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Theoretical methods for the studying static and dynamic behaviour of , e.g. differential equations, Nyquist plots, frequency response , root locus as well as digital or analogue simulation.

Feature that on some adjusting features on pumps, e.g. power controllers, reduces or limits the pump delivery flow on reaching an upper adjustable pressure to prevent the pressure-limiting valve trigg

Describing function is the term used on non-linear transfer elements for the frequency response while only taking into account the fundamental oscillation of the , recorded or calculated for various c

Is used to stabilise closed circuit position control systems and together with velocity feedback has an optimal action in these circuits. On poorly damped drives (such as hydraulic drives) acceleratio

Is undertaken using sensors that determine the acceleration of an element of a machine. This measurement is made using either seismic (inductive) sensors (Figure B 12) or using force sensors based on

Ability of a hydraulic fluid to cover the surface over which it is distributed to a greater or lesser degree. Hydraulic fluids with good wetting ability adhere better to the surface. As a consequence

Filter on the hydraulic fluid tank that filters the air flowing in as the pump draws fluid to prevent contamination by this route. Its filtration grade should correspond to that of the oil filter.

They represent characteristic operating pressure-time curves for cylinders and make it easier to categorise cylinders with widely varying requirement profiles in relation to their load. Five basic loa

The steady state of an element is the state to be maintained for a period as long as necessary that results from input signals that are constant over time, after all settling processes have ended (DIN

Vessel for collecting and to some extent conditioning hydraulic fluid (removal of contamination and air, quietening). Is used at the same time to remove dissipated heat , however it is only suitable f