scholarly journals ANALYSIS OF TENDENCIES TOWARDS CHANGES IN TEMPERATURES OF RAILWAY VEHICLE AXLE BOXES / RIEDMENŲ AŠIDĖŽIŲ KAITIMO TEMPERATŪRŲ KITIMO TENDENCIJŲ ANALIZĖ

2012 ◽  
Vol 4 (4) ◽  
pp. 361-365
Author(s):  
Olegas Lunys ◽  
Rimantas Subačius
Keyword(s):  
Automatic Control ◽  
Critical State ◽  
Scientific Literature ◽  
Rolling Stock ◽  
Railway Vehicle ◽  
Control Devices

The paper analyzes variations in the temperature of axle-box heating of railroad rolling stock considering two modes of the train - driving and parking position. Additionally, the article describes the influence of the axle load and season on the heat of the axle-box, forecasts intolerable residual resources and explains a possibility of detecting likely breakage at the very beginning of defects. The paper also deals with scientific literature related to axle-box heating and focuses on the conducted practical and theoretical experiments. The carried out research has established the rates of operating heating and critical heating. The application of numerical values for the algorithm of automatic control devices could help with detecting the breakdowns of the axle-box before they reach a critical state and assist in forecasting residual operating resources. Santrauka Nagrinėjama geležinkelio riedmenų ašidėžių kaitimo kitimas traukinio važiavimo ir stovėjimo metu, riedmenų krovumo ir metų laiko įtaka ašidėžei kaisti, neleistinai kaistančios ašidėžės liekamojo resurso prognozė, ašidėžės gedimo nustatymo galimybė pačioje gedimo atsiradimo pradžioje. Išanalizuota mokslinė literatūra, susijusi su riedmenų ašidėžių kaitimu, taip pat išanalizuoti atlikti eksperimentiniai ir teoriniai darbai. Tyrimo metu nustatytos ašidėžių darbinės ir kritinės riedmenų ašidėžių kaitimo temperatūros. Šių temperatūrų skaitines reikšmes pritaikius riedmenų automatinės kontrolės prietaisų algoritmui būtų galima aptikti ašidėžių gedimus, kol jie nepasiekė kritinės būklės, ir prognozuoti liekamąjį darbo resursą.

KRR electrochemical mercury cell for monitoring and measuring instruments and automatic control devices

1974 ◽  
Vol 17 (5) ◽  
pp. 717-719
Author(s):  
N. S. Lidorenko ◽  
A. V. Dokukin ◽  
G. Ya. Voronkov ◽  
E. M. Shmar'yan ◽  
I. A. Zaidenman ◽  
...  
Keyword(s):  
Automatic Control ◽  
Measuring Instruments ◽  
Mercury Cell ◽  
Control Devices

Development of an Unmanned Combat Vehicle with its Training System

2015 ◽  
Vol 764-765 ◽  
pp. 768-772
Author(s):  
Shih Sung Lin ◽  
Yu Wei Liu
Keyword(s):  
Image Processing ◽  
Automatic Control ◽  
Training System ◽  
Unmanned Ground Vehicle ◽  
Ground Vehicle ◽  
Combat Vehicle ◽  
Control Devices ◽  
Control Technologies ◽  
Set Up ◽  
Study Designs

By using image processing and automatic control technologies, this study designs an unmanned ground vehicle (UGV) that can be operated by various control devices, such as laptops and joysticks. A camera is set up on the UGV to capture the sight around it, and then can send the video to the back end system in a wireless manner. Besides, we design an attacking system that allows users to do the zeroing correction for shooting the target precisely. Moreover, a shooting training system is designed to improve the convenience for target practice. It not only can send the result to the back end system immediately but also can simulate the enemy movement to make the training more reality.

Efficiency of automatic control devices

1959 ◽  
Vol 2 (7) ◽  
pp. 495-496
Author(s):  
A. V. Vysotskii
Keyword(s):  
Automatic Control ◽  
Control Devices

scholarly journals Improvement of control devices for road sections of railway automation and telemechanics

2021 ◽  
Vol 264 ◽  
pp. 05031
Author(s):  
Aziz Saitov ◽  
Janibek Kurbanov ◽  
Zohid Toshboyev ◽  
Sunnatillo Boltayev
Keyword(s):  
Control Unit ◽  
Technical Condition ◽  
Rolling Stock ◽  
Scientific Article ◽  
Self Monitoring ◽  
Uninterruptible Power Supplies ◽  
Functional Control ◽  
Control Devices ◽  
Uninterruptible Power ◽  
And Control

In this scientific article, control sensors and control devices have been improved based on the method of counting arrows of the rolling stock of railway transport. The microprocessor-controlled control unit and control system have been simplified to manage traffic between two stations, and a self-monitoring, reliable and risky scheme has been developed. Wiring diagrams of existing transport relays have been updated for uninterruptible power supplies, microprocessor devices, and sensors. An automated schematic diagram with a microprocessor for signaling a collision of a railway with wagons has been created, and the order in which the speed of train movement approaches the crossing has been maintained. The complex functional control of rolling stock was improved based on the method of counting bullets, electronic archiving of the movement of orders of the train attendant and dispatcher, as well as the operation of devices for monitoring the technical condition of the station.

scholarly journals Improving the Methodology of Placing Peripheral Devices for Monitoring the Technical Condition of Rolling Stock

2021 ◽  
pp. 25-36
Author(s):  
V. V. Burchenkov
Keyword(s):  
Traffic Safety ◽  
Block Diagram ◽  
Research Work ◽  
Technical Condition ◽  
Rolling Stock ◽  
Functional Block Diagram ◽  
Process Step ◽  
Technical Control ◽  
Control Devices

Purpose. Based on the research work of units and parts of rolling stock undercarriage in transient modes of emergency situations it is proposed to optimize the sequential placing of peripheral contactless devices for technical control of locomotives and cars on railway lines. Methodology. Investigation of transient processes of temperature increase of faulty axle bearings of locomotives and cars during remote technical diagnosing allows one to organize theory and hardware construction of the peripheral systems for testing the rolling stock on the move. Automatic control of the technical state of the rolling stock on the move – the last and in some cases the only possible process step, which allows revealing unacceptable defects in rolling units and thereby prevent emergencies in railway transport. Findings. Based on the research it was proposed a solution to the optimization problem of placing peripheral control devices of rolling stock when moving according to the criteria of the linear and exponential nature of heating defective axle boxes of wheelsets and other units of undercarriage. The risks of train stop on the railway line because of the erroneous classification of normally heated axle boxes as overheated, as well as the consequences of classification of overheated axle box as normally heated axle boxes were evaluated. Originality. Optimization model of placing peripheral control devices based on probabilistic criteria for evaluating the degree of permissible risk that, at a minimum, should not be exceeded during the transition to control technical means. A functional block diagram of test hardware diagnostics for the wheelsets when determining the gradations of digital indicators of defects was proposed. Practical value. The value of the results obtained lies in the improvement of a method of placing technical control peripheral devices and diagnosing rolling stock when determining the distance between the control stations in the same direction and organizing tracking modes for railcars with developing defects. From a technical point, reduced error probability is directly related to traffic safety and diagnostic algorithms.

Development and validation of a methodology for closed loop simulations of the driveline in railway vehicles

2017 ◽  
Vol 232 (6) ◽  
pp. 1625-1649
Author(s):  
Naim Kuka ◽  
Caterina Ariaudo ◽  
Riccardo Verardi ◽  
Andrea Dolcini
Keyword(s):  
Closed Loop ◽  
Mechanical Systems ◽  
Simulation Models ◽  
Ease Of Use ◽  
Rolling Stock ◽  
Railway Vehicle ◽  
Development Phases ◽  
Definition Of ◽  
Stock Solutions ◽  
Development And Validation

The optimisation of the dynamic behaviour of an electric railway vehicle cannot disregard the effects of the driveline in the traction and braking phases when the electrical and mechanical systems mutually exchange excitations and loads. To this end, complex and reliable models for the simulation of the whole chain, from the power collector to the wheel–rail contact including control algorithms, are necessary. Using detailed and validated standalone models of the electrical and mechanical systems, developed in Simulink and in SIMPACK, respectively, the authors have studied, tuned and validated a closed loop simulation methodology. While the standalone simulation models for different rolling stock solutions have been dealt in other papers and conferences, in this paper, the readers will find a description of the steps necessary to obtain realistic co-simulations based on Simulink and SIMPACK models operating in a closed loop and the definition of an opportune interface that guarantees modularity and ease of use. The paper analyses a synthesis of Alstom's experiences on driveline modelling followed by an overview of the new methodology and the of main development phases at the vehicle system or the sub-systems level. The model validation process, the results obtained and the range of applications of the methodology are also discussed.

Modeling of Railway Vehicles for Virtual Homologation from Dynamic Behavior Perspective

2013 ◽  
Vol 371 ◽  
pp. 647-651 ◽  
Author(s):  
Mădălina Dumitriu
Keyword(s):  
Dynamic Behavior ◽  
Equations Of Motion ◽  
Continuous Model ◽  
Point Of View ◽  
Rolling Stock ◽  
Railway Vehicle ◽  
Analysis Method ◽  
Passenger Car ◽  
Railway Vehicles ◽  
Comfort Index

Modeling and simulation in railway vehicle dynamics is a useful tool in the design of rolling stock when choosing the best solutions for vehicle and infrastructure components in assessing possible risks and, more recently, in the certification of railway vehicles from the point of view of dynamic behavior based on virtual approval. This paper presents the discrete-continuous model of two-level suspension passenger car running along a tangent track with random vertical irregularity as the theoretical tool to asses the parameters of the approval criteria: the running behavior and comfort. The equations of motion are solved in frequency-domain using the modal analysis method and then the carbody acceleration and the comfort index are calculated. The results derived from a numerical simulation performed for the virtual homologation of a particular passenger car are presented, and so is the possibility to improve the design of the vehicle suspension, in compliance with the approval criteria.

scholarly journals Analysis of the Gyroscopic Stability of the Wheelset

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Hao Dong ◽  
Jing Zeng ◽  
Liang Wu ◽  
Huanyun Dai
Keyword(s):  
Asymptotic Stability ◽  
High Speed ◽  
Critical Value ◽  
Rolling Stock ◽  
Instability Criterion ◽  
Necessary Condition ◽  
Railway Vehicle ◽  
Gyroscopic Effect ◽  
Key Factor ◽  
Inequality Theorem

The wheelset of the railway vehicle is a rotor which itself has gyroscopic effect. Nowadays, the rolling stock has entered the era of high speed, and the wheel rotates faster than in the past. The influence of gyroscopic effect on stability is little understood. Metelitsyn’s inequality theorem for asymptotic stability has some advantages to analyze this problem although this method is sufficient but not necessary condition. Based on its deduction, the extremal eigenvalues criterion and compared with Routh-Hurwitz criterion, both are applied to solve the critical value of speed. Further, according to the instability criterion, gyroscopic contributory ratio is derived to study how the role the gyroscopic effect plays in stability. Moreover, the effect of gyroscopic matrix or gyroscopic terms pitch rotor inertia Iy on stability coefficient is investigated. The results show that Iy is a key factor to wheelset gyroscopic stability. The gyroscopic effect becomes significant, and the stability increases with increasing Iy. The results also indicate that the critical value of speed solved by Metelitsyn theorem is more conservative than the one it solved by Hurwitz criterion, which proves that Metelitsyn inequality theorem for asymptotic stability is a sufficient but not necessary condition in the way of attaining the numerical simulation result. Finally, the test for the influence of gyroscopic effect on stability needs to be further studied.

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