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I was solving a Transfer function problem with multiple input variables. I decided to draw a simplified block diagram of the function but I cannot find any resources that point me to this specific situation.

input variables y and k, output variable t

y" - 5k = t

Laplace Transform would indicate 2 transform functions G1 and G2 assuming zero initial conditions.

s2 Y - 5s K = T

G1 = Y/T = 1/s2

G2 = K/T = -1/5s

Due to the function having two input variables, would the block diagram result in having two blocks that join together in parallel?

Meaning Transfer function of the above equation is... G = G1 + G2 = 5-s / 5s2

Is my reasoning sound? if not, could anyone point me to resources that do?

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  • $\begingroup$ Mostly the state space models are built from the fist formula $\endgroup$
    – joojaa
    Commented Mar 10, 2023 at 16:07
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    $\begingroup$ G1 and G2 are not in parallel since their inputs are not the same signal. Also, is the first equation y'' - 5k or y'' - 5k' ? Also, if t is the output variable, why is the transfer function Y/T instead of T/Y ? $\endgroup$
    – AJN
    Commented Mar 10, 2023 at 16:59

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