Publication detail
Torsional Vibration of Unconventional Crankshaft in Four-cylinder Passenger Car Engine
DRÁPAL, L. VOPAŘIL, J.
Czech title
Torsní kmitání nekonvenčního klikového hřídele čtyřválcového motoru osobního vozu
English title
Torsional Vibration of Unconventional Crankshaft in Four-cylinder Passenger Car Engine
Type
conference paper
Language
en
Original abstract
Modern internal-combustion engines have to meet demands on the overall engine efficiency which consists of particular efficiencies. The one of them is mechanical efficiency and its high value is exacted from internal-combustion engines. The reduction of friction losses of crankshaft main bearings can significantly contribute to the enhancement of this efficiency. This is the reason of development of an innovative design of a crankshaft. The potential and capabilities of computational modelling during the development of this innovative crank train is described in the paper. The dynamic computational model of the whole crank train is assembled and solved by using a Multi-Body System software, where modally reduced flexible bodies along with hydrodynamic bearings are incorporated. The paper presents the simulation results concentrated on the torsional vibration and its analysis, including concept design of a torsional damper, because a reduction of friction losses is associated with the improvement of torsional vibration in this case. On the grounds of low-costs, a rubber torsional damper is taken into account.
Czech abstract
Moderní spalovací motory musejí splňovat požadavky kladené na jejich celkovou účinnost, jež se skládá z dílčích účinností. Jednou z nich je mechanická účinnost, přičemž snížení třecích ztrát klikového hřídele může tuto účinnost významně zvýšit. To je také důvodem pro vývoj klikového hřídele inovativní konstrukce, jehož potenciál a možnosti jsou posuzovány pomocí pokročilého výpočtového modelování. Výpočtový model dynamiky klikového mechanismu je sestaven a řešen v prostředí Multi-Body System a zahrnuje modálně redukovaná pružná tělesa a výpočtový model hydrodynamiky kluzného ložiska. Příspěvek představuje výsledky simulace zaměřené zejména na problematiku torsního kmitání a koncepční návrh tlumiče torsního kmitání, poněvadž snížení třecích ztrát je v tomto případě spojeno s nárůstem torsních vibrací. Z důvodu nižších výrobních nákladů je uvažován pryžový tlumič torsního kmitání.
English abstract
Modern internal-combustion engines have to meet demands on the overall engine efficiency which consists of particular efficiencies. The one of them is mechanical efficiency and its high value is exacted from internal-combustion engines. The reduction of friction losses of crankshaft main bearings can significantly contribute to the enhancement of this efficiency. This is the reason of development of an innovative design of a crankshaft. The potential and capabilities of computational modelling during the development of this innovative crank train is described in the paper. The dynamic computational model of the whole crank train is assembled and solved by using a Multi-Body System software, where modally reduced flexible bodies along with hydrodynamic bearings are incorporated. The paper presents the simulation results concentrated on the torsional vibration and its analysis, including concept design of a torsional damper, because a reduction of friction losses is associated with the improvement of torsional vibration in this case. On the grounds of low-costs, a rubber torsional damper is taken into account.
Keywords in Czech
torsní kmitání, klikový mechanismus, klikový hřídek, Multi-Body System
Keywords in English
torsional vibration, crank train, crankshaft, Multi-Body System
Released
20.09.2017
Publisher
Kaunas University of Technology
Location
Kaunas, Lithuania
ISSN
1822-296X
Book
Transport Means 2017 – Proceedings of the 21st International Conference
Volume
2
Number
21
Pages from–to
699–703
Pages count
5
BIBTEX
@inproceedings{BUT144940,
author="Lubomír {Drápal} and Jan {Vopařil},
title="Torsional Vibration of Unconventional Crankshaft in Four-cylinder Passenger Car Engine",
booktitle="Transport Means 2017 – Proceedings of the 21st International Conference",
year="2017",
volume="2",
number="21",
month="September",
pages="699--703",
publisher="Kaunas University of Technology",
address="Kaunas, Lithuania",
issn="1822-296X"
}