How to Calculate ZIR for a Given Differential Equation?

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SUMMARY

The discussion focuses on calculating the Zero Input Response (ZIR) for the differential equation 2y' + 3y = 2x' + x(t-1) with the initial condition y(0-) = 5. Participants emphasize the necessity of applying the Laplace transform to derive the transfer function H(s) = Y/X. The correct approach involves solving the homogeneous equation 2y' + 3y = 0 for the ZIR, while the complete response is the sum of the ZIR and the zero state response derived from the non-homogeneous equation.

PREREQUISITES
  • Understanding of Laplace transforms and their properties
  • Familiarity with solving first-order linear differential equations
  • Knowledge of system response concepts, including Zero Input Response (ZIR)
  • Ability to manipulate transfer functions in the s-domain
NEXT STEPS
  • Study the properties of Laplace transforms in detail
  • Learn how to solve homogeneous and non-homogeneous differential equations
  • Explore the concept of system responses, focusing on Zero Input and Zero State Responses
  • Practice deriving transfer functions from differential equations
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Students and professionals in engineering, particularly those studying control systems, signal processing, or differential equations, will benefit from this discussion.

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Homework Statement


Calculate ZIR(t) for the system described for the following differential equation, where the initial condition is y(0-) = 5:


Homework Equations


2y' + 3y = 2x' + x(t-1)


The Attempt at a Solution


I'm pretty sure we're supposed to laplace-transform it, then find Y/X = H(s) then inverse back to time domain.
2*(s*Y - 5) + 4*Y = 2*(s*X) + X*exp(-s)
cannot be solved for Y/X, which makes me think I somehow messeed up the initial transform, or perhaps the method altogether
 
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MooseBoys said:

Homework Statement


Calculate ZIR(t) for the system described for the following differential equation, where the initial condition is y(0-) = 5:


Homework Equations


2y' + 3y = 2x' + x(t-1)


The Attempt at a Solution


I'm pretty sure we're supposed to laplace-transform it, then find Y/X = H(s) then inverse back to time domain.
2*(s*Y - 5) + 4*Y = 2*(s*X) + X*exp(-s)
cannot be solved for Y/X, which makes me think I somehow messeed up the initial transform, or perhaps the method altogether
For the ZIR you must have no imput. So, you must solve
2y´ + 3 y = 0 with y(0) = 5
For the zero state response you solve
2y´ + 3y = 2x´+ x(t-1)
The complete response is the sum of the two.
 

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