ABSTRACT
In most of the first five chapters of this book, we have considered dynamics problems in which the properties of both the structure being shaken and the excitation are known explicitly, or can be estimated in a deterministic way. We have then used a variety of mathematical techniques to find the dynamic response of the structure to the excitation. In many realworld applications, however, we cannot know the exact form of the loading or the dynamic response. Unpredictable motions of this sort are known as random vibrations.
