Controller concepts
I-controller and a D-controller. P-T1-controller [PT1-controller]: P-controller with P-T2-controller [PT2-controller]: P-controller with 2nd order time delay. These controllers work consistently in a single loop
Resolution
change at the measuring device . For variable throttles : The ratio of the change in cross-section (and with it the flow) to the throttle adjustment travel ΔA/Δh.
Digital measured signal
With a digital measured signal the unlimited number of values of the measured variable faces the limited number of values of the measured signal . A value range for the measured variable is therefore assigned
Double acting cylinder
type can be found in almost all fields of application. Double acting cylinders are mostly equipped with a piston rod ( differential cylinder ). However, two piston rods are also fitted ( synchronizing cylinder
Hydrostatic traction drive
Hydrostatic transmission for a stepless vehicle drive which generally operates in a closed circuit with primary control (pump control) or primary and secondary control (pump and motor control). If a suitable
O-ring seal
Circular ring with an almost perfectly round cross section which is mainly used in fluids technology to seal machine parts when at rest ( Figure O 11 ). Its sealing action is achieved through axial or
Phase-frequency response
the sinusoidal input signal . In graphical terms, it is mainly represented as a Bode diagram along with the amplitude response based on the value, expressed in logarithmic terms, for the frequency f or
Pilot control behaviour
Provides information on the behaviour of the controlled variable with a changing reference variable , but constant disturbance variable . The controlled variable responds to external effects on the control
Concentrates
Elements to be mixed in with pressurised water ( HWBF ) to give the water lubricity and corrosion protection. They usually make up 2 to 5% of a hydraulic fluid. A distinction is made between three groups:
Velocity of sound pressure waves
mineral oil it is dependent on its air content. In pure oil it is approx. 1 500 m/s and drops rapidly with undissolved air in the oil. For this reason an average value of 1 300 m/s is used in the majority