The aim of this paper is to have a view of different levels of model simplifications for a simple hydraulic circuit. The bond graph is used to synthesize the simplifications and the different assumptions behind. Different models were built in order to keep continuity in model simplification. These models have the two causalities allowed for a particular physical phenomenon. It is believed that software will give access to different levels of model simplifications and the user will choose between these different levels the proper one that will answer to his question. However this proper model will only be achieved step by step using continuity in model simplification. The paper also shows that systems may include very different levels of power (pilot and main stages or thermal effects) and in such a case at least one C-, I- or R-element should be kept per power level.
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