This work solves the task of developing a fuzzy logic model for evaluating the energy efficiency of vehicles as part of the control unit of an intelligent transport system. Within the scope of this ...study, the previously obtained morphological model of the transport system was modified. A mathematical dependence is proposed to determine the vehicle energy efficiency indicator. This dependence characterizes the energy consumption of the vehicle in relation to the energy consumption of the vehicle under the reference operating conditions. Synthesis of system configurations was performed, and procedures were used to transform the morphological formulas of the received configurations into a base of logical derivation rules. Parameters of the membership functions of system parameters to fuzzy terms of the area of their definition are defined. Based on the results of the morphological analysis, two fuzzy derivation models were developed: the Mamdani type and the Sugeno type. The accuracy of the modeling was evaluated using different defuzzification algorithms in the control sample. The most accurate model is the fuzzy Mamdani model, with an accuracy value of 98.8%. Using the developed model, the nature of the mutual influence of the transport system parameters on the level of vehicle efficiency was assessed. The results of the study can be used to justify the choice of the vehicle under the specified operating conditions and in the settlement design of the road infrastructure.
The paper studies the problem of assessing the vehicle energy efficiency on the streets of urban road network. As a result of morphological analysis of the system “Vehicle—Traffic flow—Road—Traffic ...Environment” 18 significant morphological attributes of its functional elements, that affect the energy efficiency of vehicles, were identified. Each attribute is characterized by 3–6 implementation variants, which are evaluated by the relevant quantitative or qualitative parameters. The energy efficiency of vehicles is determined by the criteria of their energy consumption considering the vehicle category, type of energy unit, mode of vehicle movement and adjustment factors—road, climatic and others. The input parameters values of the system in the process of traffic flow on the linear fragments of streets and road networks of the cities of Ukraine and Poland were measured. The set of independent system parameters is determined by applying the Farrar-Glober method based on statistical estimates. The specified set is the basis of the studied system and is formed of 10 independent input parameters. The presence in the basis of parameters that correspond to the morphological features of all four functional elements, confirmed the importance of these elements of the system. The mathematical dependence of the impact of vehicle characteristics, traffic flow, road and environment on vehicle energy efficiency is built. The standard deviation of the model values from the tabular ones equals σ´=0.0091. Relative standard deviation equals S´r=1.5%. The results of the study could be used in the development of new and optimization of existing intelligent traffic control systems of urban transport.
After the study of the expert points quality work regarding the comprehensive research of vehicles, the main group of parameters which reflect the organizational structure of expert institutions was ...identified and an algorithm for their monitoring was developed. The parameters of an expert institution are the provision of divisions with personnel ( ), necessary areas ( ), necessary documents ( ), equipment and supplies ( ), metrological equipment ( ), material and chemical resources ( ), completeness of the organization of structural divisions of the expert service ( ), constant self-assessment of the performed services for the expert examination of vehicles ( ) and adjustment of their performance, which reflects the parameter of the quality of the expert examination ( ). As a result of conducting an analysis of expert vehicle research service functioning according to the proposed algorithm, it becomes possible to identify the shortcomings of the organization of this type of enterprise, as a result of which improvements can be made to increase the efficiency of its functioning. Therefore, the result of the investigation is a system of parameters, the consistent evaluation of which in accordance with the developed algorithm for the implementation of control over expert research will make it possible to assess the effectiveness of the expert service functioning in general. It was found that this system of parameters meets the criteria of necessity and sufficiency for assessing the state of the enterprise from expert research. A set of universal indicators based on technical regulation was developed, which allow to assess the state of the expert institution through the conduct of expert studies. The proposed method of evaluating expert institutes provides an opportunity to improve the organizational and technological structure of this type of enterprises.
The efficiency of the public transport use is a complex indicator formed from a set of partial assessments of its economic, technical and environmental efficiency. Special attention must be paid to ...the evaluation of efficiency based on energy consumption, taking into account transport work on the city route. The article is devoted to study of the operation performance of a diesel city bus on the selected city route and determines its energy efficiency by specific fuel consumption per unit of transport work. Based on statistical data, the distribution patterns of the speed and acceleration of the bus on the studied route were determined. The analytical dependence of the specific fuel consumption on the average daily passenger flow capacity on the route is obtained and its adequacy is confirmed. Using the dependence obtained, the fuel consumption of the bus was estimated in individual hauls and a certain section of the route.
The article explores the possibility of optimization of the public transport network by reducing the number of duplicate routes. In the course of the research the existing network of urban passenger ...transport of Cherkasy and the structure of the transport fleet of motor transport enterprises providing relevant services are analyzed. The length of the different routes of the network and the intensity of their movement are determined. It has been found that the density of the public passenger transport route network (8.1 km/km2) is much higher than the normative value. The indices of duplication of each bus and trolleybus route of the network with other routes are calculated. In order to study the demand for urban passenger transportation, a population survey was conducted. A mathematical model for optimizing the movement of trolleybuses and buses on duplicate routes is constructed. The model takes into account the degree of duplication of one route by another, the percentage distribution of passengers by type of transport and the limitation of vehicles by passenger capacity. The values of the model parameters, which determine the damage to the urban environment by one run, are calculated at the tariff rates for damage to the vehicle 1 km of the city road and the emission into the atmosphere of the exhaust gas (for buses). Optimization of the Cherkasy public transport network on routes with complete duplication (coincidence of route routes of two modes of transport is not less than 75%). According to the optimization results, a new itinerary network is proposed, which provides minimal duplication of routes, which in turn will lead to reduction of the accident rate, reduction of environmental pollution and increase of the efficiency of operation of the entire transport infrastructure of the city. The implementation of the results of this study will reduce the overall economic and environmental losses of passengers and transport, which will lead to a more efficient functioning of urban transport. The constructed model can be used to plan urban traffic on new routes, as well as to construct a dual task of calculating the cost of passenger hours, provided that passenger traffic is moving with optimum intensity.
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