Inverse identification of elastic constrained stiffness of bolted&nbsp;hard-coating cylindrical shell based on MPA algorithm#br#

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (23) : 164-172.

Inverse identification of elastic constrained stiffness of bolted hard-coating cylindrical shell based on MPA algorithm#br#

LIU Xin, ZHANG Yue, YANG Jian

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Abstract

Regarding the inverse identification problem of the elastic constraint stiffness for the bolted hard-coating cylindrical shells, there still remains a challenge in effectively reducing vibration testing and time costs while maintaining high accuracy and efficiency. To address the problem, an inverse identification method is presented for the elastic constraint stiffness of the bolted hard-coating cylindrical shell, based on the Marine Predators Algorithm and modal shape identification. This method establishes a dynamic virtual prototype of the bolted hard-coating cylindrical shell and a dynamic finite element model of the elastic-constrained hard-coating cylindrical shell, by employing the ANSYS and MATLAB co-simulation technology to iteratively identify the constraint stiffness under different pretightening conditions. Numerical experimental results indicate the favorable comprehensive performance of this method in inverse identification as well as its cost-efficiency. Meanwhile, taking the NiCoCrAlY+YSZ hard-coating cylindrical shell as an example, further improvement is focused on the action pattern of constraint stiffness on the vibration characteristics of the hard-coating cylindrical shell under bolted conditions, particularly from the aspects of single-variable and multi-variable constraint stiffness influence analysis. The results demonstrate that as the constraint stiffness increases, the shell natural frequency exhibits a trend of rapid rise, followed by a gradual stabilization. When a larger stiffness value transforms the bolted elastic constraint into fixed-support constraint, and the lower circumferential wave number natural frequencies are more sensitive to the variation of constraint stiffness. The axial constraint stiffness ku has a significant impact on the shell natural frequency, while radial constraint stiffness kw and torsion constraint stiffness kt exerts relatively minor effects, and the magnitude of impact is depended on the circumferential wave number n. When the torsion constraint stiffness kt≥1×104 N∙m/rad, its impact on the natural frequency could be neglected.

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Hard-coating cylindrical shell / inverse identification / bolt connection / elastic constraint / MPA

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LIU Xin, ZHANG Yue, YANG Jian. Inverse identification of elastic constrained stiffness of bolted hard-coating cylindrical shell based on MPA algorithm#br#[J]. Journal of Vibration and Shock, 2024, 43(23): 164-172

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