Hydraulic resonance frequency
stability of a hydraulic system. Whatever applies to this also applies to general natural frequency . With hydraulic drives, it is more or less equivalent to the natural angular frequency because of their
Null bias adjustment
dependent on the device. It is possible therefore to correct, for example, a null bias associated with the strain gauge at the Wheatstone bridge or trim this using lasers if a thin-film strain gauge is
Vertical column pressure gauge
Pressure gauge that operates based on the principle of the comparison of a pressure with the barometric pressure of a column of fluid (Figure F 23) . They are only suitable for measuring low pressures
Logic diagram
Neutral representation of a circuit diagram (for a function sequence) in accordance with IEC (DIN 40 700). The logic diagram is not specific to any component, i.e. it applies to hydraulic, pneumatic or
Internal fluid admission
discharge of the pressure fluid in pumps/motors through the inside of the displacement unit. For example, with valve plate controlled radial piston machines where the pistons are supported at the (outer) stroke
Single edge control
of the speed of a cylinder via control edges. Every displacement chamber has two flow resistances. With the single edge control one resistance can change, the second resistance is however constant (Figure
Resonance
n, even at lower power. In fluid technology, the resonance is primarily of importance for systems with feedback () and in the case of sound generation.
Predetermined breaking part (predetermined breaking point)
Part of a system, which is designed with the intention of breaking in the case of overloading in order to protect the rest of the machine. At the same time, it is to be arranged such that it is easy to
Analogue computer
among others; the problem as a whole is represented here. Analogue computers are progressive computers with continuous comparison values and operate dynamically, unlike digital computers. Analogue computers
Axial gap compensation on gear pumps (so-called gap compensation)
pressure-controlled leakage that occurs here can be reduced if the clearance gap at the side is reduced with increasing pressure. The axial compensation is undertaken by springs that press the bearing bush or