In the previous chapter complex thermodynamic modelling was introduced. It was highlighted that the complexity of these models results in a high computational burden. It was then shown how simpler models can be derived from this complex model that represent the key dynamics of the engine suitable for control system development. The chapter ended with the development of linear dynamic models. These allow performance at steady-state operating points to be considered and controller stability to be assessed for certification. However, the engine dynamics are known to be nonlinear. A limitation of linear models is that they only consider a small neighbourhood around steady-state conditions. In order to assess transient performance over the operating range of the engine, another form of model is required. Full thermodynamic nonlinear models tend to be too complicated for “real-time” calculations, although they are the most exact. Linear models are computationally faster, but can only be used over a narrow range of operating conditions.
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