Structural dynamics is an area that covers experimental, analytical, and computational methods for determining the response of structures to dynamic environments. Structural dynamics covers the theory of engineering vibration, with an emphasis on how to obtain models of real structures by finite-element-based computational techniques. It also emphasizes topics like mode superposition and frequency response, topics that play a significant role in experimental modal analysis. SD is closely related to "mechanical vibrations" textbooks with titles like Vibrations, Engineering Vibrations, and civil engineering type "structural dynamics" textbooks.