scholarly journals Application of the train congestion recovery method for constructing an instantaneous direct current railway section

2021 ◽  
Vol 2131 (4) ◽  
pp. 042074
Author(s):  
V A Osipov ◽  
P A Logunova
Keyword(s):  
Analytical Calculation ◽  
Electricity Consumption ◽  
Rolling Stock ◽  
Energy Losses ◽  
Recovery Method ◽  
Successful Solution ◽  
Direct Measurements ◽  
Study Results ◽  
Electric Traction ◽  
Electrified Railways

Abstract Improving the energy efficiency of the transportation process is one of the key tasks, the solution of which is one of the priority areas of the holding JSC «RZD» research. The successful solution of this problem depends, among other things, on the effectiveness of measures taken to reduce energy losses arising from electricity transmission to the consumer, which is the rolling stock of electrified railways. To develop a set of organizational and technical measures aimed at minimizing electricity consumption, an effective apparatus that provides determination of energy losses amount of in the electric-traction netware in real time is needed. The article proposes a method for hardware-analytical calculation of energy losses, which is based on an algorithm for processing the results of direct measurements. It is proposed to calculate power losses using laws and relationships known from the course of electrical engineering. A distinctive feature of the proposed method is the function of recreating the instantaneous circuit based on the data of currents and voltages measurements at the control points of a given section. The proposed method is suitable for use exclusively on DC electrified railways. Also, the paper presents the methods for determining energy losses used today in Russia, and gives their brief characteristics. The logical and mathematical apparatus of the method is described in detail, indicating the possible reasons that, in the process of synthesizing instantaneous circuits, can affect the occurrence of errors. An assessment of the study results of this method application in the electric-traction netware of railways is given.

Improving the Efficiency of High-Speed AC Contact Suspension

2021 ◽  
Vol 5 (5) ◽  
pp. 39-43
Author(s):  
Maksim V. SHEVLYUGIN ◽  
◽  
Daria V. SEMENOVA ◽  
Keyword(s):  
Power Supply ◽  
High Speed ◽  
Single Phase ◽  
New Technologies ◽  
Alternating Current ◽  
Rolling Stock ◽  
New Materials ◽  
High Speed Railway ◽  
Electric Rolling Stock ◽  
Electrified Railways

When developing a high-speed contact suspension for railways electrified with alternating current, it is important to ensure that the electric rolling stock passes the neutral insert without turning off the current and without reducing the speed of movement. The article provides an analysis of previously developed devices in the field of power supply of electrified railways of single-phase alternating current, in which an attempt was made to pass an electric rolling stock of a neutral insert without disconnecting the load. The device of isolating coupling of a catenary and a neutral insert for high-speed railway lines electrified on alternating current is described. In this case, the passage of the neutral insert is carried out under current and braking of the electric rolling stock will not occur. Among other things, to improve the efficiency of high-speed contact suspension for railways electrified with alternating current, it is proposed to use new materials and new technologies that can be used in the device of insulating coupling of the catenary

scholarly journals Shear Stress, Energy Losses, and Costs: A Resolved Dilemma of Pulsatile Cardiac Assist Devices

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Sayed Nour ◽  
Jia Liu ◽  
Gang Dai ◽  
Daniel Carbognani ◽  
Daya Yang ◽  
...  
Keyword(s):  
Shear Stress ◽  
Lower Energy ◽  
Left Ventricular ◽  
Energy Losses ◽  
Assist Devices ◽  
Cardiac Assist ◽  
Cardiac Assist Devices ◽  
Study Results ◽  
Pulsatile Perfusion ◽  
Perfusion Mode

Cardiac assist devices (CAD) cause endothelial dysfunction with considerable morbidity. Employment of pulsatile CAD remains controversial due to inadequate perfusion curves and costs. Alternatively, we are proposing a new concept of pulsatile CAD based on a fundamental revision of the entire circulatory system in correspondence with the physiopathology and law of physics. It concerns a double lumen disposable tube device that could be adapted to conventional cardiopulmonary bypass (CPB) and/or CAD, for inducing a homogenous, downstream pulsatile perfusion mode with lower energy losses. In this study, the device’s prototypes were tested in a simulated conventional pediatric CPB circuit for energy losses and as a left ventricular assist device (LVAD) in ischemic piglets model for endothelial shear stress (ESS) evaluations. In conclusion and according to the study results the pulsatile tube was successfully capable of transforming a conventional CPB and/or CAD steady flow into a pulsatile perfusion mode, with nearly physiologic pulse pressure and lower energy losses. This represents a cost-effective promising method with low mortality and morbidity, especially in fragile cardiac patients.

scholarly journals Improvement of the regenerating energy accounting system on the direct current railways

2015 ◽  
Vol 36 (4) ◽  
pp. 35-42 ◽  
Author(s):  
Valeriy G. Kuznetsov ◽  
Oleg I. Sablin ◽  
Alenka V. Chornaya
Keyword(s):  
Power Supply ◽  
Practical Importance ◽  
Rolling Stock ◽  
Accounting System ◽  
Quantitative Indices ◽  
Energy Accounting ◽  
Traction Power Supply ◽  
Electric Traction ◽  
Regenerative Energy ◽  
Traction Power

Purpose. Monitoring of current state of quantitative indices of regenerative energy in the suburban movement, the analysis of the factors influencing its volumes and improvement the principles of the train regenerative energy accounting on the basis of it. Relevance. Development of effective measures of increase the regeneration efficiency of the electric power in system of electric traction demands comprehensive completeness of information on quantitative indices of regeneration energy volumes at all possible levels of its analysis, in particular on the corresponding sections of RS movement that will allow to establish the influence on the level of regeneration of various factors, such as parameters of traction power supply and the organization of train service. As the existing system of the regenerative energy accounting does not allow to consider the specified factors, development of the principles for increasing the efficiency of the analysis of volumes of return energy to a contact line during regenerative braking on DC rolling stock is the actual direction of researches. Collective monitoring of regeneration energy volumes by specialists of locomotive service, power supply and traffic operating departments will be essentially new approach to definition of real factors and taking effective decisions for increasing of using of regenerative energy. Scientific novelty. It’s offered to consider the influence on quantitative indices of regenerative energy the parameters of traction power supply and the organization (sizes) of traffic service on sections. Practical importance. Increasing the efficiency of the regeneration energy accounting is an important element in drawing up the balance of energy for electric traction system, development of the effective methods for improvement of the conditions of regeneration in it and in estimation of its power indicators in general.

scholarly journals Analysis of the electric energy consumption components for mine train traction

2019 ◽  
Vol 294 ◽  
pp. 01001 ◽  
Author(s):  
Serhii Arpul ◽  
Viktor Artemchuk ◽  
Mykola Babyak ◽  
Viacheslav Vasilyev ◽  
Hennadii Hetman ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Energy Intensity ◽  
Electric Energy ◽  
Rolling Stock ◽  
List Type ◽  
Opencast Mining ◽  
Study Results ◽  
Transportation Process ◽  
The Cost

The paper considers the issues of reducing the energy intensity of transportation at opencast mining enterprises, the relevance of which has now increased due to the rise in the cost of fuel and energy resources. It presents the study results concerning the cost structure of the electricity consumed by electric mine transport, which form the basis for the development of technical and operational measures to reduce the energy intensity of the transportation process. It is shown that the work to reduce the electricity consumption for mined rock transportation should be aimed at: Reduction of losses in the power circuits of the traction rolling stock due to the use of more advanced electric rolling stock and regulation of the degree of utilization of the installed traction power; Introduction of new contact materials for electrical circuits with the lowest possible resistivity, including for current collector plates; Introduction of measures to reduce energy consumption for power supply of auxiliary circuits; Development and implementation of rational train control techniques. The introduction of energy-saving measures should include the development and application of effective methods for calculating individual norms of energy consumption and incentives for energy saving of the employees involved in the organization of the transportation process.

scholarly journals A Grey-BPNN Model for Evaluating the Competitiveness of Chinese Contractors in the High-Speed Rail Market in Europe

2019 ◽  
Vol 2019 ◽  
pp. 1-19
Author(s):  
Yi-Hsin Lin ◽  
Biling Shi ◽  
Po-Han Chen ◽  
Zhao Xu ◽  
Huimin Liu
Keyword(s):  
High Speed ◽  
Rolling Stock ◽  
High Speed Rail ◽  
The Sustainable Development ◽  
Advantages And Disadvantages ◽  
Management Ability ◽  
Study Results ◽  
Grey Relational ◽  
Technology Level ◽  
Bpnn Model

With the planning and progress of the construction of the trans-Eurasian high-speed rail (HSR) network, it becomes an important issue for Chinese contractors to enter the European HSR market. Facing the world’s most competitive contractors and their high technology levels, Chinese contractors will need to know their advantages and disadvantages, so as to make necessary improvements. In this study, contractors for HSR are divided into two groups: construction contractors and rail equipment suppliers. In order to evaluate the competitiveness of HSR contractors, a Grey-BPNN model that combines the grey relational analysis and backpropagation neural network (BPNN) is proposed. The Grey-BPNN model is expected to analyze the overall competitiveness of Chinese contractors in the European HSR market and provide informative decision support for them. The study results show the following: (1) in the field of HSR construction, the competitiveness gap between the top-tier Chinese contractors and the most competitive international contractors is small. Chinese contractors’ competitive advantages lie in medium- and low-technology-level projects, with a strong development potential. However, they highly depend on Chinese domestic market and lack in intangible resources, like management ability and market development ability; (2) for rail equipment suppliers, China Railway Rolling Stock Corporation (CRRC) ranks among the top-tier leaders of the international market. CRRC’s greatest competitor in the European HSR market is Siemens, and CRRC is much more competitive than others in the sustainable development capability. However, CRRC needs to increase the quantity of patents and Research and Development (R&D) expenditures in transportation. As a weak transportation patent holder, CRRC has a potential risk of getting intellectual property litigations in the European HSR market.

scholarly journals The use of correlation and regression analysis for assessment of the energy effectiveness of the dc electric locomotives auxiliary equipment

2018 ◽  
Vol 239 ◽  
pp. 01038 ◽  
Author(s):  
Stanislav Istomin
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Electricity Consumption ◽  
Technical Condition ◽  
Rolling Stock ◽  
Multiple Regression Equation ◽  
Electric Locomotive ◽  
Distribution Law ◽  
Auxiliary Equipment ◽  
Environment Temperature

Through additional processing of the modern movement parameter recorders data of the DC electric locomotive 2ES6 the article first presents the results of the actual consumption of electricity for own needs and the proportion of these costs from the consumption of trains traction is determined, which in terms of operational depot is difficult to implement. The estimation of influencing factors on the energy consumption for own needs of 2ES6 series electric locomotives is made. As a result it was found that the internal energy consumption is influenced by such factors as rolling stock mass, axle load and environment temperature. Statistic models were made to normalize internal electricity consumption and their quality estimation was fulfilled. It is found that the remainders of the multiple regression equation, which take the above factors into account, obey the normal distribution law, indicating the adequacy of their further use to assess the energy efficiency of the 2ES6 series DC electric locomotives auxiliary equipment. The use of regression models will allow to identify electric locomotives with auxiliary equipment with low energy efficiency and to send them to unscheduled repairs in time to restore the required technical condition.

POINTWORK SERVICE LIFE EXTENSION BY MEANS OF UNEVEN STIFFNESS OF TURNOUT CURVE RAILS LINE

2017 ◽  
pp. 7-14
Author(s):  
Ludmila Blazhko ◽  
Vladislav Zakharov ◽  
Yevgeniy Chernyayev ◽  
Yevgeniy Shekhtman
Keyword(s):  
Service Life ◽  
Computational Methods ◽  
Practical Importance ◽  
Side Impact ◽  
Life Extension ◽  
Rolling Stock ◽  
Study Results ◽  
Service Life Extension ◽  
Train Speed ◽  
Side Track

Objective: To reduce side wear of rail elements of side track backing-up rail. Methods: Comparative and computational methods were applied in the study. Results: It was detected that in order to extend the pointwork turnout curve service life, it is necessary to reduce the side impact on an outer rail by using rail pads of diverse elasticity. Practical importance: Application of rail pads of diverse elasticity under the outer and inner rails of a pointwork turnout curve makes it possible to increase the speed of rolling stock movement on the side direction of pointwork and increase the life of a pointwork turnout curve with fixed train speed.

Multi-parameter predictive shift schedule of automatic mechanical transmission for electric bus

2021 ◽  
pp. 095440702110506
Author(s):  
Jiankun Peng ◽  
Hailong Zhang ◽  
Haonan Li ◽  
Yuanguang Jiang ◽  
Zhanjiang Li
Keyword(s):  
Electricity Consumption ◽  
Mechanical Transmission ◽  
Multiple Parameters ◽  
Shift Schedule ◽  
Electric Bus ◽  
Study Results ◽  
Artificial Neural Network Ann ◽  
Short Horizon ◽  
Relationship Of ◽  
Road Slope

Shift schedule is crucial in improving the dynamic and economic performance of electric vehicles (EVs) equipped with automatic mechanical transmission (AMT). As the driver, vehicle, and road constitute a closed-loop inseparable system, identifying the states of both vehicle and road is fundamental to realizing optimal shift schedule. However, the existing shift strategies neglect the coupling relationship of multiple parameters to the shift strategy. To minimize this gap, this paper presents a novel multi-parameter shift schedule based on model predictive control. Firstly, cubature Kalman filters (CKF) algorithm is employed to accurately estimate vehicle quality and road slope, which could improve the energy economy of EVs. Secondly, an artificial neural network (ANN) is adopted to forecast the compound future short horizon driving conditions, which contains the perdition information of vehicle velocity and road slope. Meanwhile, the AMT predictive shift schedule based on the above estimated and forecast information is constructed, which used dynamic programming to optimize in the rolling horizon. Simulation study results indicate that the ANN-based predictive approach shows better performance on accuracy and robustness than that of Markov chain, and the electricity consumption over China typical urban driving cycle (CTUDC) is further reduced by 6.79% than that of multi-parameter rule-based shift schedule.

The use of fuzzy logic apparatus in development of expert systems for diagnosing traction electric motors of rolling stock

2020 ◽  
pp. 65-69
Author(s):  
Anna Vladimirovna Dolgova ◽  
◽  
Pavel Konstantinovich Shkodun ◽  
Keyword(s):  
Fuzzy Inference ◽  
Fuzzy Model ◽  
Technical Condition ◽  
Rolling Stock ◽  
Traction Motor ◽  
Electric Traction ◽  
Mechanical Machining ◽  
Comprehensive Indicator ◽  
Electric Traction Motor

The paper discusses the development of an expert system for diagnosing electric traction motors of rolling stock. The diagnostic parameters of the electric traction motor commutator-and-brush assembly, being the input linguistic variables of the fuzzy model, were selected with the use of graphoanalytic model. A fuzzy mathematical model and a fuzzy neural network for comprehensive indicator of quality of mechanical machining implementing the Takagi — Sugeno fuzzy inference algorithm were developed. The authors confirmed the practicability and the adequacy of the previously proposed comprehensive indicator of quality of mechanical machining for assessing the technical condition of the electric traction motor commutator-and-brush assembly. The studies carried out allowed creating an element of intelligent expert diagnostics system that enables a comprehensive assessment of technical condition of electric traction motor.

scholarly journals Evaluation of the intensity and discomfort of perioperative thirst

2018 ◽  
Vol 22 (3) ◽  
Author(s):  
Isadora Pierotti ◽  
Isabela Fernanda Larios Fracarolli ◽  
Lígia Fahl Fonseca ◽  
Patrícia Aroni
Keyword(s):  
Descriptive Study ◽  
P Value ◽  
Related Factors ◽  
Cross Sectional ◽  
Recovery Method ◽  
Mean Intensity ◽  
Numerical Scale ◽  
Study Results ◽  
Spearman Coefficient ◽  
The Mean

Abstract Objective: To evaluate the intensity and discomfort of perioperative thirst and related factors during anesthesia recovery. Method: This is a quantitative, cross-sectional, descriptive study. Results: Of the 203 participants, 182 (89.6%) reported they were thirsty. The mean intensity of thirst was 6.9 measured using a verbal numerical scale of 0 to 10 and discomfort was 7.3 on a scale of 0 to 14. All attributes evaluated by the scale were cited including dry mouth and desire to drink water (87.3%), dry lips (79.1%), thick tongue feeling (43.4%), thick saliva (56.5%), dry throat (75.2%) and bad taste in the mouth (63.1%). There was a positive correlation between the intensity of thirst and discomfort assessed by the scale (Spearman coefficient: 0.474; p-value: <0.05). No correlation was found between age, length of fasting and use of opioids with the intensity of thirst and discomfort. Conclusion and implication in the clinical practice: Discomfort arising from the attributes of thirst is evidenced as the intensity of thirst increases.

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