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| align="right" style="padding-right: 1em;" | | | align="right" style="padding-right: 1em;" | | ||
| − | |<math> f( | + | |function <math> f(t) \ </math> |
| − | | <math>F( | + | | Laplace transform <math>F(s) \ </math> |
| + | | ROC <math>R</math> | ||
|- | |- | ||
| align="right" style="padding-right: 1em;" | | | align="right" style="padding-right: 1em;" | | ||
| − | | <math> af_1( | + | | <math> af_1(t)+bf_2(t) \ </math> |
| − | | <math> aF_1( | + | | <math> aF_1(s)+bF_2(s) \ </math> |
|- | |- | ||
| align="right" style="padding-right: 1em;" | | | align="right" style="padding-right: 1em;" | | ||
| − | | <math> f( | + | | <math> f\left( \frac{t}{a} \right) </math> |
| − | | <math> aF( | + | | <math> aF(as)</math> |
|- | |- | ||
| align="right" style="padding-right: 1em;" | | | align="right" style="padding-right: 1em;" | | ||
| − | | <math> f( | + | | <math> f(t-a)</math> |
| − | |<math> e^{ | + | |<math> e^{as}F(s) </math> |
|- | |- | ||
| align="right" style="padding-right: 1em;" | | | align="right" style="padding-right: 1em;" | | ||
| − | | <math> e^{- | + | | <math> e^{-at}f(t)</math> |
| − | | <math> u( | + | | <math> u(s-a) = |
\begin{cases} | \begin{cases} | ||
| − | F( | + | F(s-a) & s>a \\ |
0 & t<a | 0 & t<a | ||
| − | \end{cases} </math> | + | \end{cases} </math> |
| + | |???? How can a complex number be greater than a??? | ||
|- | |- | ||
| align="right" style="padding-right: 1em;" | | | align="right" style="padding-right: 1em;" | | ||
Revision as of 09:49, 8 November 2010
IT SEEMS LIKE THE VARIABLES s AND t WERE INTERCHANGED BELOW.
| Laplace Transform Pairs and Properties | |||
|---|---|---|---|
| Definition | |||
| Laplace Transform | $ F(s)=\int_{-\infty}^\infty f(t) e^{-st}dt, \ s\in {\mathbb C} \ $ | ||
| Inverse Laplace Transform | add formula here | ||
| Properties of the Laplace Transform | |||
| function $ f(t) \ $ | Laplace transform $ F(s) \ $ | ROC $ R $ | |
| $ af_1(t)+bf_2(t) \ $ | $ aF_1(s)+bF_2(s) \ $ | ||
| $ f\left( \frac{t}{a} \right) $ | $ aF(as) $ | ||
| $ f(t-a) $ | $ e^{as}F(s) $ | ||
| $ e^{-at}f(t) $ | $ u(s-a) = \begin{cases} F(s-a) & s>a \\ 0 & t<a \end{cases} $ | ???? How can a complex number be greater than a??? | |
| $ sf(s)-F(0) $ | $ F'(t) $ | ||
| $ s^2f(s)-sF(0)-F'(0) $ | $ F''(t) $ | ||
| $ s^{n}f(s)-\sum_{k=1}^ns^{n-k}F^{(k)}(0) $ | $ F^{(n)}(t) $ | ||
| $ f'(s) $ | $ -tF(t) $ | ||
| $ f''(s) $ | $ t^2F(t) $ | ||
| $ f^{(n)}(s) $ | $ (-1)^{(ntn)}F(t) $ | ||
| $ \frac{f(s)}s $ | $ \int_{0}^{t} F(u) du $ | ||
| $ \frac{f(s)}{s^n} $ | $ \int_{0}^{t}...\int_{0}^{t}F(u)du^n = \int_{0}^{t}\frac{{(t-u)}^{n-1}}{(n-1)!} F(u)du $ | ||
| $ f(s)g(s) $ | $ \int_{0}^{t}F(u)G(t-u)du $ | ||
| $ \int_{s}^{\infty}f(u)du $ | $ \frac{F(t)}t $ | ||
| $ \frac1{1-e^{-sT}}\int_{0}^{T}e^{-su}F(u)du $ | $ F(t)=F(t+T) $ | ||
| $ \frac{f(\sqrt{s})}s $ | $ \frac{1}{\sqrt{{\pi}t}}\int_{0}^{\infty}e^{-\frac{u^2}4t}F(u)du $ | ||
| $ \frac1sf(\frac1s) $ | $ \int_{0}^{\infty}J_0(2\sqrt{ut})F(u)du $ | ||
| $ \frac1{g^{n+1}}f(\frac1s) $ | $ t^{\frac{n}2}\int_{0}^{\infty}u^{-\frac{n}2}J_n(2\sqrt{ut})F(u)du $ | ||
| $ \frac{s+\frac1s}{s^2+1} $ | $ \int_{0}^{t}J_0(2\sqrt{u(t-u)})F(u)du $ | ||
| please continue | place formula here | ||
| please continue | place formula here | ||
| please continue | place formula here | ||
| please continue | place formula here | ||
| please continue | place formula here | ||
| Laplace Transform Pairs | |||||
|---|---|---|---|---|---|
| notes | Signal | Laplace Transform | ROC | ||
| unit impulse/Dirac delta | $ \,\!\delta(t) $ | 1 | $ \text{All}\, s \in {\mathbb C} $ | ||
| unit step function | $ \,\! u(t) $ | $ \frac{1}{s} $ | $ \mathcal{R} \mathfrak{e} \lbrace s \rbrace > 0 $ | ||
| $ \,\! -u(-t) $ | $ \frac{1}{s} $ | $ \mathcal{R} \mathfrak{e} \lbrace s \rbrace < 0 $ | |||
| $ \frac{t^{n-1}}{(n-1)!}u(t) $ | $ \frac{1}{s^{n}} $ | $ \mathcal{R} \mathfrak{e} \lbrace s \rbrace > 0 $ | |||
| $ -\frac{t^{n-1}}{(n-1)!}u(-t) $ | $ \frac{1}{s^{n}} $ | $ \mathcal{R} \mathfrak{e} \lbrace s \rbrace < 0 $ | |||
| $ \,\!e^{-\alpha t}u(t) $ | $ \frac{1}{s+\alpha} $ | $ \mathcal{R} \mathfrak{e} \lbrace s \rbrace > -\alpha $ | |||
| $ \,\! -e^{-\alpha t}u(-t) $ | $ \frac{1}{s+\alpha} $ | $ \mathcal{R} \mathfrak{e} \lbrace s \rbrace < -\alpha $ | |||
| $ \frac{t^{n-1}}{(n-1)!}e^{-\alpha t}u(t) $ | $ \frac{1}{(s+\alpha )^{n}} $ | $ \mathcal{R} \mathfrak{e} \lbrace s \rbrace > -\alpha $ | |||
| $ -\frac{t^{n-1}}{(n-1)!}e^{-\alpha t}u(-t) $ | $ \frac{1}{(s+\alpha )^{n}} $ | $ \mathcal{R} \mathfrak{e} \lbrace s \rbrace < -\alpha $ | |||
| $ \,\!\delta (t - T) $ | $ \,\! e^{-sT} $ | $ \text{All}\,\, s\in {\mathbb C} $ | |||
| $ \,\cos( \omega_0 t)u(t) $ | $ \frac{s}{s^2+\omega_0^{2}} $ | $ \mathcal{R} \mathfrak{e} \lbrace s \rbrace > 0 $ | |||
| $ \, \sin( \omega_0 t)u(t) $ | $ \frac{\omega_0}{s^2+\omega_0^{2}} $ | $ \mathcal{R} \mathfrak{e} \lbrace s \rbrace > 0 $ | |||
| $ \,e^{-\alpha t}\cos( \omega_0 t) u(t) $ | $ \frac{s+\alpha}{(s+\alpha)^{2}+\omega_0^{2}} $ | $ \mathcal{R} \mathfrak{e} \lbrace s \rbrace > -\alpha $ | |||
| $ \, e^{-\alpha t}\sin( \omega_0 t)u(t) $ | $ \frac{\omega_0}{(s+\alpha)^{2}+\omega_0^{2}} $ | $ \mathcal{R} \mathfrak{e} \lbrace s \rbrace > -\alpha $ | |||
| $ u_n(t) = \frac{d^{n}\delta (t)}{dt^{n}} $ | $ \,\!s^{n} $ | $ All\,\, s $ | |||
| $ u_{-n}(t) = \underbrace{u(t) *\dots * u(t)}_{n\,\,times} $ | $ \frac{1}{s^{n}} $ | $ \mathcal{R} \mathfrak{e} \lbrace s \rbrace > 0 $ | |||
