Випуск 51

Постійне посилання зібранняhttps://dspace.khadi.kharkov.ua/handle/123456789/7978

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Determination of the average torsional stiffness of tires of a double vehicle wheel during its interaction with the road surface
(Харківський національний автомобільно-дорожній університет, 2022) Leontiev, Dmytro; Frolov, Andrii; Леонтьєв, Дмитро Миколайович; Фролов, Андрій Анатолійович
Problem. In the scientific and methodological recommendations of forensic institutions and in the scientific and technical literature there are currently no universal methods for determining the braking parameters of cargo multi-axle vehicles that have wheels with double tires, which affects the results of drawing up the conclusions of the motor-technical expertise. The lack of universal methods is due to the difficulty of determining the actual braking, especially when the tires of dual wheels interact with the road surface. Goal. The goal is justification of the method of determining the average torsional stiffness of tires of a double vehicle wheel during its interaction with the road surface. Methodology. The approaches adopted in the work to achieve the set goal are based on the theoretical foundations of the deformation of elastic elements, which are located parallel to each other. Results. Equations are determined that allow you to calculate the value of the average torsional stiffness of the tire for wheels that have double, triple or quadruple tires. Originality. The results of the research provide a general idea of the effect of the pressure in the tires of a double wheel on the value of its average torsional stiffness. Practical value. The obtained results can be recommended to expert motor technicians when drawing up a conclusion of an expertise or an expert study. Besides, the results of the study can be used in the educational process during the training of specialists in the field of transport or mechanical engineering.
On the issue of using expenditure functions in simulation of pneumatic links of the "throttle - capacity" type
(Харківський національний автомобільно-дорожній університет, 2022) Leontiev, Dmytro; Savchenko, Yevhen; Harmash, Anton; Suhomlyn, Oleksandr; Sinelnik, Danylo; Леонтьєв, Дмитро Миколайович; Савченко, Євген Лукич; Гармаш, Антон Андрійович; Сухомлин, Олександр Вячеславович; Cінельнік, Данило Богданович
Problem. When studying the work processes that occur in pneumatic or electropneumatic circuit of brake systems or pneumatic suspension systems of a wheeled vehicle, researchers use various expenditure functions on the basis of which they draw scientific conclusions and obtain scientific results, while they do not think about the fact that the functions are credible or not. The choice of the expenditure function, for researchers, is an actual scientific task, which should have a scientific justification and should not have a formalized nature. Goal. The aim of the study is to compare the expenditure functions to determine the nature of their influence on the dynamic processes that occur during filling or emptying links of the pneumatic circuit. Methodology. The approaches adopted in the work to solving the set goal are based on the analysis of the results of simulation modeling of work processes in pneumatic circuit. Results. A comparison of the research results obtained in this work with each other and with the results obtained in experimental studies, allowed us to establish the peculiarities of the course of work processes in the pneumatic circuit links when using different expenditure functions. It was established that, depending on the choice of the expenditure function, with the same initial conditions of simulation modeling, the results of the study can differ by up to 40%. Originality. The use of a universal basis of simulation modeling, based on various expenditure functions, enabled to establish that it is possible to propose new functions that better describe the working process in a pneumatic circuit than the known ones. Practical value. The obtained results can be recommended in the practice of simulation modeling of work processes in pneumatic or electropneumatic circuits of brake systems and systems of pneumatic suspension of wheeled vehicles.

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Перегляд Випуск 51 за Автор "Leontiev, Dmytro"