Effects of axial force on coupling loss factor of beam structures

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (17) : 24-30.

HU Wanlu1, CHEN Haibo2, ZHONG Qiang2

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Abstract

Here, the point impedance method was used to analyze high frequency vibration transfer characteristics of coupled beam structures subjected to axial force. Considering beam structure coupling and excitation frequency varying, effects of axial force on beam structure vibration equation was analyzed, and the coupling loss factor at the coupled boundary was calculated. The "line-beam" model was used to calculate effects of temperature variation on transfer characteristics between beams. The correctness of the point impedance method was verified by comparing its calculation results with those of the finite element method. Results showed that when the out-of-plane bending wave is incident, axial force has an obvious effect on transfer characteristics between beam structures, but this effect decreases gradually with increase in excitation frequency; temperature obviously affects the coupling loss factor between beams, with increase in temperature, power transfer between beam structures weakens.

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coupled beam structure / point impedance approach / high-frequency vibration / axial force / thermal environment / coupling loss factor

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HU Wanlu1, CHEN Haibo2, ZHONG Qiang2. Effects of axial force on coupling loss factor of beam structures[J]. Journal of Vibration and Shock, 2020, 39(17): 24-30

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