A computer package MEDIEM (Multi-Energy-Domain-Interactive-Element-Modelling) has been developed for the purpose of interactive modelling of multi-energy domain systems. Model entry is effected interactively, using a mouse, by drawing a 'structure graph' from a set of defined elements in a fixed menu display. This allows rapid and efficient model development from which time and/or frequency-response information can be displayed. The package can be applied to mechanical, electrical, thermal and fluid systems (inclusive of energy conversion) provided that they can be treated on a lumped parameter basis. The paper illustrates the features of MEDIEM by way of simple examples covering electrical circuits, hydraulically coupled tanks, a vehicle suspension system, an electro-mechanical vibrator and two feedback control systems.
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