THE IMPROVEMENT OF WHEEL TREAD REPROFILING PROCESS

2017 ◽  
pp. 120-128
Author(s):  
Igor Ivanov ◽  
Dmitriy Kononov ◽  
Sergey Urushev
Keyword(s):  
High Speed ◽  
Performance Enhancement ◽  
Practical Knowledge ◽  
Practical Importance ◽  
Rolling Stock ◽  
Speed Profile ◽  
Operating Life ◽  
Operational Life ◽  
High Speed Grinding ◽  
Process Solutions

Object: To show the lack of wheelset operating life efficiency use in case traditional methods of wheel tread reprofiling were used in the process of repair works. To consider the possibilities of further improvement of this process on the basis of new reprofiling technologies, using the deep and high-speed grinding. Methods: The methods of wheel tread reprofiling were analyzed, the effective process solutions, based on theoretical conclusions and current practical knowledge, were studied. Results: Wheel set wastage in case of using the traditional ways of reprofiling was estimated. Preliminary parameters of wheelset reprofiling modes using high-speed grinding were estimated, providing for the increase in wheel set operational life and reprofiling performance enhancement. Practical importance: The appropriateness of rolling stock wheel tread reprofiling, by using the method of infeed high-speed profile grinding, was presented. The obtained results may be applied in the development of requirements specification for wheel tread reprofiling machine at repair facilities of the Russian Railways.

The peculiarities of constructing bridges at high-speed mainline railroads

2017 ◽  
pp. 69-81
Author(s):  
Vladimir Smyrnov ◽  
Anastasia Dyayenko ◽  
Leonid Dyachenko
Keyword(s):  
High Speed ◽  
Structural Engineering ◽  
Practical Importance ◽  
Flow Diagram ◽  
Rolling Stock ◽  
High Speed Networks ◽  
Longitudinal Stiffness ◽  
Continuous Welded Rail ◽  
Train Operation ◽  
Calculation Results

Objective: To analyze calculation and construction peculiarities of bridgework at high-speed networks (VSM). Methods: Mathematical simulation, as well as numerical and analytical methods of structural engineering was applied. Results: The main peculiarities of bridge construction at high-speed networks (VSM) were analyzed in the given study. It was proved that artificial constructions at VSM operate in the conditions which differ considerably from the conditions at common railroad lines. The former include the need in continuous welded rail design along the whole length of a bridge, requirement for high stiffness of a structure; consideration of aerodynamic influence of a rolling stock, moving with high speed, on structures, consideration of “train-bridge” system’s elements interaction in order to identify resonant modes of train operation, which result in increased dynamic impact on a bridge, railway vehicles, etc. Calculation results of a “bridge- continuous welded rail” system interaction under temperature and train influence for specific types of bridgeworks multi-span beam discontinuous and continuous elevated structures were presented in the article. The influence of length, flow diagram and longitudinal stiffness of intermediate structures on force value, occurring in the rails of a rolling stock was stated. Practical importance: The description of some peculiarities of train operation at VSM bridges, which are to be considered during design engineering, were presented as well as certain measures, providing operation security and comfort of train passengers, were suggested.

Development and Experimental Investigation of a High Speed Grinding Spindle Equipped with Fully-Ceramic Bearings and Ceramic Shaft

2010 ◽  
Vol 156-157 ◽  
pp. 1366-1371 ◽  
Author(s):  
Song Hua Li ◽  
Yu Hou Wu ◽  
Li Xiu Zhang
Keyword(s):  
High Speed ◽  
High Efficiency ◽  
Damping Ratio ◽  
Tetragonal Zirconia ◽  
Rotational Inertia ◽  
Motorized Spindle ◽  
Operating Life ◽  
Conventional Steel ◽  
Spindle Shaft ◽  
High Speed Grinding

Trend of the high-speed and high efficiency machining has pushed the continuous demand of higher spindle speed and power for the machining center application. However, Conventional steel spindles are not appropriate for high speed operation because of their high rotational inertia and low damping ratio. Moreover, heat generation and dynamic loading caused by high speed rotation have been obstacles for increasing the speed limit in many conventional steel spindles applications. Apart from optimizing lubrication, the application of new materials is an interesting alternative to increase the boundary speed and life-span of roller bearings for machine-tool spindles. In this study, a high speed grinding motorized spindle equipped with hot isostatically pressed silicon nitride (HIPSN) fully-ceramic ball bearings without inner rings and yttria partially stabilized tetragonal zirconia polycrystal (Y-TZP) ceramic spindle shaft was designed for higher speed, rigidity, precision and longer operating life. Furthermore, the characteristics of ceramic motorized spindle, such as temperature increase, vibration, power, rigidity, noise and so on, were investigated by the experimentation. The results show that the ceramic motorized spindles have good behaviors under low load, high speed grinding conditions.

Equivalent conicity and its influence on rolling-stock operation

2017 ◽  
pp. 247-255
Author(s):  
Artem Kyselev ◽  
Lyudmila Blazhko ◽  
Andrey Romanov
Keyword(s):  
High Speed ◽  
Practical Importance ◽  
Railway Track ◽  
Rolling Stock ◽  
Functional Dependencies ◽  
Wheel Pair ◽  
Wheel Rolling ◽  
High Speed Trains ◽  
Force Reduction ◽  
Equivalent Conicity

Objective: To identify the rolling-stock stability, force reduction, emerging in the process of wheel-rail interaction, the reduction of wheel thread and wheel flange wear, horizontal wear during high-speed running. To consider issues of wheel-rail interaction, that is the influence of a wheel pair equivalent conicity on rolling stock operation. Lateral motion of a wheel pair about an axis of a track in accordance with conicity parameters occurs in the process of standard tapered wheel-rail interaction. Methods: Calculation methods of equivalent conicity and basic assumptions in design diagram were presented. The main functional dependencies of equivalent conicity were determined. “All-purpose mechanism” bundled software, developed on the basis of FastSim algorithm introduced by G. Kalker, was applied for modeling of wheel pair operation on a railway track. Results: Interaction of VNIIZhT-RM-70 wheel for “Sapsan” high-speed trains with R65 rail type was studied, as well as UIC60 rail type used on European railroads. Wheel rolling occurs in different circumferential directions in case of lateral movement of a wheel pair Oscillating motion was described, as well as the parameters on the basis of which equivalent conicity is formed. Practical importance: The necessity in reduction of equivalent conicity to efficiency parameters of high-speed running realization on Russian railroads was revealed by means of modeling.

Influence of track irregularities on the vertical acceleration of cars during high-speed traffic

2021 ◽  
Vol 18 (3) ◽  
pp. 335-339
Author(s):  
Vladimir N. SMIRNOV ◽  
◽  
Andrey V. LANG ◽  
Nikita A. LABUTIN ◽  
◽  
...  
Keyword(s):  
Differential Equations ◽  
High Speed ◽  
Practical Importance ◽  
Rolling Stock ◽  
Vertical Acceleration ◽  
Bridge Structures ◽  
Optimal Dynamic ◽  
Rolling Load ◽  
Train System ◽  
Track Irregularities

Objective: Obtaining differential equations of the “bridge-train” system, the solution of which allows one to identify the optimal dynamic parameters of the vehicle of high-speed rolling stock and bridge structures when rolling load moves at high speed. Methods: Derivation of differential equations of the “bridge– train” system by the analytical method. Results: Obtaining formulas for determining the acceleration of the spring borne part of rolling stock vehicles depending on track irregularities. Practical importance: Based on the results of calculations according to these formulas, a reasonable assignment of the values of camber and the possibility of assessing the effect of random irregularities of the rail track on the bridge are provided.

Demonstration of Advanced Magnetic Technologies for a Highly Reliable and Retrievable Electric Submersible Pump Topology

2021 ◽  
Author(s):  
Patrick McMullen ◽  
David Biddick
Keyword(s):  
High Speed ◽  
Magnetic Bearing ◽  
Free Fluid ◽  
Submersible Pump ◽  
Rotor Vibration ◽  
Operating Life ◽  
Element Analysis ◽  
Operational Life ◽  
Electric Submersible Pump ◽  
Bearing System

Abstract This effort designs, builds and tests key enabling technology components of the magnetic drive system (MDS) electric submersible pump (ESP) concept, an advanced high speed ESP that differs from conventional ESP topologies in using magnetic technologies to increase reliability and retrievability. The enabling components include a radial passive magnetic bearing (PMB) system, allowing for a contact-less bearing system and remote removal of rotating components, and magnetic vibration sensors (MVS), enabling prognostics for higher reliability. An MDS ESP preliminary design has been developed through a DeepStar program, from which the size and integration requirements of the PMB and MVS have been defined. These requirements guide the analysis, design and testing of the full-scale components. Empirical analysis tools are used for initial iterations in size and performance of the PMB and MVS, followed by detailed magnetic finite element analysis (FEA) using commercial validated tools for the final performance prediction. With analytical validation of performance, detail designs are developed and hardware fabricated. Hardware testing is done to validate performance predictions and alignment with system requirements. The PMB performance results include testing of stiffness capability. These characteristics are used to validate the integration requirements for load capability and deflection during static load events, all in relation to validating performance for use in the MDS system. This test data is used to validate the analysis approach used as well as to finalize the integration size of the PMB to meet the performance requirements of the MDS system. To identify rotor operating speed and rotor vibration magnitude and frequencies, the MVS is tested for sensing rotor motion rate and frequency, including sub-synchronous and super synchronous frequencies. Identifying data reduction needs, i.e. how data is compiled and presented to focus on specific areas of interest, is also critical to determine the vibration characteristic of specific events happening in the ESP, such as bearing wear or dynamic fluid changes. Testing also includes variations in tubing materials to assess performance impact. These technologies offer bearing and sensor technologies that enhance ESP reliability and active performance monitoring. The PMBs offer a contact-less bearing system that does not require lubrication, can operate with large clearances to allow free fluid flow, and has no operating life limits. The compact MVS offers rotor vibration diagnostics throughout the ESP, including between pump stages, for monitoring performance, detecting ESP mechanical issues or process fluid variations allowing immediately response to increase operational life.

scholarly journals The effect of air flow on an aerodynamic device for a pantograph

2021 ◽  
Vol 2021 (4) ◽  
pp. 453-459
Author(s):  
A. A. Vorob’ev ◽  
◽  
Ya. S. Vatulin ◽  
D. D. Karimov ◽  
◽  
...  
Keyword(s):  
Energy Consumption ◽  
High Speed ◽  
Practical Importance ◽  
Aerodynamic Resistance ◽  
Rolling Stock ◽  
Current Collectors ◽  
Current Collection ◽  
Electric Rolling Stock ◽  
Air Resistance ◽  
High Speed Trains

Objective: To evaluate the infl uence of the parameters of current collectors of high-speed and very high-speed trains on the value of aerodynamic resistance. To study the effect of airfl ow on a pantograph aerodynamic device using SolidWorks software. Methods: A comparison of the obtained values of aerodynamic air resistance with those that were produced earlier is carried out. Results: By means of aerodynamic device, it is possible to reduce the speed of the air fl ow effecting the pantograph, to reduce the values of aerodynamic resistance and energy consumption, to extend the service life of current collectors. Practical importance: The proposed design can improve the current collection, which will reduce the load on the overhead line and the pantograph slide, and reduce the energy consumption of electric rolling stock.

scholarly journals Droplet impact onto a spring-supported plate: analysis and simulations

2021 ◽  
Vol 128 (1) ◽  
Author(s):  
Michael J. Negus ◽  
Matthew R. Moore ◽  
James M. Oliver ◽  
Radu Cimpeanu
Keyword(s):  
High Speed ◽  
Flexible Substrate ◽  
Practical Importance ◽  
Hybrid Approach ◽  
Hydrodynamic Pressure ◽  
Analytical Framework ◽  
Canonical System ◽  
Linear Process ◽  
Plate Motion ◽  
The Impact

AbstractThe high-speed impact of a droplet onto a flexible substrate is a highly non-linear process of practical importance, which poses formidable modelling challenges in the context of fluid–structure interaction. We present two approaches aimed at investigating the canonical system of a droplet impacting onto a rigid plate supported by a spring and a dashpot: matched asymptotic expansions and direct numerical simulation (DNS). In the former, we derive a generalisation of inviscid Wagner theory to approximate the flow behaviour during the early stages of the impact. In the latter, we perform detailed DNS designed to validate the analytical framework, as well as provide insight into later times beyond the reach of the proposed analytical model. Drawing from both methods, we observe the strong influence that the mass of the plate, resistance of the dashpot, and stiffness of the spring have on the motion of the solid, which undergo forced damped oscillations. Furthermore, we examine how the plate motion affects the dynamics of the droplet, predominantly through altering its internal hydrodynamic pressure distribution. We build on the interplay between these techniques, demonstrating that a hybrid approach leads to improved model and computational development, as well as result interpretation, across multiple length and time scales.

Simulation and Experiment on the Residual Stress in Super-High Speed Grinding

2010 ◽  
Vol 135 ◽  
pp. 238-242
Author(s):  
Yue Ming Liu ◽  
Ya Dong Gong ◽  
Wei Ding ◽  
Ting Chao Han
Keyword(s):  
Residual Stress ◽  
High Speed ◽  
Element Model ◽  
Residual Stress Distribution ◽  
X Ray Diffraction ◽  
Machined Surface ◽  
X Ray ◽  
High Speed Grinding ◽  
Simulation And Experiment ◽  
Cylindrical Workpiece

In this paper, effective finite element model have been developed to simulation the plastic deformation cutting in the process for a single particle via the software of ABAQUS, observing the residual stress distribution in the machined surface, the experiment of grinding cylindrical workpiece has been brought in the test of super-high speed grinding, researching the residual stress under the machined surface by the method of X-ray diffraction, which can explore the different stresses from different super-high speed in actual, and help to analyze the means of reducing the residual stresses in theory.

Durability Analysis of the Reduction Gear for High Speed Train Considering Driving Histories

2012 ◽  
Vol 586 ◽  
pp. 269-273
Author(s):  
Chul Su Kim ◽  
Gil Hyun Kang
Keyword(s):  
Fatigue Life ◽  
High Speed ◽  
Element Model ◽  
Rolling Stock ◽  
Reduction Gear ◽  
High Speed Train ◽  
Analysis Software ◽  
Tractive Effort ◽  
Durability Analysis ◽  
The Finite Element Model

To assure the safety of the power bogies for train, it is important to perform the durability analysis of reduction gear considering a variation of velocity and traction motor capability. In this study, two types of applied load histories were constructed from driving histories considering the tractive effort and the train running curves by using dynamic analysis software (MSC.ADAMS). Moreover, this study was performed by evaluating fatigue damage of the reduction gears for rolling stock using durability analysis software (MSC.FATIGUE). The finite element model for evaluating the carburizing effect on the gear surface was used for predicting the fatigue life of the gears. The results showed that the fatigue life of the reduction gear would decrease with an increasing numbers of stops at station.

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