Vibration reduction metamaterial lattice sandwich beam with adjustable forbidden band frequency
A technology of metamaterials and sandwich beams, applied in girders, joists, trusses, etc., can solve problems such as limited natural frequency adjustment range, limited vibration damping effect, and inability to optimize the structural performance of vibration damping beams in multiple frequency bands. , to achieve the effect of obvious vibration reduction effect
Active Publication Date: 2022-01-28
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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Problems solved by technology
[0002]
Although lightweight sandwich structures have been widely used in practical engineering, how to control the wave propagation and vibration in these structures in the low frequency range is still a challenge.
Researchers have studied the dynamic behavior of lightweight sandwich structures, but designing lattice sandwich beams with metamaterial properties to suppress vibrations in the low frequency range has never been found in the existing literature
[0003]
In addition, existing lightweight sandwich beam structures are generally only matched to a single or narrow range of resonant bandgap
The natural frequency adjustment range of the existing beam structure element is limited, and it is difficult to design the forbidden band frequency range to the low frequency range, so the vibration reduction effect is limited, and it cannot meet the requirements of vibration reduction in multiple frequency bands and performance optimization of the beam structure
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[0032] In order to make the purpose and technical solutions of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions of the embodiments of the present application with reference to the drawings of the embodiments of the present application. Apparently, the described embodiments are some of the embodiments of the present application, but not all of them. Based on the described embodiments of the present application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.
[0033] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs. It should also be understood that terms such as those defined in c...
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The invention provides a vibration reduction metamaterial lattice sandwich beam with an adjustable forbidden band frequency. The sandwich beam comprises a first foundation beam and a second foundation beam which are arranged in parallel, and further comprises a pyramid sandwich 3 arranged between the two foundation beams, an X-shaped local oscillator structure 4 arranged in the pyramid sandwich, and a rotating support 5 fixed to a lower portion of an outer portion of the pyramid sandwich. On the basis of an original periodic sandwich structure, the local resonance microstructure formed by the X-type local oscillator structures 4 is added, the metamaterial beam is designed by applying a local resonance idea in periodic design, and the metamaterial beam is suitable for structural ultra-low-frequency-band and high-frequency-band vibration reduction requirements and structural band gap research. According to the metamaterial lattice sandwich structure, wave attenuation in the ultralow frequency range and the high frequency range can be achieved at the same time, the metamaterial lattice sandwich structure can be widely applied to engineering and life, the quite obvious vibration reduction effect is achieved, and requirements for vibration reduction and performance optimization under multiple frequency bands can be met.
Description
technical field [0001] The present application relates to structural vibration, in particular to a vibration-damping metamaterial lattice sandwich beam with adjustable band gap frequency. Background technique [0002] Although lightweight sandwich structures have been widely used in practical engineering, how to control the wave propagation and vibration in these structures in the low frequency range is still a challenge. Researchers have studied the dynamic behavior of lightweight sandwich structures, but designing lattice sandwich beams with metamaterial properties to suppress vibrations in the low frequency range has never been found in the existing literature. [0003] In addition, existing lightweight sandwich beam structures generally only match a single or narrow range of resonance bandgap. The natural frequency adjustment range of the existing beam structure elements is limited, and it is difficult to design the band gap frequency range to the low frequency range, s...
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Login to View More IPC IPC(8): E04C3/02E04C3/08E04B1/344E04B1/98E04H9/02
CPCE04C3/02E04C3/08E04B1/3441E04B1/98E04H9/021E04H9/0215E04H9/023
Inventor 郭振坤张晨陈新华蒋国庆
Owner BEIJING UNIV OF CIVIL ENG & ARCHITECTURE