Non-destructive inspection of composite structures using modal analysis
Matthews, Timothy Stirling.
Wu, Edward M.
MetadataShow full item record
Anomalies from manufacturing variability or in-service damage are manifested as subtle differences in the inertial and stiffness matrices of otherwise identical components. Modal analysis seeks to model these constitutive relations by examining a structure's dynamic response to applied vibrations. In this investigation, characterization of anomalies in composite structures is attempted through multi-input, multi-output modal analysis. Two graphite-epoxy specimens manufactured by different processes are subjected to random excitation and frequency response functions are obtained. The dynamic behavior of the structures is compared through modal parameter extraction techniques. Dynamic solutions from a finite element model are used to validate the results. Finally, observations are made concerning the feasibility of extending the procedure to quality assurance and damage detection applications. (MM)
Showing items related by title, author, creator and subject.
MacLennan, Bruce J. (Monterey, California. Naval Postgraduate School, 1981-09); NPS-52-81-009A language's structures are some of its most important characteristics. These include the data structures -- those mechanisms that the language provides for organizing elementary data values. They also include the control ...
Keim, Clarence Howard (Monterey, California. U.S. Naval Postgraduate School, 1968-06);A complex system envisioned can accomplish a given mission with the aid of any one of several alternative structures. Each of these alternative structures (subsystems) , although capable of mission accomplishment, ...
Madachy, Raymond (2017);Modeling and simulation can help improve lawmaking processes. System dynamics is a simulation methodology for modeling continuous systems that provides a rich and integrative framework for investigating lawmaking process ...