TRANSPORT ENGINEERING
ISSN (print): 2782-5957
Media registration certificate: ПИ № ФС77-75522 от 12.04.2019
Founder: Bryansk State Technical University
Editor-in-Chief: Khandozhko Alexandr, Doctor of Sc., Associate Professor
Frequency / Assess: 12 issues per year / subscription
Included in: Higher Attestation Commission List, RISC
Edição corrente
Nº 8 (44) (2025)
Mechanical Engineering
STRUCTURAL SYNTHESIS OF EIGHT-BAR CLOSED KINEMATIC CHAINS OF THE FIRST FAMILY ELEVENTH SUBFAMILY MOVABLE LINKS OF THE FOURTH TYPE
Resumo
The study objective is to develop a method for the structural synthesis of closed kinematic chains of moving links of the first family (CKC) into the eleventh subfamily.
The tasks are the following: based on the universal structural system (USS) of CKC, determine the composition of eight-bar CKCs of the eleventh subfamily of the fourth type and consider the procedure for applying the solutions obtained for the synthesis of structural circuits of these chains.
Research methods: USS structural synthesis method, set theory and combinatorics, virtualization, identification and coding, graph theory.
The novelty of the work: the features of USS use for determining the composition of eight-bar CKCs of the eleventh subfamily of the fourth type are considered, formation of structural schemes of these chains is discussed.
Research results: combinations of kinematic pairs and links are found that make it possible to construct all possible structural schemes of eight-bar CKCs of the eleventh subfamily of the fourth type. A diagram of eight-bar CKCs of the eleventh subfamily of the fourth type is obtained.
TRANSPORT ENGINEERING. 2025;(8 (44)):4-11
4-11
EFFECT OF HIGH-MELTING COMPONENTS ON THE WEAR RESISTANCE OF THE SURFACING MATERIAL
Resumo
The study objective is to study the wear resistance of surfacing materials.
The task to which the paper is devoted is to increase the inter-repair operation period of gravity roll carrier elements operating in harsh conditions.
A method is presented for restoring worn parts by electrode surfacing with flux cored wire with high-melting components under a layer of flux. It is known that when high-melting components such as tungsten (W), tungsten carbide (WC) and boron nitride (BNg) are added to the charge, the hardness and wear resistance of the restored surfaces increase. For surfacing the experimental samples, substrates made of steel grade 30HGSA GOST 4543-2016 with a diameter of 80 mm and a thickness of 20 mm are used. The samples are deposited in the laboratory for the restoration and hardening of mining and metallurgical equipment parts at NUST MISIS. The surfacing is carried out under a layer of keramax UF-02 grade flux. Thermal treatment is performed to relieve the internal stresses of the samples. The samples are cut on a multifunctional cutting machine. Further, the samples are subjected to abrasion by abrasive wear and abrasion under sliding friction conditions on special laboratory installations. The method of testing for abrasive wear and abrasion under sliding friction conditions is described.
The novelty of the work is in the study of the wear resistance of experimental surfacing materials when worn under conditions of sliding friction and abrasive wear, and their comparison with hardness.
The results of experimental studies of abrasive wear and abrasion under sliding friction conditions of deposited materials are presented. Conclusions are given for each studied material.
Conclusions: based on the test results, further directions have been formulated for the study of surfacing materials for machinability by cutting, with the subsequent determination of the rational ratio of high-melting components of flux cored wire.
TRANSPORT ENGINEERING. 2025;(8 (44)):12-26
12-26
EFFECT OF MODES ON FRICTION COEFFICIENT IN THE CUTTING AREA WHEN TURNING TN1 ALLOY
Resumo
The study objective is to determine the rational turning modes of TN1 alloy according to the lowest friction coefficient in the cutting area. The tasks to which the paper is devoted are: to draw up an experiment plan for turning the workpiece under various cutting modes; to measure the chip thickness using Compass-3D graphic editor for each cutting mode; to calculate the values of the chip shrink factor for each of the cutting modes; to calculate the values of friction coefficient between the chip and the cutting tool; to find the dependence of friction coefficient from cutting modes; to determine the turning mode in which friction coefficient has the lowest value. To achieve this goal, experimental studies are conducted to determine the values of chip shrinkage under various cutting modes. According to the found values of the shrink factor, the friction coefficients in the cutting area between the chips and the front surface of the cutter are calculated. As a result of the research, empirical dependences are found that make it possible to calculate the value of the friction coefficient between the front surface of the cutter and the chips when turning TN1 alloy with an error of less than 1.4%. The rational modes corresponding to the lowest friction coefficient in the cutting area are experimentally determined.
TRANSPORT ENGINEERING. 2025;(8 (44)):27-33
27-33
SPECIFIC CHARACTER OF USING ROLLING BEARINGS IN HIGH-SPEED SPINDLE ASSEMBLIES DURING REPAIR
Resumo
Design solutions used in spindle assemblies of modern mass-produced metal-cutting machines as well as the repair features of bearing supports are considered. The main attention is paid to the specific character of using rolling bearings in high-speed spindle assemblies, their selection, preparation for installation and installation itself.
TRANSPORT ENGINEERING. 2025;(8 (44)):34-44
34-44
Transport Systems
ANALYSIS OF IRREGULARITIES TYPES IN ASSESSING THE DYNAMIC LOAD OF SHUNTING LOCOMOTIVES
Resumo
The paper considers the influence of various types of butt irregularities of the railway track on the dynamic loading of load-bearing structures of shunting locomotives. Domestic and foreign documents regulating the calculated irregularities are analyzed. The study uses the Universal Mechanism software package, which is applied to simulate dynamic loads during the movement of TEM2 locomotive along tracks with different types of irregularities. The calculation results show that the introduction of butt irregularities into the model leads to an increase in the vertical dynamics coefficient at low speeds, which is typical for shunting locomotives. The maximum values of the dynamics coefficient are obtained at the speed of 25 km/h. The results obtained confirm the need to take into account butt irregularities when estimating the dynamic load of a rolling stock and predicting its residual life.
TRANSPORT ENGINEERING. 2025;(8 (44)):45-54
45-54
FATIGUE TESTS OF SOLEBARS AND BOLSTERS OF FRIEGHT CAR BOGIES
Resumo
The paper describes the procedure for carrying out and the results of fatigue tests of bolsters and solebars of car bogies. The results of fatigue testing and control for compliance with mechanical properties, surface quality, micro- and macrostructure are compared with the values regulated by state standards and regulatory documents. The causes of occurring and propagating of cracks in the bolsters and solebars of car bogies, identified by the magnetic powder method of non-destructive testing are estimated. Fatigue curves of the studied test objects are constructed on the basis of experimental data. Ways to increase the strength of the considered structures are proposed.
TRANSPORT ENGINEERING. 2025;(8 (44)):55-65
55-65
WEAR OF THE CONNECTING ROD-PISTON FRICTION PAIRS OF THE CAR IN OIL STARVATION MODE
Resumo
The paper considers the connecting rod-piston group of a car engine, in particular, the conical and connecting rod necks. It is shown that in the oil starvation mode, the crankshaft and connecting rod necks are subject to wear and lead to engine malfunction and shutdown. It is found that oil starvation occurred as a result of the discrepancy between the manufacture material and the hardness of the third necks in the third connecting rod bearing. It is shown that the cause of the accidental wear of the parts of the third connecting rod bearing (inserts and connecting rod neck) are defects in the manufacture of the crankshaft associated with the use of poor-quality structural material with an inhomogeneous structure (with non-metallic inclusions), as well as non–compliance with the manufacturing technology of the crankshaft (surface hardening technology - induction hardening).
TRANSPORT ENGINEERING. 2025;(8 (44)):66-76
66-76