Thank you, Steve.
Q1:
But in the end result which one is which. As you say that 2x2 matrix gives us four transfer functions but which one, say, is for Vo/Vi. Kindly help me with it. Thanks.
Q2:
In this method at the bottom, it says that "D" is feedforward matrix and in most cases D=0. In the example being discussed "D" is not zero, so what does it mean in the context of present example?
Q3:
Could you please also help me with this query?
Regards
PG
Q3: There is a bit of art to the process of choosing state variables. Sometimes the choice is obvious and the derivation of the equations very easy. Other times, the choice is not so easy and the derivations not so easy. One problem is determining the order of the system which reveals the number of state variables.
I think you have it correct. This is a bit of a confusing issue. I think you have to rely on their diagram as a definition of the direction of the forces. Then you have to correctly write Newton's law based on that definition. Personally, I like to define forces in one direction, but the only requirement is to define clearly and adhere to the definitions religiously. We encounter the same issue in circuit theory when we are sometimes free to define current directions or voltage polarities as we like.
In post #9 you said that there could be as many outputs as you like. Is this also applicable to number of inputs? Or, the number of inputs are dependent upon the system. Kindly help me with this. Thank you.
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