scholarly journals ADVANCED CENTRAL SPRINGING DEVELOPMENT FOR DIESEL LOCOMOTIVES WITH ADAPTIVE CHARACTERISTICS

2020 ◽  
Vol 2020 (6) ◽  
pp. 31-37
Author(s):  
Evgeniy Slivinskiy ◽  
Valentin Kiselev
Keyword(s):  
Geometrical Parameters ◽  
Diesel Locomotive ◽  
Labor Conditions ◽  
Geometrical Characteristics ◽  
Design Reliability ◽  
Investigation Methods ◽  
Spring Suspension ◽  
Torsion Springs ◽  
Practical Recommendations ◽  
Calculation Procedures

The work purpose - the development of practical recommendations on the spring suspension (developed on the level of invention RU2606409) updating of diesel locomotive 2TE25K body equipped with three-axle bogies and calculation fulfillment for the substantiation of spring suspension basic geometrical parameters. Investigation methods – for realization of the purpose specified there are used modern calculation procedures of adaptive torsion springs that allowed substantiating efficient geometrical characteristics for the central suspension of the diesel locomotive body and there are given practical recommendations on the necessity of such bogies use in practice. Investigation results and novelty – the investigation results are passed to the leadership of the Yelets locomotive depot, it is also recommended to research and industrial heavy engineering bodies both, in our country and abroad with the purpose of its further study and its possible introduction into practice. Conclusions – analyzing the lines offered for locomotive body central suspension updating allows increasing locomotive motion smoothness, improving train crew labor conditions and increasing diesel locomotive design reliability on the whole.

ANALYSIS OF THE CREW PART OF THE LOCOMOTIVE TEM23 AND PROPOSALS FOR ELIMINATION OF DISADVANTAGES

2020 ◽  
Author(s):  
Dmitriy Antipin ◽  
Vladimir Vorobev ◽  
Denis Bondarenko ◽  
Gennadiy Petrov
Keyword(s):  
Vertical Plane ◽  
The Body ◽  
Diesel Locomotive ◽  
Design Features ◽  
Bogie Frame ◽  
Spring Suspension ◽  
In Series

The analysis of the design features of the bogie of the TEM23 shunting diesel locomotive is carried out. In the process of analysis, the directions of its improvement are determined. It is proposed to rotate the bogie frame in the vertical plane by reducing the body supports to two and using a pivot with low lowering, equip the bogies with pneumatic spring suspension in the form of two corrugations installed in series with shortened suspension springs. The proposed options for improving the undercarriage of a diesel locomotive will increase the competitiveness of products and reduce costs

scholarly journals Nonlinear analysis of magnetospheric data Part I. Geometric characteristics of the AE index time series and comparison with nonlinear surrogate data

1999 ◽  
Vol 6 (1) ◽  
pp. 51-65 ◽  
Author(s):  
G. P. Pavlos ◽  
M. A. Athanasiu ◽  
D. Kugiumtzis ◽  
N. Hatzigeorgiu ◽  
A. G. Rigas ◽  
...  
Keyword(s):  
Time Series ◽  
State Space ◽  
Null Hypothesis ◽  
Surrogate Data ◽  
Statistical Testing ◽  
Geometrical Parameters ◽  
Geometric Characteristics ◽  
Geometrical Characteristics ◽  
Ae Index ◽  
Index Time Series

Abstract. A long AE index time series is used as a crucial magnetospheric quantity in order to study the underlying dynainics. For this purpose we utilize methods of nonlinear and chaotic analysis of time series. Two basic components of this analysis are the reconstruction of the experimental tiine series state space trajectory of the underlying process and the statistical testing of an null hypothesis. The null hypothesis against which the experimental time series are tested is that the observed AE index signal is generated by a linear stochastic signal possibly perturbed by a static nonlinear distortion. As dis ' ' ating statistics we use geometrical characteristics of the reconstructed state space (Part I, which is the work of this paper) and dynamical characteristics (Part II, which is the work a separate paper), and "nonlinear" surrogate data, generated by two different techniques which can mimic the original (AE index) signal. lie null hypothesis is tested for geometrical characteristics which are the dimension of the reconstructed trajectory and some new geometrical parameters introduced in this work for the efficient discrimination between the nonlinear stochastic surrogate data and the AE index. Finally, the estimated geometric characteristics of the magnetospheric AE index present new evidence about the nonlinear and low dimensional character of the underlying magnetospheric dynamics for the AE index.

scholarly journals MODERNIZATION OF DIESEL LOCOMOTIVE SPRING SUSPENSION WITH JAW TROLLEYS

2019 ◽  
Vol 2019 (2) ◽  
pp. 48-55
Author(s):  
Евгений Сливинский ◽  
Evgeniy Slivinskiy ◽  
Сергей Радин ◽  
Sergey Radin
Keyword(s):  
Diesel Locomotive ◽  
Spring Suspension

scholarly journals Geometrical optimization for a photovoltaic installation equipped with flat reflectors based on plane of array estimations

2020 ◽  
Vol 11 ◽  
pp. 1 ◽  
Author(s):  
Christine Abdel Nour ◽  
Anne Migan-Dubois ◽  
Jordi Badosa ◽  
Vincent Bourdin ◽  
Claude Marchand ◽  
...  
Keyword(s):  
Power Production ◽  
Geometrical Parameters ◽  
Estimation Model ◽  
Geometrical Characteristics ◽  
Pv Module ◽  
Geometrical Optimization ◽  
Reflector System ◽  
The Mean ◽  
Experimental Validations ◽  
Geographical Characteristics

In order to design, manage and optimize the performance of a photovoltaic (PV) installation and establish a precise power production estimation, irradiance on the plane of array (POA) in relation with the geometrical characteristics of the PV modules installation occupies a high importance. This study focuses on the development of an estimation model of the POA irradiance for a photovoltaic installation equipped with flat reflectors. The model includes solar irradiance components (global, direct and diffuse), geometrical parameters and geographical characteristics of the PV installation. Experimental validations have been performed with measurements taken at the SIRTA Observatory (48.7°N, 2.2°E) in Palaiseau, France, for the period starting from June 2017 to June 2018. Results show mean absolute errors (relative to the mean) of 6% and 7% for an installation without and with planar reflector. Finally, we present several geometrical optimization strategies of the PV-reflector installation relying on two major variables: the reflector's length (LR) compared to the length of the PV module (LPV) and the tilt angle adjustment frequency (monthly, seasonally, fixed) of the system (for both PV and the reflectors). The objective of such optimization is to discuss about a reasonable configuration to achieve a maximum POA irradiance. Results show that the length of the mirrors highly affects the efficiency and performances of the PV-Reflector system and the annual gain increased from 8.5% to 28.7% when going from LR = LPV/2 to LR = 2 × LPV compared to a monthly-optimized installation without mirrors. As for the adjustment frequency, we show that a monthly-varied architecture is the most advantageous option with a 28.2 and 31.6% increasing in annual gain compared to a seasonal varied or fixed ones, respectively.

Numerical Modelling of Metal Foams with Weaire-Phelan Cell

2013 ◽  
Vol 334-335 ◽  
pp. 122-126 ◽  
Author(s):  
Sid Ali Kaoua ◽  
Haddad Meriem ◽  
Dahmoun Djaffar ◽  
Azzaz Mohammed
Keyword(s):  
Finite Element ◽  
Cross Section ◽  
Cross Sections ◽  
Metal Foam ◽  
Metallic Foam ◽  
Geometrical Parameters ◽  
The Finite Element Method ◽  
Geometrical Characteristics ◽  
Structural Network ◽  
Regular Network

The mechanical properties of open-cell metal foam structures are investigated using the finite element method. The foam structure is modelled by a regular network of anisotropic Weaire-Phelan cells in which the strands are modelled as 3D finite element beams. We consider four types of strand cross sections: (i) circular, (ii) square, (iii) triangular and (iv) Plateau border shape. The numerical results obtained with our proposed mathematical model are checked against the experimental results obtained on real Nickel metallic foam and an excellent agreement is found. In addition, we conducted a parametric analysis to study the effect of some geometrical characteristics on the elasticity of the metal foam. Among these geometrical parameters, the shape, the dimensions of strand cross section, the inertia, the alignment of strands and the structural network irregularities are investigated, discussed and documented.

Implementation of the EPRI Guidelines to Fatigue Analyses of Primary Circuit Components: Challenges and Recommendations in the Framework of Practical Application

2014 ◽  
Author(s):  
Sven H. Reese ◽  
Johannes Seichter ◽  
Dietmar Klucke ◽  
H. Ertugrul Karabaki ◽  
Wolfgang Mayinger
Keyword(s):  
Environmental Effects ◽  
The Other ◽  
Primary Circuit ◽  
Practical Application ◽  
Calculation Methods ◽  
Technical Report ◽  
Circuit Components ◽  
Practical Recommendations ◽  
Calculation Procedures ◽  
Numerical Approaches

The influence of LWR coolant environment to the lifetime of materials has been discussed recent years. Nowadays the environmentally assisted fatigue (EAF) is under consideration in Codes and Standards like ASME by formula calculation and in the German KTA Rules (e.g. KTA No. 3201.2 and 3201.4) in addition by means of so called attention thresholds. Basic calculation procedures in terms of quantifying the influence of LWR coolant environment by the so called Fen-factor were proposed in NUREG CR-6909 in 2007. Since this report the set of formulas have been adapted several times (e.g. in ANL-LWRS47-2011) and further changes in set of formulas are likely to occur. Subsequently a revision of the NUREG CR-6909 report is taking place incorporating recent changes. Within the EPRI 2012 Technical Report “Guidelines for Addressing Environmental Effects in Fatigue Usage Calculations” some practical recommendations for the application of the EAF to real components are stated. In this report EPRI presented the calculation of sample problems in combination with sample transients carried out by the participants and verifying the applicability of the proposed approaches. However, the EPRI guideline provides a set of tools taking environmentally assisted fatigue into account. This guidance figures out to be quite helpful on one hand, but incorporates some challenges in terms of practical application on the other hand. Additionally, the EPRI Report gives no clear advice which specific combination of calculation methods to apply finally. Within this publication the procedures proposed in the EPRI guideline will be applied to existing numerical approaches being published. Challenges when applying the methods defined in the EPRI guideline will be identified and solutions will be given. Additionally, recommendations will be stated based on the proposed procedures in terms of practical application especially in context of calculations for fatigue relevant primary circuit components.

TOOTH LEG EXCESSIVE UNDERCUT ELIMINATION IN HELICAL CYLINDRICAL GEARS WITH PROTUBERANCE OF HOBBING CUTTER BASED ON GRAPHIC RUN-IN

2021 ◽  
Vol 2021 (7) ◽  
pp. 19-27
Author(s):  
Damir Safarov ◽  
Aleksey Kondrashov ◽  
Ayrat Fashudtinov
Keyword(s):  
Boundary Point ◽  
Helical Milling ◽  
Transition Curve ◽  
Design Solution ◽  
Geometrical Parameters ◽  
Milling Cutter ◽  
Cylindrical Gears ◽  
Boundary Points ◽  
Investigation Methods ◽  
Gear Ring

In the paper there are considered procedures for designing a transition curved tooth leg of helical cylindrical gears. A significant parameter of a transition curve is a diameter of boundary points. The boundary point diameter belongs to a bottom point of the involute profile of the teeth side surface of a gear ring. The boundary point position must be lower of the design end point of the involute profile defined by the designer of gearing. A diameter value depends upon a great number of production factors: a profile and wear of a grinding disk, setting up parameters, teeth machining modes of a gear ring, but it is impossible to ensure the specified values of the diameter of boundary points without a correct design solution in the course of the form choice of milling cutter protuberance. The solution on protuberance acceptable parameters of a gear-cutting tool is made by the designer of a cutter during graphic run-in fulfillment. In the paper there are revealed conditions under which arise mistakes in the course of graphic run-in fulfillment within the limits of one teeth pitch of a milling cutter. There are shown recommendations for the fulfillment ensuring the diameter dimension of boundary points of the transition curve specified by the designer of gearing. The data on the design parameter impact of the hob protuberance upon the continuance of cutting edge interaction are shown. There are recommendations given to prevent undercut arising caused by the fulfillment of graphic two-dimensional run-ins of cylindrical helical gears. The work purpose: the elimination of tooth leg excessive undercut in helical cylindrical gears with the protuberance of a worm milling cutter at the expense of the fulfillment of graphic run-in conditions. The investigation methods: the graphical modeling of a run-in process. The investigation results and novelty: there are defined conditions of arising an excessive undercut in the tooth leg of helical cylindrical gears during the fulfillment of graphic run-ins of a tool rack. The conclusions: for mistake prevention in the calculations of the protuberance geometrical parameters of the helical milling cutter the graphic run-in must be carried out not less than on the 1.5 pitch of the milling cutter.

ESTIMATE OF DESIGN ELEMENT STRENGTH IN LONG-RANGE RADIAL CONTROL OF WHEEL PAIRS OF TEP60 DIESEL LOCOMOTIVE

2020 ◽  
Vol 2020 (8) ◽  
pp. 33-38
Author(s):  
Evgeniy Slivinskiy
Keyword(s):  
Long Range ◽  
Mechanical Engineering ◽  
Scientific Research ◽  
Geometrical Parameters ◽  
Design Element ◽  
Contact Strength ◽  
Diesel Locomotive ◽  
Operation Conditions ◽  
Standard Values ◽  
Run Up

The contact strength calculations of machinery on basic geometrical parameters of a diesel locomotive bogie developed with the use of current procedures are carried out. There is shown a possibility for its creation and testing under operation conditions. A diesel locomotive jawless bogie is created at the level of invention which is recommended by scientific-research and manufacturing structures in the field of heavy mechanical engineering both in our country and abroad with the purpose of the further analysis and possible its introduction into practice. There is presented a development of a new diesel locomotive undercarriage unknown in world practice and supplied with RUKP allowing increasing a diesel locomotive run up to standard values and decreasing costs for diesel locomotive industrial and depot repair works.

Object methods of geostatistical analysis for facies modeling

2021 ◽  
pp. 20-29
Author(s):  
Ya. V. Kuznetsova
Keyword(s):  
Geological Structure ◽  
Static Model ◽  
Geostatistical Analysis ◽  
Actual Data ◽  
Geometrical Parameters ◽  
Facies Modeling ◽  
Geostatistical Methods ◽  
Geometrical Characteristics ◽  
Data Object ◽  
Hydrocarbon Reserves

Facies cube is a required part of a static model, especially concerning fields characterized by complicated geological structure. The important quantitative limitations for modeling are facies proportions in the formation volume. Nowadays these proportions are calculated using standard geostatistical methods without considering particular properties of facies data. These properties are specific geometrical characteristics of sedimentological units. The consequences are significant differences between calculated and actual data and unreliable hydrocarbon reserves estimation.In order to enhance reliability of reserves estimation on the basis of 3D static models, this article is devoted to special methods of geostatistical analysis for facies data: object geometrization and object clustering. These methods allow taking into account specific geometrical parameters of formations deposited in different environments, therefore, allow reducing differences between calculated and actual facies data and enhancing reliability of reserves estimation.

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