Title: Including deformation in a model for engine block dynamics: measurement and prediction of vibration
Authors: Pär Mikaelsson; Tommy Andersson; Mårten Olsson
Addresses: Bus Development, Scania CV AB, Scania Technical Centre, SE-151 38 Södertälje, Sweden ' Engine Development, Scania CV AB, Scania Technical Centre, SE-151 38 Södertälje, Sweden ' Solid Mechanics, KTH – Royal Institute of Technology, SE-100 44 Stockholm, Sweden
Abstract: Internal combustion engines (ICE) are sources of vibration in many applications. Engine mounted components need to be designed with respect to fatigue, to withstand these vibrations. In order to compute an estimate of the fatigue life of a component, the vibration load needs to be known. A methodology that is based on a seven degree of freedom model to represent the engine block is proposed. By fitting measured accelerometer data to this model, acceleration levels in arbitrary positions and directions, related to the engine block, may be computed. Results presented for an engine vibration measurement show good agreement between measured and computed vibration levels. A measure to find erroneous accelerometer definitions is also proposed and exemplified through measurement results. The method also enables pointing out local dynamic phenomena at measurement points.
Keywords: engine; engine block vibrations; engine block twist; rigid body vibrations; vibration measurement; vibration estimation.
International Journal of Heavy Vehicle Systems, 2019 Vol.26 No.1, pp.55 - 68
Accepted: 12 Mar 2017
Published online: 20 Dec 2018 *