This report analyzes the accuracy of predicting by the method of least squares and neuron networks. This study compares the errors and deviations of the predicted results from the actual ones. Considered are three options – when the parameter is defined by linear, quadratic and exponential law.
Frames composed of thin-walled beam elements are frequently used as load-carrying systems in engineering practice. In this work the influence of different structural joint types on torsional moment transmission from column to beam is analysed. Two types of beam cross sections are considered, the I-beam cross section and the channel one. Four different structural joints are examined for both cross sectional types. Numerical simulations are undertaken using MSC. Nastran’s shell model consisting of eight-nodded flat elements. The results obtained are discussed through the test problems.
This paper deals with the comparison of Control of quarter car vehicle suspension using Linear Quadratic Regulator (LQR) and Fuzzy Logic Controller (FLC) which are considered to control quarter car suspension and computer simulation is done on the nonlinear quarter-car model with actuator dynamics. The Linear Quadratic Regulator (LQR) and Linear Quadratic Gausian (LQG) methods are the most used control approaches. LQR and FLC provide the possibility to emphasize quantifiable issues of vehicle suspensions like; ride comfort and road holding for varying external conditions.
The growth rates vehicles pose a significant threat to the physical and chemical status of the atmosphere and negatively impact on human health and viability of other living organisms. The ecological status of airspace in the cities of the modern world, is determined by numerous factors, among which the leading position is taken by motor vehicles, during operation of which, along with the exhaust gases, more than 200 chemical compounds are emitted into the atmosphere.
The paper describes the results of studies of motor vehicles on highways adjacent to the territory of Kutaisi, from ecological standpoint.
As a realistic way for solving the problems would be the use of alternative fuels, rational organization and management of traffic flow, and the large-scale introduction of electric cars and hybrid motor vehicles.
The paper describes the urban passenger transport system which is a set of interdependent subsystems: «city», «transport», «passengers». The urban passenger transport performance indicators have been determined for all system participants. The objective functions of an optimization problem of urban passenger transport are given in general terms. The optimization criterion for traffic routing of urban passenger transport has been determined, which takes account of mutual influence of the interests of all system participants has been determined. The passenger traffic flow density on the studying road section, has been suggested as such optimization criterion. The formulation of an optimization problem of urban passenger transport have been defined as well.
The development of feeder networks in modern liner shipping has undergone significant changes during the last two decades. The hub-feeder systems and short sea shipping networks have largely expanded in the Black Sea and the Mediterranean regions due to fluctuating containerized cargo volumes. The present article analyses the feeder networks structure in the Black Sea region, examines the liner shipping connectivity based on the liner shipping connectivity index (LSCI) and further outlines the current trend of regional cargo transportation network expansion. The liner shipping connectivity index reflects the long-term objectives of liner operators for maximizing revenue via extensive market coverage. Despite the negative effect of the economic crisis and excess supply on the market a distinct trend towards increased service frequency and expanded geographical coverage are observed.
High quality of operational concepts in railway transport represents one of the basic premises of functional public transport system and public transport services. In this area the systematic timetable engineering plays an important role. Advanced timetable engineering brings a strong contribution for an effective use of infrastructure capacity. This systematic approach is very important, especially when the new railway service is being introduced on such railway line, which is in the state of reconstruction with numerous restrictions. The article demonstrates this approach on the example of the introduction of new express trains Prague – Linz in the timetable 2016/17.
Russian-Armenian (Slavonic) University, Yerevan, Armenia.This research work is devoted to the trends for further development of the New Silk Road. In the framework of the study, the authors have analyzed the export and import of all potential participant countries of the New Silk Road, examined the Northern, Central and Southern corridors. They have also identified alternative directions for transportation of goods from China through the countries of Central Asia to Russia and Europe. At the same time, according to the calculations carried out to assess the volumes of transit cargo flows on the alternative routes offered by the central and southern international transport corridors, the authors have highlighted the strategic role of Iran in the distribution of cargo flows.
The issues related to road safety and the complexity of the driving task present a continuously increasing burden for the driver. In order to support this task, the existing on-board systems in vehicles primarily display visual messages, forcing drivers to move their eyes from the road. This paper presents a survey of studies related to perception and cognitive attention of drivers when this information is presented on the windshield (Head-Up Displays). Past research has suggested that this technology is considered as a possible solution for reducing the time and frequency of drivers moving their eyes of traffic. However, this technology brings its own challenges that are discussed in this paper. Augmented Reality concept is also presented because this solution adds new challenges to the technology as the risk of occlusion of real objects that are relevant to the traffic as well as phenomena like perception tunneling and cognitive capture.
The segment of public passenger transport is a part of the everyday activities of the population. His task is to ensuring for the population commuting to work, at free time activity, shopping etc. The passengers must sometimes during of transport process to change of transport mode. The change is carried in the traffic hub, where the passenger can change the means of transport of the same transport mode or different transport modes. It is important to ensure continuity of public transport in the traffic hub. The current situation in the field of solving the problem has lack, not yet been to developed a complex assessment methodology. In practice this means, that all transfer times between different modes of transport are set from estimations coordinators integrated transport system. The changes of transfer times are performed operatively. In the contribution is set a new methodology of continuity public passenger transport in traffic hub.
In the process of operation, there are changes in the injector with hydro-electromagnetic control of the nozzle needle. These changes are due to a wear on all components of the fuel system. Essential to the wear rate of the nozzle elements, excluding the clearing degree of the fuel and the extent of its cleaning prior to entering the high-pressure system of fuel system, are the operating pressure of the fuel, the number of sprays, the thermal load, the speed and the accelerations of the movable elements. The valve wear on the control valve changes the stroke of the ball valve. This variation results in an increase in the output flow from the control chamber, which increases the speed and the maximum stroke of the control piston and the flow fuel rate respectively. The ball valve stroke increasing respectively increases the distance between the core of the electromagnet and the coil. The increased distance between the coil and the core also has a significant effect on the hydraulic characteristics of the nozzle.