The Vertical Forces Introduced by Wind on the Active Pantograph from Bodywork of Locomotive LE 060 EA of 5100 kW

2015 ◽  
Vol 809-810 ◽  
pp. 1115-1120 ◽  
Author(s):  
Sorin Arsene
Keyword(s):  
Comparative Analysis ◽  
Power Supply ◽  
High Speed ◽  
High Performance ◽  
The Body ◽  
Vehicle Body ◽  
Aerodynamic Forces ◽  
Railway Vehicles ◽  
Railway Traction ◽  
Electric Railway

Gusts of wind with high speed can adversely affect the operation of the electric railway vehicles. These vehicles are able to move and to obtain a high performance, as long as the power supply is ensured. The variation of the vertical forces for maintaining contact between pantograph and catenary may cause interruption of the power supply of the electric railway traction vehicles. The placement of the capture equipment on the vehicle body determines appearance of aerodynamic forces acting on it. To see which are the vertical forces introduced by wind on active capture equipment, used at locomotives LE 060 EA of 5100 kW, we considered the EP3 type of pantograph as model. This was modelled at scale 1:1 taking into account the placement on the body of the locomotive. For the simulation of wind we considered three point values of its speed (10 m/s, 20 m/s, 30 m/s) and angle of eight values that are within the range of 0 deg – 180 deg. With the results of the simulation we have done a comparative analysis on the additional vertical forces introduced by wind for the cases analyzed.

Influence of Wind on the Aerodynamic Resistance for a Case of the Arrangement of the Equipment on Locomotive Bodywork LE 060EA

2015 ◽  
Vol 809-810 ◽  
pp. 1151-1156
Author(s):  
Sorin Arsene
Keyword(s):  
Comparative Analysis ◽  
Cross Section ◽  
Power Supply ◽  
Aerodynamic Resistance ◽  
Flow Simulation ◽  
The Body ◽  
Electric Locomotive ◽  
Aerodynamic Forces ◽  
Cross Section Area ◽  
Section Area

In the case of electric railway vehicles of surface, the equipments which allow power supply are placed on their bodywork. The mode to dispose these equipments contributes to increase the resistance to motion of the vehicle due to the variation cross-section area. Gusts of wind that occurs during the movement of vehicles lead to increased aerodynamic forces. As a model analyzed, we considered the situation determined by the dispose of the equipments supply on the body of electric locomotive type LE 060 EA of 5100 kW, when such a vehicle is travelling with the first post station in the driving direction. The equipment’s components of supply were modeled geometric at scale 1: 1 in 3D. The obtained assembly was imported in an air flow simulation program to determine the aerodynamic resistances. To observe which is the influence of the gusts wind regarding the resistance to moving we considered five point values for wind speed: 5m / s, 10m / s, 15m / s, 20m / s and 25m / s. With results of the simulations we performed a comparative analysis.

Model Predictive Control Application to Flexible-Bodied Railway Vehicles for Vibration Suppression

2013 ◽  
Vol 10 ◽  
pp. 25-35
Author(s):  
P.E. Orukpe
Keyword(s):  
Model Predictive Control ◽  
Predictive Control ◽  
High Speed ◽  
Ride Comfort ◽  
The Body ◽  
Ride Quality ◽  
Linear Matrix ◽  
Railway Vehicle ◽  
Railway Vehicles ◽  
Effective Manner

In this paper, we apply model predictive control (MPC) based on mixed H2/H to active vibration control of the flexibility of railway vehicle to improve ride quality. However, the flexibility in the body of high-speed railway vehicles creates difficulties which in practice may result in the body structure being heavier than what it is supposed to be. The use of active suspension helps to model the vehicle and its flexibility in an effective manner. Conventional control approaches are compared with linear matrix inequality MPC technique using flexible-bodied railway vehicle as an example. The result indicates that the MPC technique performs better in improving ride comfort compared to the passive and classical techniques when flexible modes are present.

scholarly journals Mechanical models of sandfish locomotion reveal principles of high performance subsurface sand-swimming

2011 ◽  
Vol 8 (62) ◽  
pp. 1332-1345 ◽  
Author(s):  
Ryan D. Maladen ◽  
Yang Ding ◽  
Paul B. Umbanhowar ◽  
Adam Kamor ◽  
Daniel I. Goldman
Keyword(s):  
High Speed ◽  
High Performance ◽  
Granular Media ◽  
The Body ◽  
Physical Models ◽  
Particle Simulation ◽  
Sinusoidal Wave ◽  
Drag Forces ◽  
Single Period ◽  
Discrete Particle Simulation

We integrate biological experiment, empirical theory, numerical simulation and a physical model to reveal principles of undulatory locomotion in granular media. High-speed X-ray imaging of the sandfish lizard, Scincus scincus , in 3 mm glass particles shows that it swims within the medium without using its limbs by propagating a single-period travelling sinusoidal wave down its body, resulting in a wave efficiency, η , the ratio of its average forward speed to the wave speed, of approximately 0.5. A resistive force theory (RFT) that balances granular thrust and drag forces along the body predicts η close to the observed value. We test this prediction against two other more detailed modelling approaches: a numerical model of the sandfish coupled to a discrete particle simulation of the granular medium, and an undulatory robot that swims within granular media. Using these models and analytical solutions of the RFT, we vary the ratio of undulation amplitude to wavelength ( A / λ ) and demonstrate an optimal condition for sand-swimming, which for a given A results from the competition between η and λ . The RFT, in agreement with the simulated and physical models, predicts that for a single-period sinusoidal wave, maximal speed occurs for A / λ ≈ 0.2, the same kinematics used by the sandfish.

scholarly journals Multi-axial fatigue life assessment of high speed car body based on PDMR method

2018 ◽  
Vol 165 ◽  
pp. 17006
Author(s):  
Chaotao Liu ◽  
Pingbo Wu ◽  
Fansong Li
Keyword(s):  
Fatigue Life ◽  
Fatigue Test ◽  
High Speed ◽  
Test Bench ◽  
The Body ◽  
Life Assessment ◽  
Vehicle Body ◽  
Air Spring ◽  
Fatigue Life Assessment ◽  
Axial Fatigue

This article mainly introduces a method of converting the acceleration signal of body bolster obtained by the circuit test into the load of the air spring seat of vehicle body. This method mainly decomposes the body's movement posture into the form of ups and downs, roll and nod. Then formulate the test plan according to the performance of the body fatigue test bench. The vertical and horizontal displacements and longitudinal force are used as control commands.Taking advantage of vehicle body fatigue test bench to reproduce these basic types of vibration. Establish the transfer function of the acceleration of the bolster and the displacement excitation of the air spring, and then obtaining the load of the air spring seat. Finally, the multi-axial fatigue life assessment of the vehicle body was performed using the obtained load combined with the Moment of Load Path Method and the Path-Dependent Maximum Range Method.

scholarly journals Modeling and Analysis of an Air-Breathing Flexible Hypersonic Vehicle

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Xi-bin Zhang ◽  
Qun Zong
Keyword(s):  
Curve Fitting ◽  
High Speed ◽  
Hypersonic Vehicle ◽  
Vehicle Body ◽  
Flexible Structure ◽  
Viscous Effects ◽  
Aerodynamic Forces ◽  
Air Breathing ◽  
Modeling And Analysis ◽  
Vehicle Modeling

By using light-weighted material in hypersonic vehicle, the vehicle body can be easily deformed. The mutual couplings in aerodynamics, flexible structure, and propulsion system will bring great challenges for vehicle modeling. In this work, engineering estimated method is used to calculate the aerodynamic forces, moments, and flexible modes to get the physics-based model of an air-breathing flexible hypersonic vehicle. The model, which contains flexible effects and viscous effects, can capture the physical characteristics of high-speed flight. To overcome the analytical intractability of the model, a simplified control-oriented model of the hypersonic vehicle is presented with curve fitting approximations. The control-oriented model can not only reduce the complexity of the model, but also retain aero-flexible structure-propulsion interactions of the physics-based model and can be applied for nonlinear control.

Measurement and Analysis on Power Quality of Electric Railway Traction Substation Based on LabVIEW

2011 ◽  
Vol 383-390 ◽  
pp. 5034-5039
Author(s):  
Yang Yu Hu ◽  
Hong Jun Fu ◽  
Jun Yong Wu ◽  
Lu Yu Ji ◽  
Xi Lu Zhang
Keyword(s):  
Power Quality ◽  
Virtual Instrument ◽  
High Speed ◽  
Harmonic Distortion ◽  
Measuring System ◽  
National Standard ◽  
Three Phase ◽  
Railway Traction ◽  
Calculation Results ◽  
Electric Railway

A general power quality measuring system based on virtual instrument (LabVIEW) has been developed. For two electric railway traction transformers of Zhengzhou-Xi’an High Speed Passenger Dedicated Line, which access to Zhengzhou, Henan Grid, some important power quality parameters have been measured and analyzed. Then, the analysis results are compared with the calculation results by Power System Harmonic Penetration Software (PSHP), which is developed by our group. It shows that real measured data of Harmonic Ratio and Three-phase Unbalanced Factor of electric railway traction substations is comparable well with the calculation results. Furthermore, Three-phase Current Unbalanced Factor accorded well with the theoretical value of the V/v-connected traction transformer, and Total Voltage Harmonic Distortion and Unbalanced Factor meet the requirements of relative national standard.

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