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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2021, Vol. 42 ›› Issue (3): 224807-224807.doi: 10.7527/S1000-6893.2020.24807

• Solid Mechanics and Vehicle Conceptual Design • Previous Articles     Next Articles

Concurrent topology optimization of composite structures for considering structural damping

NI Weiyu1, ZHANG Heng2, YAO Shengwei1   

  1. 1. Centre of Public Experiment, University of Shanghai for Science and Technology, Shanghai 200093, China;
    2. School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
  • Received:2020-09-29 Revised:2020-11-13 Published:2020-12-25
  • Supported by:
    National Natural Science Foundation of China (52005337); China Postdoctoral Science Foundation (2020M681346)

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: