The object of the invention is a device (16) of the deceleration is active for a carriage (18) which supports at least one specimen (20) has been started at a speed v0 is not zero for the production of a test according to a law of deceleration given, in particular in the context of a simulation of an accident or an impact of a vehicle or aircraft, said device (16) of the active agent comprising at least one braking device is mounted and working in opposition to the movement of carriage (18) has been started to vo, the braking device being controlled by control means (24), characterized in that said braking device is a ram (22) entering directly in contact with the carriage (18) for the brake according to the law of deceleration given.
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