EXPERIMENTAL VALIDATION OF THE USE OF RESPONSE ESTIMATION METHOD IN FATIGUE LIFE PREDICTION OF TUNED MASS DAMPER

Date

2025-12-1

Author

Gültekin, Ece Nur

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This thesis investigates the applicability of a response estimation method for predicting the dynamic behavior and fatigue performance of a tuned vibration absorber (TVA) attached to a simple aluminum beam. The proposed approach combines finite element modeling and spectral response estimation methods to evaluate whether an uncoupled-FRF-based procedure can replace or significantly reduce the need for full structure simulations in fatigue life assessment. Two attachment configurations, thin and thick, were examined to study the influence of connection rigidity and added mass on TVA tuning and estimation accuracy. In each case, a cantilever-type TVA was designed and tuned to the first natural frequency of the host beam, with the tip mass adjusted accordingly. The response estimation method predicts the full structure (Host Structure & TVA) behavior using only the uncoupled frequency response functions (FRFs) of the original beam and the TVA, together with the operational power spectral density (PSD) of the original beam structure. Numerical results show that the estimated FRFs and PSD-based responses closely match those from full structure finite element models for both single- and multiple-input excitation scenarios, demonstrating the method’s robustness and adaptability. Fatigue life predictions derived from the estimated operational PSDs were also in close agreement with those obtained from full structure FEA. These results confirm that the approach is a highly efficient and accurate alternative to conventional coupled simulations for fatigue assessment of TVA systems. Overall, the findings demonstrate that the response estimation method offers a practical, fast, and reliable tool for predicting the dynamic response and fatigue performance of TVA equipped beam like structures, enabling significant reductions in computational effort while preserving accuracy in engineering applications.

Subject Keywords

Tuned Vibration Absorber, Response Estimation Method, Fatigue Life Prediction, Finite Element Analysis, Power Spectral Density

URI

https://hdl.handle.net/11511/118474

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Graduate School of Natural and Applied Sciences, Thesis