Abstract
This paper is concerned with the use of ‘loop analysis’ in the evaluation and validation of dynamic simulation models. The part that loop analysis plays in the overall validation process is described, and it is shown, by reference to the analysis of a complex model, how the model's behaviour may be investigated. The analysis proceeds by identifying some of the elements of system behaviour such as damping, phase-shifts and gain/delay factors, and, in the process, highlights those feedback loops that are pseudo-positive and/or unconformable. In addition to the validation aspect of the use of loop analysis, there is a valuable contribution towards the knowledge and insight of the model-builder, enabling him better to identify areas of the system which may benefit from re-design.
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