A numerical method for seeking the relationship between structural modes and acoustic radiation modes of complicated structures

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

Chang-Wei, Su^1 ; Hai-Chao, Zhu^1 ; Chang-Geng, Shuai^1 ; Rong-Fu, Mao^1

National Key Laboratory on Ship Vibration and Noise, Naval University of Engineering, Wuhan

430033, China^1

关键词: Acoustic radiation modes;    Complicated structures;    Corresponding relations;    Governing equations;    Radiated sound power;    Structural mode shape;    Structure borne sound;    Truncated conical shell;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/744/1/012182/pdf
DOI  :  10.1088/1742-6596/744/1/012182

来源: IOP

【 摘 要 】

Both structural modes and acoustic radiation modes play important roles in the investigation of structure-borne sound. However, little work has been done for inherent relations between these two kinds of modes. Previous work has mainly dealt with simple and regular structures such as rectangular plates and single-layer cylindrical shells. Therefore, the relationship between structural modes and acoustic radiation modes of complicated structures which has great theory significance and utility value is an important problem that must be studied. This paper presents a numerical method for seeking the relationship between structural modes and acoustic radiation modes of complicated structures. First, a governing equation for relating these two kinds of modes is given based on the characteristics of the modes. Then, substitute the normal structural mode shape matrix and the acoustic radiation mode shape matrix which are obtained by FEM into the governing equation, the modal participating coefficients can be solved, thus we can get the corresponding relations between these two kinds of modes. Using the model of a simply supported truncated conical shell, a numerical example is presented with the numerical method which this paper has proposed. And then, the radiated sound power is calculated to verify the effectiveness of this method and the correctness of this conclusion. The results show that the numerical method proposed in this paper is feasible.