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Response of First Order Systems to Sinusoidal InputPowerPoint Presentation

Response of First Order Systems to Sinusoidal Input

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Response of First Order Systems to Sinusoidal Input

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Response of First Order Systems to Sinusoidal Input

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Consider the following first order system:

Determine the response of the system if input is a sinusoidal:

Which may be transformed to:

the system response, O(s), is then:

Solving then for a,b, and c:

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To solve for a, multiply by s + 1/t , and let s = -1/t

To solve for b, multiply by s + iw, and let s = -iw

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c will be the complex conjugate of b and is:

Using the solution in the S&C for a sinusoidal function, the solution becomes:

,r = 0

Where:

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The complete solution is then:

It is important to note that the solution is made-up of a transient (the first term) and a non-transient part (the second term).

Consider simply substuting iw for s in the original transfer function and solving for

Note, this gives us the non-transient solution

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We can simply add terms on the Bode Magnitude plot

and on the Bode Phase plot to get total response

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