• Energy Research
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A schematic diagram of a transport hybrid power plant using a new design RPE-4.4/1.75 rotary piston air engine is proposed. Its external speed characteristic is determined, according to which the maximum engine power is 8.75 kW at 850 rpm and the maximum torque is 127.54 N∙m at 400 rpm. For various gears and speeds, all the components of the power balance were determined and the dynamic characteristic of the hybrid car was obtained when operated on an air engine. According to the dependences of the power balance, the total traction force from the rotary piston air engine on the driving wheels is 5 kN. The performance of acceleration of a hybrid car while working on an air engine is estimated, namely, the dependences of acceleration, time,and acceleration path are obtained. In urban traffic, the required time to accelerate the car to a speed of 60 km/h is 15.2 s and the path is 173 m. The possible drive range of the hybrid car on compressed air without additional recharging is analyzed. On one cylinder with compressed air with a volume of 100 liters, an initial pressure of 35 MPa, and a final pressure of 2 MPa, the hybrid car can travel about 26 km.

A schematic diagram of a transport hybrid power plant using a new design RPE-4.4/1.75 rotary piston air engine is proposed. Its external speed characteristic is determined, according to which the maximum engine power is 8.75 kW at 850 rpm and the maximum torque is 127.54 N∙m at 400 rpm. For various gears and speeds, all the components of the power balance were determined and the dynamic characteristic of the hybrid car was obtained when operated on an air engine. According to the dependences of the power balance, the total traction force from the rotary piston air engine on the driving wheels is 5 kN. The performance of acceleration of a hybrid car while working on an air engine is estimated, namely, the dependences of acceleration, time,and acceleration path are obtained. In urban traffic, the required time to accelerate the car to a speed of 60 km/h is 15.2 s and the path is 173 m. The possible drive range of the hybrid car on compressed air without additional recharging is analyzed. On one cylinder with compressed air with a volume of 100 liters, an initial pressure of 35 MPa, and a final pressure of 2 MPa, the hybrid car can travel about 26 km.

The main goal of the research is to determine and analyze the criteria for the formation of electricity prices for generating enterprises using a systemic approach to evaluate the impact of the set specified criteria as a holistic system. An analysis of the influence of exchange, regulatory, technical and technological and other criteria and factors on price formation for energy industry enterprises was carried out. It is indicated that the offer of prices for electric energy on the stock exchange is formed by three components: marginal costs, "no-load" costs and "loading" costs. It is established that the opportunity given to the consumer to influence the price of electricity independently is an important criterion for the formation of the price of electricity in the conditions of market liberalisation, and the mechanism of implementation of this criterion is detailed. The existence of both a positive and a negative impact of excessive market regulation by the introduction of the procedure "imposing special obligation" on energy industry enterprises is indicated. The main factors influencing the "cost of the supplier's services" criterion are established and analyzed. The conclusion that the criteria for the formation of the electricity price should represent a coordinated system that realizes the principle of compatibility of incentives for all parties that form a balance of interests - both producers and consumers is a scientific novelty. In addition to the principle of the compatibility of incentives, other principles which must be met by the criteria for the formation of the electricity price were also named for the first time. In order to introduce a systematic approach to analysis, a model of electricity price formation in conditions of market liberalization has been proposed for the first time. The advantage of this model lies in the fact that it allows not only for assessing the impact of the identified criteria on the electricity price but also to forecast this price for future periods.

The main goal of the research is to determine and analyze the criteria for the formation of electricity prices for generating enterprises using a systemic approach to evaluate the impact of the set specified criteria as a holistic system. An analysis of the influence of exchange, regulatory, technical and technological and other criteria and factors on price formation for energy industry enterprises was carried out. It is indicated that the offer of prices for electric energy on the stock exchange is formed by three components: marginal costs, "no-load" costs and "loading" costs. It is established that the opportunity given to the consumer to influence the price of electricity independently is an important criterion for the formation of the price of electricity in the conditions of market liberalisation, and the mechanism of implementation of this criterion is detailed. The existence of both a positive and a negative impact of excessive market regulation by the introduction of the procedure "imposing special obligation" on energy industry enterprises is indicated. The main factors influencing the "cost of the supplier's services" criterion are established and analyzed. The conclusion that the criteria for the formation of the electricity price should represent a coordinated system that realizes the principle of compatibility of incentives for all parties that form a balance of interests - both producers and consumers is a scientific novelty. In addition to the principle of the compatibility of incentives, other principles which must be met by the criteria for the formation of the electricity price were also named for the first time. In order to introduce a systematic approach to analysis, a model of electricity price formation in conditions of market liberalization has been proposed for the first time. The advantage of this model lies in the fact that it allows not only for assessing the impact of the identified criteria on the electricity price but also to forecast this price for future periods.

Abstract. Engineering management of the technical condition of combine harvesters is mainly entrusted to the combine operator or service team, for which the greatest difficulty is related to information and intellectual aspects, which determine the high requirements for operator qualification, to the level of technical diagnostic tools. The solution of manually littlestudied and complex problems of technical diagnostics of combine harvesters encounters natural difficulties associated with the need for heuristic processing of large amounts of information and logical analysis of complex interconnected processes. The value of these factors is exacerbated by the rapidity of the harvesting process, the high risk of erroneous or delayed assessment of the technical condition of the combine, which leads to significant crop losses and does not allow to obtain a possible effect. Thus, ensuring high quality maintenance of the combine harvester largely depends on the professional competence of staff, which is a deep knowledge of the design of the machine and its subsystems: mechanical systems, hydraulics, electrical equipment.