeder. As such the problem is essential for a good current collection is dynamic in nature. The most favorable way of current collection is achieved when between full and contact wire can maintain contact through a permanent and constant contact, a situation difficult to achieve in practice because of the first bump of the contact line. Juddering movements in vehicle while walking to a modification of the contact pressure which, however, it was found that is negligible in relation to the wave-like movements of the contact line. This article has looked at what is the dynamic contact force variation where the pantograph is located on the body of the locomotive EP3 LE 060 EA of 5100 kW. For this I started from the constructive characteristics of the components of the pantograph.

Active control of contact force for high-speed railway pantograph-catenary based on multi-body pantograph model

2017 ◽  
Vol 115 ◽  
pp. 35-59 ◽  
Author(s):  
Yang Song ◽  
Huajiang Ouyang ◽  
Zhigang Liu ◽  
Guiming Mei ◽  
Hongrui Wang ◽  
...  
Keyword(s):  
Active Control ◽  
Contact Force ◽  
High Speed ◽  
High Speed Railway ◽  
Multi Body

Structural Design and Stress Analysis of a High-Speed Turbogenerator Assembly Supported by Hydrodynamic Bearings

2020 ◽  
Vol 10 (1) ◽  
pp. 54-67
Author(s):  
Rodrigo Teixeira Bento ◽  
André Ferrus Filho ◽  
Marco Antonio Fumagalli
Keyword(s):  
Structural Design ◽  
High Speed ◽  
Fem Analysis ◽  
Electrical Energy ◽  
Von Mises Stress ◽  
Bronze Alloy ◽  
Hydrodynamic Bearings ◽  
Hydrodynamic Bearing ◽  
Critical Components ◽  
Von Mises

Turbine and bushing bearing are the most critical components of high-speed machines. This article describes the design of a high-speed turbine supported by hydrodynamic bearings. The mathematical dimensioning and the FEM analysis are presented to validate the mechanical strength of the turbine and the bushing bearing models. Fatigue life and factor of safety were also determined. The simulations showed that the maximum Von Mises stress values obtained are associated to the centrifugal force generated by the system rotational movement. The results variation was mainly due to the properties of the materials proposed. For the turbine, 7075-T6 aluminum alloy and SAE 4340 steel obtained satisfactory behavior under a constant operating speed of 30,000 RPM. For the hydrodynamic bearing, the TM23 bronze alloy exhibited excellent results, without fracture, and low mechanical deformation. The models exhibited a great potential employment in several applications, such as biogas systems to generate electrical energy, and educational test bench for thermodynamic and tribological simulations.

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