SEÑALES Y SISTEMAS - MOMENTO 3
SEÑALES Y SISTEMAS
MOMENTO 3
NOMBRES
DIEGO FERNANDO CORTES ANDRADE
JHON DARWIN FAJARDO
CARLOS ANDRES LONDOÑO
1
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SEÑALES Y SISTEMAS - MOMENTO 3
TUTOR(A): TANIA LISETH ACEVEDO GRUPO: 203042-45
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SEÑALES Y SISTEMAS - MOMENTO 3
UNIVERSIDAD NACIONAL ABIERTA Y A DISTANCIA – UNAD ESCUELA DE CIENCIAS BASICAS E INGENIERIA NOVIEMBRE DE 2016
INTRODUCCION El desa!ll! del "a#a$! es"% ela&'!(ad! &!( el )la("ea*'e("! de la +,a de a&"'.'dades e( la /,e se )!,(d'1aa( las "e*%"'&as e( las &,ales se e&!(!&e%( l!s l!s &!(&e &!(&e)" )"!s !s #%s' #%s'&! &!ss de '( '(&' &')' )'!s !s )!)' )!)'eda edade dess de la "a(s "a(s! !* *ad ada a )!)'edades de la "a(s!*ada de La)la&e S, a)l'&a&'6( es",d'! se d'! )! *ed'! del desa!ll! de l!s e$e&'&'!s )!),es"!s )aa la a&"'.'dad del *!*e("! 37 d!(de l!s '("e+a("es del +,)! desa!lla!( l!s )!#l )!#le* e*as as )!),e )!),es" s"!s !s77 &!*! &!*! *ed' *ed'! ! )aa )aa la a)!) a)!)'a 'a&' &'6( 6( del del &!(!& &!(!&'* '*'e 'e(" ("! ! desa!ll! de las 8a#'l'dades (e&esa'as7 )aa s,)ea l!s !#$e"'.!s )!),es"!s e( el &,s!7 la &!(s"a("e e"!al'*e("a&'6( de la ","!a )e*'"'6 !"ale&e (,es"! a)e(d'1a$e &!e+' l!s e!es
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SEÑALES Y SISTEMAS - MOMENTO 3
EJERCICIOS MOMENTO 3
1. Usando Usando como como guía el ejemplo ejemplo 11.6 de la página página 342 del libro libro guía (Ambardar, Tema a estudiar Trans!ormada in"ersa de #aplace$, determine analíticamente %(t$, sabiendo &ue H ( s )=
3s
( s + 3 ) ( s + 1 )2
Solución 2
s +1 ¿
¿ ¿
H ( ( s )=
k 1 A 0 + s+ 3 ¿
Calculamos K1 H ( ( s )=
3s k 1 = s + 3 ( s + 3 ) ( s + 1 )2
2
s +1 ¿
¿ ¿ 3s K 1 1= ¿
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SEÑALES Y SISTEMAS - MOMENTO 3
K 1=
−9 4
=−2.25
Calculamos A 0 2
s+1 ¿
¿ ¿
H ( ( s )=
A 0=
A 0=
A 0
¿
3s
( s+ 3 )
¿s=−1
3s
(−1 + 3 )
=
−3 2
=−1.5
Calculamos A 1 A 1=
d 3s = ¿ ds ( s + 3 ) s =−1 2
s +3 ¿
¿ ¿ 0∗( s + 3 )−3∗( 3) A 1= ¿ 2
s +3 ¿
¿ ¿
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SEÑALES Y SISTEMAS - MOMENTO 3
A 1=
9 4
=2.25
Remplazamos 2
s+1 ¿
¿ ¿
x ( s ) =
−2.25 1.5 − ( s+3 ) ¿ 2
s +1 ¿
¿ ¿
X ( ( t )=−2.25∗ L
−1
1
s +3
1
−1,5∗ L−1 ¿
−t
− 2 t
X ( ( t )=−2.25 e u ( t )−1,5 e
x ( s ) =
−9 −3 9 − + 4 ( s + 3 ) 2 ( s + 1 )2 4 ( s +1 ) K
K −αt → K e u( t ) s + α
h ( t ) =
−2 t
u ( t ) + 2.25 e
−9 4
−3 t
e
; 3
( n−1 ) ! −t
n− 1
t
9 − t 4
u (t ) − t e u(t ) + e u(t ) 2
−αt
e
u( t )
u ( t )
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SEÑALES Y SISTEMAS - MOMENTO 3
2. Usand Usando o como como guía guía el ejempl ejemplo o 1'.16 1'.16 de la la página página 62 62 del del libro libro guía guía (Ambar (Ambardar dar,, Tema a estudi estudiar ar )espue )espuesta sta de un sistem sistema a discreto, a partir de la !unci*n de trans!erencia $, determine +ndado &ue
−0.5 z H ( z )= z − 0.2 x [ n ]= 4 u [ n ] Solución
La tras!orma"a "# u #scal$ u%tar%o #sta "a"o as&' x ( z )=
(4 )
z z −1
(−) z
z 1
pero como hay 4 unidades unidadesde de entrada entrada multiplican multiplicando dotenem tenemos os que :
=
4 z
z −1
y [ z z ] = H ( ( z )∗( z )
−0.5 z 4 z −2 z2 = z −0.2 z −1 ( z −1 )( z −0.2)
(#sarrollamos (#sarrollamos !racc%o#s )arc%al#s
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SEÑALES Y SISTEMAS - MOMENTO 3
−2 = A ( 0.8 ) A =
−2 0.8
=−2.5
Para z = 0.2
−2 ( 0.2)= A ( 0.2−0.2 ) + B ( 0.2 −1) −0.4= B (−0.8 ) B=
−0.4 =0.5 −0.8
A+ora r#m)la,amos alor#s y ( z ) y ( z ) −2.5 2.5 0.5 0.5 −0.5 z = =− + = = + z z −1 z − 0.2 ( z −1 )( z −0.2 ) z −1 z − 0.2 z
y ( )=
0.5 z
z −0.2
−
2.5 z
z −1
n
0.2 ¿ u
n ] =−2.5 u [ n ] +0.5 ¿ [ n ] a
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SEÑALES Y SISTEMAS - MOMENTO 3
3. Usando como guía el ejemplo 17.8 de la página 606 del libro guía (Ambardar, Te Tema ma a esudiar! Trans"ormada Trans"ormada in#ersa $ mediane di#isi%n larga, &di#isi%n de polinomios', deermine )*n+ dado ue!
H ( z )=
Solución
−2 + z 2 1 −2 z + 2 z
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SEÑALES Y SISTEMAS - MOMENTO 3
−1.5 z−1
1.5 z
−2
− z −2
−0.75 z−3 −3 0.75 z
Por lo tanto, según este resultado se establece que: 1 −1 1 −2 3 −3 − z + z 2 2 4
H ( ( z z )= z
La secuencia h[n] puede escribirse de la siguiente manera: 1
1
3
2
2
4
h [ n ] = " ( n −1 )− " ( ( n−2 ) + " ( n −3 )
1
1 3
2
2 4
h [ n ] ={ ˘ 0 # #− #
#! }
M0to"o coc#)tual clear
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SEÑALES Y SISTEMAS - MOMENTO 3
CONCLUSIONES
•
A)l'&a(d! l! .'s"! e( el *a&! "e6'&!7 se ),ede( !#"e(e des"e1as7 de "al
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SEÑALES Y SISTEMAS - MOMENTO 3
•
Se desa!lla( 8a#'l'dades l!+a(d! &!*! '( a&'l'"a el desa!ll! de las )!s"e'!es a&"'.'dades9
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SEÑALES Y SISTEMAS - MOMENTO 3