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CN-122024682-A - Dual-resonance underwater sound absorption super structure

CN122024682ACN 122024682 ACN122024682 ACN 122024682ACN-122024682-A

Abstract

The invention relates to the technical field of underwater sound absorption, in particular to a double-resonance underwater sound absorption super structure. The structure includes the rigid support backplate, and the holding tank has been seted up to the rigid support backplate, is provided with the flexible base member of sound absorption in the holding tank, and the flexible base member of sound absorption is embedded to be provided with the balancing weight, and the holding tank bottom is provided with annular supporting bench, is provided with the vibrating plate on the annular supporting bench, and holding tank bottom, annular supporting bench and vibrating plate enclose into local resonance cavity, and the vibrating plate downside that is in local resonance cavity is attached with the piezoelectricity material layer, and the piezoelectricity material layer is connected with adjustable shunt circuit. By adopting the underwater sound absorption super structure with double resonance, the size is reduced while the sound absorption effect is ensured, the low-frequency high-efficiency sound absorption under the deep sub-wavelength scale is realized, the sound absorption of the multi-variable frequency band underwater noise is realized through the adjustable shunt circuit, and two resonance peaks are introduced in the frequency band with lower sound absorption coefficient, so that the integral sound absorption coefficient is improved.

Inventors

  • ZHOU WEIJIAN
  • Que Jiayi
  • LIN ZHENYU

Assignees

  • 哈尔滨工业大学(深圳)(哈尔滨工业大学深圳科技创新研究院)

Dates

Publication Date
20260512
Application Date
20260403

Claims (9)

  1. 1. The double-resonance underwater sound absorption super structure is characterized by comprising a rigid support backboard, wherein a rigid protection support ring extends out of the rigid support backboard, an accommodating groove is formed by the rigid protection support ring and the rigid support backboard, a sound absorption flexible substrate is arranged in the accommodating groove, a balancing weight is embedded in the sound absorption flexible substrate, an annular support table is arranged on the rigid support backboard on the inner side of the rigid protection support ring, a vibrating plate is arranged on the annular support table, a local resonance cavity is formed by the bottom of the accommodating groove, the annular support table and the vibrating plate in a surrounding mode, a piezoelectric material layer is attached to the lower side of the vibrating plate in the local resonance cavity, and an adjustable shunt circuit is connected to the piezoelectric material layer.
  2. 2. The double-resonance underwater sound absorption super structure according to claim 1, wherein the inner radius of the annular supporting table is 22-27 mm, the outer radius is 25-35mm, the height is 5.5mm, and the annular supporting table is made of steel.
  3. 3. The double-resonance underwater sound absorption super structure according to claim 2, wherein the vibrating plate is annular, has a radius of 25mm-35mm and a thickness of 03mm-0.6mm, and is made of steel.
  4. 4. The underwater sound absorption super structure with double resonance according to claim 3, wherein the thickness of the rigid support back plate is 10-30mm, the radius of the rigid support back plate is 40mm, the depth of the accommodating groove is 30mm, the radius of the accommodating groove is 37mm, and the rigid support back plate is made of steel.
  5. 5. The underwater sound absorption super structure with double resonance as claimed in claim 4, wherein the sound absorption flexible matrix is polyurethane elastomer.
  6. 6. The double-resonance underwater sound absorption super structure according to claim 5, wherein the balancing weight is made of lead, the balancing weight is in a cylinder shape, the radius of the cylinder is 1.5mm-3mm, the height is 12mm-18mm, the central axis of the balancing weight coincides with the central axis of the sound absorption flexible matrix, and the bottom of the balancing weight is 2.8mm-3mm away from the upper side of the vibrating plate; The sound wave causes the sound absorption flexible matrix and the balancing weight to vibrate, the sound absorption flexible matrix and the balancing weight vibrate to form a mass-spring system with a local resonance cavity at the bottom, local resonance occurs at the frequency corresponding to the first resonance peak, and the sound energy is converted into mechanical energy and then into heat energy for dissipation.
  7. 7. The underwater sound absorption super structure with double resonance as claimed in claim 6, wherein the piezoelectric material layer is made of piezoelectric ceramics, the radius is 14mm-15mm, the thickness is 0.5mm-1mm, and the circle center of the piezoelectric material layer and the circle of the vibration plate are positioned on the same axis.
  8. 8. The underwater sound absorption super structure with double resonance as set forth in claim 7, wherein the upper and lower sides of the piezoelectric material layer are provided with electrodes, the electrodes are connected with an adjustable shunt circuit through wires, the adjustable shunt circuit is an adjustable LC oscillating circuit, the adjustable LC oscillating circuit comprises a plug capacitor and a plug inductor which are arranged in series, the adjustment of the capacitance value and the inductance value is realized by changing the plug capacitor and the plug inductor, and the continuous translational adjustment of the second formant position is realized.
  9. 9. The underwater sound absorption super structure with double resonance as claimed in claim 8, wherein the local resonance cavity is filled with air.

Description

Dual-resonance underwater sound absorption super structure Technical Field The invention relates to the technical field of underwater sound absorption, in particular to a double-resonance underwater sound absorption super structure. Background With the depth expansion of human marine activity, underwater acoustic stealth capability is directly related to the viability of underwater equipment. The traditional sound absorption material still generally has the problems of weak low-frequency sound absorption performance, narrow effective bandwidth, overlarge thickness of a structure required by a low frequency band and the like, and is difficult to meet the urgent requirements of modern underwater equipment on light, thin and wide-band sound absorption technology. Under the background, the underwater sound absorption metamaterial, which can break through the limitation of the traditional materials, realizes low-frequency, broadband and high-efficiency sound absorption, has the ultra-thin characteristic under the sub-wavelength scale, rapidly becomes a front research hot spot in the field, and is particularly critical and urgent to development and application. The existing underwater sound absorption metamaterial is single in structure and difficult to realize double resonance in a low-frequency range. Disclosure of Invention The invention aims to provide a double-resonance underwater sound absorption super structure, which solves the technical problems. In order to achieve the above purpose, the invention provides a double-resonance underwater sound absorption super structure, which comprises a rigid support back plate, wherein a rigid protection support ring extends out of the rigid support back plate, the rigid protection support ring and the rigid support back plate form an accommodating groove, a sound absorption flexible matrix is arranged in the accommodating groove, a balancing weight is embedded in the sound absorption flexible matrix, an annular support table is arranged on the rigid support back plate on the inner side of the rigid protection support ring, a vibrating plate is arranged on the annular support table, a local resonance cavity is formed by the bottom of the accommodating groove, the annular support table and the vibrating plate, a piezoelectric material layer is attached to the lower side of the vibrating plate in the local resonance cavity, and the piezoelectric material layer is connected with an adjustable shunt circuit. Preferably, the inner radius of the annular supporting table is 22-27 mm, the outer radius is 25-35mm, and the height is 5.5mm, and the annular supporting table is made of steel. Preferably, the vibrating plate is annular, has a radius of 25mm-35mm and a thickness of 03mm-0.6mm, and is made of steel. Preferably, the thickness of the rigid support backboard is 10-30mm, the radius of the rigid support backboard is 40mm, the depth of the accommodating groove is 30mm, the radius of the accommodating groove is 37mm, and the rigid support backboard is made of steel. Preferably, the sound absorbing flexible matrix is a polyurethane elastomer. Preferably, the balancing weight is made of lead, the balancing weight is in a cylinder shape, the radius of the cylinder is 1.5mm-3mm, the height of the cylinder is 12mm-18mm, the central axis of the balancing weight is coincident with the central axis of the sound absorption flexible substrate, and the bottom of the balancing weight is 2.8mm-3mm away from the upper side of the vibrating plate; The sound wave causes the sound absorption flexible matrix and the balancing weight to vibrate, the sound absorption flexible matrix and the balancing weight vibrate to form a mass-spring system with a local resonance cavity at the bottom, local resonance occurs at the frequency corresponding to the first resonance peak, and the sound energy is converted into mechanical energy and then into heat energy for dissipation. Preferably, the piezoelectric material layer is made of piezoelectric ceramics, the radius is 14mm-15mm, the thickness is 0.5mm-1mm, and the circle center of the piezoelectric material layer and the circle of the vibration plate are positioned on the same axis. Preferably, electrodes are arranged on the upper side and the lower side of the piezoelectric material layer, the electrodes are connected with an adjustable shunt circuit through wires, the adjustable shunt circuit is an adjustable LC oscillating circuit, the adjustable LC oscillating circuit comprises a plug capacitor and a plug inductor which are arranged in series, and the adjustment of a capacitance value and an inductance value is realized by replacing the plug capacitor and the plug inductor, so that the continuous translational adjustment of the position of the second formant is realized. Preferably, the local resonance cavity is filled with air. Therefore, the invention adopts the double-resonance underwater sound absorption super structure, and has the beneficial e