TRANSFORMADAS DE LAPLACE DE LAS SIGUIENTES FUNCIONES.pdf
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Transcript of TRANSFORMADAS DE LAPLACE DE LAS SIGUIENTES FUNCIONES.pdf
![Page 1: TRANSFORMADAS DE LAPLACE DE LAS SIGUIENTES FUNCIONES.pdf](https://reader037.fdocumento.com/reader037/viewer/2022100508/55cf9231550346f57b9480ae/html5/thumbnails/1.jpg)
TRANSFORMADAS DE LAPLACE DE LAS SIGUIENTES FUNCIONES:
1. FUNCIÃN CONSTANTE: ð(ð ) = ð¿{1}
ð(ð ) = ð¿{1} = â« ðâð ð¡ ââ
0
1ðð¡ = limðµââ
â« ðâð ð¡ âðµ
0
1ðð¡
ð(ð ) = limðµââ
(ðâð ðµ
ð +1
ð )
ððð¡ððððð : ð(ð) = ð³{ð} =ð
ð, ðð ð > ð.
2. FUNCION EXPONENCIAL:
ð¹(ð¡) = ððð¡
ððððððððð ððð ð¡ðððð ðððððððð ðð ððððððð ð ð ð¡ððððð:
ð(ð ) = ð¿{ð¹(ð¡)} = ð¿{ððð¡} = â« ðâð ð¡ ââ
0
ððð¡ðð¡ = â« ðâ(ð âð)ð¡â
0
ðð¡
= âðâ(ð âð)ð¡
ð â ð=
1
ð â ð(0 â 1) =
1
ð â ð ðððð ð > ð
ððð ðð ð¡ððð¡ð ð ð ð¡ðððð: ð(ð) = ð³{ððð} =ð
ð â ð ðððð ð > ð
3. FUNCION tn, n > 0 entero:
ð(ð ) = ð¿{ð¹(ð¡)} = ð¿{ð¡ð} = â« ðâð ð¡ ââ
0
ð¡ððð¡, integrando por partes se tiene:
{ð¢ = ð¡ð
ðð£ = ðâð ð¡ðð¡ ððð ððð£ðððððâ {
ðð¢ = ðð¡ðâ1ðð¡
ð£ = âðâð ð¡
ð
ð(ð ) = â« ðâð ð¡ ââ
0
ð¡ððð¡ = âðâð ð¡
ð +ð
ð â« ðâð ð¡ ââ
0
ð¡ððð¡
ðððð ð > 0, ð > 0, ð¡ððâð ð¡ â 0, ðð¢ðððð ð¡
â +â, ðð¢ððð ð ð ð¡ðððð:
ð(ð ) =ð
ð â« ðâð ð¡ ââ
0
ð¡ðâ1ðð¡ = ð
ð ð¿{ð¡ðâ1} â â ââââââââ(ðŒ)
Siguiendo el mismo procedimiento se llega a:
ð¿{ð¡ðâ(ðâ1)} = ð¿{ð¡} =1
ð ð¿{ð¡0} =
1
ð 2 ðð¢ðð ð¡ð ðð¢ð: ð¿{1} =
1
ð ðð¢ð ððððððð§ðððð ðð (ðŒ):
ð(ð ) =ð
ð âð â 1
ð ⊠.1
ð â 1
ð =
1!
ð ð+1
ð(ð) = ð³{ðð} =ð!
ðð+ð , ðð ð > ð.
![Page 2: TRANSFORMADAS DE LAPLACE DE LAS SIGUIENTES FUNCIONES.pdf](https://reader037.fdocumento.com/reader037/viewer/2022100508/55cf9231550346f57b9480ae/html5/thumbnails/2.jpg)
4. FUNCIÃN sen(at):
ð(ð ) = ð¿{ð ðð ðð¡} = â« ðâð ð¡ ââ
0
ð ðð ðð¡ðð¡, ððð¡ððððððð ððð ðððð¡ðð ð ð ð¡ðððð:
ð(ð ) = ðâð ð¡ (ð â ð ðð ðð¡ + ð â cos ðð¡
ð 2 + ð2) , ðððð ð > 0, ðâð ð¡ â 0, ðð¢ðððð ð¡ â +â.
ððð¡ððððð : ð(ð) = ð³{ððð ðð} =ð
ðð + ðð, ðð ð > ð.
5. FUNCION cos(at):
ð(ð ) = ð¿{ððð ðð¡} = â« ðâð ð¡ ââ
0
ððð ðð¡ðð¡, ððð¡ððððððð ððð ðððð¡ðð ð ð ð¡ðððð:
ð(ð ) = ðâð ð¡ (ð â ððð ðð¡ + ð â ð ðð ðð¡
ð 2 + ð2) , ðððð ð > 0, ðâð ð¡ â 0, ðð¢ðððð ð¡ â +â.
ððð¡ððððð : ð(ð) = ð³{ððð ðð} =ð
ðð + ðð, ðð ð > ð.
EJEMPLOS:
Ejemplo: ð»ððððð ð(ð ) = ð¿{ð ðð 7ð¡}
ððð ð¿{ð ðð 7ð¡} =1
ð 2 + 1= ð(ð ), ððð¡ððððð
ð¿{ð ðð 7ð¡} =1
7ð (ð
7) =
1
7(
1
ð 2
49+ 1) =
7
ð 2 + 49
ð³{ððð ðð} =ð
ðð + ðð
Ejemplo: ð»ððððð ð(ð ) = ð¿{ððð 2ðð¡}
ð¶ððð ððð 2ðð¡ =1
2(1 + ððð 2ðð¡) =
1
2(1
ð¥+
ð¥
ð 2 + 4ð2) ð(ð ) = ð¿{ððð 2ðð¡}
ð(ð ) = ð¿{ððð 2ðð¡} =1
2(1
ð¥+
ð¥
ð 2 + 4ð2) =
ðð + ððð
ð(ðð + ððð)
Ejemplo: ð·ðððð ð¡ððð ð(ð ) = ð¿{ð¡ cosh ðð¡} =ð 2+ð2
(ð 2âð2)2
Aplicando la transformada de la multiplicación por t se tiene:
ð¿{ð¡ cosh ðð¡} =ð
ð 2 â ð2 â ð¿{ð¡ cosh ðð¡} = â
ð
ðð ð¿{cosh ðð¡}
ð¿{ð¡ cosh ðð¡} = âð
ðð (
ð
ð 2 â ð2) = â
ð 2 â ð2 â ð (2ð )
(ð 2 â ð2)2=
ð 2 + ð2
(ð 2 â ð2)2
ð³{ð ððšð¬ð¡ ðð} =ðð + ðð
(ðð â ðð)ð
![Page 3: TRANSFORMADAS DE LAPLACE DE LAS SIGUIENTES FUNCIONES.pdf](https://reader037.fdocumento.com/reader037/viewer/2022100508/55cf9231550346f57b9480ae/html5/thumbnails/3.jpg)
Ejemplo: ð»ððððð ð(ð ) = ð¿ {ð ððâ ð¡
ð¡}
ð(ð ) = ð¿{ð ððâ ð¡} = ð¿ {ðð¡ â ðâð¡
2} =
1
2{ðð¡ â ðâð¡} =
1
2(1
ð â 1â
1
ð + 1)
ðŽâððð ððððððððð ðð ð¡ðððð ððððððð ðð ðð ððð£ðððóð:
ð¿ {ð ððâ ð¡
ð¡} = â«
1
2(1
ð â 1â
1
ð + 1)ðð
â
ð
=1
2[ln(ð â 1) â ln(ð + 1)]
=1
2ðð (ð â 1
ð + 1) = 0 â
1
2ðð (ð â 1
ð + 1)
ð³ {ðððð ð
ð} =
ð
ððð(
ð + ð
ð â ð)