Prediction of the dynamic stiffnesses of fiber-reinforced composite thin shells based on the multilevel correction technique

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (2) : 52-58.

LI Hui1,2,ZHOU Zhengxue1,2,XUE Pengcheng1,2,HAN Qingkai1,2

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Abstract

The dynamic stiffnesses of fiber reinforced composite shells were analyzed and predicted based on the multi-level correction method.Firstly,a sinusoidal half-wave signal was used to approximate the impulse excitation signal,and the dynamic stiffnesses of the composite shell were studied based on the Love shell theory,energy method and Hamiltonian principle.Next,in order to obtain a more accurate dynamic stiffness model of the composite thin shells,the multi-level correction technique and the experimental data were employed to correct the length,radius,thickness,elastic modulus,Poisson's ratio and modal damping ratio.Finally,a T300 fiber/epoxy composite thin shell was taken as a study object and a corresponding vibration test system was set up.The pulse signal was applied by a hammer and the dynamic stiffnesses at three response points were tested by the laser speed sensor.The experimental results were compared with the calculated results.It is found that the predicted errors of the dynamic stiffnesses at the above points are less than 12.2%,which are within an acceptable range.Thus,the correctness of the proposed prediction method for dynamic stiffnesses was verified.

Key words

fiber-reinforced / composite thin shell / impulse excitation / multilevel correction / dynamic stiffness

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LI Hui1,2,ZHOU Zhengxue1,2,XUE Pengcheng1,2,HAN Qingkai1,2. Prediction of the dynamic stiffnesses of fiber-reinforced composite thin shells based on the multilevel correction technique[J]. Journal of Vibration and Shock, 2019, 38(2): 52-58

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