Adaptive controller
lly adapts to a changing controlled system. It is intended to ensure constant dynamic performance with a changing controlled system. For this purpose the microcomputer requires a very high signal processing
Sliding friction
sliding velocity. The sliding friction largely defines the hydromechanical efficiency of a device with seals.
Sealing compatibility index (DVI)
swelling, to complete dissolution of the elastomer. If the DVI of the intended hydraulic fluid is known, with the aid of diagrams it is possible to determine the expected volume change (Figure D 20) .
Impulse noise
impulse noise pressure meter or measurement has to be performed using a normal sound pressure meter with an impulse fitting added.
Electric signal processing
Signal processing with switching elements such as contactors among others. This technology is outdated, complex and slow. It is therefore only used for small, relatively simple systems. Exception: Safety
Synchronous control
Control , in which the signal action is synchronised with a clock signal (DIN 19 237). The clock signal comes from a clock device (clock, clock amplifier). This means that changes to the input signals
Piston pressure gauge
instrument which determines pressure by "weighing" it whereby the force on the piston is compared with the force exerted by calibrated weights. In order to eliminate friction, a motor is used to rotate
Compression set
the end of the pressure action only part of the volume springs back and the rest remains deformed with the consequence that the elastic volume and on seals the preload is reduced.
Volume increase on temperature rise
The volume V0 of a hydraulic medium increases (Vd) proportionally to the temperature difference with the expansion coefficient βT. For hydraulic oil, the expansion coefficient can be assumed to be 0.7*10-3
Pressure-signal function
On continuously adjustable directional valves : Dependency of the load pressure on the input signal with closed working lines around the hydraulic zero (Figure D 73 a) . On continuously adjustable pressure