Try to inverse laplace transform the following equation h_0=K_p ** (1-Ts)/(1+Ts)e^(−tau s)

Kymani Hatfield

Kymani Hatfield

Answered question

2022-10-24

I'm having a problem trying to inverse laplace transform the following equation
h 0 = K p 1 T s 1 + T s e τ s
I've tried to solve this equation using the residue method and got the following.
y ( t ) = 2 K p e τ s e t / T
y ( t ) = 2 K p e τ T e t / T
And that is clearly wrong.

Answer & Explanation

Aidyn Mccarthy

Aidyn Mccarthy

Beginner2022-10-25Added 12 answers

First do polynomial division to simplify the fraction:
1 T s 1 + T s = 1 + 2 1 + T s
Now expand h0:
h 0 = K p e τ s + 2 K p 1 T s + 1 e τ s
Recall the time-domain shift property:
L ( f ( t τ ) ) = f ( s ) e τ s
L 1 h 0 = k p δ ( t τ ) + 2 k p g ( t τ )
Where g ( t ) = L 1 1 t s + 1
To take the inverse Laplace transform of this term, recall the frequency domain shift property:
L 1 f ( s a ) = f ( t ) e a t
1 T s + 1 = 1 T ( s + 1 T ) = 1 T 1 s + 1 T
Therefore the inverse Laplace transform is:
1 T e t T
Finally, putting all of it together, the full inverse Laplace transform of the original expression is:
K p δ ( t τ ) + 2 K p T e t τ T

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