Research on damping properties optimization of variable-stiffness plate

13th International Conference on Motion and Vibration Control; 12th International Conference on Recent Advances in Structural Dynamics

Wen-Kai, Qi^1,2,3 ; Xian-Tao, Yin^1 ; Cheng, Shen^1,2,3

College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing

210016, China^1

Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing

210016, China^2

Collaborative Innovation Center of Advanced Aero-Engine, Nanjing

210016, China^3

关键词: Composite laminated plates;    Discrete material optimizations;    Interpolation function;    Method of moving asymptotes;    Optimization design;    Specific damping capacity;    Stiffness and damping;    Variable stiffness;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/744/1/012114/pdf
DOI  :  10.1088/1742-6596/744/1/012114

来源: IOP

【 摘 要 】

This paper investigates damping optimization design of variable-stiffness composite laminated plate, which means fibre paths can be continuously curved and fibre angles are distinct for different regions. First, damping prediction model is developed based on modal dissipative energy principle and verified by comparing with modal testing results. Then, instead of fibre angles, the element stiffness and damping matrixes are translated to be design variables on the basis of novel Discrete Material Optimization (DMO) formulation, thus reducing the computation time greatly. Finally, the modal damping capacity of arbitrary order is optimized using MMA (Method of Moving Asymptotes) method. Meanwhile, mode tracking technique is employed to investigate the variation of modal shape. The convergent performance of interpolation function, first order specific damping capacity (SDC) optimization results and variation of modal shape in different penalty factor are discussed. The results show that the damping properties of the variable-stiffness plate can be increased by 50%-70% after optimization.