Forming the Calculated Dynamic Transmission Systems of Wheeled Vehicles

To calculate dynamic loading of transmission parts of wheeled vehicles, it is necessary to build up the appropriate calculated dynamic systems and determine their inertial, elastic, and damping parameters.

The initial point of this process is to form an initial dynamic system. Hereafter, to cut the time of computations there is a need to reduce the number of masses of this system, and sometimes simplify its structure. The main requirement to be fulfilled in this case is that the calculated dynamical system is to be equivalent to the initial one (in terms of similarity of the vibrational process characteristics in these systems, i.e., the frequencies and modes of oscillations of both systems, their amplitude-frequency characteristics). This is possible when the energy characteristics of the corresponding systems are equal, i.e. their kinetic and potential energies, dissipative functions, and external force energies.

Usually, when forming the initial and calculated dynamic systems, all types of friction are reduced to a linearly viscous one. However, it disables us to investigate the motion of these systems if there is an arbitrary, in particular, poly-harmonic action (for example, on the side of the internal combustion engine), since in this case the linear friction coefficients given will depend on the frequency and amplitude of the oscillations.

The paper is aimed at determining the equivalent parameters of calculated dynamic systems of wheeled vehicles, including the dissipative parameters for the general case of friction.

On the basis of energy principles, the expressions are obtained to determine the equivalent inertial, elastic, and damping parameters of the calculated dynamical systems of wheeled vehicles when the structure is changed and the number of masses of the system is decreased. The presented technique enables us to investigate the motion of these systems under arbitrary, including poly-harmonic, action on the system, using the calculated or experimentally obtained friction parameters in the dynamic system components, which are independent on the frequency and the amplitude of the oscillations, rather than the reduced coefficients of linear friction.

1. Фоминых А.Б., Жеглов Л.Ф. Формирование исходных динамических систем колесных машин // Инженерный вестник. 2016. № 12. С. 73-85.

2. Руктешель О.С. Определение динамических нагрузок в трансмиссии автомобиля: учебно-методическое пособие. Минск: Изд-во Белорус. национал. техн. ун-та, 2010. 49 с.

3. Полунгян А.А., Фоминых А.Б. Методы учета рассеяния энергии в механических системах при полигармонических возмущающих воздействиях // Вестник машиностроения. 1990. № 6. С. 12-16.

4. Ривин Е.И. Динамика приводов станков. М.: Машиностроение, 1966. 203 с.

5. Полунгян А.А., Бурумкулов Ф.Х., Фоминых А.Б., Кондрашкин С.И. К вопросу о выборе числа степеней свободы расчетной динамической системы трансмиссии многоприводной колесной машины // Известия ВУЗов. Сер. Машиностроение. 1969. № 11. С. 165 – 170.

6. Даштиев И.З., Полунгян А.А., Афанасьев Б.А., Фоминых А.Б., Жеглов Л.Ф. Исследование демпфирования в упругих элементах на основе полимерных композиционных материалов // Вопросы оборонной техники. Сер. 15: Композиционные неметаллические материалы в машиностроении. 2002. Вып.1(127) - 2(128). С. 69-72.