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lang-mma
BodePlotinternally callsTransferFunctionModelif the model is inStateSpacerepresentation? $\endgroup$SetPrecisiononly helps insideBodePlotfunction. If you try to evaluate the followingTransferFunctionModel[SetPrecision[osg2SSCL /. {k1 -> 0.5, k2 -> 0.5, omega1 -> 2 Pi 50, omega2 -> 2 Pi 500}, 20], s]on its own, wrong result is again obtained. On the other side if you changeMethodto "Inverse" as inTransferFunctionModel[osg2SSCL /. {k1 -> 0.5, k2 -> 0.5, omega1 -> 2 Pi 50, omega2 -> 2 Pi 500}, s, Method->"Inverse"]the correct result is obtained. $\endgroup$BodePlot. If you want to go one step further down the rabbit hole, the hiccup is inCharactersticPolynomial. The method "Inverse" does not useCharactersticPolynomial, although such a brute approach will choke for larger systems. $\endgroup$BodePlot[TransferFunctionModel[SetPrecision[osg2SSCL /. {k1 -> 0.5, k2 -> 0.5, omega1 -> 2 Pi 50, omega2 -> 2 Pi 500}, 20], s], {10^2, 10^4}, GridLines -> Automatic, PlotLayout -> "Magnitude"]I still get wrong result.MMA 11.3 @ Win10$\endgroup$