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Accuracy of the half-power bandwidth method with a third-order correction for estimating damping in multi-DOF systems

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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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Authors and Affiliations

  1. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, 100084, China

    Jinting Wang, Dandan Lü, Feng Jin & Chuhan Zhang

Authors
  1. Jinting Wang
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  2. Dandan Lü
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  3. Feng Jin
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  4. Chuhan Zhang
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Corresponding author

Correspondence to Jinting Wang.

Additional information

Supported by: National Natural Science Foundation under Grant No. 51179093, National Basic Research Program of China under Grant No. 2011CB013602, and Program for New Century Excellent Talents in University under Grant No. NCET-10-0531

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Wang, J., Lü, D., Jin, F. et al. Accuracy of the half-power bandwidth method with a third-order correction for estimating damping in multi-DOF systems. Earthq. Eng. Eng. Vib. 12, 33–38 (2013). https://doi.org/10.1007/s11803-013-0149-1

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  • DOI: https://doi.org/10.1007/s11803-013-0149-1

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