Calculate transfer function of two parallel transfer functions in a feedback loop

1. How do you combine transfer functions in parallel?
2. How do you calculate transfer function?
3. How do you multiply transfer functions?

How do you combine transfer functions in parallel?

Transfer function in parallel (forward loop)

In a parallel connection of transfer functions the same input is fed to all the transfer functions and all the outputs are summed together. The equivalent transfer function is this case is the algebraic sum of all the transfer functions.

How do you calculate transfer function?

To find the transfer function, first take the Laplace Transform of the differential equation (with zero initial conditions). Recall that differentiation in the time domain is equivalent to multiplication by "s" in the Laplace domain. The transfer function is then the ratio of output to input and is often called H(s).

How do you multiply transfer functions?

You can multiply transfer functions sys1=tf(num1,den1) and sys2 = tf(num2, den2) using sys3=sys1*sys2. you can also add them, subtract them, etc.