Bab
Bab 5: 5: Root Root Locus Locus EL303: Sistem EL303: Sistem KendaliKendali
__________________________________________________________________________ __________________________________________________________________________
Teknik
Teknik Elektro Elektro ITB ITB [EYS-1998] [EYS-1998] hal hal 5-5-11
ROOT LOCUS
ROOT LOCUS
Ì
Ì
Pendahuluan
Pendahuluan
Ì
Ì
Dasar Root Locus
Dasar Root Locus
Ì
Ì
Plot Root Locus
Plot Root Locus
Ì
Ì
Aturan-Aturan Penggambaran Root Locus
Aturan-Aturan Penggambaran Root Locus
Ì
Ì
Root Locus
Root
Locus Melalui
Melalui MATLAB
MATLAB
Ì
Ì
Kasus Khusus
Kasus Khusus
Ì
Ì
Analisis Sistem Kendali Melalui Root Locus
Analisis Sistem Kendali Melalui Root Locus
Ì
Ì
Root
Root
Locus
Locus
untuk
untuk
Sistem
Sistem
dengan
dengan
Transport Lag
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Bab
Bab 5: 5: Root Root Locus Locus EL303: Sistem EL303: Sistem KendaliKendali
Ì
Ì
PENDAHULUAN
PENDAHULUAN
n
n
Karakteristik tanggapan transient sistem loop
Karakteristik tanggapan transient sistem loop
tertutup dapat ditentukan dari lokasi pole-pole (loop
tertutup dapat ditentukan dari lokasi pole-pole (loop
tertutupnya).
tertutupnya).
n
n
Bila K berubah, maka letak pole-pole nya juga
Bila K berubah, maka letak pole-pole nya juga
berubah.
berubah.
n
n
Perlu pemahaman pola perpindahan letak pole-pole
Perlu pemahaman pola perpindahan letak pole-pole
dalam bidang s.
dalam bidang s.
n
n
Desain sistem kendali melalui gain adjusment: pilih
Desain sistem kendali melalui gain adjusment: pilih
K sehingga pole-pole terletak ditempat yang
K sehingga pole-pole terletak ditempat yang
diinginkan.
diinginkan.
n
n
Desain
Desain
sistem
sistem
kendali
kendali
melalui
melalui
kompensasi:
kompensasi:
memindahkan letak pole yang tak diinginkan melalui
memindahkan letak pole yang tak diinginkan melalui
pole-zero cancellation.
pole-zero cancellation.
n
n
Mencari akar-akar persamaan karakteristik untuk
Mencari akar-akar persamaan karakteristik untuk
orde tinggi sulit, terlebih dengan K sebagai variabel.
orde tinggi sulit, terlebih dengan K sebagai variabel.
(Alternatif: gunakan MATLAB ?!)
(Alternatif: gunakan MATLAB ?!)
n
n
W.R. Evan mengembangkan metoda untuk mencari
W.R. Evan mengembangkan metoda untuk mencari
akar-akar persamaan orde tinggi : metoda Root
akar-akar persamaan orde tinggi : metoda Root
Locus.
Locus.
n
n
Root Locus: tempat kedudukan akar-akar persamaan
Root Locus: tempat kedudukan akar-akar persamaan
karakterstik dengan K = 0 sampai K = tak hingga.
karakterstik dengan K = 0 sampai K = tak hingga.
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Bab
Bab 5: 5: Root Root Locus Locus EL303: Sistem EL303: Sistem KendaliKendali
Ì
Ì
DASAR ROOT LOCUS
DASAR ROOT LOCUS
Persamaan Karakteristik: s
Persamaan Karakteristik: s
22+ 2s + K =0
+ 2s + K =0
Akar-akar Persamaan Karakteristik :
Akar-akar Persamaan Karakteristik :
ss== −− ±22± 44−−44K K = −= − ±± −− K K 2 2 11 11
K
K
ss
11ss
220
0
0
0
-2
-2
1
1
-1
-1
-1
-1
2
2
-1+j1
-1+j1
-1+j1
-1+j1
10
10
-1+j3
-1+j3
-1+j3
-1+j3
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Bab
Bab 5: 5: Root Root Locus Locus EL303: Sistem EL303: Sistem KendaliKendali
n
n
Root Locus mempunyai sifat simetri terhadap sumbu
Root Locus mempunyai sifat simetri terhadap sumbu
nyata.
nyata.
n
n
Root Locus bermula dari pole-pole G(s)H(s) (untuk
Root Locus bermula dari pole-pole G(s)H(s) (untuk
K=0) dan berakhir di zero-zero G(s)H(s) (untuk
K=0) dan berakhir di zero-zero G(s)H(s) (untuk
K
K
→∞
→∞
) termasuk zero-zero pada titik takhingga.
) termasuk zero-zero pada titik takhingga.
n
n
Root Locus cukup bermanfaat dalam desain sistem
Root Locus cukup bermanfaat dalam desain sistem
kendali linear karena Root Locus dapat menunjukkan
kendali linear karena Root Locus dapat menunjukkan
pole-pole dan zero-zero loop terbuka mana yang
pole-pole dan zero-zero loop terbuka mana yang
harus diubah sehingga spesifikasi unjuk kerja sistem
harus diubah sehingga spesifikasi unjuk kerja sistem
dapat dipenuhi.
dapat dipenuhi.
n
n
Pendekatan desain melalui Root Locus sangat cocok
Pendekatan desain melalui Root Locus sangat cocok
diterapkan untuk memperoleh hasil secara cepat.
diterapkan untuk memperoleh hasil secara cepat.
n
n
Sistem kendali yang membutuhkan lebih dari 1
Sistem kendali yang membutuhkan lebih dari 1
parameter untuk diatur masih dapat menggunakan
parameter untuk diatur masih dapat menggunakan
pendekatan Root Locus dengan mengubah hanya 1
pendekatan Root Locus dengan mengubah hanya 1
parameter pada satu saat.
parameter pada satu saat.
n
n
Root Locus sangat memudahkan pengamatan
Root Locus sangat memudahkan pengamatan
pengaruh variasi suatu parameter (K) terhadap letak
pengaruh variasi suatu parameter (K) terhadap letak
pole-pole.
pole-pole.
n
n
Sketsa Root Locus secara manual tetap dibutuhkan
Sketsa Root Locus secara manual tetap dibutuhkan
untuk dapat memahaminya dan untuk memperoleh
untuk dapat memahaminya dan untuk memperoleh
idea dasar secara cepat, meskipun MATLAB dapat
idea dasar secara cepat, meskipun MATLAB dapat
melakukannya secara cepat dan akurat.
melakukannya secara cepat dan akurat.
n
n
Spesifikasi transient (koefisien redaman) dapat
Spesifikasi transient (koefisien redaman) dapat
ditentukan dengan mengatur nilai K melalui Root
ditentukan dengan mengatur nilai K melalui Root
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Bab
Bab 5: 5: Root Root Locus Locus EL303: Sistem EL303: Sistem KendaliKendali
Ì
Ì
PLOT ROOT
PLOT
ROOT LOCUS
LOCUS
Persamaan Karakteristik:
Persamaan Karakteristik: 1
1 +
+ G(s)H(s
G(s)H(s)
) =
= 0
0
Atau:
Atau:
G(s)H(s) = -1,
G(s)H(s) = -1,
Sehingga:
Sehingga:
⊃
⊃
G(s)H(s) =
G(s)H(s) =
!!
180
180
00(2k+1);
(2k+1); (syarat
(syarat sudut)
sudut)
k = 0, 1, 2, ….
k = 0, 1, 2, ….
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Bab
Bab 5: 5: Root Root Locus Locus EL303: Sistem EL303: Sistem KendaliKendali
Ì
Ì
PROSEDUR PENGGAMBARAN
PROSEDUR PENGGAMBARAN
ROOT LOCUS
ROOT LOCUS
1.
1. Letakkan pole-
Letakkan pole-pole dan zero-zero loop terbuka pada
pole dan zero-zero loop terbuka pada
bidang s.
bidang s.
2.
2. Tentukan Root Locus pada sumbu
Tentukan Root Locus pada sumbu nyata.
nyata.
••
Syarat Sudut:
Syarat Sudut:
⊃
⊃
G(s)H(s) =
G(s)H(s) =
!!
180
180
00(2k+1); k
(2k+1);
k =
= 0,
0, 1,
1, 2,
2, ….
….
••Ambil titik test : bila jumlah total pole dan zero
Ambil titik test : bila jumlah total pole dan zero
dikanan titik ini ganjil, maka titik tsb terletak di Root
dikanan titik ini ganjil, maka titik tsb terletak di Root
Locus.
Locus.
3. Tentukan asimtot Root Locus:
3. Tentukan asimtot Root Locus:
••
Banyaknya asimtot = n – m
Banyaknya asimtot = n – m
n =
n = banyaknya
banyaknya pole loop
pole loop terbuka
terbuka
m= banyaknya zero loop terbuka
m= banyaknya zero loop terbuka
••
Sudut-sudut asimtot =
Sudut-sudut asimtot =
m
m
n
n
1)
1)
(2k
(2k
180
180
00−
−
+
+
±
±
k=0, 1, 2, …
k=0, 1, 2, …
••
Titik Potong asimtot-asimtot pada sumbu nyata:
Titik Potong asimtot-asimtot pada sumbu nyata:
(
(
letak
letak
pole
pole
berhingga
berhingga
)
)
−
−
(
(
letak
letak
zero
zero
berhingga
berhingga
))
=
=
∑
∑
∑
∑
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Bab
Bab 5: 5: Root Root Locus Locus EL303: Sistem EL303: Sistem KendaliKendali
4.
4. Tentukan titik-titik break-away dan titik-
Tentukan titik-titik break-away dan titik-titik break-in:
titik break-in:
Untuk Persamaan Karakteristik:
Untuk Persamaan Karakteristik:
B(s) + KA(s) = 0,
B(s) + KA(s) = 0,
Maka titik-titik tsb harus berada di Root Locus dan
Maka titik-titik tsb harus berada di Root Locus dan
memenuhi persamaan:
memenuhi persamaan:
0
0
))
((
))
((
))
((
))
((
))
((
2 2 '' ''=
=
−
−
−
−
=
=
ss
A
A
ss
A
A
ss
B
B
ss
A
A
ss
B
B
ds
ds
dK
dK
5. Tentukan sudut-sudut datang / sudut-sudut berangkat
5. Tentukan sudut-sudut datang / sudut-sudut berangkat
untuk pole-pole / zero-zero kompleks sekawan.
untuk pole-pole / zero-zero kompleks sekawan.
••
Sudut datang (dari suatu pole kompleks) = 180
Sudut datang
(dari suatu pole kompleks) = 180
00–
–
(jumlah sudut vektor-vektor dari pole-pole lain ke pole
(jumlah sudut vektor-vektor dari pole-pole lain ke pole
kompleks tsb) +
kompleks tsb) + ( jumlah sudut vektor
( jumlah sudut vektor-vektor da
-vektor dari zero-
ri
zero-zero ke pole kompleks tsb).
zero ke pole kompleks tsb).
••
Sudut pergi
Sudut pergi (ke suatu zero kompleks) = 180
(ke suatu zero kompleks) = 180
00– (jumlah
– (jumlah
sudut vektor-vektor dari zero-zero lain ke zero
sudut vektor-vektor dari zero-zero lain ke zero
kompleks tsb) +
kompleks tsb) + ( jumlah sudut vektor-ve
( jumlah sudut vektor-vektor dari
ktor dari pole-
pole-pole ke zero kompleks tsb).
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Bab
Bab 5: 5: Root Root Locus Locus EL303: Sistem EL303: Sistem KendaliKendali
6. Tentukan batas kestabilan mutlak sistem (K):
6. Tentukan batas kestabilan mutlak sistem (K):
••
Melalui Kriteria Routh Hurwitz.
Melalui Kriteria Routh Hurwitz.
••
Secara analitis: memotong sumbu imajiner: s = j
Secara analitis: memotong sumbu imajiner: s = j
7.
7. Sketsa Root Locus secara lebih teliti
Sketsa Root Locus secara lebih teliti pada daerah-
pada
daerah-daerah selain sumbu nyata dan asimtot.
daerah selain sumbu nyata dan asimtot.
8.
8. Tentukan letak pole-p
Tentukan letak pole-pole melalui nilai K yang
ole melalui nilai K yang
memenuhi syarat magnitude. Sebalikya, bila letak
memenuhi syarat magnitude. Sebalikya, bila letak
pole-pole ditentukan (pada Root Locus), maka nilai K yang
pole ditentukan (pada Root Locus), maka nilai K yang
memenuhi dapat dihitung secara grafis atau secara
memenuhi dapat dihitung secara grafis atau secara
analitis:
analitis:
Secara grafis:
Secara grafis:
zero
zero
--zero
zero
ke
ke
ss
titik
titik
dari
dari
garis
garis
--garis
garis
panjang
panjang
perkalian
perkalian
pole
pole
--pole
pole
ke
ke
ss
titik
titik
dari
dari
garis
garis
--garis
garis
panjang
panjang
perkalian
perkalian
K
K
=
=
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Bab
Bab 5: 5: Root Root Locus Locus EL303: Sistem EL303: Sistem KendaliKendali
CONTOH :
CONTOH :
Gambarkan Root Locus sistem balikan satuan dengan Gambarkan Root Locus sistem balikan satuan dengan
)) 2 2 )( )( 1 1 (( )) (( + + + + = = ss ss ss K K ss G G
Tentukan juga nilai K agar koefisien redaman pole-pole kompleks sekawan loop Tentukan juga nilai K agar koefisien redaman pole-pole kompleks sekawan loop tertutup dominannya bernilai 0,5.
tertutup dominannya bernilai 0,5.
Solusi : Solusi :
1.
1. Tentukan Tentukan Root Root Locus Locus pada pada sumbu sumbu nyata.nyata.
Untuk titik uji 1 : Untuk titik uji 1 :
Syarat sudut : Syarat sudut : 00 00 00 00 0 0 0 0 0 0 0 0 )) 2 2 (( )) 1 1 (( ++ −−∠∠ ++ == ++ ++ == ∠ ∠ − − ∠ ∠ −
− ss ss ss (tak terpenuhi).(tak terpenuhi).
Untuk titik uji 2 : Untuk titik uji 2 :
Syarat sudut :
Syarat sudut :−−∠∠ss−−∠∠((ss++11))−−∠∠((ss++22))== −−18018000 −−0000 −−0000 == −−18018000(terpenuhi).(terpenuhi).
2.
2. Penentuan Penentuan asimtot asimtot Root Root LocusLocus
Banyaknya asimtot = banyaknya pole (n) – banyaknya zero (m) = 3 - 0 = 3 Banyaknya asimtot = banyaknya pole (n) – banyaknya zero (m) = 3 - 0 = 3
σ σ j jωω 0 0 --11 -2 -2 •• •• Titik uji 1 Titik uji 1 Titik uji 2 Titik uji 2
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Bab
Bab 5: 5: Root Root Locus Locus EL303: Sistem EL303: Sistem KendaliKendali
0 0 1 1 )) 2 2 )( )( 1 1 ((ss++ ss++ ++ == ss K K atau )
atau K K == −−((ss33 ++33ss22 ++22ss), sehingga:, sehingga:
0 0 )) 2 2 6 6 3 3 (( 22 ++ ++ == − − = = ss ss ds ds dK dK Diperoleh
Diperoleh ss11 ==−−00,,42264226 (memenuhi) dan(memenuhi) dan ss22 == −−11,,57745774 (tak memenuhi)(tak memenuhi)
4. Penentuan batas kestabilan sistem menggunakan kriteria Routh Hurwitz. 4. Penentuan batas kestabilan sistem menggunakan kriteria Routh Hurwitz.
K K33 K K 6 6 K K 3 3 2 2 1 1 0 0 1 1 2 2 3 3 − − ss ss ss ss
Syarat stabil tercapai bila 0 < K < 6. Bila dihitung, perpotongan Root Locus Syarat stabil tercapai bila 0 < K < 6. Bila dihitung, perpotongan Root Locus dengan
dengan sumbu sumbu khayal khayal ini ini terjadi terjadi pada pada : : ss == ±± j j 22..
Cara lain untuk mengetahui titik potong ini adalah secara analisis: s = j
Cara lain untuk mengetahui titik potong ini adalah secara analisis: s = jωω(pada(pada sumbu khayal).
sumbu khayal).
5.
5. Tentukan beberapa Tentukan beberapa titik uji dekat titik uji dekat titik pencar yang titik pencar yang memenuhi syarat memenuhi syarat sudut Rootsudut Root Locus agar diperoleh plot Root Locus secara akurat.
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Bab
Bab 5: 5: Root Root Locus Locus EL303: Sistem EL303: Sistem KendaliKendali
6.
6. Gambar Gambar Root Root Locus Locus nya:nya:
7.
7. Penentuan letak Penentuan letak pole-pole pole-pole kompleks kompleks sekawan sekawan dominan dominan yang yang memiliki memiliki koefisienkoefisien
redaman 0,5. Anggap pole kompleks sekawan
redaman 0,5. Anggap pole kompleks sekawan ss== −−ζωζωnn ±± j jωωnn 11−−ζζ22 . Dengan. Dengan memperhatikan gambar dibawah ini, maka terlihat bahwa
memperhatikan gambar dibawah ini, maka terlihat bahwa ζζ ==ccooss . ββ. UUnnttuuk k
,, 5 5 ,, 0 0 = =
ζζ makamaka ββ== 606000. Dengan menggunakan cara analitis akan diperoleh pole-. Dengan menggunakan cara analitis akan diperoleh pole-pole dominan tersebut adalah :
pole dominan tersebut adalah : s s = -0,3337 + = -0,3337 + j0,5780, dengan nilai K adalah:j0,5780, dengan nilai K adalah:
0383 0383 ,, 1 1 )) 2 2 )( )( (( ++ ++ 00,,33373337 00,,57805780 == = = ss ss ss ss==−− ++jj K K
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Bab
Bab 5: 5: Root Root Locus Locus EL303: Sistem EL303: Sistem KendaliKendali
Ì
Ì
BEBERAPA CATATAN
BEBERAPA CATATAN
••
Konfigurasi pole-zero yang sedikit bergeser dapat
Konfigurasi pole-zero yang sedikit bergeser dapat
mengubah total bentuk Root Locus.
mengubah total bentuk Root Locus.
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Bab
Bab 5: 5: Root Root Locus Locus EL303: Sistem EL303: Sistem KendaliKendali
Ì
Ì
ROOT LOCUS MELALUI MATLAB
ROOT LOCUS MELALUI MATLAB
Root Locus
Root Locus = persamaan
= persamaan karakteristiknya,
karakteristiknya, dalam
dalam MATLAB:
MATLAB:
0
0
den
den
num
num
K
K
1
1
+
+
=
=
n n 2 2 1 1 1 1 n n n n 2 2 1 1 n n n n 2 2 1 1 m m 2 2 1 1 1 1 m m m m 2 2 1 1 m m m m 2 2 1 1p
p
p
p
p
p
ss
))
p
p
p
p
p
p
((
ss
))
p
p
ss
((
))
p
p
ss
)(
)(
p
p
ss
((
den
den
zz
zz
zz
ss
))
zz
zz
zz
((
ss
))
zz
ss
((
))
zz
ss
)(
)(
zz
ss
((
num
num
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
+
+
+
+
+
+
+
+
+
+
+
+
=
=
+
+
+
+
+
+
=
=
+
+
+
+
+
+
+
+
+
+
=
=
+
+
+
+
+
+
=
=
− − − −Perintah MATLAB untuk menggambar Root Locus (Konsep
Perintah MATLAB untuk menggambar Root Locus (Konsep
Fungsi Alih):
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Bab
Bab 5: 5: Root Root Locus Locus EL303: Sistem EL303: Sistem KendaliKendali
Cara lain penggambaran Root Locus adalah dengan
Cara lain penggambaran Root Locus adalah dengan
menggunakan arguman berikut ini :
menggunakan arguman berikut ini :
[r,K] =
[r,K] = rlocus(num,de
rlocus(num,den)
n)
[r,K] =
[r,K] = rlocus(num,de
rlocus(num,den,K)
n,K)
[r,K] =
[r,K] = rlocus(A,B,C,D
rlocus(A,B,C,D))
[r,K] =
[r,K] = rlocus(A,B,C
rlocus(A,B,C,D,K)
,D,K)
Pada layar akan tampil matriks r dan vektor penguatan K.
Pada layar akan tampil matriks r dan vektor penguatan K.
Perintah :
Perintah :
r=rlocus(num,den)
r=rlocus(num,den)
plot(r,'o')
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Bab
Bab 5: 5: Root Root Locus Locus EL303: Sistem EL303: Sistem KendaliKendali
Contoh :
Contoh :
Plot Root Locus menggunakan MATLAB suatu sistem kendali
Plot Root Locus menggunakan MATLAB suatu sistem kendali
balikan satuan:
balikan satuan:
)) 1 1 ss 4 4 ,, 1 1 ss )( )( 6 6 ss )( )( 4 4 ss (( ss )) 4 4 ss 2 2 ss (( K K )) ss (( G G 22 2 2 + + + + + + + + + + + + = =Trusted by over 1 million members
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Bab
Bab 5: 5: Root Root Locus Locus EL303: Sistem EL303: Sistem KendaliKendali
Program MATLAB nya:
Program MATLAB nya:
%---Root-Lo
%---Root-Locus --
cus ---
---num
num =
= [0
[0 0
0 0
0 1
1 2
2 4];
4];
den
den =
= [1
[1 11.4
11.4 39
39 43.6
43.6 24
24 0];
0];
rlocus(num,den)
rlocus(num,den)
Warning:Divide by zero
Warning:Divide by zero
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Bab
Bab 5: 5: Root Root Locus Locus EL303: Sistem EL303: Sistem KendaliKendali
Ì
Ì
KASUS KHUSUS
KASUS KHUSUS
]
]
Parameter K bukan penguatan loop terbuka.
Parameter K bukan penguatan loop terbuka.
]
]
Umpanbalik positif.
Umpanbalik positif.
]
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Bab
Bab 5: 5: Root Root Locus Locus EL303: Sistem EL303: Sistem KendaliKendali
]
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Bab
Bab 5: 5: Root Root Locus Locus EL303: Sistem EL303: Sistem KendaliKendali
Contoh:
Contoh:
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Bab
Bab 5: 5: Root Root Locus Locus EL303: Sistem EL303: Sistem KendaliKendali
Sistem tidak stabil untuk K > 3 (Gunakan metoda Root Hurwitz untuk Sistem tidak stabil untuk K > 3 (Gunakan metoda Root Hurwitz untuk menghitungnya!). Sistem harus distabilkan dengan umpanbalik negatif diluarnya. menghitungnya!). Sistem harus distabilkan dengan umpanbalik negatif diluarnya.
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Bab
Bab 5: 5: Root Root Locus Locus EL303: Sistem EL303: Sistem KendaliKendali
Ì
Ì
ANALISIS SISTEM KENDALI
ANALISIS SISTEM KENDALI
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Bab
Bab 5: 5: Root Root Locus Locus EL303: Sistem EL303: Sistem KendaliKendali
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