Optimization for composite cylindrical shells with light and weak-radiation damping sandwich

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (16) : 7-15.

WANG Shi1，ZHAO Xingqian2,3，TONG Bo4

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Abstract

The vibration and acoustic radiation of composite cylindrical shells with damping sandwich (CCSDS) activated by pointed harmonic force were studied based on Three-dimensional elastic theory (TDET). A multi-objective function optimization model was built, whose Optimization objectives were total mass, fundamental frequency and model damping. The model was used to optimize the thickness distribution of fiber and sandwich layer as well as the modes of lay-up. The effectiveness of TDET was confirmed after compared with the results of other literatures and “FE-BE” method. The influencing factors for vibration and acoustic radiation of CCSDS were analyzed. It is revealed that when the sandwich layer’s median line is higher than the whole shell’s, it is favorable for increasing the fundamental frequency and reducing acoustic radiation power. With the increasing of lay-up angle, the natural frequency changes in the shape of parabola and modal damping ratio decreases gradually. After optimization, the first modal frequency of acoustic radiation power shifts to higher frequency by 20Hz and maximum acoustic power decreases by 11.66dB. The peak value density decreases apparently in the low-frequency stage of under 200Hz.

Key words

composite cylindrical shells / damping sandwich / vibration and acoustic radiation / size optimization / lay-up optimization

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WANG Shi1，ZHAO Xingqian2,3，TONG Bo4. Optimization for composite cylindrical shells with light and weak-radiation damping sandwich[J]. Journal of Vibration and Shock, 2020, 39(16): 7-15

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