Technical cybernetics
Deals with the theoretical observation of the dynamic behaviour of technical systems in the broadest sense. For example, as a technical system with a certain dynamic performance, which is highly non-l
Buckling of rams
Slim pressure rods such as thin piston rods may buckle outwards if the compressive force F exceeds a permissible value (Figure K 12) . This value is referred to as the buckling force F K. Cylinders wi
Digital control theory
Covers especially the characteristics of discrete time systems and therefore goes beyond analogue, linear control theory . Digital control theory has become very important due to the possibilities off
Sealing friction
If contact seals must seal against moving surfaces, friction is produced that causes wear. The friction force necessary to overcome this friction reduces at the same time the movement force (e.g. pist
Dead zone compensation
Underlap compensating signal
Flow force
A flowing fluid exerts flow forces in the case of changes to the speed and/or direction, which are particularly noticeable on the control pistons (control spools) of directional valves . They increase
Drag flow
Flow rate , which builds up beneath a seal or guide ring as the fluid sticks on the moved metal surface by adhesion. The drag flow is responsible for the drag flow pressure , but also for leaks in int
Opening pressure
Pressure at which the safety valve delivers the stroke required for the mass flow to be discharged. The opening pressure is equal to the response pressure (operating conditions) plus the opening press
Piston type accumulator
Hydraulic accumulator with a free-moving piston as a separator between gas and hydraulic fluid (Figure K 19) . Since there is no separating wall made of rubber, the fatigue resistance is greater than
Vane pump
Vane pumps operate according to the Positive displacement principle . The moving vanes, which are guided radially in a rotor and are supported in an eccentric stroke ring (stator), create an increasin