Module 3 : Dynamic behavior of Chemical Processes

Lecture 2 : Laplace Transform of derivatives

III.1.8 Solution of linear ODEs using Laplace Transform

Following example illustrates the method of solving ODEs using Laplace Transform. Consider the following set of equations arisen from a modeling exercise:

(III.27)

(III.28)

With . Task is to find a solution for x(t) and y(t).

Taking Laplace Transform of eqns. (III.27) & (III.28) we obtain,

(III.29)

(III.30)

After rearrangement of the above we obtain,

(III.31)

(III.32)

Taking the inverse Laplace Transform we obtain,

(III.33)

y(t)

(III.34)