computer modelling
There is always the possibility of modelling a complete engine, but in my experience in another field total modelling is not always helpful and indeed can be misleading. I found computer models to be very helpful when applied in smaller ways that permitted understanding of the results, in the same way that simple maths provides a better understanding than a complete math model. The models are always to some extent idealised and I doubt whether vibrations could be effectively modelled because there are so many random elements to include. And random is difficult for computers because they suppose that random is actually random whereas in reality it is not, a Monte Carlo type programme is drastically over-pessimistic when compared with other engineering techniques such as rss, which allows for the statistical improbability of everything being on the very worst limit in any one product.
With apologies for uk english spelling.