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  • Transport Problems

 

Article | 18-March-2018

ANALYSIS OF HYDROSTATIC MECHANICAL TRANSMISSION EFFICIENCY IN THE PROCESS OF WHEELED VEHICLE BRAKING

To analyze the braking process of a mine diesel locomotive with hydrostatic- mechanical transmission (HSMT), a mathematical model has been developed. In contrast to available models, this one takes into consideration rules of changes in controlling the parameters of hydrostatic drive (HSD) and implementation methods for the braking process. Moreover, the model makes it possible to study changes in kinematic parameters, power parameters, and energy parameters of HSMT under various conditions of

Igor TARAN, Iryna KLYMENKO

Transport Problems, Volume 12 , ISSUE SE, 45–56

Article | 30-July-2018

GENERATING AND MODELING OF BRAKING CURVE AND THE ASSESSMENT OF THE QUALITY OF AUTOMATIC STOPPING OF THE TRAIN

This paper presents the theory about generating the braking curve and the analysis of the influence of the braking controller parameters on the generation of the braking curve of the train. In this paper, computed examples of braking quality developed using generic quality factor are shown, and on the basis of the calculations, weight components of the factor and an additional criterion for assessing the quality of braking were proposed. It has been demonstrated that the developed algorithms

Jan Anuszczyk, Andrzej Gocek, Krzysztof Pacholski, Bartosz Dominikowski

Transport Problems, Volume 13 , ISSUE 2, 13–25

Article | 05-September-2020

POWER FLOWS IN A HYDROSTATIC-MECHANICAL TRANSMISSION OF A MINING LOCOMOTIVE DURING THE BRAKING PROCESS

This paper considers the braking process of a mine diesel locomotive with hydrostatic mechanical transmission (HSMT) operating according to the “input differential” scheme. Braking process modeling involves four implementation methods. Identification and systematization of basic regularities in the distribution of power flows within a closed transmission contour in the process of braking have been performed with the help of software support developed by means of MatLab/Simulink. The

Vadym SAMORODOV, Anatoliy BONDARENKO, Igor TARAN, Iryna KLYMENKO

Transport Problems, Volume 15 , ISSUE 3, 17–28

Article | 31-July-2018

BRAKING EFFICIENCY DETERMINED USING AN ACCELEROMETER IN THE ASPECT OF TECHNICAL CONDITION OF SHOCK ABSORBER

This article presents results of tests of the effect exerted by technical condition of shock absorbers on the braking efficiency of an automotive vehicle. The tests were conducted using Fiat Seicento featuring front shock absorbers which enabled shock-absorbing fluid-level adjustment. The tests comprised measurements conducted on the shock absorbers in four states, i.e. the nominal state with the fluid level at 100%, with shock-absorbing fluid levels of 25%, 50% and 75% as well as with the

Łukasz Konieczny, Rafał Burdzik, Jan Warczek, Robert Jaworski, Bogusław Śleziak

Transport Problems, Volume 13 , ISSUE 2, 81–90

Research Article | 02-February-2017

Probabilistic Approach for the Determination of Cuts Permissible Braking Modes on the Gravity Humps

The paper presents the research results of cuts braking modes on the gravity humps. The objective of this paper is developing the methods for assessment of braking modes of cuts under conditions of fuzziness of their rolling properties, as well as selecting the permissible starting speed range of cuts from retardant positions. As a criterion for assessing the modes of target control of cut rolling speed, it was proposed to use an average gap size on a classification track at the established

Volodymyr BOBROVSKYI, Dmytro KOZACHENKO, Andrii DOROSH, Evhen DEMCHENKO, Tetiana BOLVANOVSKA, Anton KOLESNIK

Transport Problems, Volume 11 , ISSUE 1, 147–155

Article | 08-December-2019

THE INFLUENCE OF THE «TRAIN-TRACK» SYSTEM PARAMETERS ON THE MAXIMUM LONGITUDINAL FORCES' LEVEL

The main objective of the simulation is to study the effect caused by the parameters of the longitudinal profile on the maxima of longitudinal forces in freight trains of increased length during adjustment braking and running-out. To decrease the number of numerical experiments, some empirical formulae for estimating the maximum longitudinal forces during the motion of freight trains along the track with various configurations of its longitudinal profile's gradient changes have been

Oleksandr PSHINKO, Liudmyla URSULYAK, Serhii KOSTRYTSIA, Yevhen FEDOROV, Anzhela SHVETS

Transport Problems, Volume 14 , ISSUE 4, 161–172

Article | 26-March-2020

ANALYSIS OF THE DYNAMICS OF VEHICLE MOTION IN CASE OF SUDDEN BRAKING CONNECTED WITH DAMAGE OF THE TIRE

One of the urgent problems to be solved in the analysis of road traffic accidents is the calculation of vehicle speed at the time of sudden braking. This makes it possible to determine the dynamics of further movement of the vehicle and to determine the technical ability of the driver to prevent a traffic collision. The article presents a method employed in calculating the speed of the car at the time of sudden braking and determines the dynamics of movement up to its complete standstill. The

Valery KOVALEV, Igor BLYANKINSHTEIN, Dmitry MOROZOV, Andrew KAZANTSEV

Transport Problems, Volume 15 , ISSUE 1, 15–24

Research Article | 02-February-2017

STRUCTURAL ANALYSIS OF RAILWAYS BOLSTER-BEAM UNDER COMMERCIAL OPERATION CONDITIONS: OVER-TRACTION AND
OVER-BRAKING

Summary. The conditions for the operation of railway systems are closely related to the increase of the commercial demand; as a consequence, the performance of the structural elements of railways changes. The present paper focuses on a study of the structural behaviour of bolster-beams under commercial operation conditions of railway systems, specifically in the dynamic conditions generated in events of over-traction and over-braking on the vehicle running. The proposed

Ronald M. MARTINOD, German R. BETANCUR, Jorge L. RESTREPO, Leonel F. CASTAÑEDA

Transport Problems, Volume 11 , ISSUE 2, 67–77

Research Article | 30-March-2017

PROVIDING STABLE FRICTION PROPERTIES OF DISC BRAKES FOR RAILWAY VEHICLES

Summary. A new approach is developed to ensure the stability of the coefficient of friction at different braking modes for the entire speed range of braking high-speed ground transport. The new approach is a combination of friction materials with individual effort effects on the brake disc. A brake pad design and its performance are confirmed experimentally.

Yuri Y. OSENIN, Douma Mansur AL-MAKHDI, Oksana SERGIENKО, Igor SOSNOV, Aleksei CHESNOKOV

Transport Problems, Volume 12 , ISSUE 1, 63–71

Research Article | 02-February-2017

ANALYTICAL RESEARCH ON THE GRIP VARIATION OF TWO-AXLE CAR

Summary. This paper presents a theoretical investigation on the decrease in grip coefficient of a car due to the car mass changes for three different running conditions- straightforward, motion in curve and braking. The grip of two types of cars - with forward and rear traction, equipped with three models of tires are studied. The results show a significant decrease of the grip coefficient in longitudinal and lateral directions.

Rosen IVANOV

Transport Problems, Volume 11 , ISSUE 4, 5–13

Article | 03-October-2018

SOME GUIDANCE IN THE DESIGNING OF A ROLLER FOR THE AUTOMOTIVE TESTERS

This work presents some aspects related to the designing of a roller for stands that are intended to determine the parameters of the transmission of a vehicle, such as braking force, wheel revolutions, etc. The computational scheme of simply supported beam is used to create an analytical mechanical-mathematical model through which a multicriteria optimization problem has been solved. A finite element macro and submodel of the roller has been created, and by using the R1MS technique, the fatigue

Yulian ANGELOV, Ivo DRAGANOV

Transport Problems, Volume 13 , ISSUE 3, 97–108

Research Article | 02-February-2017

VEHICLE DRIVING CYCLE OPTIMISATION ON THE HIGHWAY

Summary. This paper is devoted to the problem of reducing vehicle energy consumption. The authors consider the optimisation of highway driving cycle a way to use the kinetic energy of a car more effectively at various road conditions. The model of a vehicle driving control at the highway which consists of elementary cycles, such as accelerating, free rolling and deceleration under forces of external resistance, was designed. Braking, as an energy dissipation regime, was

Zinoviy STOTSKO, Myroslav OLISKEVYCH

Transport Problems, Volume 11 , ISSUE 2, 123–131

Article | 01-March-2015

THE BENDING MODE CONTROL METHOD OF AFS SYSTEM BASED ON PREVIEW CONTROL

Due to the time-lag of both the mechanical transmission and controller area network (CAN) bus transmission of the Adaptive Front Lighting System (AFS), the actual bending angle of AFS invariably lags behind the steering-wheel angle,which not only makes the real-time response speed of the AFS system slow, but also makes the system stability and the active safety of the vehicle poor. To solve the problem, firstly, the geometrical relations among safety braking distance and the rate of steering

Li Lifu, Yang Mingjun, Zhang Jinyong

International Journal on Smart Sensing and Intelligent Systems, Volume 8 , ISSUE 1, 637–657

Research Article | 01-June-2011

DESIGN AN INTELLIGENT CONTROLLER FOR FULL VEHICLE NONLINEAR ACTIVE SUSPENSION SYSTEMS

. The advantage of this controller is that it can handle the nonlinearities faster than other conventional controllers. The approach of the proposed controller is to minimize the vibrations on each corner of vehicle by supplying control forces to suspension system when travelling on rough road. The other purpose for using the NF controller for vehicle model is to reduce the body inclinations that are made during intensive manoeuvres including braking and cornering. A full vehicle nonlinear active

A. A. Aldair, W. J. Wang

International Journal on Smart Sensing and Intelligent Systems, Volume 4 , ISSUE 2, 224–243

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