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A load-sensing hydraulic system is an energy-saving fluid power transmission that supplies "on-demand" flow at a prescribed pressure margin greater than load pressure. In the paper, based on bond graph methodology, a complex and non-linear load-lensing (LS) hydraulic system model is constructed, in which the dynamic behaviours of an LS valve are taken into account. Moreover, a series of experiments are performed to validate the model. Two reduced models based on activity index analysis aredoi:10.5545/sv-jme.2016.3450 fatcat:rzqvoctpp5cjdjkfxer24vgbxi