甚低频声源用新型电磁驱动结构的建模与分析

Investigation and Modeling of Innovative Electromagnetic Actuation Mechanisms for Ultra-Low Frequency Acoustic Emission

摘要:

针对适装于无人反水雷平台的扫雷声源要求结构紧凑、输出位移大、甚低频辐射能力强的特点，提出一种可模块化组装的新型电磁驱动结构。该驱动结构具有结构简单、输入-输出线性化、驱动力电流比高等优点。在分析该新型电磁驱动结构运行原理的基础上，建立了其等效磁路模型，进一步根据单自由度带阻尼受迫振动模型建立了新型电磁驱动结构的动力学模型。为验证等效磁路模型及动力学模型的正确性，建立了该驱动结构的有限元仿真模型，将仿真所得的电磁力及输出位移与基于等效磁路的仿真模型结果进行对比，有限元分析结果和磁路分析结果较好吻合，证明了所建模型的准确性。进一步根据声辐射模型计算得到声源在30~200Hz激励下输出声源级，计算结果表明，所提出的新型电磁驱动结构驱动的甚低频声源在70Hz谐振频率下，输出声源级可达185dB，在30~200Hz频带内输出声源及均大于145dB，能够满足甚低频大功率输出的要求，且通过模块化组装能够实现高声源级输出，可为新型扫雷声源的设计提供理论支撑。

关键词:扫雷声源;甚低频;电磁驱动;电磁力;

Abstract:

In response to the needs of unmanned anti-mine platforms, we have proposed a novel electromagnetic drive structure designed to achieve a compact structure, large displacement output, and powerful very low frequency (VLF) radiation capabilities. This structure is distinguished by its simple design, linearization of input and output, and a high driving force-to-current ratio. Based on the operating principles of the electromagnetic drive structure, we have established an equivalent magnetic circuit model and further developed a dynamic model. The accuracy of these models was verified through a finite element simulation model, with simulation results matching theoretical predictions. Under excitation from 30 to 200 Hz, the sound source level of the new electromagnetic drive structure exceeds 145 dB, reaching 185 dB at the resonant frequency of 70 Hz. This meets the requirements for high-power VLF output and, through modular assembly, achieves a high sound source level output, providing theoretical support for the design of new mine-sweeping sound sources.

Key words:minesweeper sound source;ultra-low frequency;electromagnetic drive;electromagnetic force