Title page for ETD etd-10142005-135733

Type of Document Dissertation
Author Gangadharan, Sathya N.
URN etd-10142005-135733
Title Statistical system identification of structures with flexible joints
Degree PhD
Department Aerospace and Ocean Engineering
Advisory Committee
Advisor Name Title
Nikolaidis, Efstratios Committee Chair
Gürdal, Zafer Committee Member
Haftka, Raphael T. Committee Member
Heller, Robert A. Committee Member
Hughes, Owen F. Committee Member
Johnson, Eric R. Committee Member
Kapania, Robert K. Committee Member
Kaplan, Paul Committee Member
Singh, Mahendra P. Committee Member
  • Joints (Engineering) Flexibility.
  • Joints (Engineering) Design.
Date of Defense 1990-04-15
Availability restricted

The flexibility of welded joints is an important issue in design of car bodies. Two generic, 3-D, design-oriented models (simple and complex) are developed to represent the compliant behavior of multibranch flexible joints. The simple model consists of torsional springs restraining the relative rotation of the joint branches in the three planes, while all branches are assumed to be rigidly connected in translation. Coupling between motions in different planes is neglected. The complex model accounts for such coupling. A statistical system identification method is proposed for inferring the model parameters from the static response of the structure. The method is demonstrated by applying it to a simple cube frame structure and a car body. Finally, the two models are compared in terms of their ability to predict static response.

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