We will now study dynamic systems which are subjected to sinusoidal forcing functions. Previously,
in our analysis of dynamic systems, it was necessary to determine both the unforced response (or
homogeneous solution) and the forced response (or particular solution) to the given forcing function.
In the next several modules, however, we will restrict our attention to only the system’s forced
response to a sinusoidal input; this response is commonly called the sinusoidal steady-state system
response. This analysis approach is useful if we are concerned primarily with the system’s response
after any initial conditions have died out, since we are ignoring any transient effects due to the
system’s natural response.