The paper presents a detailed engine modelling method, referred to as a multi-physics approach, in which combined rigid body inertial dynamics, structural modal characteristics of elastic components and tribological behaviour of load bearing surfaces can be studied within a single analysis. This approach is regarded as holistic and a good aid for detailed design. Of particular interest is the evaluation of behaviour of critical elements in the system, such as the load bearing conjunctions (e.g. crankshaft engine bearings). Another important feature is the inclusion of study of motion across the physics of scale, from micro-scale fluid film formation in bearings to sub-millimetre structural deformation of components and large displacement inertial dynamics. In order to arrive at predictions within sensible industrial time scales, it is essential to include, as far as possible, modelling features of analytical rather than numerical nature, which necessitates inclusion of some simplifying assumptions. When such an undertaking is made, the validity of model predictions must be gauged against experimental findings to enhance confidence in the use of the method. The paper shows good conformance between model predictions and experimental investigations. It further shows that some important issues in engine design and development can be addressed in a satisfactory manner, paving the way for reduction in the empirical or iterative nature of engine design evaluation.

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