The paper deals with innovations in vehicle suspension technology developed in the Josef Bozek´s Research Center of Combustion Engines and Automobiles at CTU in Prague, Czech Republic. A unique innovative suspension system that uses a linear electric motor as a controlled actuator has been designed. Many experiments on the energy management in the system have been accomplished. In order to verify various control strategies and to test different ways of energy consumption optimization we designed and constructed a unique onequarter- car test stand. To realize simulation and practical experiments at the test stand it is necessary to find a proper experimental road disturbance signal to excite the active suspension system. The disturbance signal is applied on one more linear motor that is placed under a wheel of the one-quarter-car test stand to excite the active suspension system. The paper deals with the way and results of experimental verification of vehicle active suspension behavior when robust control is applied and also with energy management strategy that is used in the system. A modified H-infinity controller that enables to set energy management strategy is mentioned in the paper. At the close of the paper, some experiments taken on the one quarter-car model and their evaluation are discussed.
Trans Motauto World
Vol. 6 (2021), Issue 4
Table of Contents
TRANSPORT TECHNICS. INVESTIGATION OF ELEMENTS. RELIABILITY
Modern trends in the movement of freight rail cars are associated with improved technical and economic movement of rolling stock. GSKBV (Mariupol, Ukraine) in collaboration with the branch institutes of Ukraine and the Ukrainian Railways are developing promising models of freight cars. One of these cars is a thermos car. The technical solutions used made it possible to create a thermos car with improved technical and economic capabilities. The obtained scientific and technical groundwork for the creation of this car allows us to carry out further work on the creation on the basis of the presented design – a car with an autonomous cooling system.
The paper presents the design and construction process of a series of four multipurpose ships for SME shipyard with some restrictions in production facilities. This process is based on software that is available free or the some tasks could be subcontracted by SME. The main dimensions are optimized by the system “Expert” and hull forms are generated by PolyCAD. Due to the restriction in the production facilities the ships are with the same breadth and for additional unification the depth is also equal. Three different hull structure topologies are evaluated by MARS2000 software and modeled by AVEVA Marine design software. The analysis includes evaluation of manhours for construction of parallel mid-body of the all variants. The analysis takes into account the restricted preassembly space and human recourse, lifting capacity of building crane, geometry of building slipway etc. Some conclusions for labor intensity and inf luence of series function are made based on the presented data.
The paper deals with the problem of joints of car parts of the car construction. The construction of the car must meet the emission standards, in order to meet them it is necessary to reduce the weight of the car while maintaining strength and durability. Therefore, different materials are used in the design of car construction, such as different types of steels, aluminum alloys, composites and plastics. This increases the demands on the car construction and on the type of sheet metal joining technology used. The paper deals mainly with glued and welded joints in the design of car construction. The suitability of individual types of joints is solved using the finite element method.
TRANSPORT. SAFETY AND ECOLOGY. LOGISTICS AND MANAGEMENT
Features of activity of the international airports of the world in the conditions of a pandemic are considered. The losses of the world’s airlines are given. The condition of aircraft manufacturers is assessed. The activity of the main international airports of Ukraine in recent years is analyzed. The programs of development of the international airports of Ukraine for the near future are considered.
Creation of safe and secure parking areas network for trucks in georgia for systematization of road freight flowpg(s) 136-137
Road freight is the key element of the land freight system in Georgia and the main component of the South Caucasian transport corridor connection Black Sea port with Azerbaijan, Armenia, Iran and middle Asian countries. The creation of effective road system and appropriate infrastructure, based on the best European experience is the most important logistical goal has to be achieved in Georgia today. One of the main elements of this infrastructure are the safe and secure areas for trucks, yet to be created in Georgia.
This paper deals with passenger railway transport accessibility of the city of Chomutov, Czech Republic. The paper presents a conceptual study of a new transportation hub – the Transferium. Based on the unsuitable accessibility of the existing railway station, the location of a new railway station is proposed. The paper addresses the transport and transit demands of the new railway station in the context of current and future traffic. Furthermore, the urban integration of the new station and the surrounding urban space is proposed, and last but not least, the construction and technical context is presented.
The subject of research of this article is the review of passenger transport by all types of traffic on the territory of Montenegro in the past few years. The number of passengers transported by rail was accompanied by a constant increase in transported passen gers from 2013 to 2016. After that, we have a drop in the number of passengers transported by rail in 2017. The number of passengers transported by road in Montenegro is constantly increasing from year to year. There has been a constant increase in the number of passengers transported at Montenegrin airports. As passenger transport is a very important activity of every country, in the last few years the state of Montenegro has been working on improving the transport infrastructure and the process of passenger transport.
The population of the city of Tirana is getting bigger. Transportation in this city has become extremely heavy. Many of its citizens choose to move using their vehicles thus causing an overcrowded traffic. It has happened to all of us to get stuck in the traffic of Tirana, to be late for our destinations and to be stressed by that chaos.
The use of public transport would be a successful way of reducing the traffic. In this paper we have treated Dijkstra Algorithm and its application in railway system of transport for the proposed Tram system for the city of Tirana. Considering the expansion(map) and relief of this city, we think that it is very favorable to build a tram system in this city. The results of this paper help to have a clear idea of the construction of the tram and a prediction of how it will work and how much it can facilitate the traffic in Tirana.
The accident severity index of Albania has shown an increasing trend, although in 2020 there was a marked decrease of total accidents but some increase of fatal accidents. Looking at various risk factors—time, location, or speeding—this paper aims to develop a probability model that predicts accident-risk levels—flagging particularly hazardous locations or dangerous stretches of highway throughout the country—by using a Poisson model under a Bayesian Approach that can be used to predict the number of accidents occurring in a city per year from data collected.. From statistical data of a year of reference, the parameters of these model are comp uting, with which the final distribution is considered that predicts the occurrence of car accidents in a city. The model can be very useful to those who working in the transportation and public safety sectors providing them information that could help make modifications, whether it is designs of the road or different signage, to protect drivers and citizens.
Redesigning the layout of an existing railway station according to the tsi and ordinance no. 55 reqirements in the case of uninterrupted mainline operationpg(s) 154-158
In this paper, the problems in redesigning a new track layout of an existing railway station according to the reqirements in the TSI “Infrastructure” and Ordinance No. 55 are examined and analyzed in the case of maintaining mainline operation during construction. The paper has been compiled on the basis of experience in designing the track layout of 3 existing railway stations from the Bulgarian network, as well as experience working with the current regulations and interoperability reqirements of the railway systems in the EU. The necessities for making changes in vertical and horizontal track alignment and switch layout are considered in opposition to the technolog ical, electrical and gauge limitations when carrying out construction works without the complete disruption of railway traffic. The conclusions of the report are formulated as guidelines for good practices when redesigning an existing layout – the practices that fully satisfy the imperative norms and balances between contradictory equirements.