Abstract
In this study, the effects of cracks on the natural frequencies of a rotating Bernoulli–Euler beam are investigated using a new numerical method in which these effects can be computed simply using the transfer matrix method. The present method using the crack model of a rotating beam developed by considering the distributed mass can determine the desired number of accurate natural frequencies for rotating cracked beams regardless of the size and location of the crack, and this method can produce accurate results by using the minimum number of subdivisions. The Frobenius method is used to determine the roots of the relevant differential equation. An open crack is considered, and each crack is modeled as a rotational spring. With these assumptions, the additional bending displacement generated by the crack is formulated as a separate transfer matrix. The computed results are compared with those discussed of a previous work to demonstrate the accuracy of the proposed method. The effects of the crack on the natural frequencies of rotating beams at different rotational speeds and hub radii are investigated through a parametric study with respect to the size and location of the crack.
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Appendix
Appendix
1.1 Components of the C matrix of Eq. (33)
1.2 Components of the H matrix of Eq. (40)
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Lee, J.W., Lee, J.Y. In-plane bending vibration analysis of a rotating beam with multiple edge cracks by using the transfer matrix method. Meccanica 52, 1143–1157 (2017). https://doi.org/10.1007/s11012-016-0449-4
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DOI: https://doi.org/10.1007/s11012-016-0449-4