linear systems ch4 [compatibility mode]
DESCRIPTION
LCSTRANSCRIPT
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Transition Matrix Properties
Chapter-4
EE-826 Linear Control System
College of Electrical & Mechanical Engineering
National University of Sciences & Technology (NUST)
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State Transition Matrix
Unforced Linear System
State Equation Solution
Peano Backer Series
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Peano Backer Series
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State Transition Matrix for Time Invariant Systems
kth term
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Property 4.1 State transition matrix for time invariant systems
where with guaranteed convergence
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Proof
Bounds on individual terms of matrix series
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Convergence of scalar series
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Example: Harmonic Oscillator
0 1
1 0A
= −
3A A= −
2A I= −Solution
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3A A= −4A I=
Transition Matrix2 2 3 3
.......2! 3!
At A t A te I At= + + + +
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Example: Harmonic Oscillator2 2 4 4
3 3 5 5
...........2! 4!
............3! 5!
At A t A te I
A t A tAt
= + + +
+ + +
2 4 3 5t t t t
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2 4 3 5
1 ........... ............2! 4! 3! 5!
At t t t te I A t
= − + + + − + +
.cos .sinI t A t= +
cos sin
sin cos
t t
t t
= −
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Property 4.2
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Proof
( )
( ) ( , )
t
A d
o ox t t x e xτ
σ στ
∫= Φ =
Proposed Solution
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2 3
( ) ( )
( ) ( ) ....2! 3!
t t
t
o
A d A d
x t I A d xτ τ
τ
σ σ σ σσ σ
= + + + +
∫ ∫∫
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Differentiating
( ) . ( ) ( ). ( )
( ) 0 ( ) ......2!
t t
o
A d A t A t A d
x t A t xτ τ
σ σ σ σ
+
= + + +
∫ ∫ɺ
Condition of Property 4.2
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2. ( ). ( )
( ) ( ) ............2!
t
o
A t A d
x t A t xτ
σ σ
= + +
∫ɺ
Condition of Property 4.2
Implies ( ) ( ) ( )x t A t x t=ɺ
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Example 4.3( ) ( )
( )0 0
a t a tA t
=
1 1( ) ( ) ( )
0 0A t a t a t M
= =
Solution
Property 4.2 holds
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( ) ( )
( )( )
2 3
( , )
2! 3!
tt
a d MA dMt e e e
M MI M
ττ
σ σσ σλτ
λ λλ
∫∫
Φ = = =
= + + +
2 3.....M M M= =
Property 4.2 holds
since
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Example 4.3 (contd)2 3
2 3
( , ) ...2! 3!
1 ...2! 3!
t I M
I M M
I M e Mλ
λ λτ λ
λ λλ
Φ = + + + +
= − + + + + +
= − +
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I M e Mλ= − +
Special case
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General Properties
Property 4.4
Matrix Differential Equation
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Property 4.5
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Linear state equation
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Example 4.6
Solution
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( )( ,0)
0 1
t
A
e f tt
Φ =
* ( )( ,0)
* *A
f tdt
dt
Φ =
ɺ
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Example 4.62
2
sin 1 cos( ,0) 0 ( ) .....2
0 00 0
sin 1 cos( ) .....2
0 00 0
A
tt td t
t A tdt
tt t t
A t I I
− Φ = + + + +
− = − + + + +
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( ) ( ,0)AA t I t
= − +Φ
* ( ) cos( ,0)
* *A
f t tdt
dt
+ Φ =
( ) ( ) cosf t f t t= +ɺ
Implies
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Example 4.6
sin cos( )
2
te t tf t
+ −=
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State Transition Matrix for
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Property 4.7 Composition Property
Property 4.9 Determinant of state transition matrix
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Property 4.10 Inverse of state transition matrix
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Example 4.11
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Example 4.11
Alternate Solution using Property 4.5
0 0( , ) ( , )TTAA t t t t−Φ = Φ
implies (0, ) ( ,0)T
T
A At t−Φ = Φ
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State Variable Changes
State transformation
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State Variable Changes
Property 4.13 Transition matrix for transformed states
Example 4.14
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Example 4.14
Proposed state transformation
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State Variable Changes
Example 4.14 (contd)
Integrating both sides
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Discrete-time State Equations
Chapter-20
EE-826 Linear Control System
College of Electrical & Mechanical Engineering
National University of Sciences & Technology (NUST)
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State Equation Solution
( 1) ( ) ( ) ( ) ( )x k A k x k B k u k+ = +
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State Equation Solution
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Transition Matrix Properties
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Transition Matrix Properties
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Transition Matrix Properties
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