Investigation of the vibration causes in transitional modes of vehicle driving

In the article the authors consider the vibration process, which occurs when the vehicle mechanical transmission is switched on. Oscillations arising at idle speed of the vehicle and associated with an engine bearing system defect or its gear knocking are not considered in this article. Vibrations that appear during the slipping of friction discs have been investigated. This phenomenon, known in the automotive industry as a “jerk” of the clutch, determines both the durability of the vehicle and its comfortability. Two reasons to cause the vibrations in transient operating modes were determined. One of the reasons was the self-oscillations of the friction discs caused by the change in the friction coefficient depending on the sliding speed. As an example, a model of a mechanical system describing the causes of arising oscillatory processes was considered, and recommendations for their elimination were given. The second reason for the occurrence of clutch “jerks” was accounted for by the deviations in the geometric dimensions of the structural elements. The narrowing of production tolerances of parts and the control of accuracy during assembly made it possible to reduce the likelihood of oscillations. However, the best technical solution should be found at the early stages of the vehicle design, since the separate optimizing of the coupling design would not result in a technically and economically feasible effect. The task to reduce the vibration load on the vehicle requires a comprehensive consideration. The article also proposes the scheme of the vehicle dynamic system. The development of the model will allow to determine the natural frequencies of the system, to reveal the resonance modes of operation and to find the maximum amplitude of the inertial masses oscillations, thereby reducing the time, labor and materials costs to carry out a large amount of full-scale experimental and finishing work at the design development stage. The result of the research is the developed recommendations necessary for predicting and ensuring the vibration resistance of the vehicle against the “jerk” of the clutch.

motor vehicle, transmission, clutch, friction lining, vibration loading, gradient of friction coefficient

1. Полунгян А.А., Фоминых А.Б. Динамика колёсных машин. Ч. I: Учебное пособие / Под ред. А.А. Полунгяна. - М.: Изд-во МГТУ, 1995. - 88 с., ил.

2. Mancher P Kupplungsrupfen, Möglichkeiten zur Vermeidung. - LuK-Kolloquium. - 1990. - P. 103-117.

3. William C. Orthwein. Cluthches and Brakes. Design and Selection. 2nd Edition. - New York, Basel: Marcel Dekker, Inc., 2004. - 351 p.

4. Косов В.П. Проектирование гидромеханических передач транспортных машин. Часть 2. Фрикционные устройства ГМП: Учеб. пособие. - Курган: Изд-во Курганского гос. ун-та, 1998. - 103 с.

5. Зельцерман И.М., Каминский Д.М., Онопко A.Д. Фрикционные муфты и тормоза гусеничных машин. -М.: Машиностроение, 1965. - С. 8-10.

6. Albers A., Krüger A., Lux R., Albrecht M. Prüfen von Antriebssträngen am Beispiel des Kupplungsrupfens -Ganzheitliche Antriebsstrangentwicklung. - ATZ -Automobiltechnische Zeitschrift, January 2001, Volume 103, Issue 1, pp. 44-49.

7. Вибрации в технике: Справочник в 6-ти т. / Ред. В.Н. Челомей (пред). - М.: Машиностроение, 1980. -Т.3. Колебания машин, конструкций и их элементов / Под ред. Ф.М. Диментберга и К.С. Колесникова, 1980. - 544 с., ил.

8. Лихачёв Д.С., Тараторкин И.А., Харитонов С.А. Особенности динамической нагруженности трансмиссии транспортного средства с комбинированной энергоустановкой // Труды НАМИ. - 2016. - № 4 (267). - С. 22-31.

9. Лихачёв Д.С., Батизи В.М. Оптимизация уровня вибронагруженности на переходных режимах движения автомобиля / Приоритетные задачи и стратегии развития технических наук: Сб. науч. тр. по итогам международной научно-практической конференции. -Тольятти, 2017. - № 2. - С. 31-36.