考虑阻尼性能的复合结构多尺度拓扑优化设计

doi:10.7527/S1000-6893.2020.24807

Abstract

Abstract: For the purpose of reducing vibration of thin-walled structures, the use of damping material is one of the most effective and robust approaches. Damping performance of the thin-walled damping composite structures mainly depends on the damping material layout and its material physical properties. This paper proposes a concurrent topology optimization method for the design of the thin-walled damping composite structures based on non-proportional damping model. In this method, both the microstructural configurations and their macroscopic distribution are optimized in an integrated manner. In order to maximize the structural damping performance, the single-objective and multi-objective concurrent topology optimization problem are studied. The results show that, for the single objective design, when the k-th modal loss factor is set to be the objective function, the damping at k-th Eigen mode is maximum and the amplitude of frequency response function at the k-th natural frequency is minimum. However, the multi objective design obtains a better equilibrium in the lowest 3 modes and shows good vibration performance in the 1-3 modes. From the microstructure layout, it can be found that the optimal microstructure has relatively great loss moduli and high material loss factor, and it also presents a negative Poisson’s ratio. The structural vibration performance of the optimal composite structure is significantly improved.

Key words: composite structure, thin-wall structure, topology optimization, multi-scale design, damping performance

CLC Number:

TB383.4

NI Weiyu, ZHANG Heng, YAO Shengwei. Concurrent topology optimization of composite structures for considering structural damping[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021, 42(3): 224807-224807.

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Concurrent topology optimization of composite structures for considering structural damping

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