Prediction of the fatigue life of acoustic black hole beams under random excitation

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (10) : 37-43.

WEI Caifeng1，DU Weiqi1，QIU Xiaobiao2

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Abstract

From an analytical perspective, a numerical model of acoustic black hole beams under random excitation was established for the cantilever beam structure of acoustic black holes (ABH) with truncated thickness, using random loads and four typical load spectra. Fatigue reliability analysis was conducted. The results indicate that the deviation of feature frequency and the accuracy of displacement PSD prediction are within the acceptable error range for engineering applications. The variation of vibration fatigue life in the ABH region varies with different load spectra, and the safest point is the tip position of the ABH beam. The minimum vibration life of a uniform beam is significantly higher than that of an ABH beam. In addition, it is not that the larger the truncation thickness h_0, the smaller the acoustic black hole radius r_ABH, and the safer the ABH beam. This is also related to the random vibration load spectrum, and different types of load spectra have different effects on the variation of beam vibration fatigue life.

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Acoustic Black Bole beam / random excitation / vibration analysis / fatigue life prediction

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WEI Caifeng1，DU Weiqi1，QIU Xiaobiao2. Prediction of the fatigue life of acoustic black hole beams under random excitation[J]. Journal of Vibration and Shock, 2024, 43(10): 37-43

References

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