This information is part of the Modelica Standard Library maintained by the Modelica Association.

LowpassButterworth

Output the input signal filtered with a low pass Butterworth filter of any order

Information
CONNECTORS
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NameTypeDescription
uRealInputConnector of Real input signal
yRealOutputConnector of Real output signal
PARAMETERS
NameTypeDefault ValueDescription
nInteger2Order of filter
fFrequencyCut-off frequency
initTypeInitModelica.Blocks.Types.Init.NoInitType of initialization (1: no init, 2: steady state, 3: initial state, 4: initial output)
x1_startReal[m]zeros(m)Initial or guess values of states 1 (der(x1)=x2))
x2_startReal[m]zeros(m)Initial or guess values of states 2
xr_startReal0.0Initial or guess value of real pole for uneven order otherwise dummy
y_startReal0.0Initial value of output (states are initialized in steady state if possible)
mIntegerinteger(n/2)
evenOrderBoolean2*m == n
wReal2*pi*f