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Classical Engine Design Calculations Using Spreadsheets. A.C.Erskine, R.Ali, G.G.Lucas, A.Hughes. Classical methods of design and analysis of engine components are in danger of fragmentation and falling into disuse because of their ad hoc development and lack of continuity of personnel. It is argued that although advanced and comprehensive numerical methods of analysis have recently become available to engine designers, classical techniques still have a useful role to play in the design office. To retain their continual use and to enhance it, it is necessary to translate and integrate the existing classical techniques into user friendly computer software. This has been achieved in a software package, CEDS, discussed in this paper. The software is quick and easy to use allowing rapid parametric studies in the early stages of design of components.

The study presented in this paper is concerned with the application of a finite element based technique to deal with crankshaft-crankcase interaction. A finite element model of the crankshaft and the crankcase was developed and appropriately reduced. This model was used for a crankshaft optimization, strategy to analyse related effects on the NVH performance with focus on main bearing acceleration. The crankshaft and the cylinder block were modelled using beam and shell elements with structural and dynamic properties correlated up to 1600 Hz. The interaction between crankshaft and the cylinder block was represented by using non-linear properties. Applying this model, the dynamic crankshaft and engine block behaviour and repercussion on NVH performance was analysed by investigating main bearing acceleration.

Computerisation of Classical Engine Design Techniques using Spreadsheets. A.C.Erskine, R.Ali, G.G.Lucas, A.Hughes. Traditionally, engine components have been analysed using models with sufficient simplification to enable solutions to be calculated by hand. With the increasing availability of powerful computers these ‘classical’ techniques are being forgotten in favour of more accurate, but more complex and time consuming, finite element methods. This paper discusses the benefits of using classical analysis techniques and describes a user-friendly, spreadsheet based system for their application. The Classical Engine Design System (CEDS) is quick and simple to use making parametric studies in the early design stages easy. These can be used to evaluate the feasibility of a design in order to justify time and money spend on further, more detailed analysis. Microsoft's Excel spreadsheet package, running on a P.C., has been used as a basis for the software.