WO2015109761A1 - Panneau d'isolation et d'absorption phonique léger et fin à moyenne et basse fréquence, et panneau mural composite de celui-ci - Google Patents

Panneau d'isolation et d'absorption phonique léger et fin à moyenne et basse fréquence, et panneau mural composite de celui-ci Download PDF

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Publication number
WO2015109761A1
WO2015109761A1 PCT/CN2014/081328 CN2014081328W WO2015109761A1 WO 2015109761 A1 WO2015109761 A1 WO 2015109761A1 CN 2014081328 W CN2014081328 W CN 2014081328W WO 2015109761 A1 WO2015109761 A1 WO 2015109761A1
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Prior art keywords
sound
absorbing
sound insulation
insulation
medium
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PCT/CN2014/081328
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English (en)
Chinese (zh)
Inventor
黄震宇
罗旭东
马红孺
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上海交通大学
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Priority claimed from CN201410037510.6A external-priority patent/CN103738037B/zh
Priority claimed from CN201410275779.8A external-priority patent/CN104078036A/zh
Application filed by 上海交通大学 filed Critical 上海交通大学
Publication of WO2015109761A1 publication Critical patent/WO2015109761A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/10—Properties of the layers or laminate having particular acoustical properties
    • B32B2307/102—Insulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/304—Insulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/51—Elastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/72—Density
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00—Vehicles

Definitions

  • the invention relates to a sound absorbing and sound absorbing panel, in particular to a medium and low frequency light and thin sound absorbing sound absorbing panel and a composite siding thereof.
  • the structure of the cabin wall from the outside to the inside includes: a thin aluminum plate of about 1.5 mm, called "skin", designed according to the strength and shape; 5 ⁇ : L0 cm compartment, placed adiabatic sound absorption Cotton and laying pipelines; the closest to the cabin is a lightweight decorative panel, the design principle is aesthetic.
  • the vibration, noise and gas turbulent pulsating noise generated by the engine outside the engine are concentrated in a continuous wide band of 100 - 5000 Hz. Due to the light weight of the cabin siding, the medium and low frequency sound insulation of 100 - 1000 Hz is the weakest, so that the cabin noise energy is concentrated in the weak sound insulation band.
  • Increasing the sound insulation of the middle and low frequency wall panels is to reduce the noise level in the aircraft cabin. The key path.
  • the conventional methods include: (1) increasing the weight of the skin and the decorative panel. Since the areal density determines the sound insulation level in the 100 - 1000 Hz band, according to the "quality theorem" of the sound insulation, the areal density of the wall is doubled and the wall insulation can be increased by 6 dB. For commercial aircraft, the cost of significantly increasing the weight of the siding is unacceptable. (2) Adding sound absorbing material to the wall partition. When the thickness of the sound absorbing material is equal to the wavelength of the sound wave, the sound absorption rate is higher, the sound wave wavelength below 1000 Hz is greater than 30 cm, and the thickness of the commercial aircraft is generally less than 10 cm, and there is a pipeline through which the sound absorption can be filled.
  • the thickness of the cotton does not effectively absorb low and medium frequency noise below 1000 Hz.
  • LRPM Locally Resonant Phononic Material
  • Chinese Patent No. CN1664920A Chinese Patent No. CN1664920A
  • the material is periodically arranged by artificially constructed lattice elements, which have a lower resonant frequency.
  • a lower anti-resonant frequency can be obtained between the first and second resonant frequencies, at which time the average displacement of the entire unit is zero, thus in the free space far field.
  • the sound pressure "positive and negative phase cancellation" effect occurs, and the sound insulation amount of 5 dB or more higher than the homogeneous material of the same areal density is obtained.
  • this LRPM only has a good sound insulation effect in a narrow frequency band near its anti-resonance frequency, and a frequency band with poor sound insulation in the adjacent frequency domain (near the first and second resonance frequencies) "Peak Valley”). In the “peak valley” band, its sound insulation effect is worse than ordinary materials.
  • LRPM plates are superimposed, the sound insulation "peaks” of other LRPM plates can compensate for the performance of the "peaks and valleys” of a certain LRPM plate, but there are still “peaks and valleys” and the thickness of the material is increased. More importantly, in the application of the above-mentioned compartment wall, LRPM can only be placed in the compartment because the material outside the cabin is a uniform material with strength requirements.
  • Chinese patent CN101693415A discloses a sound absorbing and insulating material which is composed of a multi-layer sound absorbing cotton felt and an elastic sponge body by a damping composite rubber. This composite plate using damping and sound absorption is more effective for isolating high frequency sound waves, but it is not good for the isolation of medium and low frequency noise with long sound waves.
  • Chinese patent CN203186250U discloses a layered composite sound-insulating acoustic wall panel using an aluminum plate, a rubber skeleton, a multi-layer sound absorbing cotton and a damping layer. Such panels are still relatively thick and heavy, and are difficult to adapt to the weight and space requirements of modern high-speed vehicles, particularly aerospace vehicles. Summary of the invention
  • the existing LRPM sound insulating band is narrow and there is a problem of sound insulation "peak and valley", and the present invention provides a medium and low frequency light.
  • the thin layer of sound-absorbing and sound-absorbing material can effectively isolate and absorb the low-frequency sound energy above 100 Hz, and obtain better sound insulation effect in a wider frequency band.
  • a medium-low frequency lightweight thin-layer sound-absorbing sound-absorbing board characterized in that: a plurality of sound-absorbing and sound-absorbing units arranged side by side, each of the sound-absorbing and sound-absorbing units comprises a rigid frame, an elastic film and a through hole
  • the perforated plate is composed of the elastic film connected to the rigid frame, and the perforated plate is connected to the elastic film.
  • a connector is further included, and the perforated plate is connected to the elastic film via the connecting member.
  • the perforated plate is a rigid plate of aluminum, plastic or ceramic.
  • the ratio of the sum of the pore areas of the perforated plate to the area of the perforated plate is less than 20%.
  • the through hole of the perforated plate has a hole diameter of 0.5 mm to 2.0 mm.
  • the connecting member is cylindrical, circular or square cylindrical.
  • the elastic film is provided with a plurality of through holes, and the ratio of the sum of the pore areas of the through holes to the surface area of the elastic film is less than 5%.
  • the through hole of the elastic film has a diameter of 0.05 mm to 0.2 mm.
  • a medium-low frequency sound-absorbing and sound-absorbing composite panel is characterized in that it comprises two sound-absorbing sound-absorbing panels and a sound absorbing material interposed between rigid frames of the sound-absorbing sound-absorbing panels.
  • the sound absorbing material is a flexible sound absorbing cotton, and the flexible sound absorbing cotton is interlaced and staggered between the two sound absorbing sound absorbing panels, and the sound absorbing material has a thickness of less than 1 cm.
  • a medium-low frequency sound insulation and heat insulation composite wall panel is characterized in that the composition comprises a casing connected in order from the outside to the inside, an insulating sound absorbing layer and the medium and low frequency sound absorbing and sound absorbing composite panel.
  • the inner side of the composite panel is further provided with at least one additive group, which is a second sound absorbing material and a second sound absorbing sound absorbing panel from the outside to the inside.
  • the insulating sound absorbing layer has a thickness of about 2 to 5 cm.
  • the medium-low frequency lightweight thin-layer sound-absorbing sound absorbing panel blocks and consumes sound waves through local resonance and pore energy consumption.
  • the medium-low frequency sound-absorbing and sound-absorbing composite board mainly uses the mechanism of "near-field wave” energy dissipation to perform sound absorption and sound absorption: when the sound wave is incident on the first coupled vibration plate, in addition to generating the transmitted wave and the reflected wave, The surface of the plate excites attenuating waves (ie, "near-field waves”). In the normal direction of the plate, the attenuation wave sound pressure decays exponentially with the change of the distance; in this direction, the average energy density of the attenuation wave is zero, that is, the acoustic energy is not transmitted outward. So in a conventional sound insulation structure, Near-field wave energy is not considered as a sound absorption.
  • a light sound absorbing material such as a thin layer of sound absorbing cotton
  • these soft materials have substantially no influence on the physical properties such as the resonant frequency of the coupled vibrating plate. More importantly, they absorb the energy of the attenuated wave in addition to the small amount of incident, transmitted and reflected waves absorbed by the lower sound absorption efficiency. Near the coupled vibration frequency of the composite board, the attenuation wave will be reflected back and forth multiple times to achieve high acoustic energy, thereby increasing the energy absorbed by the sound absorbing material. The fading wave energy continuously absorbed by the sound absorbing cotton needs to be provided by the incident sound wave, thereby reducing the energy of the transmitted wave and improving the sound insulation performance as a whole. Two coupled vibrating plates need to be close enough
  • the medium-low frequency sound insulation and heat insulation composite wall panel mainly utilizes the coupling effect of the low-frequency sound-absorbing and sound-absorbing composite plate and the outer casing to improve the sound insulation effect, so the distance between the outer casing and the composite plate is more important.
  • the sound insulation of the mid-low frequency sound-absorbing and sound-absorbing composite panel is increased by nearly 9 dB in the design frequency band.
  • the sound insulation of the wide band can be obtained by adjusting the shape of the connector.
  • the low-frequency sound insulation and heat insulation composite wall panel of the invention has good sound insulation effect in the middle and low frequency domains, and can also be near a given frequency. (ie, near the peak frequency of the sound insulation) Increase the sound insulation by about 25 dB.
  • the peak frequency of the sound insulation can be designed as needed.
  • the low-frequency sound insulation and heat insulation composite wall board effectively solves the double-layer sound insulation board in the low frequency domain.
  • the coupling vibration cannot effectively solve the problem of sound insulation.
  • the sound insulation performance in most frequency domains of the middle and low frequency bands is stronger than that of the double sound insulation board.
  • the sound insulation performance of 17 dB can be improved at the peak of the sound insulation, and the peak frequency of the sound insulation can be designed as needed.
  • the low-frequency sound insulation and heat insulation composite wall panel of the invention effectively improves the performance of the peak and valley of the sound spectrum curve of the sound insulation, and the sound insulation amount is increased by at least 4 dB. This is crucial for mid-low frequency sound insulation.
  • the low-frequency sound insulation and heat insulation composite wall panel mainly utilizes the near-field wave energy consumption and the coupling between the multi-layer boards to rapidly attenuate the sound waves. Therefore, if the distance between the coupling diaphragms is too large or the distance between the housing and the coupling diaphragm is too large, the above effect is not obtained. On the other hand, the small distance between the plates is also a requirement for material thinning.
  • FIG. 1 is a schematic cross-sectional view of a low-frequency lightweight thin-layer sound-absorbing sound absorbing panel unit according to the present invention.
  • Fig. 2 is a cross-sectional view showing a second embodiment of a low frequency lightweight thin layer sound insulating and absorbing panel unit according to the present invention.
  • FIG. 3 is a cross-sectional view showing the structure of a low-frequency sound-absorbing and sound-absorbing composite panel of the present invention.
  • FIG. 4 is a cross-sectional view showing another embodiment of the structure of the low-frequency sound-absorbing and sound-absorbing composite panel of the present invention.
  • Figure 5 is a cross-sectional view of the low frequency sound insulation and heat insulation composite wall panel of the present invention, wherein the arrow represents the incident direction of the sound wave.
  • Figure 6 shows a composite siding of an aircraft cabin.
  • Figure 7 shows a thicker composite siding.
  • FIG. 1 is a schematic cross-sectional view of a low-frequency lightweight thin-layer sound-absorbing and sound-absorbing panel unit according to the present invention.
  • a medium-low frequency lightweight thin-layer sound-absorbing sound absorbing panel is composed of a plurality of sound-absorbing and sound-absorbing units arranged side by side, and each sound-absorbing and sound-absorbing unit comprises a rigid frame 1, an elastic film 2 and The perforated plate 3 of the through hole is formed, and the elastic film 2 is connected to the rigid frame 1, and the perforated plate 3 is connected to the elastic film 2.
  • the rigid frame 1 mainly serves to fix the elastic film 2, and a lighter and thinner material is preferable in order to reduce the weight and thickness.
  • carbon fibers having a thickness of 0.5 mm are selected.
  • the grid cell size is 20 x 20 mm and the grid cell spacing is 3 mm.
  • the elastic film 2 is preferably a relatively thin material, and perforating the film is advantageous for improving the sound insulation performance at high frequencies of the sound absorbing and sound absorbing material, but the sound insulation performance at the low frequency is decreased; the sound insulation at the low frequency is not punctured. Better performance.
  • the ratio of the pore area of the perforated to the area of the elastic film is less than 5%, and the diameter of each of the holes is less than 0.2 mm. In this embodiment, 0.1 mm thick rubber is used as the bullet. Film.
  • the preferred rigid material for the perforated plate 3 may be aluminum or plastic or ceramic, and stiffeners may be provided to increase its stiffness.
  • the perforated plate 3 is provided with a through hole having a ratio of a pore area to an area of the perforated plate of less than 20%; the through hole is a circular hole, a square hole or other irregularly shaped hole.
  • an aluminum plate having a diameter of 10 mm and a thickness of 1 mm was used; a circular hole having a diameter of 1 mm was used, and the porosity was 6%.
  • FIG. 2 is a cross-sectional view showing a second embodiment of the low-frequency sound-absorbing and sound-absorbing unit of the present invention.
  • a medium-low frequency lightweight thin-layer sound-absorbing sound-absorbing panel is arranged side by side by a plurality of sound-absorbing and sound-absorbing units.
  • Each of the sound absorbing and absorbing units comprises: a rigid frame 1, an elastic film 2, a perforated plate 3 and a connecting member 4, wherein the elastic film 2 is connected to the rigid frame 1, the perforated plate 3 and the The elastic film 2 described above is connected by a connecting member 4.
  • Rigid frame 1, elastic film 2, perforated plate 3 are the same as in the first embodiment.
  • the connecting member 4 is used for connecting the elastic film 2 and the perforated plate 3, and the contact area of the connecting member 4 with the elastic film 2 affects the effective rigidity of the elastic film 2. Therefore, the shape of the connecting member 4 can also be used to adjust the sound insulating and sound absorbing material. working frequency.
  • the connector 4 can be hollow or solid. If it is a solid and perforated thereon, the perforations do not coincide with the holes in the elastic film 2.
  • the connecting members 4 are respectively in the following two shapes: a thin ring: aluminum, an outer diameter of 5 mm, an inner diameter of 2.5 mm, and a thickness of 0.6 mm; a flat piece: plastic, a diameter of 9.5 mm, and a thickness of 0.1 mm.
  • the three materials were: traditional LRPM, new sound-absorbing sound board with thin ring connector 4, and flat connector connection.
  • Three materials at 50 - The 800 Hz mid-low frequency sound insulation spectrum curve is shown in Figure 8. The greater the amount of sound insulation of the acoustic material, the better the sound insulation effect of the material on noise. For example: When the noise energy incident on the wall is constant, the wall insulation increases by 1 dB, and the noise energy transmitted to the wall decreases by 1 dB.
  • the dotted line in Figure 8 is the traditional LRPM sound insulation curve.
  • the peak frequency of sound insulation is around 360 Hz. After this peak, there is a "peak valley” with sound insulation. The sound insulation near this "peak valley” is reduced by 5 dB.
  • the dotted line is the sound insulation curve of the new sound insulation board using the thin ring connector 4. Since the contact area of the connecting member 4 and the elastic film 2 is small, the effective rigidity of the elastic film 2 is lowered, and the peak frequency of the sound insulation of the sound insulating board is shifted to the low frequency, and the peak value of the sound insulation is increased by about 5 dB by 20 dB, at a high frequency. The sound insulation performance decreased slightly.
  • the solid line is the sound insulation curve of the new sound-absorbing sound absorbing panel using the flat member connector 4.
  • the peak frequency of the sound insulation of the sound-absorbing board is moving to high frequency (around 600 Hz).
  • the sound insulation near this frequency range is about 10 dB higher than the traditional LRPM by 22 dB, while the sound insulation near the peak frequency of the traditional LRPM is slightly reduced. .
  • the connector 4 with a thin ring can achieve very good sound insulation performance at a lower operating frequency, while the flat connector 4 can achieve better sound insulation at high frequencies by adjusting the connector. 4
  • the contact area with the elastic film 2 can adjust the working frequency of the sound insulating material, and the specific form of the corresponding connecting member 4 can be selected according to the specific needs of the actual application.
  • FIG. 3 and FIG. 4 are schematic views of a sound-absorbing and sound-absorbing panel assembly board composed of two medium-low frequency lightweight thin-layer sound-absorbing sound-absorbing panels 6 of Embodiment 2 and a flexible sound-absorbing cotton 5 therebetween.
  • the flexible sound absorbing cotton 5 is compacted in agglomerates and has a thickness of 8 mm.
  • the configuration in Figure 3 has a combined plate thickness of 10 mm and an areal density of 1.5 kg/m 2 .
  • the combined panel density of Figure 4 is the same as that of Figure 3, and the thickness is increased by 1 ⁇ 2 mm. However, when several composite panels are stacked to form a multilayer composite panel, the thickness and the thickness of the composite panel are adopted.
  • the configuration of Figure 3 is basically the same.
  • the discontinuous structure such as the conventional LRPM and the sound-absorbing sound absorbing plate described in Embodiment 2, can generate more fading waves (ie, "near-field waves"), and the attenuation wave will be repeated multiple times in the vicinity of the coupled vibration frequency of the combined board. After the reflection is superimposed, a high acoustic energy is achieved, thereby increasing the amount of energy absorbed by the sound absorbing material. The absorbing energy of the sound absorbed by the sound absorbing cotton 5 needs to be provided by the incident sound wave, thereby reducing the energy of the transmitted wave and improving the sound insulation performance.
  • the two coupled vibrating plates need to be close enough (generally less than 10 mm), so that the attenuation wave intensity between the plates can be effectively increased by the coupling of the two plates; but it should not be too close (such as 0.1 mm), so that it cannot be moved in. Fill enough sound-absorbing cotton.
  • Figure 9 is a sectional view of a composite panel using the three materials of the second embodiment (i.e., the conventional LRPM, the new sound insulating sound absorbing panel using the thin ring connecting member 4, and the new sound insulating sound absorbing panel using the flat connecting member 4).
  • Acoustic curve The dotted line in the figure shows the sound insulation curve of the traditional LRPM composite board. The performance of the single-layer traditional LRPM sound insulation "peak and valley" is significantly improved, and the sound insulation curve is flat in a wider frequency range. This is due to the attenuation of the wave loss in the composite board.
  • the dotted line is the sound insulation curve of the composite board using the thin ring connecting member 4.
  • the use of a thin ring shape can achieve very superior sound insulation performance at a lower operating frequency, while a flatter connector can achieve better sound insulation performance at a high frequency.
  • Figure 5 is a cross-sectional view of a low-frequency sound insulation and heat insulation composite wall panel according to the present invention, as shown in the figure, a medium-low frequency sound insulation and heat insulation composite wall panel, including a casing 7 connected in order from the outside to the inside, and heat insulation and sound absorption Layer 8 and composite panel 9.
  • the composite panel 9 is composed of two first coupled vibrating plates 10 and a first sound absorbing material 11 therebetween.
  • a coupled vibrating plate is an LRPM material
  • the sound absorbing material 4 is a flexible sound absorbing cotton
  • the other coupled vibrating plate is a plastic plate.
  • the composite panel 9 may be the medium and low frequency sound absorbing composite panel of Embodiment 3.
  • the housing 7 is constructed of an aluminum alloy or other composite material for structural strength requirements and is preferably a lower density material.
  • the insulating sound absorbing layer 8 is a cavity or an insulating sound absorbing cotton, preferably a dense sound absorbing cotton, mainly used for insulating heat and absorbing high frequency noise.
  • the size of the sound-absorbing sound absorbing panel 6 may be the same or different, and the material may be a homogeneous plate or a non-homogeneous plate, and is mainly used to generate strong near-field sound waves in the vicinity of the two coupled vibration plates.
  • the coupling diaphragm 10 is preferably the sound absorbing panel of Embodiment 1 or 2.
  • the coupling vibration plate 10 is preferably an LRPM material composed of a frame 7 having a plurality of meshes, an elastic film 8 and a small proton 9.
  • the sound absorbing material 11 is preferably a flexible sound absorbing cotton.
  • the flexible sound absorbing cotton is compacted in the middle of the two coupled vibration plates 10, and the compressed thickness is about 5 mm.
  • the sound absorbing material 11 mainly absorbs near-field waves and cannot affect Localized resonance of the coupled vibrating plate material unit.
  • Figure 6 shows a mid-low frequency sound insulation wall panel for the aircraft cabin.
  • the casing 7 of the commercial aircraft cabin wall panel is an aluminum alloy having a thickness of between 1. 2 mm and 2.2 mm;
  • the insulating sound absorbing layer 8 is a glass fiber cotton having a thickness of between 25 mm and 50 mm;
  • the decorative panel 12 is a phenol resin.
  • the cabin noise during the cruise phase is the main source of noise in the cabin.
  • the sound insulation of the casing is determined, and it is difficult to find alternatives with better sound insulation performance and meeting the corresponding strength and density requirements.
  • the sound absorbing material is also difficult to improve in terms of sound insulation. Therefore, the most effective way to reduce the noise in the cabin is to optimize the sound insulation material between the wall and the decorative panel, and to use the synergistic coupling between the layers to achieve the optimal sound insulation effect.
  • sound insulation materials need to have thin and light characteristics.
  • the composite panel 9 is composed of two first coupled vibrating plates 10 and a first sound absorbing material 11 therebetween.
  • the housing 7 is made of an aluminum alloy and has a thickness of 1.37 mm.
  • the insulated sound absorbing cotton 8 is made of fiberglass cotton and has a thickness of 50 mm without compaction.
  • the composite panel 9 has a thickness of about 10 mm and an areal density of 1.5 kg/m 2 .
  • the coupled vibrating plate 10 is made of LRPM material, wherein the frame is made of 0.5 mm thick plastic, the mesh unit size is 20 x 20 mm, the grid cell spacing is 3 mm, and the elastic film is made of 0.1 mm thick rubber film;
  • the protons are made of aluminum with a diameter of 10 mm and a thickness of 1 mm.
  • the sound absorbing material 11 is made of flexible sound absorbing cotton, and the flexible sound absorbing cotton is compacted into a mass of 8 mm.
  • the broken line in Fig. 10 is the sound insulation spectrum curve of the casing 7 (i.e., 1.37 mm aluminum alloy). As can be seen from the figure, the sound insulation effect of the thin plate is poor.
  • the dotted line is a plastic plate with a surface density of 1.5 kg/m 2 for the casing 1+ insulated sound-absorbing cotton 2+ single layer (ie 1.37 mm aluminum alloy + 50 mm glass fiber cotton + surface density 1.5 kg/m) 2 plastic panels)
  • the sound spectrum curve of the sound insulation In this case, the sound insulation of the double-layer thin plate is used, and the sound insulation of the frequency above 350 Hz is greatly improved as compared with the case where only one layer of the casing 7 is used, but the sound insulation effect is in the range of 150 Hz - 250 Hz. It is better to use only the sound insulation effect of the casing 7. This is mainly due to the coupling resonance of the two thin plates in this frequency range.
  • the dotted line in Figure 10 is the LRPM board with a surface density of 1.5 kg/m 2 for the casing 7+ insulated sound-absorbing cotton 8+ single layer (ie 1.37 mm aluminum alloy + 50 mm glass fiber cotton + surface density 1.5 kg / The sound insulation spectrum curve of the m 2 LRPM board). As can be seen from the figure, this configuration has two peaks of sound insulation around 400 Hz and 800 Hz, and the sound insulation effect in the frequency domain above 300 Hz is better than that of the case only case 7.
  • this configuration has a higher sound insulation at the peak of the two sound insulation; but there is a valley between the two peaks, at 440 Hz - The amount of sound insulation in the 700 Hz range is reduced by 8 - 9 dB. The peaks and valleys of these sound insulation are caused by the dynamic characteristics of the LRPM plate.
  • the solid line in Figure 10 is the casing 7 + insulated sound-absorbing cotton 8 + composite panel 9 (ie 1.37 mm aluminum alloy + 50 mm glass fiber cotton + two 0.5 mm coupled vibration LRPM board + 8 mm flexible sound-absorbing cotton 11)
  • the sound insulation spectrum curve, this configuration is the configuration applicable to the aircraft cabin wall panel of this embodiment. As can be seen from the figure, the sound insulation of this configuration is superior to the case of only the casing 7 in the entire frequency band, and there are two peaks of sound insulation, and the sound insulation amount near the peak is higher than that of the case only of the casing 7. 25 dB.
  • this configuration Compared to the case of adding a plastic plate with the same areal density (dotted line in the figure), this configuration has advantages in most frequency domains, especially in two The sound insulation near the peak frequency is increased by up to 17 dB; the sound insulation is reduced by less than 3 dB only in the narrow frequency range (420 Hz - 570 Hz). Compared with the case of adding an LRPM board with the same areal density (dotted line in the figure), this configuration can effectively improve the sound insulation characteristics caused by the single-layer LRPM board, thereby improving the frequency characteristics of the sound insulation of the aircraft compartment wall. .
  • the coupling vibration plate 10 can also be used as other materials for generating near-field waves, such as the sound insulating sound absorbing plate of Embodiment 1 and a plastic plate with a simple artificial structure.
  • the sound insulation effect of the plastic plate is slightly worse than that of the embodiment 4, but it is superior to the single layer plate having the same areal density, and the sound insulation peak and valley using the single layer LRPM plate does not occur. Since the manufacturing cost of the homogeneous board is lower than that of the LRPM board, it can be used as a low-cost solution.
  • Figure 7 is a thick composite wall panel, as shown in the figure, a medium-low frequency sound insulation and heat insulation composite wall panel, characterized in that the structure comprises a casing 7 connected in order from the outside to the inside, and the heat insulating sound absorbing layer 8 And a composite panel 9; the composite panel 9 is composed of two first coupled vibration plates 10 and a first sound absorbing material 11 therebetween.
  • the inside of the composite panel 9 is further provided with two addition groups, which are the second sound absorbing material 13 and the second coupling vibration plate 14 from the outside to the inside.
  • the first coupling vibration plate and the second coupling vibration plate are both made of LRPM material.
  • the sound insulating sound absorbing plate described in Embodiment 1 or 2 and other materials for generating near-field waves can also be used.

Landscapes

  • Building Environments (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

La présente invention concerne un panneau d'isolation et d'absorption phonique léger et fin à moyenne et basse fréquence composé d'une pluralité d'unités disposées en parallèle; chaque unité est composée d'une armature rigide, d'un film fin élastique et d'un panneau perforé présentant un trou traversant; le film fin élastique est raccordé à l'armature rigide, et le panneau perforé est raccordé au film fin élastique; deux panneaux d'isolation et d'absorption phonique avec une couche d'absorption phonique coincée entre les deux forment un panneau composite d'isolation et d'absorption phonique, de telle sorte qu'une onde de champ proche générée par les panneaux d'isolation et d'absorption phonique avance et recule à travers la couche d'absorption phonique pour dissiper efficacement l'énergie acoustique, améliorant ainsi l'effet d'isolation d'onde acoustique; le panneau composite, une couche d'isolation thermique et d'absorption phonique et un boîtier sont raccordés de manière séquentielle de l'intérieur vers l'extérieur pour former un panneau mural composite d'isolation phonique et thermique. Le panneau d'isolation et d'absorption phonique, le panneau composite et le panneau mural composite présentent un bon effet d'isolation phonique dans le domaine de fréquence basse et moyenne; et un panneau composite présentant une épaisseur de 10 mm et une densité de surface de 1,5 kg/m2 ajouté au boîtier augmente l'isolation phonique d'environ 25 dB dans une plage de fréquence précise. La présente invention est conçue pour servir de panneau mural de cabine d'avions, d'engins spatiaux, d'automobiles, de trains et de navires.
PCT/CN2014/081328 2014-01-26 2014-07-01 Panneau d'isolation et d'absorption phonique léger et fin à moyenne et basse fréquence, et panneau mural composite de celui-ci WO2015109761A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201410037510.6 2014-01-26
CN201410037510.6A CN103738037B (zh) 2014-01-26 2014-01-26 一种中低频隔声隔热复合壁板
CN201410275779.8A CN104078036A (zh) 2014-06-19 2014-06-19 中低频轻质薄层隔声吸声板及其组合板
CN201410275779.8 2014-06-19

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WO2015109761A1 true WO2015109761A1 (fr) 2015-07-30

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN106240086A (zh) * 2016-08-01 2016-12-21 太仓顺如成建筑材料有限公司 一种保温吸音新型复合墙板
CN114607091A (zh) * 2022-04-22 2022-06-10 北京首钢建设集团有限公司 一种装配式保温墙板

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CN1664920A (zh) * 2004-03-05 2005-09-07 桑德科技有限公司 声音衰减结构
CN202986208U (zh) * 2012-11-27 2013-06-12 北京市劳动保护科学研究所 一种微穿孔板薄膜粘层复合吸声板
CN103738037A (zh) * 2014-01-26 2014-04-23 上海交通大学 一种中低频隔声隔热复合壁板

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Publication number Priority date Publication date Assignee Title
CN1664920A (zh) * 2004-03-05 2005-09-07 桑德科技有限公司 声音衰减结构
CN202986208U (zh) * 2012-11-27 2013-06-12 北京市劳动保护科学研究所 一种微穿孔板薄膜粘层复合吸声板
CN103738037A (zh) * 2014-01-26 2014-04-23 上海交通大学 一种中低频隔声隔热复合壁板

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106240086A (zh) * 2016-08-01 2016-12-21 太仓顺如成建筑材料有限公司 一种保温吸音新型复合墙板
CN114607091A (zh) * 2022-04-22 2022-06-10 北京首钢建设集团有限公司 一种装配式保温墙板
CN114607091B (zh) * 2022-04-22 2024-02-02 北京首钢建设集团有限公司 一种装配式保温墙板

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