Periodic curved beam structure floating raft based on wave mode conversion

Abstract

The invention relates to a periodic curved beam structure floating raft based on wave mode conversion. The periodic curved beam structure floating raft mainly comprises an upper panel, a plurality of middle periodic curved beam structures and a lower panel, wherein the plurality of the periodic curved beam structures are arranged in the length direction and the width direction of the panels side by side and periodicity is formed in each of the length direction and the width direction; in the thickness direction of the panels, the periodic curved beam structures are of the periodic structures formed by multiple layers of small panels and curved beams; when vibration is propagated along the thickness direction via the curved beams, transfer and conversion of waves can occur, the stop band characteristics of the periodic structures are formed, and the vibration can be greatly attenuated; and the small panels of all the periodic curved beam structures are connected with the upper panel and the lower panel. The floating raft provided by the invention utilizes the stop band characteristics of the periodic structures and utilizes the curved beams with a wave mode conversion effect as elastic elements for providing static stiffness and dynamic stiffness, thereby increasing vibration attenuation, realizing a wideband gap in a lower frequency band and increasing the vibration isolation performances of a low frequency band and a wide frequency band of a vibration isolation device of the floating raft.

Description

technical field [0001] The invention relates to a vibration reduction and noise reduction device for ships and submarines, more specifically, to a floating raft vibration isolation device based on curved beam structure wave mode conversion and periodic structure stop band characteristics. Background technique [0002] As an important category of naval equipment, submarines are favored by navies of all countries because of their good concealment, maneuverability, and assault capabilities, which can accomplish the tasks of strategic deterrence and tactical confrontation. Concealment is the main factor determining its survival and assault capabilities. In particular, as the sonar system tends to develop in the direction of low frequency and high power, its working distance is getting farther and farther; and with the rapid development of electronic technology and signal processing technology, the identification and tracking of underwater targets by sonar systems The ability is...

AI Technical Summary

Problems solved by technology

These floating rafts do not make full use of the attenuation mechanism between the various substructures in the floating raft, the distribution of mass and stiffness is unreasonable, and it is impossible to form broadband vibration attenuation

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