University ULBRA, Discursive 2 (2016.1) of Physical Basic

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A hydraulic drive system is a drive or transmission system that uses pressurized hydraulic fluid to power hydraulic machinery. The term hydrostatic refers to the transfer of energy from flow and pressure, not from the kinetic energy of the flow.

The hydraulic fluid can be any fluid as oil or water, in specific cases can be used air or other inert gas, this case is setting up a pneumatic drive system and is necessary a compressor because gases in ambient pressure has low potential to transmission energy.

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