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
Sliding friction
sliding velocity. The sliding friction largely defines the hydromechanical efficiency of a device with seals.
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
Impulse noise
impulse noise pressure meter or measurement has to be performed using a normal sound pressure meter with an impulse fitting added.
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
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
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 This technology is outdated, complex and slow.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
Mineral oils
pumps and valves and therefore choose a very compact design (unlike with pressurised water). Having said this, they are also associated with certain disadvantages such as the way their temperature-dependence
Force: impulse, signal: pulse
is same as the velocity involved. The time differential quotient for the impulse/pulse associated with a mass point is equal to the force F applied to it. 2. When investigating control circuit elements [...] transfer element are incorporated. A rectangular signal which only lasts for a very short time, compared with the timescale of interest, and has a very large amplitude is referred to as a pulse or shock function