Underwater intelligent double-layer shell structure with vibration reduction function

Abstract

The invention discloses an underwater intelligent double-layer shell structure with a vibration reduction function, which relates to the field of underwater vehicles. A pressure-resistant shell and alight shell are connected into a whole through the solid rib plate; two ends of the pressure-resistant shell are connected with sealing end covers; a piezoelectric sensor is mounted on the inner surface of the light shell; a piezoelectric actuator is mounted on the outer surface of the light shell; the piezoelectric sensor, a charge amplifier, a data acquisition module, an active controller and the piezoelectric actuator power amplifier are mounted in the pressure-resistant shell; the piezoelectric sensor monitors a vibration signal of the light shell and transmits the vibration signal to thecharge amplifier; the charge amplifier is connected to the data acquisition module; the data acquisition module processes signals and transmits the signals to the active controller, the active controller controls the piezoelectric actuator through the piezoelectric actuator power amplifier, and underwater low-frequency vibration and sound radiation can be effectively restrained. Compared with a vibration reduction and noise reduction method for transmission, active control of vibration and noise has the advantages that the effect of restraining low frequency and broadband is achieved, and theinfluence on the physical property of a controlled structure is small.

Description

technical field [0001] The invention relates to the field of underwater vehicles, in particular to an underwater intelligent double-layer shell structure with a damping function. Background technique [0002] my country's underwater vehicles generally adopt a double-layer shell structure. The double-layer shell structure includes a pressure-resistant shell on the inside and a light shell on the outside. Compared with the single-layer shell structure, the double-layer shell structure can better protect The inner shell is not damaged, and the water storage between the single layer and the double layer can provide a large reserve buoyancy, and at the same time, it can also inhibit the medium and high frequency sound radiation to a certain extent. The main transmission path of mechanical noise of underwater vehicles based on the double-layer hull structure is: cabin-pressure hull-inter-board-light shell, so directly controlling the sound radiation caused by the vibration of the l...

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Problems solved by technology

[0005] However, both methods have certain defects: the effect of suppressing high-frequency vibration is more obvious, but because the outer shell is a light shell, the thickness of the light shell is thinner than that of the pressure shell, and the light shell is easier to transmit the low-frequency vibration of the mechanical structure in the cabin The low-frequency acoustic radiation caused by low-frequency acoustic radiation has a long wavelength and a long transmission distance, so it is easier to be detected by sonar. Therefore, low-frequency vibration becomes the main cause of acoustic radiation from underwater vehicles.

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