Follow up control
piston velocity should correspond to this ramp function as accurately as possible. regulator controller with fixed set point
Hydrostatic transmission
Interaction of one or more pumps (primary element) with one or more (secondary element, in most cases a hydraulic motor). The distance between the two devices is of no significance (open transmission)
5-chamber valve
Directional valve with five annular channels in the housing for ports A, B, P and T. The spring chambers F 1 and F 2 remain outside the control area of the valve and can have a dedicated drain port (Figure
Amplifier card
activate a continuously adjustable valve (not just for amplifiers) are housed on a card (normally with a European format) ( Figure V 19 ). This includes not only control amplifiers, but also adjustment
Noise level (A-weighted) L pA
method known as A-weighting. Here, the signal is amplified differently across different frequencies, with the lower frequencies, to which the ear is less sensitive, amplified to a lesser extent, as shown
Dead volume
e, but must be placed under pressure as the working cycle changes. The volume increase associated with this changes the natural frequency of the device, which is part of the dead volume. In addition, the
Clamping pressure
Pressure p A or p B in the operating ports A or B with a load that is not subjected to load and hydraulic zero. The clamping pressure is then equal to half the sum pressure . This statement does not apply
Sealing gap
Gap between two chambers with different pressures. To prevent leakage either the gap must be designed such that no pressure flow can be produced ( gap seal ) or special elements are used, the seals. If
Filter element
(exception: metal filters). The tissue filter elements used most frequently are generally designed with multiple layers as (Figure F 15) shows. The actual element comprises, e.g. a glass fibre tissue, which
Calculating the sound power
accordance with the DIN 45 635 Part 1 framework ( Figure S 11 ) and DIN EN 23 741. The sound power of a machine calculated under measurement conditions does not allow for a final statement to be made with regard