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Laplace Transform Methods - University of North Florida

CHAPTER 1. Laplace Transform Methods Laplace Transform is a method frequently employed by engineers. By applying the Laplace Transform , one can change an ordinary dif- ferential equation into an algebraic equation, as algebraic equation is generally easier to deal with. Another advantage of Laplace Transform is in dealing the external force is either impulsive , (the force lasts a very shot time period such as the bat hits a baseball) or the force is on and off for some regular or irregular period of time. 1. The Laplace Transform If f (t) is defined over interval [0, ), the Laplace Transform of f , denoted as f (s), is Z . b L(f ) = f (s) = e st f (t) dt 0. Our first theorem states when Laplace Transform can be performed, Theorem If f (t) is (piecewise) continuous and there are pos- itive numbers M, a such that |f (t)| M eat for all t c Then fb(s) is defined for all s > c The next result shows that Laplace Transform is unique in the sense that different continuous functions will have different Laplace trans- form.]

Laplace transform is a method frequently employed by engineers. By applying the Laplace transform, one can change an ordinary dif-ferential equation into an algebraic equation, as algebraic equation is generally easier to deal with. Another advantage of Laplace transform

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