Document Type thesis Author Name Sharma, Siddharth URN etd-010509-093209 Title Application of Support Vector Machines for Damage Detection in Structures Degree MS Department Mechanical Engineering Advisors Zhikun Hou, Advisor John Sullivan, Committee Chair John R Hall, Committee Member Mikhail Dimentberg, Committee Member Keywords Statistical Pattern Recognition Online Health Monitoring Support Vector Machines Date of Presentation/Defense 2008-12-16 Availability unrestricted
Support vector machines (SVMs) are a set of supervised learning methods that have recently been applied for structural damage detection due to their ability to form an accurate boundary from a small amount of training data. During training, they require data from the undamaged and damaged structure. The unavailability of data from the damaged structure is a major challenge in such methods due to the irreversibility of damage. Recent methods create data for the damaged structure from finite element models. In this thesis we propose a new method to derive the dataset representing the damage structure from the dataset measured on the undamaged structure without using a detailed structural finite element model. The basic idea is to reduce the values of a copy of the data from the undamaged structure to create the data representing the damaged structure. The performance of the method in the presence of measurement noise, ambient base excitation, wind loading is investigated. We find that SVMs can be used to detect small amounts of damage in the structure in the presence of noise. The ability of the method to detect damage at different locations in a structure and the effect of measurement location on the sensitivity of the method has been investigated. An online structural health monitoring method has also been proposed to use the SVM boundary, trained on data measured from the damaged structure, as an indicator of the structural health condition.
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