.ComplexLib.Examples.VaryingResistance .ComplexLib.Examples.VaryingResistanceThis example shows a purely electric circuit containing a
VariableResistor component (R3). The resistance of R3 is determined
depending on time function of component Ramp. It starts at a very
small value (0.01 Ohm) and reaches 5 Ohm after 10 s.
Using this example, we would like to give an idea how one can
decide if the system is in a quasi-stationary mode or not.
The main (and only) time constant of the system reads T =
L*(R2+R3)/(R2*R3). It is well-known for first-order components
that, after a step-like change of an input signal, the output
signal reaches 95 % of �ts final value after a time period of
3*T. This time period is called decayTime.
Checking the difference between decayTime and the time
interval of the simulation experiment yields the information if the
system is in a quasi-stationary mode.
Because of variable resistor R3, it is necessary to calculate
decayTime during the simulation experiment according to
decayTime = 3*L*(R2+R3)/(R2*R3). The Boolean
quasiStationaryOk tests if decayTime is smaller
than the simulation interval tInterval (which is necessary
for quasi-stationary mode). Hence in the first part of the
simulation (Time < 2.4 s), the system is not in a
quasi-stationary mode and the appropriate points in time of
the result curves represent only a series of steady states without
any correlation with time. In the second part of the
simulation (Time > 2.4 s), the system is quasi-stationary
and the result curves reflect a correct relationship with time.
Simulate until 10 s.
Plot in seperate windows