Electromagnetic underwater acoustic transducer based on gas spring and control method

Abstract

The invention provides an electromagnetic underwater acoustic transducer based on a gas spring and a control method. The underwater acoustic transducer comprises a cylinder, a radiating piece and a sealing piece forming a water-tight space. An armature and a magnetism conducting base are contained inside the water-tight space. The magnetism conducting base and the armature are wound by a first driving coil and a second driving coil respectively. The first driving coil and the second driving coil are powered by independent alternating current power sources so that one end of the magnetic conducting base and one end of the armature can generate identical or opposite magnetic poles, and the two components vibrate through electromagnetic repulsive force or electromagnetic attraction. The portion between the magnetism conducting base and the armature is filled with gas as the gas spring for balancing hydrostatic pressure and supplying rigidity needed by vibration. In the front-stage vibration period, drive current is controlled to generate electromagnetic repulsive force to push the armature to move from the initial balance position, and at the later vibration period, electromagnetic attraction is mainly relied on to pull back the armature to the balance position. The electromagnetic thrust is larger, the vibration amplitude is larger, and the purposes that the size is small, the weight is low, and high-power ultra-low frequency sound wave output is generated are achieved.

Description

technical field [0001] The invention relates to an electromagnetic (reluctance variable) underwater acoustic transducer based on a gas spring and a control method, in particular to an ultra-low frequency high-power electromagnetic underwater acoustic transducer device for ocean detection. Background technique [0002] Today's ocean detection mainly relies on sound waves, and the propagation distance of sound waves in the sea is closely related to the frequency. The lower the frequency of sound waves, the farther they can travel in water. The low-frequency and high-power underwater acoustic transducers currently used with active materials as the core work at a frequency above 300 Hz, which has a large attenuation in water and low energy transfer efficiency. For the application requirements of lower frequency bands (such as the ultra-low frequency band below 100 Hz), the size, weight and cost of these transducers will become very large. However, the dynamic and explosive ultr...

AI Technical Summary

Problems solved by technology

[0003] The problem to be solved by the present invention is to provide an electromagnetic underwater acoustic transducer based on gas springs for the problems of large size, low power and weak radiation of traditional low-frequency transducers

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