Research on sound radiation mechanism of rectangular cross-section shell based on noise source identification method
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To reveal the acoustic radiation mechanism of rectangular cross-section shells, a noise source identification method for irregular shells is proposed. This method decouples the fluid-structure interaction vibration by using the method of structural-finite-element coupled with fluid-boundary-element, and obtains the vibration and pressure of the shell. Subsequently, using these results as input, the noise source identification of the shell is accomplished by solving the acoustic radiation mode decomposition problem of non-uniform discrete models. Specifically, by designing a decoupling approach for the fluid-structure interaction vibration, the subsequent acoustic radiation mode decompositions can utilize the same acoustic radiation impedance matrix, thereby enhancing the computational efficiency. Utilizing this method, the main acoustic radiation forms rectangular cross-section shell and their related laws were analyzed, and the general acoustic radiation mechanism of the shell was revealed. This provides essential theoretical and technical support for the precise noise reduction of the rectangular cross-section shell.
Abstract
To reveal the acoustic radiation mechanism of rectangular cross-section shells, a noise source identification method for irregular shells is proposed. This method decouples the fluid-structure interaction vibration by using the method of structural-finite-element coupled with fluid-boundary-element, and obtains the vibration and pressure of the shell. Subsequently, using these results as input, the noise source identification of the shell is accomplished by solving the acoustic radiation mode decomposition problem of non-uniform discrete models. Specifically, by designing a decoupling approach for the fluid-structure interaction vibration, the subsequent acoustic radiation mode decompositions can utilize the same acoustic radiation impedance matrix, thereby enhancing the computational efficiency. Utilizing this method, the main acoustic radiation forms rectangular cross-section shell and their related laws were analyzed, and the general acoustic radiation mechanism of the shell was revealed. This provides essential theoretical and technical support for the precise noise reduction of the rectangular cross-section shell.