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Velocity error

Refers to the frequency of a coupled system, in which the external periodic excitation in the system brings about the maximum amplitudes, i.e. where the exciter amplitude is most amplified.

Moving parts of devices are fixed in one or more positions by a detent and can be moved to another position given an increased shifting force.

Allows moving to a certain point on the level, without needing to define a functional relationship along the movement path in the individual path axes. The movements may be performed simultaneously or

Fluid level height above an inlet or outlet opening. In the case of a negative inlet height, the suction pressure for pumps is lower than the ambient pressure (Figure Z 8).

Transient response of a hydraulic motor during the run up to working speed. In this context, the run up time constant is of most interest, as is any overshoot.

Safety circuit for the elimination of a faulty device or part of a control system with redundant circuits. The signal is generally triggered by measures for fault detection .

Periodic pressure surge in a hydraulic fluid that is caused by the constant changing of the individual displacement units in a hydraulic pump from the suction phase to the pressure phase and vice-vers

Is used to characterise the dynamic behaviour of devices in hydraulics, above all of proportional valves and servo valves. In the Bode diagram the amplitude response and phase-frequency response are s

Pilot pressure below which a component adopts the 0 position.