Calculating Gain and Phase from Transfer Functions
Calculating Gain and Phase from Transfer Functions
MECH 3140 Lecture #
1
Transfer Functions
? A differential equation , , , ... = (), has as the input to the system with the output
? Recall that transfer functions are simply the Laplace Transform representation of a differential equation from input to output: () () = ()
? Therefore it can be used to find the Gain and Phase between the input and output
2
Gain and Phase
? The gain and phase are found by calculating the gain and angle of the transfer function evaluates at j
() = () = () = = -
3
Example #1 (solving the Diff Eq)
Fall 2019 Exam #1, Bonus Problem:
+ = +
= sin()
Recall we can represent a sinusoid in the following
format: = 1 =
Then taking the derivatives: = = 1
+ = 1 + 1
4
Example #1 (solving the Diff Eq)
Solving for H (which is the output):
+ 1 = + 1
2 + 12
= =
=1 2 + 12
5
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