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PMMA (polymethyl methacrylate) thin plate bending vibration-based elastic SV-wave filter and filtering method

A bending vibration and filter technology, which is applied in the field of elastic SV wave filters, can solve the problems of narrow band gap and lack of narrow pass band of phononic crystals, and achieve the effects of adjustable working frequency, low manufacturing cost and simple configuration

Active Publication Date: 2017-10-03
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the existing phononic crystals are only suitable as wide-passband filters, because the forbidden bandwidth of phononic crystals is relatively narrow, and there is still a lack of narrow-passband filters, especially based on beams, plates and shells. Narrow pass-band filters for mechanical basic units

Method used

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  • PMMA (polymethyl methacrylate) thin plate bending vibration-based elastic SV-wave filter and filtering method
  • PMMA (polymethyl methacrylate) thin plate bending vibration-based elastic SV-wave filter and filtering method
  • PMMA (polymethyl methacrylate) thin plate bending vibration-based elastic SV-wave filter and filtering method

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Experimental program
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Embodiment 1

[0034] Embodiment 1: as figure 1 As shown, an elastic SV wave filter based on the bending vibration of a PMMA sheet includes at least two substrates 1 spaced apart and a plexiglass sheet 2 connected between two adjacent substrates 1, the plexiglass Thin plate 2 is equidistantly provided with a plurality of along its thickness direction, and each described plexiglass thin plate 2 is perpendicular to the connection surface of described substrate 1; The thickness of described plexiglass thin plate 2 is h, and length is its corresponding phase The distance L between two adjacent substrates 1 , wherein L / h is greater than or equal to 5. The base 1 is made of steel, aluminum or copper.

[0035] During operation, first give the initial thickness h and the initial length L of described plexiglass sheet 2; Then according to the governing equation of bending wave in plexiglass sheet:

[0036]

[0037] Where ω is the angular frequency, w is the bending disturbance of the plexiglass ...

Embodiment 2

[0046] Embodiment 2, the difference with embodiment 1 mainly lies in adopting the finite element numerical model to obtain the theoretical transmission spectrum of the elastic SV wave filter based on the bending vibration of the PMMA thin plate, specifically as Figure 5 As shown, a finite element numerical model is established based on the size of the plexiglass plate initially set in step B; the numerical model includes a plexiglass plate area corresponding to the plexiglass plate 2, its length is L, and its width is h , two base material areas corresponding to the base body 1 have a length of L and a thickness of h', and the base material areas are respectively connected to the two ends of the length direction of the plexiglass plate area; The upper and lower boundaries of are periodic boundary conditions, and horizontal displacement restrictions are imposed on both ends of the entire model length direction to eliminate rigid body displacement; the two regions of the base ma...

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Abstract

The present invention discloses a PMMA (polymethyl methacrylate) thin plate bending vibration-based elastic SV-wave filter and a filtering method. The PMMA thin plate bending vibration-based elastic SV-wave filter comprises at least two base bodies which are arranged at intervals and polymethyl methacrylate thin plates which are connected between two adjacent base bodies; a plurality of polymethyl methacrylate thin plates are arranged equidistantly along the thickness direction of the polymethyl methacrylate thin plates; each of the polymethyl methacrylate thin plates is perpendicular to the connection surfaces of the base bodies; and the thickness of each of the polymethyl methacrylate thin plates is h; the length of the polymethyl methacrylate thin plates is a distance L between the corresponding two adjacent base bodies; and L / h is greater than or equal to 5. The PMMA (polymethyl methacrylate) thin plate bending vibration-based elastic SV-wave filter of the invention has the advantages of simple configuration, low manufacturing cost and adjustable operation frequency. The filtering method of the invention can be applied to narrow-pass band elastic SV-waves.

Description

technical field [0001] The invention relates to the technical field of elastic SV wave filters, in particular to an elastic SV wave filter and a filtering method based on bending vibration of a PMMA thin plate. Background technique [0002] Due to the existence of forbidden bands, phononic crystals are attracting the attention of researchers from various countries to be used as isolators and filters for acoustic and elastic waves (for example, they can be used as vibration isolators for high-precision instruments, etc.). The forbidden band of the phononic crystal is closely related to the material parameters of the phononic crystal, the geometry of the inclusions, and the distribution of the inclusions. Usually, the bandgap of phononic crystals is relatively narrow and the frequencies in the bandgap are in the range of relatively high frequencies. These characteristics of the bandgap obviously limit the application fields of phononic crystals. [0003] So far, in addition t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06F17/50B32B17/06
CPCB32B17/061G06F30/23G06F2218/02Y02E40/10
Inventor 章俊刘瑶璐胡宁
Owner CHONGQING UNIV
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