  In this paper, we propose a method to identify the damaged component and
quantify its damage amount in a large network given its overall frequency
response. The identification procedure takes advantage of our previous work
which exactly models the frequency response of that large network when it is
damaged. As a result, the test shows that our method works well when some noise
present in the frequency response measurement. In addition, the effects brought
by a damaged component which is located deep inside that large network are also
discussed.
