【摘要】 水中兵器辐射噪声源定位识别是提高水中兵器隐身性最有效最直接的手段。针对声辐射模态和声场分布可以反映声源的辐射特性,研究了基于模态叠加法的简支平板辐射声场重构。首先根据简支平板自由振动微分方程得到简支平板的固有频率和模态函数,运用声模态叠加法得到简支平板辐射声场;然后基于近场声全息声场重构模型进行简支平板辐射声场重构实验研究,得到简支平板重构面的辐射特性,并将其重构的实验结果与理论值进行对比,重建的声压与理论计算得到的结果基本吻合,验证了基于模态叠加法的简支平板辐射声场重构方法的有效性。更多还原

【Abstract】 Location identification of radiation sound source is the most effective and direct means to improve the stealth of the underwater weapons. Sound radiation modal and sound field distribution can reflect the radiation characteristics of the sound source. In this study, radiation sound field reconstruction of a simply supported panel was conducted based on the modal superposition method. According to the free vibration differential equation of the simply supported panel, the natural frequencies and vibration differential modal function were obtained, and the radiation sound field of the simply supported panel was acquired by using the sound modal superposition method. Then, a radiation sound field reconstruction experiment was conducted based on the near-field acoustic holography(NAH) sound field reconstruction model, and the radiation characteristics of the simply supported panel reconstruction surface were obtained. Experimental results were compared with the theoretical value. The reconstructed sound pressure is consistent with the theoretical one, which verifies the effectiveness of the proposed radiation sound field reconstruction method based on modal superposition method.更多还原