Abstract
Structural parameter identification is significantly important for condition assessment and health monitoring to ensure safety, future usefulness and to adopt effective retrofit & repair measure. System identification techniques, using inverse dynamic approach, are important tool to improve the mathematical models for structural parameter identification. However, techniques using frequency, mode shape or their derivatives are quite sensitive to the measurement noise. An analysis methodology is proposed for the structural parameter identification of the framed structure in the framework of finite element model with limited dynamic responses. The proposed dynamic responses are not feasible in all degrees of freedom. Dynamic condensation technique is adopted to take care of the limited dynamic responses measured at selected degrees of freedom experimentally. The structural properties viz. bending rigidity and mass density per unit length parameters are identified at the parameter level in the updated models of the system. Damage at the element level may be identified, by comparing the identified structural parameters of the system with those of the undamaged state. The proposed model is suitable for practical problem as it is able to identify the structural parameters with limited modal data of first few modes, assumed at selected degrees of freedom. Numerical example with various damage scenarios is exploded to demonstrate the applicability of the proposed model. The model is able to identify the structural damage with great accuracy from the noisy dynamic responses. Experimental studies establish the potential of the proposed method for its practical application in the field of structural parameter identification.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call