Laplace Properties

Laplace Properties:

Laplace transforms have the following Laplace Properties.

(a) Superposition Property:

The first Laplace Properties is Superposition Property. The Laplace transform of the sum of the two or more functions is equal to the sum of transforms of the individual function,

i.e. if

Laplace Properties

Consider two functions f1(t) and f2(t). The Laplace transform of the sum or difference of these two functions is given by

(b)Linearity property:

The first Laplace Properties is Linearity Property. If K is a constant, then

Laplace Properties

Consider a function f(t) multiplied by a constant K. The Laplace transform of this function is given by

If we can use these two properties jointly, we have

Laplace Properties

Laplace Transform of Some Useful Functions:

(i) The unit step function f(t) = u(t)

where

Laplace Properties

(ii) Exponential function f(t) = e-at

(iii) The cosine function: cos ωt

(iv) The sine function: sin ωt

Laplace Properties

(v) The function tn, where n is a positive integer

Laplace Properties

Similarly,

By taking Laplace transformations of tn-2, tn-3,…. and substituting in the above equation, we get

(vi) The hyperbolic sine and cosine function

Laplace Properties

Similarly,

Updated: February 13, 2020 — 11:33 pm