Laplace Transform Time Shift Property

In summary, the conversation discusses the Laplace transform property of time shifting and the question of whether it holds for T<0. The Homework Equation is provided as L{f(t-T)}=e^-sT* F(s), with a correction that it should be e^-sT instead of -aT in the exponent. The conversation concludes with a request for insight on the original problem.
  • #1
bran_1
17
0

Homework Statement


I’m being asked to prove if and why (what instances in which) T<0 for the Laplace transform property of time shifting doesn’t hold.

Homework Equations


L{f(t-T)}=e^-aT* F(s)

The Attempt at a Solution


I know that for T<0 there are instances where the property cannot hold, but I cannot think of an example where the property would fail. (I know the “if”, but not the “why”)
 
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  • #2
It should be ## e^{-sT} F(s) ## rather than (-aT) in the exponent
 
  • #3
scottdave said:
It should be ## e^{-sT} F(s) ## rather than (-aT) in the exponent
Yes, typo on my part. Its supposed to be ‘s’, the frequency domain variable, and T, the time shift.

Would you happen to have any insight to the original problem?
 

1. What is the Laplace Transform Time Shift Property?

The Laplace Transform Time Shift Property is a mathematical property that allows for the shifting of a function in the time domain to a different time in the Laplace domain. It is commonly used in signal processing and control theory.

2. How is the Laplace Transform Time Shift Property expressed mathematically?

The mathematical expression of the Laplace Transform Time Shift Property is given by: L{f(t-a)} = e^(-as)F(s), where L{} represents the Laplace Transform operator, f(t) is the function in the time domain, a is the time shift, s is the complex frequency variable, and F(s) is the Laplace Transform of f(t).

3. What is the significance of the Laplace Transform Time Shift Property?

The Laplace Transform Time Shift Property is significant because it allows for the simplification of complex functions in the time domain by shifting them to a more convenient time in the Laplace domain. This can make solving differential equations and analyzing systems much easier.

4. Can the Laplace Transform Time Shift Property be applied to any function?

Yes, the Laplace Transform Time Shift Property can be applied to any function as long as it satisfies the conditions for convergence of the Laplace Transform. This means that the function must be of exponential order, meaning it grows no faster than an exponential function as t approaches infinity.

5. How is the Laplace Transform Time Shift Property related to the Fourier Transform Time Shift Property?

The Laplace Transform Time Shift Property is a generalization of the Fourier Transform Time Shift Property. The Fourier Transform Time Shift Property only applies to functions in the frequency domain, while the Laplace Transform Time Shift Property applies to functions in the Laplace domain. The Laplace Transform Time Shift Property is more versatile and can be used in a wider range of applications compared to the Fourier Transform Time Shift Property.

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