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Beliebt Rechnen >

inverselaplace (s+3)/(s^2+s+3)

Lösung

inverse laplace transformation

\frac{s + 3}{s ^{2} + s + 3}

Lösung

e^{- \frac{t}{2}} cos (\frac{11 t}{2}) + \frac{5 e ^{- \frac{t}{2}} sin ( \frac{11 t}{2} )}{11}

Schritte zur Lösung

L^{- 1} {\frac{s + 3}{s ^{2} + s + 3}}

Schreibe

\frac{s + 3}{s ^{2} + s + 3}

um:

\frac{s + \frac{1}{2}}{( s + \frac{1}{2} ) ^{2} + \frac{11}{4}} + \frac{5}{2} \cdot \frac{1}{( s + \frac{1}{2} ) ^{2} + \frac{11}{4}}

= L^{- 1} {\frac{s + \frac{1}{2}}{( s + \frac{1}{2} ) ^{2} + \frac{11}{4}} + \frac{5}{2} \cdot \frac{1}{( s + \frac{1}{2} ) ^{2} + \frac{11}{4}}}

Wende die lineare Eigenschaftder inversen Laplace-Transformation an:

Für Funktionen

f (s), g (s)

und Konstanten

a, b : L^{- 1} {a \cdot f (s) + b \cdot g (s)} = a \cdot L^{- 1} {f (s)} + b \cdot L^{- 1} {g (s)}

= L^{- 1} {\frac{s + \frac{1}{2}}{( s + \frac{1}{2} ) ^{2} + \frac{11}{4}}} + \frac{5}{2} L^{- 1} {\frac{1}{( s + \frac{1}{2} ) ^{2} + \frac{11}{4}}}

L^{- 1} {\frac{s + \frac{1}{2}}{( s + \frac{1}{2} ) ^{2} + \frac{11}{4}}} : e^{- \frac{t}{2}} cos (\frac{11 t}{2})

L^{- 1} {\frac{1}{( s + \frac{1}{2} ) ^{2} + \frac{11}{4}}} : e^{- \frac{t}{2}} \frac{2}{11} sin (\frac{11 t}{2})

= e^{- \frac{t}{2}} cos (\frac{11 t}{2}) + \frac{5}{2} e^{- \frac{t}{2}} \frac{2}{11} sin (\frac{11 t}{2})

Fasse

e^{- \frac{t}{2}} cos (\frac{11 t}{2}) + \frac{5}{2} e^{- \frac{t}{2}} \frac{2}{11} sin (\frac{11 t}{2})

zusammen:

e^{- \frac{t}{2}} cos (\frac{11 t}{2}) + \frac{5 e ^{- \frac{t}{2}} sin ( \frac{11 t}{2} )}{11}

= e^{- \frac{t}{2}} cos (\frac{11 t}{2}) + \frac{5 e ^{- \frac{t}{2}} sin ( \frac{11 t}{2} )}{11}

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