scholarly journals Influence of the traction force and the speed of movement on the strength characteristics of the locomotive axles

2021 ◽  
Vol 27 (4) ◽  
pp. 125-133
Author(s):  
Vasko Nikolov
Keyword(s):  
Traction Force ◽  
Strength Characteristics ◽  
Deformation Characteristics ◽  
Modes Of Operation ◽  
Transmission Mechanisms ◽  
Traction Motors ◽  
Strength And Deformation ◽  
Traction Characteristic ◽  
Loading Modes ◽  
The Relationship

The article presents the dependencies obtained when researching the load on the locomotive axles, depending on the traction force and the speed of movement of the locomotive. The traction characteristic of the locomotive is the relationship between the traction force achieved by the traction motors and the speed of movement, and it is different under different driving conditions. Different modes of operation of locomotive axles are considered. A simulation of the axles' behaviour has been developed. The strength and deformation characteristics of the locomotive axles under different loading modes are calculated. A comparative analysis of the strength characteristics of locomotives with different classes of transmission mechanisms has been made

scholarly journals Study on Strength Characteristics of Cement-Solidified Bauxite Tailings Slime

2021 ◽  
Author(s):  
Kai Xu ◽  
Zhiqiang Wu ◽  
Zhihuan Wang ◽  
Jie Ren ◽  
Shuaiheng Li
Keyword(s):  
Compressive Strength ◽  
Brittle Failure ◽  
Strength Characteristics ◽  
Deformation Characteristics ◽  
Test Results ◽  
Tailing Pond ◽  
Bauxite Tailings ◽  
Strength And Deformation ◽  
The Impact ◽  
Debris Flow Hazard

The wet slime tailing pond formed during the production of accumulated bauxite is a source of artificial debris flow hazard with high potential energy. In order to explore the effectiveness of solidification technology in processing bauxite slime, experimental study was conducted on the strength characteristics of cement-solidified slime with bauxite slime as the test object, so as to investigate the impact of cement contents and curing ages on the compressive strength of cement-solidified slime. According to the test results, the strength and deformation characteristics of solidified slime are related to the cement content, and the higher the cement admixed amount, the greater the compressive strength of solidified slime; the cement-solidified slime samples are subject to brittle failure, and with the increase of strain, the stress first rises to its peak and then decreases rapidly. The findings may serve as reference in processing bauxite slime.

TRACTION DRIVE OF LOCOMOTIVES WITH HIGH MOMENTUM COLLECTOR TRACTION ELECTRIC MOTOR

2021 ◽  
Vol 2 ◽  
pp. 118-129
Author(s):  
O.V. DOROFEEV ◽  
V.I. VOROBYEV ◽  
M.I. BORZENKOV ◽  
O.V. IZMEROV ◽  
S.N. ZLOBIN
Keyword(s):  
Traction Force ◽  
Optimal Solution ◽  
Practical Implementation ◽  
Traction Drive ◽  
Traction Motors ◽  
Utility Models ◽  
High Torque ◽  
Traction Drives ◽  
Technical Solutions ◽  
Traction Electric Motor

The issues of development of traction drives of locomotives are considered. It was found that with the existing limitations of the traction force and the speed of continuous operation, asynchronous traction motors do not have clear advantages over collector motors. The possibility of creating collector motors for electric locomotives with a power equal to the used asynchronous ones has been proved, new technical solutions have been proposed for units that ensure the reliability of the latter when using high-torque motors (elastic gearwheel with chevron teeth, two-layer rubber-metal hinge, rubber-cord clutch options), as an optimal solution for the drive with collector motors, it is proposed to use a drive with a support frame motor and an axial gearbox. The directions of research necessary for the practical implementation of drives with a high-torque traction motor are determined, it is proposed to conduct research on the feasibility of creating diesel locomotives with bogies, unified with electric locomotives. The proposed solutions received two patents for inventions, eight patents for utility models, two patent applications were filed.

scholarly journals ACCOUNTING FOR THE INFLUENCE OF HUMIDITY PROPERTIES OF AUTOCLAVE- CURED CELLULAR CONCRETE IN THE DESIGN AND CONSTRUCTION OF ENCLOSING STRUCTURES

2021 ◽  
pp. 88-99
Author(s):  
Valeriy STROTSKIY ◽  
Aleksey KROKHIN ◽  
Vladimir SAVIN
Keyword(s):  
Frost Resistance ◽  
Pore Space ◽  
Deformation Characteristics ◽  
Solid Ratio ◽  
S Factor ◽  
Negative Temperatures ◽  
Main Factors ◽  
Surface Tension Forces ◽  
The Relationship ◽  
Cellular Concrete

The results of studies of porosity, water absorption, moisture shrinkage and frost resistance of cellular concrete, which are some of the main factors determining the durability of cellular concrete enclosing structures manufactured using autoclave hardening technology, are considered. Methods for determining water absorption, moisture shrinkage and frost resistance are presented. The relationship between the moisture shrinkage and the capillary forces (the sum of the surface tension forces on the micromeniscs of liquid in the capillaries of cellular concrete), as well as the dependence of the shrinkage on the size (radius) of the capillary and gas pores of cellular concreteand on the water-solid ratio (W/S-factor) of cellular concrete, is established. In the field of frost resistance of cellular concrete, the relationship between the structure of the pore space of concrete and its deformation characteristics under the action of negative temperatures is studied. The effect of the presence of gas pores in cellular concrete on the reduction of frost expansion deformations is described.

scholarly journals Strength and Deformation Characteristics of the Neogene Siltstone, exampled from Middle Formation of Kazusa Group.

1993 ◽  
Vol 34 (5) ◽  
pp. 233-244 ◽  
Author(s):  
Takayasu HOSONO ◽  
Masayuki NAKAJIMA ◽  
Kazuhiro KOIZUMI ◽  
Nobutaka SUGITA ◽  
Shohji OGAWA
Keyword(s):  
Deformation Characteristics ◽  
Strength And Deformation

scholarly journals Experimental Study on Shear Failure Mechanism and the Identification of Strength Characteristics of the Soil-Rock Mixture

2019 ◽  
Vol 2019 ◽  
pp. 1-25
Author(s):  
Shaorui Sun ◽  
Feng Zhu ◽  
Jihong Wei ◽  
Wuchao Wang ◽  
Huilin Le
Keyword(s):  
Failure Mechanism ◽  
Shear Failure ◽  
Horizontal Displacement ◽  
Strength Characteristics ◽  
Laboratory Model ◽  
Gravel Size ◽  
Shear Process ◽  
Composition Materials ◽  
The Relationship ◽  
Laboratory Models

Soil-rock mixture (SRM) is a special geological material that has the unique properties of rock or soil. Studies on the strength characteristics of the SRM have very important theoretical significance and practical value. In this study, the gravel proportions, gravel sizes, gravel shapes, and repetitive results of shear experiments are considered in laboratory experiments and for the identification of strength parameters. To the gravel shapes, from the angle of the composition materials of SRM, the experimental samples include samples with breccia gravels and with subrounded gravels. And, in this study, the laboratory model experiment is used to research the strength characteristics of SRM. In addition, the shear failure mechanism is used to establish the relationship between the microfailure mechanism and the macrostrength parameters identification. Taking gravel proportion, gravel size, gravel shape, and repetitive shear process as the influencing factors of the SRM, the laboratory models have been remolded, and laboratory direct shear experiments have been carried out. The shear deformation laws of the SRM are researched on the basis of the analysis of the curves of shear stress and the horizontal displacement.

scholarly journals Effects of loading rate on strength and deformation characteristics of gypsum mixed sand

2019 ◽  
Vol 92 ◽  
pp. 05008
Author(s):  
Zain Maqsood ◽  
Junichi Koseki ◽  
Hiroyuki Kyokawa
Keyword(s):  
Strain Rate ◽  
Axial Strain ◽  
Constitutive Modelling ◽  
Strain Rates ◽  
Deformation Characteristics ◽  
Wide Range ◽  
Strength And Deformation ◽  
Loading Tests ◽  
Rational Evaluation ◽  
Strain Responses

It has been unanimously acknowledged that the strength and deformation characteristics of bounded geomaterials, viz. cemented soils and natural rocks, are predominantly governed by the rate of loading/deformation. Rational evaluation of these time-dependent characteristics due to viscosity and ageing are vital for the reliable constitutive modelling. In order to study the effects of ageing and loading/strain rate (viscosity) on the behaviour of bounded geomaterials, a number of unconfined monotonic loading tests were performed on Gypsum Mixed Sand (GMS) specimens at a wide range of axial strain rates; ranging from 1.9E-05 to 5.3E+00 %/min (27,000 folds), and at different curing periods. The results indicate shifts in the viscous behaviour of GMS at critical strain rates of 2.0E-03 and 5.0E-01 %/min. In the light of this finding, the results are categorized into three discrete zones of strain rates, and the behaviour of GMS in each of these zones is discussed. A significant dependency of peak strength and stress-strain responses on strain rate was witnessed for specimens subjected to strain rates lesser than 2.0E-03 %/min, and the effects of viscosity/strain rate was found to be insignificant at strain rate higher than 5.0E-01%/min.

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