Sensitivity of hydraulic devices to dirt
and wear on the sliding areas. This primarily involves particles of around the size of the gap: they can score the sliding surfaces, while the larger particles gather in front of the gap and the smaller particles
A/D converter
proportional number. The quantisation error caused by the stepwise digitisation in the A/D converter can be minimised by a higher resolution : A binary system with 4 bits (24) produces 15 steps and therefore
Hydraulic pump
energy. Hydraulic pumps are mostly driven by electric drives or combustion engines. Hydraulic pumps can be classified according to various aspects: Acted on from the outside or inside Constant or variable
Processing of actual values (or signals)
scaled in some cases, possibly amplified and perhaps even multiplied by another variable before it can be processed in the computer. Example: the processing of actual values (or signals) for a proportional
Sum power controller
this way, although the delivery flows of both pumps are reduced by the same amount, the pressures can increase to the power limit ( Figure S 112 ). The sum power controller is a typical control system
Pipe impedance
referred to as a wave. Inside pipes, given the small diameter compared with the relevant wavelengths, it can be assumed there will be some one-dimensional propagation of oscillation. Pipe impedance (also known
Displacement machine (displacement unit)
performing a linear movement. All displacement machines – with the exception of the screw pumps – can be classified using the aforementioned schematic. Opposite: flow machines .
Vane pump
200 bar). If the stroke ring has a suitable curved path instead of a circular path, then each vane can make two or more strokes during one revolution ( multi-stroke hydrostatic pumps/motors ). With this
Digital signal processing
are prevented. On the usage of digital signal processing in controllers the controller parameters can be adjusted to changing operating parameters (e.g. adaptive controllers ). Finally, digital signal
Noise level L p
equal to the noise pressure of the human hearing threshold level at 1000 Hz in dB. The noise level can also be determined for certain frequency bands. The noise level states how much noise is present at