Hydraulic damping (of servomotors)
Damping D h of a hydraulic system which also applies in the absence of any leakage or friction: where A = piston area, σ = hydr. conductance of the system, m = total weight moved, V = oil volume under
Automatic fault detection
Procedure that compares the output of a system with the results from the calculation in a model of this system and that sounds an alarm if deviations are excessive.
Electromechanical displacement control of pumps/ motors
Actuation of the adjustment equipment in a pump/ motor by an electric motor. Permits in general adjustment speeds that are not very high. Mostly slower than electro-hydraulic adjustment.
Pressure head
Vertical height h in m of a column of fluid that, provided the density of the fluid is known, serves as a measure of the pressure that this column applies over the area of its base. The pressure head
Speed control circuit
Control circuit that has the task of adapting the rotation speed (e.g. of a hydraulic motor) as a controlled variable as accurately as possible to a setpoint. This action can be undertaken by changing
Differential pressure measurement
To measure the differential pressure Δp the two pressures p 1 and p 2 must be separated from each other by diaphragms that are connected by a plunger. The deflection of the two diaphragms then corresp
Sealing element
Replaceable functional element in a sealing system.
Data rate
Measure in kbit/s for the amount of data transmitted (and as a consequence for the transmission speed) between two computers or a computer and a peripheral. baud
Code translator
Converts the digital input signal in one code into a digital output signal with a different code (DIN 19 226).
Bond graphs
Graphic representation of dynamic systems using the electric-hydraulic analogy (Figure B 23) . It is used for simulations on personal computers in the time domain using the program TUTSIM and to deter