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A series-structured phononic crystal

A phononic crystal, series structure technology, applied in the direction of sound-producing equipment, instruments, etc., can solve the problems of poor strength, short service life, unable to meet the vibration isolation performance at the same time, to solve the problem of too narrow frequency band, widened frequency band width, low frequency attenuation The effect of increasing

Active Publication Date: 2020-12-15
HARBIN INST OF TECH AT WEIHAI
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Problems solved by technology

[0008] The above studies show that local resonant phononic crystals have a good effect on low-frequency vibration isolation, but they cannot satisfy the vibration isolation performance at low frequencies and wide frequency ranges at the same time.
Existing phononic crystal matrix materials mostly use epoxy resin or plexiglass, etc. Although these materials have low density and relatively good elasticity, they are difficult to apply to practical structures due to their poor strength and short service life. This has also become the main reason for limiting the application of phononic crystals in low-frequency vibration isolation in practical structures.

Method used

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Embodiment Construction

[0027] A series-structured phononic crystal is provided with a base plate, which is characterized in that at least two types of vibration units with different band gap characteristics are vertically connected in series on the base plate. At least one row of vibrating units is provided in the transverse direction of the base plate, and the number of columns of vibrating units in the transverse direction of the base plate can be adjusted arbitrarily according to the actual vibration range. Each column of vibration units is formed by periodically arranging at least two types of vibration units with different bandgap characteristics on the base plate (longitudinal direction); in each period, there is at least one type of vibration unit. The vibration unit described in is composed of a vibration base and a vibrator; the vibrator is fixedly connected to the vibration base. The vibration base is processed on the base plate by material removal method, and is used for installing the vi...

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Abstract

A phononic crystal with a series structure relates to the technical field of phononic crystal structures. It is provided with a base plate, and at least two vibration units with different band gap characteristics are vertically connected in series on the base plate. The invention has the advantages of good vibration isolation characteristics in low frequency and wide frequency range, simple structure, high strength, suitable for practical application and the like.

Description

technical field [0001] The invention relates to the technical field of a phononic crystal structure, and describes in detail a phononic crystal with a serial structure that has good vibration isolation characteristics in low frequency and wide frequency ranges, simple structure, high strength, and is suitable for practical applications. Background technique [0002] We know that low-frequency vibration has a great impact on production and life, and a reasonable and effective solution to the problem of low-frequency broadband vibration isolation has become a research hotspot in recent years. [0003] In the "2000-2035 Naval Technology" report, the U.S. Navy pointed out that among the six key technologies that submarines must focus on developing in the 21st century, acoustic stealth technology is listed as the first of the six key technologies for key development. [0004] With the continuous expansion of sonar technology to the low-frequency band, the low-frequency end of act...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10K11/16G10K11/162
CPCG10K11/16G10K11/162
Inventor 马琮淦杨仕祥李庆孙湘东陈超逸武昊
Owner HARBIN INST OF TECH AT WEIHAI
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