How Can I Determine the Equivalent Transfer Function of Two Active LTI Systems?

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SUMMARY

The discussion centers on determining the equivalent transfer function of two active Linear Time-Invariant (LTI) systems, G1(s) and G2(s), that operate at different times. Participants conclude that since G1 and G2 are never active simultaneously, they cannot be combined into a single transfer function. The consensus is that the joint system becomes non-time-invariant when switching between G1 and G2, complicating the description of the system's behavior. Therefore, a traditional transfer function representation is not applicable for this scenario.

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  • Understanding of Linear Time-Invariant (LTI) systems
  • Familiarity with transfer functions in control theory
  • Knowledge of system time invariance concepts
  • Basic principles of signal processing
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Control engineers, signal processing specialists, and students studying system dynamics will benefit from this discussion, particularly those interested in the complexities of combining multiple LTI systems.

umarkhan
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hello,
If I have two LTI system in G1(s) and G2(s) and I know that for a certain fraction of the time period G1 is active and for the reminaing fraction G2 is active, then is there any method to get the equivalent transfer function ?


Umat.
 
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I would think you would just have two transfer functions. Since there G1 and G2 are never active at the same time, you can't really describe it that way. At least, I don't think there is a way. Maybe I'm wrong though.
 
If you're switching between the two systems, the joint system is no longer time-invariant. It's probably going to be not so simple.
 
I agree with Manchot. And since you can't have a transfer function for a non-LTI system, you'll have to describe it some other way.
 

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