Optimized design of a low-power, high-power-density electromagnetic ultra-low frequency underwater sound source

In the field of marine acoustic information, seabed underwater sound sources that ensure continuous and stable operation hold significant application value. These sound sources are required to operate at low frequencies, with low power consumption and high power density. Electromagnetic sound sources inherently excel in low-frequency applications, as their resonant frequency is not limited by volume or mass. However, traditional electromagnetic sound sources are typically high-power, broadband devices with low electroacoustic conversion efficiency and high power consumption, making them unsuitable for scenarios where space and energy are constrained. To address this challenge, a method has been proposed to enhance the electroacoustic conversion efficiency of low-frequency electromagnetic sound sources, which is crucial for developing low-power, low-frequency electromagnetic sound sources. Multi-objective optimization of various mechanical parameters by GA genetic algorithm balances efficiency, power consumption, and weight. The maximum sound pressure level of the moving-magnet very-low-frequency sound source can reach 165 dB, with a total weight of no more than 20 kg.