Accuracy of the half-power bandwidth method with a third-order correction for estimating damping in multi-DOF systems |
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| Authors: | Jinting Wang Dandan Lü Feng Jin Chuhan Zhang |
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| Institution: | 1149. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, 100084, China
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| Abstract: | A third-order correction was recently suggested to improve the accuracy of the half-power bandwidth method in estimating the damping of single DOF systems. This paper analyzes the accuracy of the half-power bandwidth method with the third-order correction in damping estimation for multi-DOF linear systems. Damping ratios in a two-DOF linear system are estimated using its displacement and acceleration frequency response curves, respectively. A wide range of important parameters that characterize the shape of these response curves are taken into account. Results show that the third-order correction may greatly improve the accuracy of the half-power bandwidth method in estimating damping in a two-DOF system. In spite of this, the half-power bandwidth method may significantly overestimate the damping ratios of two-DOF systems in some cases. |
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| Keywords: | half-power bandwidth method third-order correction damping ratio estimation error two-DOF system |
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