Periodic curved beam structure floating raft based on wave mode conversion

A technology of structural periodicity and curved beams, applied in non-rotational vibration suppression, ships, special-purpose ships, etc., can solve problems such as inability to form broadband vibration attenuation, not fully utilizing the attenuation mechanism, and unreasonable distribution of mass and stiffness

Inactive Publication Date: 2012-10-24
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

These floating rafts do not make full use of the attenuation mechanism between the various substructures in the floating

Method used

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  • Periodic curved beam structure floating raft based on wave mode conversion
  • Periodic curved beam structure floating raft based on wave mode conversion
  • Periodic curved beam structure floating raft based on wave mode conversion

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[0020] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] like figure 1 As shown in FIG. 4 , the curved beam structure periodic floating raft based on wave mode conversion disclosed by the present invention is mainly composed of an upper panel 1 , a plurality of curved beam periodic structures in the middle, and a lower panel 3 . The upper panel 1 and the lower panel 3 are used to install the vibration isolator, which is convenient to connect with the upper and lower connectors. The upper and lower panels should be reinforced with ribs at the place where the vibration isolator or machine foot is installed. A plurality of curved beam periodic structures are arranged side by side in the length and width directions of the panel, forming periodicity in the length and width directions. In the thickness direction of the panel, the curved beam periodic structure is a peri...

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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...

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Application Information

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IPC IPC(8): F16F15/02B63G8/00
Inventor 黄修长徐时吟华宏星张志谊
Owner SHANGHAI JIAO TONG UNIV
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