An Elastohydrodynamic Coupling of a Rotating Crankshaft and a Flexible Engine Block
Author:
Ebrat Omidreza1, Mourelatos Zissimos P.2, Hu Kexin3, Vlahopoulos Nickolas4, Vaidyanathan Kumar1
Affiliation:
1. Federal-Mogul Technical Center, 47001 Port St., Plymouth, MI 48170 2. Mechanical Engineering Department, Oakland University, Rochester, MI 48309 3. Metaldyne Corporation, 47603 Halyard Drive, Plymouth, MI 48170 4. Department of Naval Architecture & Marine Engineering, University of Michigan, Ann Arbor, MI 48109
Abstract
A comprehensive formulation is presented for the dynamics of a rotating flexible crankshaft coupled with the dynamics of an engine block through a finite difference elastohydrodynamic main bearing lubrication algorithm. The coupling is based on detailed equilibrium conditions at the bearings. The component mode synthesis is employed for modeling the crankshaft and block dynamic behavior. A specialized algorithm for coupling the rigid and flexible body dynamics of the crankshaft within the framework of the component mode synthesis has been developed. A finite difference lubrication algorithm is used for computing the oil film elastohydrodynamic characteristics. A computationally accurate and efficient mapping algorithm has been developed for transferring information between a high-density computational grid for the elastohydrodynamic bearing solver and a low-density structural grid utilized in computing the crankshaft and block structural dynamic response. The new computational capability is used to compute the vibratory response of an automotive V6 engine due to combustion and inertia loading.
Publisher
ASME International
Subject
Surfaces, Coatings and Films,Surfaces and Interfaces,Mechanical Engineering,Mechanics of Materials
Reference32 articles.
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