大功率超低频膜结构电磁声源振动特性研究
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1.中国船舶集团有限公司第七一〇研究所;2.湖南大学;3.国网浙江省电力有限公司杭州供电公司

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Study on vibration characteristics of high-power ultra-low frequency membrane electromagnetic sound source
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Affiliation:

1.NO.710 R&2.amp;3.D Institute,CSSC;4.Hunan University;5.State Grid Zhejiang Hangzhou Power Supply Company;6.HUNAN University

Fund Project:

The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    膜结构电磁式声源具有体积位移大、超低频声场可控、适装性佳等显著优势,在扫雷声源方面具有广阔的应用前景;辐射膜是声源核心振动部件,研究辐射膜的振动特性对于电磁声源的设计及应用具有重要意义。本文研究了一种膜结构电磁声源振动特性的解析方法。首先,建立了真空中电磁声源圆环膜自由振动的解析模型,其次,采用分离变量法求解得到真空中圆环膜自由振动的固有频率和振型,通过与文献数据对比及有限元仿真验证了理论解的正确性;然后,分析了不同边界条件下和圆环膜半径的变化对膜在真空中的振动特性的影响;最后,考虑声源实际水下工况粘性液体负载与内部填充压力的影响,得到了电磁声源实际工况中不同尺寸圆环膜低频强迫振动的幅频特性与声源振动体积位移。本文所提方法可较准确反映实际工况下电磁声源振动特性与声辐射能力,可为大功率电磁声源的设计和结构优化提供重要参考。

    Abstract:

    The electromagnetic sound source with membrane structure has the advantages of large volume displacement, controllable ultra-low frequency sound field and good adaptability, so it has broad application prospect in the field of minesweeping sound source. Radiation film is the core vibration component of sound source. It is of great significance to study the vibration characteristics of radiation film for the design and application of electromagnetic sound source. In this paper, an analytical method for the vibration characteristics of an electromagnetic sound source with membrane structure is studied. Firstly, the analytical model of the free vibration of the ring film of the electromagnetic sound source in vacuum is established. Secondly, the natural frequency and mode of the free vibration of the ring film in vacuum are obtained by using the method of separation of variables. Then, the influence of different boundary conditions and the change of the radius of the ring membrane on the vibration characteristics of the membrane in vacuum is analyzed. Finally, considering the influence of viscous liquid load and internal filling pressure, the amplitude-frequency characteristics and volume-displacement of the low frequency forced vibration of the ring film with different sizes in the actual working conditions of the electromagnetic sound source are obtained. The method presented in this paper can accurately reflect the vibration characteristics and sound radiation capacity of the electromagnetic sound source under actual working conditions, and can provide an important reference for the design and structural optimization of high-power electromagnetic sound source.

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  • 收稿日期:2023-10-10
  • 最后修改日期:2023-11-03
  • 录用日期:2023-11-14
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