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undertaken by changing the flow rate to the load. For this purpose a control with throttle is used that can remove the flow rate not required out of the circuit via flow valves ( throttle valve , 2 or 3-way

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

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

performing a linear movement. All displacement machines – with the exception of the screw pumps – can be classified using the aforementioned schematic. Opposite: flow machines .

the seals used — is a determining variable. The smaller it is, the smaller the velocity, at which it can still run smoothly. As the friction also depends on the pressure, that too is an influencing factor:

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

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

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

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

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