Table of Contents

  • TRANSPORT TECHNICS. INVESTIGATION OF ELEMENTS. RELIABILITY

    • DEVELOPMENT OF MODEL OF WHEEL SLIPPAGE SELF-PROPELLED VEHICLES ON BENDS

      pg(s) 102-103

      Patency and safety of self-propelled wheeled machine are complex indicators of its quality, which will depend on the performance of its properties and performance of road conditions. When assessing the passability and safety of self-propelled machines, the issues of redistribution of tractive forces (or slippage) on their wheels when moving along a curve are practically not considered. The machine is a one-piece structure, considering only the greatest load when assessing the movement of machines on the ground and on a paved road on a turn is not sufficient. Therefore, when assessing the complex indicators of the quality of patency and machine safety, it becomes necessary to take into account also the redistribution of their skidding. Controllability and rotatability, are characterized by kinematic (trajectory, turning radius, etc.) and power (torque on driving wheels, reactions, etc.) parameters.

    • SCIENTIFIC SUBSTANTIATION OF IMPROVED METHOD OF THE DIAGNOSIS OF HYDRAULIC DRIVES USED ON COMBINE HARVESTERS

      pg(s) 104-106

      Maintaining of the combine harvesters in an efficient condition throughout the harvest season is an important task of technical service. The most important elements in the work of combine harvesters are their steering mechanisms, the performance of which must have a high degree of availability, especially of their hydraulic drives. The purpose of this study is to increase the operational reliability of the steering drives of the combine harvesters, based on the development of an improved method for diagnosing of their hydraulic drives. During the research, the methods of theoretical and experimental research were used, based on the theory of machine operation, hydraulics, as well as modern methods of experimental studies of hydraulic equipment. The data of the experimental studies were processed by statistical methods using a PC. Theoretically and experimentally, an improved method for diagnosing of the hydraulic drives has been developed with the aim to increase the technical readiness of combine harvesters and reduce the costs of their maintenance and repair. A new methodical approach and results of studies on the creation of a diagnostic system for the hydraulic drive of the combine harvester’s power steering have been developed.

  • TRANSPORT. SAFETY AND ECOLOGY. LOGISTICS AND MANAGEMENT

    • BEARING CONSTRUCTION OF PASSENGER’S SEAT, AND THE ACCT/AFFECT OF THE SAFE AREA DURING THE BUS’S ACCIDENT

      pg(s) 107-109

      This paper investigations detail analysis of the influence the type of construction and the way of fixing seat bearers on basic bus construction and its superstructure. Before performing experimental investigations it was modeling of tension-deformation condition of across frame made by using Finite Element Methods. During experimental investigations on basis of this analysis it was founded three measuring points where deformations were measuring. According results from experimental investigations it was third type of seat bearers allowing raise of safety area of bus passenger’s.

    • THE IMPORTANCE OF SOCIAL RESPONSIBILITY IN THE PREFERENCE OF PORT OPERATIONS BY INTERNATIONAL COMMERCE COMPANIES – A STUDY IN KOCAELİ AREA / TURKEY

      pg(s) 110-111

      Port operators are logistics companies. When we look at port management in Turkey today; competition among these operators seems to be intensifying. Therefore, this competition is pushing the port operators for differentiate their services. In this context, it can be said that one of the strategies that will differentiate port operators is the sense of social responsibility. The aim of this research is to determine how effective the port management’s social responsibility understanding is among the factors that international commerce companies operating in Kocaeli / Turkey prefer to operate a port. For this purpose, a questionnaire was applied to 32 international commerce companies operating in the Kocaeli Region and according to the survey results, it was seen that social responsibility concept took the fourth place after the shortest time of cargo handling, the lowest cost of cargo handling and the undamaged and without any losses of cargo handling. According to this result, it is suggested that port operators should emphasize social responsibility concept more than other factors and emphasize social responsibility more in promotion activities.

    • MARKETING AND PRODUCT DEVELOPMENT IN THE AUTOMOTIVE INDUSTRY GLOBALLY

      pg(s) 112-116

      Many social, economical and technological trends begin to work together in order to transform the mobility and to create new urban models for the next decades. The trends coming from the technology development will revolutionize the way the automoyive industry responds to the changing consumer behavior. Bulding new partnerships will lead to trabsformational change. The connectivity and the automation will fundamentally change the automotive industry. The expected operational ecosystems include e-hailing mobile applications for shared electric vehicle, infotainment services and personalization inside the autonomous vehicles, connectivity to the infrastructure and provision of various services due to the Internet of Things, which will grant safe, sustainable and reliable transit.

    • DEVELOPMENT OF LOGISTIC MODEL AS AN INNOVATION FOR DESIRED QUALITY OF SERVICE

      pg(s) 117-119

      Each society makes everyday trials for improved management with communal waste. Each innovation that offers enlarged quality represents possibility for future improved strategy. Imperative of every man today is healthy living environment and maximally healthy way of living. Therefore in this paper one quite different concept will be represented – solution of the problems that the communal waste could create. If it is known that this phenomenon is inevitability and there is no possibility that no men could be exempted from the need to create a communal waste then this be solved upgraded and improved. The best and most suitable is every solution to be supported with a model. Here as a model is the desired quality of the service with completely justified scientific maintainability would be the presented logistic model – LMMCW about management with the communal waste and the possibility for qualitative and maintainable development with distinguished contributions for the people.

    • STATUS AND PERSPECTIVES OF PORT COMMUNITY SYSTEMS DEVELOPMENT IN THE EUROPEAN UNION: THE CASE OF BULGARIAN BLACK SEA PORTS

      pg(s) 120-123

      The present paper analyses the status and current issues of port information exchange systems in the European Union and the Bulgarian Black Sea ports. Port Community Systems (PCS), being a complement to the Maritime Single Windows (MSW), are based on specific EU legislation thus achieving realization of documentary data exchange in maritime transportation through a single interface with various levels of access. The main objective of this paper is to outline the feasibility, the benefits of PCS development and integration within the European Union as well as the role of the developed MSW system of Bulgarian Black Sea ports for the PCS integration environment. The PCS integration process aims at decreasing of administrative burden, reduction of documentary errors, introduction of standardized electronic data interchange and reduction of service time for port users.

  • VEHICLE ENGINES. APPLICATION OF FUELS TYPES. EFFICIENCY

    • MONITORING OF CHANGE IN VOLUMES FOR DIESEL ENGINE IN-CYLINDER PROCESS WITH QUASI-DIMENSIONAL NUMERICAL MODEL

      pg(s) 124-127

      Distribution of volumes and their change in the diesel engine cylinder is an essential parameter of each numerical model. Quasidimensional numerical model divide space inside the engine cylinder into two main areas: fuel spray packages and a large surrounding area without combustion, which is used for air distribution into the fuel spray packages. This paper analyzes the four-stroke diesel engine for thelight truck drive in several operating modes. Numerical model is validated by using laboratory measurements. In a selected engine operating mode are presented the results of a numerical model for the observed volumes inside the engine cylinder. The observed volume change provides insight into the details of the air-fuel mixing process and fuel evaporation. Described changes are the basis for the calculation of heat-release and pressure changes in the cylinder. The developed numerical model provides insight into the details of the process inside the engine cylinder which cannot be measured with standard measuring equipment.

    • RECONSTRUCTION OF INTERNAL COMBUSTION ENGINES TO RUN ON BIOGAS

      pg(s) 128-131

      Environmental pollution should be understood as a permanent process caused mostly by anthropogenic factors, that is man. The products of combustion from internal combustion engines are toxic and harmful effects on humans and the environment. This is one reason for research of biogas as an alternative fuel and its benefits for smaller amounts of harmful products in its combustion. For this purpose is reconstructed diesel engine that runs with a mixed fuel diesel- biogas where diesel fuel used for combustion and biogas propulsion engine combustion. Thus it is given the overall internal construction of this type of engine. There is calculated speed characteristics of the diesel engine and the reconstructed motor biogas. Thus these diagrammatic comparisons will indicate the nature of the changes in both engines.

    • SUBSTANTIATION OF PRODUCTION BIODIESEL AND ORGANIC BIOFUELS

      pg(s) 135-139

      There are in the article systematically finding out scientific-methodological and organizational-economical foundations of the development of biofuel market, forming of energy crops market, which used as plant origin bioraw material and economical estimation of their usage in the area of agro-industrial complex. World trends of development of biofuel from plant origin bioraw material were generalized, theoretical- methodological bases of forming biofuel market and its social-economic meaning in development of agro-industrial complex and economy integrally, other problems of organization of producing of bioenergy crops and competitiveness of biofuel market were examined. Prospects of development of biofuel were economically substantiated. The main problems, which restricting biofuel market are the absence of the accurate strategy of development.

  • TRANSPORT TECHNICS. INVESTIGATION OF ELEMENTS. RELIABILITY