ABSTRACT
The chapter provides the fundamentals of modelling and simulation of complex engineered systems. A model is a surrogate for the real system and represents its characteristics and attributes in experimental studies. Modelling process is a constructive activity whose goal is to build a sufficiently good model. The chapter presents the algorithm of the entire modelling and simulation process and discusses all its steps. Then the process of creating mathematical models divided into seven stages is demonstrated. The basic advantages and disadvantages of the modelling and simulation process were analysed. The second part of the chapter was devoted to development and application of the modelling and simulation process. The lifecycle of a modelling and simulation process was presented and analysed. The relationships between the conceptual model, the working model and the real complex engineered system was discussed. The eight key factors contained in the examination of results credibility were demonstrated and analysed. The chapter concludes with an analysis of the risks associated with uncertainty regarding the credibility of modelling and simulation results, as well as criteria for deciding whether to accept or reject these results.
