Vibrations
Consider an example of the motion of a certain spring-mass system that is modeled by the
following differential equation subject to the initial conditions:
\[
\frac{{\text d}^2 y}{{\text d}t^2} + \frac{{\text d}y}{{\text d}t}+
1.25\,y = 3\,\cos t , \qquad y(0) =2, \quad y'(0) = 3.
\]
Its solution can be broken into sum of the
transient
yc and steady state solution
U(
t)