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CN-224231721-U - Resonance acoustic sound absorption performance detection sample piece with spiral groove

CN224231721UCN 224231721 UCN224231721 UCN 224231721UCN-224231721-U

Abstract

The utility model relates to the technical field of acoustic detection, in particular to an acoustic sound absorption performance detection sample with a spiral groove, which comprises a sealed shell with a resonant cavity, wherein a convex block is formed on one surface of the shell in an inward protruding mode, the surface of the shell provided with the convex block is provided with the spiral groove along the direction of the convex block, and the spiral groove is communicated with the resonant cavity. The spiral groove is positioned at the lug of the detection sample, namely the neck of the resonator, the equivalent length is lengthened, the volume is compressed, and the spiral groove can realize a longer sound channel path in a small physical space, which is equivalent to increasing the equivalent neck length without a long linear structure. In addition, such a structural arrangement can realize low-frequency resonance while maintaining a small size, and the resonance frequency at a given volume can be made lower with the bump having the spiral groove as the neck in the test sample.

Inventors

  • ZHONG HAIBIN
  • ZHOU XIONGFENG
  • CHEN WEIQUAN
  • LIANG QIN

Assignees

  • 广东省东莞市质量监督检测中心

Dates

Publication Date
20260512
Application Date
20250430

Claims (10)

  1. 1. The utility model provides a resonance acoustic sound absorption performance detects sample piece with helicla flute, its characterized in that, detect sample piece is including sealed housing (2) that have resonance cavity (1), a surface inwards protrusion of housing (2) is formed with lug (3), is equipped with lug (3) on housing (2) surface follow direction of lug (3) has seted up helicla flute (4), helicla flute (4) intercommunication resonance cavity (1).
  2. 2. The resonant acoustic performance test sample with helical groove according to claim 1, characterized in that the profile of the helical groove (4) is an archimedes line.
  3. 3. The resonance-acoustic sound-absorbing performance test specimen with helical groove according to claim 2, characterized in that the helical groove centerline Rg of the helical groove (4) is represented in the XOY plane as: Where g represents the width of the spiral groove, b represents the width of the spiral, α represents the angle of the spiral, and the rate of increase of the spiral is expressed as: Assuming that the initial angle of the spiral is 0, the post-rotation termination angle is 2pi×n1 around n1, and the parameter equation of the spiral groove center line under Cartesian coordinates is expressed as follows: Obtaining a spiral groove center line through a parameter equation (3), and obtaining the contour of the spiral groove with g width by shifting a center curve by +/-g/2 distance along the radial direction, wherein the shifted contour curve of the spiral groove (4) is expressed as follows under Cartesian coordinates:
  4. 4. The resonant acoustic performance test sample with helical groove according to claim 1, characterized in that the resonant cavity (1) is a helmholtz resonant cavity.
  5. 5. The resonance-acoustic sound-absorbing performance test specimen with helical grooves according to claim 1, characterized in that the shape of the bump (3) is a cylindrical structure.
  6. 6. The resonance acoustic sound absorption performance test sample with spiral groove according to claim 1, characterized in that the shape of the housing (2) is rectangular, and the bump (3) is arranged in the resonance cavity (1) along the length direction of the rectangle.
  7. 7. The resonant acoustic performance test sample with spiral grooves according to claim 1, characterized in that the parameters of the spiral groove (4) comprise the width gap of the spiral groove, the width w1 of the spiral beam, the initial radius a1 of the spiral, the number of turns n1 of the spiral, the lattice constant a, the initial rotation angle theta_0 of the spiral, the height ha and the structure thickness t.
  8. 8. The resonant acoustic performance test sample with helical groove of claim 7, wherein a plurality of said test samples are provided, a plurality of said test samples being arranged in an array.
  9. 9. The resonant acoustic performance test sample with helical groove according to claim 8, characterized in that at least one of the parameters of the helical groove (4) in each test sample is different.
  10. 10. The resonance-acoustic sound-absorbing performance test sample with helical groove according to claim 8, characterized in that the length of the resonance cavity (1) in the direction of the bump (3) in each test sample is the same or not the same.

Description

Resonance acoustic sound absorption performance detection sample piece with spiral groove Technical Field The utility model relates to the technical field of acoustic detection, in particular to an acoustic sound absorption performance detection sample with a spiral groove. Background The acoustic sound absorbing material is used as a key technical means for controlling noise pollution, improving indoor tone quality and improving acoustic environment comfort, and plays a vital role in building acoustics, aerospace, automobile manufacturing, household appliances, recording studio and various noise control projects. With the increasing demands of society for sound environment quality, an acoustic sound absorbing material which is efficient, environment-friendly, light and has specific frequency absorption characteristics is becoming a hotspot for research and development. Currently, commonly used sound absorbing materials include porous materials (e.g., glass wool, rock wool), fibrous materials (e.g., polyester fiber, polyurethane foam), composite materials (e.g., polymer matrix composite materials), and acoustic metamaterials (e.g., localized resonance type, helmholtz type). These materials achieve absorption and reduction of sound waves through different sound absorption mechanisms, such as air vibration, sound wave scattering, energy conversion, and the like. Among them, the localized resonance acoustic sound absorbing material receives a great deal of attention because of its unique sound absorbing mechanism and efficient sound absorbing performance. To accurately evaluate the sound absorption performance of an acoustic sound absorbing material, a specialized sound absorption performance detection device is required. At present, the commonly used sound absorption performance detection device mainly comprises a standing wave tube method, a reverberation room method, an impedance tube method and the like. These devices evaluate the sound absorption properties of materials by measuring their sound absorption coefficients or amounts at different frequencies. Prior to testing the sound absorption properties of materials using these devices, standard materials with known sound absorption properties (e.g., foams or fiberboard with known sound absorption coefficients) are typically selected for initial testing, the sound absorption coefficients are measured and compared to standard values, and the equipment or measurement settings are adjusted to calibrate the instrument. However, conventional calibration materials have some drawbacks when applied to these detection devices. Under the condition of fixed volume, the traditional calibration material is difficult to effectively reach lower resonance frequency, and a resonance acoustic sound absorption performance detection sample piece with a spiral groove is provided. Disclosure of utility model The utility model aims to overcome the defect that the lower resonance frequency is difficult to effectively reach under the condition of fixed volume of the traditional calibration material in the prior art, and provides a resonance acoustic sound absorption performance detection sample with a spiral groove. In order to solve the technical problems, the utility model adopts the following technical scheme: The utility model provides a resonance acoustic sound absorption performance detects sample piece with helicla flute, detect sample piece includes the sealed housing that has resonance cavity, a surface of casing inwards protrusion is formed with the lug, is equipped with the lug on the casing surface follow the direction of lug has seted up the helicla flute groove, the helicla flute intercommunication resonance cavity. In the technical scheme of the application, the lug is positioned in the resonant cavity, and the spiral groove is formed in the surface of the shell of the lug along the direction of the lug and is communicated with the resonant cavity. By adopting the arrangement mode, the space utilization rate can be effectively improved, and the utilization rate of the whole detection sample piece material is reduced, so that the cost is reduced. The proof mass may be equivalently a spring-mass system with the bumps acting as masses and the resonant cavity acting as a spring. The spiral groove is positioned on the convex block of the detection sample, namely the neck of the resonator, the equivalent length is lengthened, the volume is compressed, and the spiral groove can realize a longer sound channel path in a small physical space, which is equivalent to increasing the equivalent neck length without a long linear structure. In addition, such a structural arrangement can realize low-frequency resonance while maintaining a small size, and the resonance frequency at a given volume can be made lower by using a bump having a spiral groove as a neck in the test sample. Further, the outline of the spiral groove is an archimedes line. Further, the helical groove center lin