50 results about "Acoustic absorption" patented technology

An acoustic absorbing filler, the acoustic absorbing filler comprising agglomerates comprising a first phase comprising a plurality of porous particulates and a second phase comprising a binder; wherein the acoustic absorbing filler has a median sieved particle size of from 100 micrometer to 700 micrometers and a specific surface area of from 50 m2 / g to 900 m2 / g; wherein the acoustic absorbing filler has a normal incidence acoustic absorption of no less than 0.20 alpha at 400 Hz.

The invention provides underwater acoustic response and positioning integrated sensing equipment, a positioning method and a control method, and the sensing equipment comprises a suspension supporting structure and a spherical receiving hydrophone which is used for receiving a sound wave signal to judge a target distance; the sound absorption part is used for realizing receiving and transmitting isolation of sound wave signals; the circular tube transmitting transducer is used for transmitting a sound wave signal; the double-ring receiving hydrophone is used for receiving the sound wave signal to judge the target orientation; the spherical receiving hydrophone, the pressure-resistant electronic cabin, the sound absorption part, the circular tube transmitting transducer and the double-ring receiving hydrophone are sequentially and coaxially arranged in the cylindrical structure from top to bottom in the gravity direction; by adopting the equipment disclosed by the invention, the functions of transmitting, receiving and positioning can be simultaneously realized, and the positioning and control requirements of underwater engineering equipment can be met.

An acoustic treatment panel including acoustic absorption cells each comprising a bottom wall, a porous inlet wall, an enclosure extending in an axial direction between the bottom wall and the inlet wall, and a first acoustic horn extending inside the enclosure between a first opening and a second opening that is smaller than said first opening, the first opening facing said inlet wall. Each cell comprises a second horn extending inside the enclosure in the first axial direction between a first opening of the second horn and a second opening of the second horn that is smaller than said first opening.

An acoustic absorption structure including a cellular structure which comprises tubular cells, closed at each of their ends by an acoustically resistive layer and a reflective layer, and at least one individual partitioning system, placed in a single cell and including a partition configured to separate the cell into first and second compartments, at least one opening passing through the partition, several feet independent of the conduit, having a first end connected to the partition and a second end in contact against the reflective layer, and at least one conduit which has a first end rigidly secured to the partition surrounding the opening and a second end spaced apart from the reflective layer.

The present invention provides an ultrasonic sensor with an acoustic absorption structure and a preparation method thereof. The ultrasonic sensor includes: a MEMS chip having a front cavity and a back cavity; a first wafer having at least one acoustic hole, the first wafer being disposed on the MEMS chip and the first wafer being located in the back cavity of the MEMS chip; and an acoustic absorption structure disposed on the first wafer, and the acoustic absorption structure being located on a side of the first wafer away from the MEMS chip. The present invention provides an ultrasonic sensor with an acoustic absorption structure and a preparation method thereof, which can effectively absorb the ultrasonic waves in the back cavity, thereby reducing the blind zone time of the ultrasonic sensor. By adopting a bonding process, the cost is low, the yield is high, the size is small, and the reliability is high.

The utility model relates to the technical field of seat ventilation, in particular to an air supply structure of a seat for a public building, which comprises a bottom plate fixedly arranged on a supporting surface, a stand column fixedly arranged on the bottom plate, a seat fixedly arranged at the top end of the stand column, the stand column is of a hollow structure, and a plurality of ventilation holes are formed in the side wall of the stand column. A ventilation pipe is fixedly arranged in the stand column in a penetrating mode, the bottom end of the ventilation pipe is connected with an air source, the top of the ventilation pipe is rotationally sleeved with an air ball assembly, the air ball assembly comprises a sleeve rotationally arranged at the top of the ventilation pipe in a sleeving mode, an air ball is fixedly arranged at the top of the sleeve, a top plate is fixedly arranged at the top of the air ball, and an air outlet is formed in the side wall of the air ball; air outlets of the ventilation pipes are higher than through holes in the stand columns, cleaning water flow or dust outside the stand columns is prevented from entering ventilation pipelines, and equipment cleanliness is guaranteed; the air ball at the top end of the air outlet pipe rotates and exhausts air, noise is reduced, air supply is softer, comfort is enhanced, the sound absorption ring is installed on the periphery of the air ball, and noise is further reduced.

The invention discloses a sound absorption structure, an air outlet head and air treatment equipment, and relates to the technical field of life electric appliances, the sound absorption structure is applied to the air treatment equipment, an air duct is arranged in the air treatment equipment, and the sound absorption structure comprises a plurality of sound absorption channels and a plurality of sound absorption holes correspondingly communicating with the sound absorption channels; the sound absorption structure is communicated with the air channel through the sound absorption holes, the sound absorption channels are not communicated with one another, and the total lengths of at least two sound absorption channels are different. According to the technical scheme, the sound absorption structure can have the noise reduction characteristic that the sound absorption frequency and the sound absorption coefficient can be adjusted at will, and then noise of equipment applying the sound absorption structure is reduced.

The present application relates to a method, device, and apparatus for managing an acoustic metamaterial database. The method includes: constructing a general acoustic metamaterial database based on mesh model files and point cloud files corresponding to various acoustic metamaterial models, as well as a table of acoustic absorption coefficients of the acoustic metamaterial models calculated using simulation modeling software; using the acoustic metamaterial configuration, material type, number of material phases, point cloud file path, and sound absorption coefficient table path in the general acoustic metamaterial database as keys, and the specific data information corresponding to each key as values, to create a dictionary file based on key-value pairs; querying and accessing all files in the general acoustic metamaterial database through the key-value pairs in the dictionary file, and performing database management interaction and data set generation. This method can achieve the aggregated representation of the three-dimensional spatial features of acoustic metamaterials, and use this as a support to construct a general database, develop database interaction functions, and achieve simple and fast database management.

An acoustic absorption structure including a cellular structure that includes at least one cell delimited by at least one wall and at least one partition system. The system includes at least one subsystem positioned in the cell and adapted to divide it into at least two cavities and at least one tongue connected to the subsystem and having a hook shape straddling one of the first and second edges of the wall. The tongue facilitates installing and retaining each partition system in the cell.

An acoustic absorption assembly and a fan device, the acoustic absorption assembly is detachably arranged on the fan and includes a first plate member and a second plate member. The first plate member is arranged on the fan in a detachable manner and includes a plurality of first acoustic absorption structures. Each of the plurality of first acoustic absorption structures includes a first sound transmission slot, at least one first acoustic absorption slot, and at least one first neck passage. The at least one first acoustic absorption slot is communicated with the first sound transmission slot through the at least one first neck passage. The second plate member is detachably arranged on the first plate member and includes a plurality of second acoustic absorption structures. Each of the plurality of second acoustic absorption structures includes a second sound transmission slot, at least one second acoustic absorption slot, and at least one second neck passage. The at least one second acoustic absorption slot is communicated with the second sound transmission slot through the at least one second neck passage. The plurality of first acoustic absorption structures correspond to the plurality of second acoustic absorption structures respectively, and together form a plurality of Helmholtz resonance acoustic absorption cavities.

The application discloses polyurethane foam with high sound absorption coefficient and a preparation method thereof, and relates to the technical field of polyurethane foam materials. The polyurethane foam is prepared by the reaction of component A and component B. The component A comprises the following raw materials in parts by weight: polyether polyol 45-55 parts, polymer polyol 35-40 parts, amine catalyst 0.01-0.03 parts, pentamethyl dipropylene triamine 0.5-2.0 parts, tin catalyst 0.01-0.03 parts, water 1-3 parts, pore opener 3-4 parts, and mixed silicon oil 1.2-1.6 parts. The component B is diphenyl methane diisocyanate, and the amount of the component B is 70-90 parts by weight. By introducing pentamethyl dipropylene triamine as a synergistic catalyst in a specific amount, the foam pore structure and the open porosity of the foam can be significantly optimized, and the prepared polyurethane foam has significantly improved sound absorption performance in the medium and low frequency range.

The present invention discloses a sound absorption and insulation structure based on powder energy absorption, which comprises a perforated plate, a sound insulation material, a thin cover plate and an acoustic black hole plate stacked in sequence. A plurality of groove structures distributed in an array are arranged on the acoustic black hole plate. The groove structures are matched with the surface of the thin cover plate to form a closed cavity, and the cavity is filled with a powder energy absorption material. Compared with the existing sound absorption and insulation structures, the powder energy absorption method is adopted in this device, which can better absorb the sound wave energy generated by noise, thereby reducing the further noise pollution phenomenon caused by multiple reflections, and effectively reducing the noise level.

Methods and apparatuses for reducing the transmission of unwanted sound and vibration energy generated by dynamic and / or impact loads through floors in multi-story buildings. This may be accomplished using an acoustic wave transformation and attenuation sound proofing membrane including an acoustic wave transformation layer, an acoustic absorption layer, and a constrained vibration damping layer. The acoustic wave transformation layer may be capable of transforming acoustic waves in a manner that may easily be attenuated by the acoustic absorption and constrained vibration damping layers. The sound proofing membrane may be used with several different combinations of floor coverings, adhesives, and subfloors. Impact acoustical tests have demonstrated that the sound proofing membrane can achieve higher IIC and HIIC ratings compared to conventional acoustic underlayments and / or membranes and, thus, prevent unwanted dynamic and / or impact loads from disturbing occupants in rooms beneath the floor assembly.

An acoustic absorption structure including at least one cellular structure between an acoustically resistive layer and a reflective layer. The cellular structure includes a first face in contact with the acoustically resistive layer, a second face in contact with the reflective layer, and a multitude of cells each discharging at the level of the first and second faces, each cell being delimited by at least one partition, wherein the cellular structure comprises at least one partitioning enclosure positioned in one of the cells of the cellular structure and connected to at least one partition delimiting the cell. The partitioning enclosure separates an interior zone inside the partitioning enclosure and an exterior zone situated in the cell and outside the partitioning enclosure. The partitioning enclosure includes at least one through-orifice configured so that the interior and exterior zones communicate.

The present disclosure provides a laser chamber, a gas laser device, and a method of manufacturing an electronic device. A laser chamber of one aspect of the present disclosure includes a container filled with a laser gas; a first electrode disposed in the container; a second electrode disposed in the container in an opposed state to the first electrode; and an acoustic absorption material disposed on at least one of an upstream side and a downstream side of the laser gas with respect to the first electrode, so that a propagation speed of a sound wave generated in a discharge space between the first electrode and the second electrode is reduced in a direction away from the discharge space.

The present invention introduces a novel approach to sound absorption in cross-laminated timber (CLT) panels by integrating acoustic absorption into the bottom ply. This eliminates the need for external sound absorbing finishes which are costly and obscure the exposed wood aesthetic. Comprised of channels filled with sound-absorbing material, the absorbers target a broad range of frequencies relevant to architectural applications. This feature is incorporated within the standard CLT lay-up and glueing process. By strategically removing material where it minimally affects panel strength, the CLT panels maintain robustness as a structural member, enhancing room acoustics while preserving the natural wood aesthetics and structural qualities of CLT. In architectural and construction contexts, this integration of acoustic absorption offers a practical and efficient solution to a known limitation of mass timber construction.

To provide a surface material of an underwater structure, which can reduce an amount of sound waves returning to a generation source.SOLUTION: A surface material according to one embodiment of the present disclosure forms a surface part of an underwater structure, and includes: a sound absorption layer which is positioned in an outermost portion of the surface material and absorbs a sound wave; and a reflection layer which is positioned inside the sound absorption layer of the surface material and reflects the sound wave transmitting through the sound absorption layer at a reflection angle different from an incident angle.SELECTED DRAWING: Figure 1

The invention relates to a silent communication face mask (1) intended to be placed on the head of a user (5), comprising: a shell (2) configured to cover the mouth and nose of the user (5), said shell (2) having at least one exhalation vent (14), at least one microphone (3) carried by the shell (2) and arranged so as to capture and transmit the user's speech (5), an acoustic absorption device (4) extending within the shell (2), the mask (1) having at least one first movable element (20) configured to adopt an open configuration of the exhalation vent (14) under the effect of the pressure of air exhaled by the user (5) and to adopt a closed configuration of the exhalation vent (14) in the absence of exhaled air, thus rendering the user's speech (5) unintelligible. Figure for the abstract: Fig. 1

The application provides an acoustic absorption assembly applied to an extractor hood, the extractor hood comprising a hood body, comprising: a fixed support comprising a base fixedly connected and a plurality of spaced support cantilevers, the base being used for fixedly connecting with the hood body; a free end of the support cantilevers away from the base being provided with an anti-falling protrusion; an acoustic absorption piece being provided with a plurality of assembly through holes matched with the support cantilevers, the assembly through holes being provided in one-to-one correspondence with the support cantilevers; the free end of the support cantilevers being used for extending into the assembly through hole to abut against an end side of the acoustic absorption piece through the anti-falling protrusion, so as to support and hang the acoustic absorption piece through the support cantilevers and limit the movement of the acoustic absorption piece along the support cantilevers through the anti-falling protrusion; and a radial dimension of the anti-falling protrusion being determined based on stress and deformation analysis of preset parameters of the acoustic absorption piece. The acoustic absorption piece is hung and fixed in the hood body through the support cantilevers, has small space occupation, and has good acoustic absorption and noise reduction effect.

The present disclosure provides a combustion chamber and a method, device and equipment for determining parameters of an acoustic absorption structure in the combustion chamber, and relates to the technical field of aero-engines. The combustion chamber comprises a flame tube composed of a heat source mounting surface arranged in a radial direction, and a side wall surface arranged in an axial direction on a first side of the heat source mounting surface; and an acoustic absorption structure arranged on at least one of the heat source mounting surface and the side wall surface. The present disclosure can effectively suppress low-frequency mode combustion instability in the combustion chamber.

The invention relates to the technical field of NVH (Noise Vibration and Harshness) control of an electric drive system of a new energy automobile, and discloses an acoustic bag for the electric drive system of the new energy automobile, which is characterized by comprising a sound absorption layer and a composite sound insulation layer, the composite sound insulation layer is an EPM (Ethylene-Propylene-Metallic) rubber layer with two sides covered with PET (Polyethylene Terephthalate) non-woven fabrics, and the sound absorption layer is a foaming PU (Polyurethane) layer; the double-faced PET-coated non-woven fabric comprises a first PET non-woven fabric layer and a second PET non-woven fabric layer, the EPM rubber layer is coated with the first PET non-woven fabric layer, and the first PET non-woven fabric layer makes contact with the foaming PU layer and is used for improving the bonding strength of the EPM rubber layer and the foaming PU layer; and the second PET non-woven fabric layer covers the outer surface of the EPM rubber layer and is used for improving the surface scratch resistance and improving the supporting property of the acoustic bag after high-temperature aging. According to the acoustic bag, by improving the structural design and material combination, the defects of a traditional acoustic bag in the aspects of interface bonding strength, tensile formability and supporting performance after high-temperature aging are effectively overcome.

The invention relates to a porous material sound absorption structure design method and device, electronic equipment and a storage medium, and the method comprises the steps: building a sound absorption mathematical model based on a rubber material and a porous material, obtaining a target function for maximizing the acoustic performance, and adding constraint conditions for optimizing the target function, randomly generating an initial design meeting the target function and the constraint condition; carrying out optimization processing on design variables in the initial design based on density filtering and projection; a wave finite element method is adopted to calculate the sound absorption coefficient of the porous material sound absorption structure corresponding to the optimized initial design; evaluating the sensitivity of the design variable to the objective function and the constraint condition based on the sound absorption coefficient; and updating the design variable based on a moving asymptote method, repeating the previous steps until a preset iteration requirement is met so as to output a result of the final optimized design variable, and outputting the porous material sound absorption structure based on the result.

This invention relates to a method for measuring the acoustic absorption coefficient of the shallow seabed, comprising the following steps: measuring the seawater depth of the experimental sea area using an echo sounder; measuring the average sound energy density generated by rainfall using a hydrophone vertical array; measuring the rainfall intensity using a rain gauge; measuring the sound power radiated underwater by rainfall per unit area of ​​the sea surface; and calculating the acoustic absorption coefficient of the shallow seabed. The measurement method of this invention has a clear principle, and by measuring the underwater noise generated by rainfall, it can cleverly measure the acoustic absorption coefficient of the shallow seabed across the entire frequency band.

The invention discloses a GA-BPNN-based focus area tissue in-situ sound absorption energy inversion method and system. The method comprises the following steps: calculating a mechanical response displacement value of focus area tissue under the action of sound radiation force; converting into a k space-frequency domain product relationship by using a convolution theorem; and constructing a GA-BPNN model: optimizing an initial weight and a threshold value of a BP neural network by using a genetic algorithm, training to obtain the GA-BPNN model, predicting acoustic radiation force by using the GA-BPNN model, and then inverting acoustic absorption energy distribution of the focus area by using the k space-frequency domain product relationship through Fourier inverse transformation. The method aims at solving the problems that a current detection method for evaluating sound field measurement associated with sound absorption energy is difficult to meet in-situ sound absorption energy evaluation of FUS related equipment in a focus area, and FUS safety and curative effect are reduced. A large amount of complex programming work can be avoided, and a prediction model related to the acoustic radiation force can be established only through limited tests.

The invention relates to a sound insulation structure and a preparation method thereof, and the sound insulation structure comprises a sound absorption layer and at least one sound insulation layer; the sound insulation layer is coated on at least one surface of the sound absorption layer; the sound absorption layer comprises a void material frame and acoustic nano-particles and aerogel distributed in the void material frame, the distribution density of the acoustic nano-particles gradually decreases in the direction perpendicular to the sound insulation layer, and the aerogel is uniformly dispersed; the acoustic nanoparticles are selected from iron oxide and / or zinc oxide. The sound insulation structure has the beneficial effects that the prepared sound insulation structure has an excellent sound insulation effect, the sound insulation performance of the sound insulation structure is improved by more than one time compared with that of a common material, and the sound insulation structure can be widely applied to sound insulation scenes of building areas or other fields with high sound insulation requirements.

The invention relates to the technical field of sound insulation materials, and discloses a sound insulation and noise reduction automobile foot mat and a preparation process thereof. Comprising the following operation steps: step 1, sequentially heating and melting thermoplastic elastomers, injecting the thermoplastic elastomers into a mold, and maintaining the pressure for 15-25 seconds to obtain a base layer; step 2, (1) banburying modified melamine and ethylene propylene diene monomer, adding a foaming agent, a foaming promoter and a vulcanizing agent, and continuously banburying and mixing to obtain a rubber compound; (2) blade-coating the rubber compound on the surface of the base layer, and obtaining a sound absorption layer through a foaming process; step 3: (1) banburying and mixing the sound insulation material for 10-15 minutes, taking out and calendering to obtain a sound insulation layer; (2) coating the surface of the sound absorption layer with a hot melt adhesive, then coating the sound absorption layer with a sound insulation layer, and carrying out hot pressing treatment at 80-90 DEG C for 8-15 minutes to obtain a prefabricated automobile foot mat; and 4, a protective layer is attached to the surface of the prefabricated automobile foot mat in a hot-pressing mode, trimming machining is conducted, and the sound insulation and noise reduction automobile foot mat is obtained.

The present invention relates to a sound-absorbing and noise-reducing protection device based on an outdoor ring main unit, which includes a base. A box body is fixed on the top of the base. A box door is hinged to the front side of the box body. A top plate is fixed on the top of the box body. Rainproof and exhaust seats are fixed on both the left and right sides of the box body. A dust-proof net is assembled on the rainproof and exhaust seats. The box body includes an outer shell. The outer shell is fixed between the base and the top plate. A sound-insulating frame located inside the outer shell is fixed between the base and the top plate. The sound-absorbing and noise-reducing protection device based on the outdoor ring main unit is provided with a box body, which is composed of an outer shell, a sound-insulating frame, an inner shell and a heat-conducting shell. There is an exhaust gap between every two of the four components, which is convenient for air circulation and heat dissipation. The outer shell and the inner shell play a role in improving the strength of the box body. The components assembled inside the sound-insulating frame are used for noise reduction and sound absorption to reduce noise emission. The heat-conducting shell can absorb the heat generated by the operation of the components in the box body and conduct the heat for dissipation.

Acoustic absorption structure comprising compartmentalized cells combining several types of resonators. The invention relates to an acoustic absorption structure comprising a honeycomb structure (62), interposed between an acoustically resistive layer (64) and a reflective layer (66), which includes walls (68) delimiting cells (70) and, for at least one cell (70): at least one and at most three L-shaped partitions (72, 72'), impermeable and spaced apart, which delimit a straight compartment (70.1) and at least one L-shaped compartment (70.2, 70.3), in each L-shaped compartment (70.2, 70.3), an inclined acoustically resistive porous partition (80, 80') which has an openness ratio less than or equal to 15% and divides the L-shaped compartment (70.2, 70.3) into first and second zones (80.1, 80.2, 80.1', 80.2') forming two types of resonators. This arrangement increases the frequency range of the processed acoustic waves.The invention also relates to an aircraft comprising at least one such acoustic absorption structure. Figure 7.

The utility model discloses a sound absorption component for a sound barrier, which is characterized in that the internal material is a fiber sound absorption material, waterproof sound absorption coating is sprayed on the surface of the fiber sound absorption material, the waterproof sound absorption coating is cured into a film, and the surface of the fiber sound absorption material is bonded to form a composite sound absorption material. The sound absorption assembly for the sound barrier is not only good in mechanical property, high in hydrophobicity, strong in weather resistance and medium resistance, but also excellent in sound absorption and noise reduction performance.