The State transition matrix is that matrix whose product with the state vector at initial time gives the value of variable x for time t. The state transition matrix is helpful for finding controllability, general solution, observability and stability of the LTI system.
State Transition Matrix and its Properties:
As we know the output equation is given as
Taking Laplace transform of above equation we have
This is solution of state differential equation
x(t)= [SI-A]-1x(0)+ [SI-A]-1Bu(t) (b)
From above x(t) we can find output equation by replacing x(t) in output equation by its value from above equation(b)
For the given system below
The transfer function of above system is given as
This c(t) is the output of the present system, which is not equal to above y(t), as their initial conditions are not considered.
If initial conditions are zero than both y(t) and c(t) will be equal to
L-1[SI-A]-1=φ(t)…….. state transition matrix
When the input is zero i.e. u(t) =0 the State transition matrix satisfies the solution of the state equation
Solution to above equation is
y(t)=Ke-Pt+e-Pt∫ ePt Q d(t)
But [dx(t)/dt] -Ax(t)=0
Hence above equation becomes
x(t)=x(0) e At (zero input response)
The above equation is the Zero Input Response of the system.
From above equation when u(t)=0
and from zero input response we have
Then ΦK(t)= Φ(Kt)
=e(At1+At2)=eAt1 * eAt2
Φ(t2-t1) * φ(t1-t0)=e A(t2-t1) * e A(t1-t0)
Φ(t2-t1) * φ(t1-t0)= Φ(t2-t0)
- If matrix Find the state transition matrix?
Solution: The state transition matrix is given by L-1[SI-A]-1=φ(t)
Taking inverse Laplace of above, we get
2) Find φ(t) if
Solution: As we already know that L-1[SI-A]-1=φ(t)
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