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This report summarizes research conducted under a NASA grant on the topic 'Substructure System Identification for Finite Element Model Updating.' The research concerns ongoing development of the Substructure System Identification Algorithm (SSID Algorithm), a system identification algorithm that can be used to obtain mathematical models of substructures, like Space Shuttle payloads. In the present study, particular attention was given to the following topics: making the algorithm robust to noisy test data, extending the algorithm to accept experimental FRF data that covers a broad frequency bandwidth, and developing a test analytical model (TAM) for use in relating test data to reduced-order finite element models.

Frank H. Craig (1859-1945) was superintendent of Wethersfield (Ill.) schools from 1903 to 1918. He later moved in Vermont and wrote prose and poetry about the rural communities in which he lived. These poems reflect the author's love for nature and the people and memories that brought meaning to his life. The reader wishes to thank the <a href="https://kewanee-history.com/" target="_blank" rel="noopener noreferrer">Kewanee Historical Society</a> for providing her access to this book. (Summary by MaryAnn)