Small low frequency wave absorbing device
A low-frequency noise and component technology, which is applied in the field of low-frequency and seismic wave absorption waves, and can solve problems such as bulkiness and attenuation.
Active Publication Date: 2022-01-11
THE HONG KONG UNIV OF SCI & TECH
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[0010] In practical applications, the attenuation of extremely low frequency wave energy is usually a blank field that no one has touched, and the existing technologies either require large or bulky structures or materials, or can only be aimed at attenuation or absorption of higher frequencies
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[0016] Overview
[0017] When an acoustic or electromagnetic wave is incident on the surface of a structure or material, a response is produced in the form of reflected waves plus waves penetrating the structure or material. This wave response must be causal, i.e., the wave response at any given moment can only depend on what happened before that moment, which is called the principle of causality. In other words, waves incident in the future will not affect the present response. When expressed in the language of mathematics, this intuitive and seemingly trivial statement can have profound implications that touch almost all areas of physics. An example of the principle of causality is the relationship between the real and imaginary parts of the dielectric function of electromagnetism, deduced by Hans Kramers and Ralph Kronig in the 1820s The relationship is known as the Kramers-Kronig relationship. A little-known implication of the causal principle is the inequality linkin...
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Provides a method of providing attenuation damping for low frequency noise and vibration. The rotational translation of the inertial mass rotor is used to provide damping of low frequency noise and vibration. The method includes providing an axial assembly having a linearly translatable member; and coupling an inertial mass rotor to the inertial linearly translatable member to induce rotational motion from axial movement of the inertial linearly translatable member to the inertial mass rotor transformation, which in turn provides an inertial amplification effect in the form of a translation-rotation coupling. The axial assembly is mounted such that the axial motion of the inertial linearly translatable member is converted into rotational motion of the inertial mass rotor. This enables the construction of compact assemblies that allow multiple ultra-low frequency resonances to be concentrated and absorb noise energy at such low frequencies. A low frequency noise and vibration attenuation damping device and device for providing low frequency noise and vibration attenuation damping are also provided.
Description
[0001] related application [0002] This patent application claims priority to U.S. Provisional Patent Application No. 62 / 764,958, filed August 22, 2018, assigned to the assignee of the present invention and filed by the inventor, and which is incorporated by reference Incorporated into this article. technical field [0003] The present disclosure relates to low frequency and seismic wave absorbers for absorbing energy and remediating low frequency noise and vibration. Background technique [0004] The term "low-frequency mechanical wave" used in this disclosure refers to seismic waves, low-frequency vibrations, and noises in the frequency range of 0.1 to 300 Hz. Such low-frequency mechanical waves are very difficult to block or absorb due to their very long wavelengths, unless very large-scale materials and structures are used. Metamaterials can play a role in achieving subwavelength sample sizes by exploiting resonances. But for such a low-frequency range, even subwavel...
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IPC IPC(8): F16F7/10F16F7/104G05B13/04
CPCF16F7/1022F16F7/116E04H9/0215F16F2222/08F16F2230/0094F16F2232/06H02K7/025F16F15/02
Inventor 沈平董镇
Owner THE HONG KONG UNIV OF SCI & TECH