68 results about "Sound Absorber" patented technology

The present application relates to a sound absorber (1) for acoustic shielding, comprising a planar base body in which several strip-shaped sections (2a) are formed parallel to one another, each of the strip-shaped sections (2a) having two opposite edges and at least one recess (4) extending along the strip-shaped section (2a), which projects from the planar base body and through which an opening (5) with side edges (6a, 6b) is formed at each of the opposite edges. The recess (4) has an edge (4a) extending transversely to the strip-shaped section (2a) and is subdivided by the edge (4a) along the strip-shaped section (2a) into a first recess area (4b) with first side edges (6a) and a second recess area (4c) with second side edges (6b). The first side edges (6a) are curved differently than the second side edges (6b).

A laser chamber according to an aspect of the present disclosure includes a container, a first electrode, a second electrode, and a sound absorber. The container is filled with a laser gas. The first electrode is disposed in the container. The second electrode is disposed in the container and faces the first electrode. The sound absorber is disposed on at least one of an upstream side and a downstream side of the laser gas from the first electrode. The sound absorber is configured to cause a propagation speed of an acoustic wave generated in a discharge space between the first electrode and the second electrode to decrease as a distance from the discharge space increases.

The invention relates to a vehicle pneumatic tire comprising at least one sound absorber adhesively attached to an internal surface opposite the tread inside the tire, wherein the at least one sound absorber is adhered to an adhesive, and to an adhesive composition for fixing at least one sound absorber to the surface of a vehicle pneumatic tire. The adhesive contains at least the following ingredients: - from 10% to 80% by weight of at least one rubber, and - from 11% to 80% by weight of at least one polyolefin, and - from 2% to 20% by weight of at least one hydrocarbon resin. The adhesive has optimized flow characteristics and optimized tackiness.

The utility model discloses a composite absorption device for enhancing low frequency sound absorption, which belongs to the technical field of pipeline acoustics black holes, and comprises a sound tube, a plurality of micro-perforated plates and a Helmholtz sound absorber, the micro-perforated plates are distributed at equal intervals along the axial direction of the inlet end of the sound tube and are arranged from large to small according to the perforated distribution area, and the Helmholtz sound absorber is arranged on the sound tube. Micro-pores are uniformly distributed in each micro-perforated plate; every two adjacent micro-perforated plates are connected through a separation ring; the Helmholtz sound absorbers are distributed at equal intervals in the axial direction of the outlet end of the sound tube, the diameters of the gradually-changed embedded necks are gradually reduced, the center of each Helmholtz sound absorber is provided with a gradually-changed embedded neck, and the inner diameter of each gradually-changed embedded neck is gradually reduced from the inlet end to the outlet end; every two adjacent Helmholtz sound absorbers are connected through a sound absorber cavity. According to the utility model, through the combination of the composite gradually-changed micro-perforated plate and the gradually-changed cascaded Helmholtz sound absorbers which are embedded in the neck part, low-frequency sound absorption and medium-high frequency broadband sound absorption are realized under the sub-wavelength length.

This invention discloses a broadband duct silencing structure combining perforated tubes and cavities. The structure uses a galvanized housing as its main body, with perforated tubes coaxially arranged inside. A perforated partition divides the structure into front and rear silencing chambers. The front silencing chamber contains a first sound absorber and an air layer, forming a Helmholtz resonant cavity to efficiently eliminate low-frequency fan noise. The rear silencing chamber is filled with a second sound absorber and is equipped with perforated tubes, micro-perforated tubes, and micro-perforated inserts with progressively smaller apertures, forming a gradient microporous structure to achieve broadband absorption of mid-to-high frequency noise. The structure utilizes the airflow in the duct to drive the impeller to rotate, which in turn drives a bidirectional reciprocating screw via bevel gear transmission. This drives a delivery rod and a one-way valve to form a directional airflow circulation. The sound absorber is automatically purged through the air duct and comb-shaped air duct to remove fiber dust, preventing secondary pollution and stabilizing acoustic performance. This invention combines the advantages of low-frequency resonance silencing and mid-to-high frequency gradient microporous sound absorption, featuring a compact structure, wide silencing bandwidth, and stable and reliable operation.

The invention relates to a curable and preferably polymer composition that is useful as a sealant, an adhesive (e.g., structural adhesive), a reinforcement, a dampener, a sound absorber or any combination thereof. The composition preferably comprises one or more ethylene polymers, tackifier, curing agent, and rheology modifier. The invention also relates to extrusion of the composition onto an article surface, e.g. through a robotically mounted extrusion die, and subsequent activation for curing by an external stimulus.

The utility model relates to a mounting structure of an array type silencer, which comprises a shell, an accommodating space is arranged in the shell, the front end and the rear end of the accommodating space are respectively provided with an opening, and a fixing frame is arranged on the outer side of the shell in a surrounding manner; the silencer assembly is arranged in the shell and comprises sound absorbers and flow guide covers, the flow guide covers are fixedly arranged at the two ends of the sound absorbers, the sound absorbers are arranged in the containing space in an array mode, and the flow guide covers are fixedly connected with the shell; the longitudinal section of the sound absorber is wave-shaped; the supporting rod is arranged in the shell, a through hole penetrating through the upper end face and the lower end face is formed in the flow guide cover, the supporting rod penetrates through the through hole and is connected with the fixing frame, and the supporting rod is fixedly connected to the flow guide cover. By adopting the structure, the effective length of the sound absorber is increased, so that the silencing effect of the silencer is effectively improved.

The present technology relates to an information processing apparatus, method, and program that enable sound field control having a higher degree of freedom. The information processing method of the present invention involves an information processing apparatus performing the following: identifying a parameter relating to the complex acoustic impedance of a resonator, or a sound absorber that uses the resonator, installed on a surface forming a target space, said parameter being identified on the basis of a target sound pressure frequency characteristic at an evaluation point in the target space and an acoustic analysis model for obtaining the sound pressure frequency characteristic at any point in the target space; and identifying the shape of the sound absorber on the basis of the parameter. The present technology can be applied to an acoustic metamaterial.

The utility model relates to a ventilation equipment technical field especially a noise reduction type fan box device. The device includes the fan cabinet and sets up in its fan assembly, the inner wall of fan cabinet is attached with composite sound absorption cotton board to constitute primary sound absorption structure, the air outlet of fan assembly is connected with sound absorption assembly through hose joint, the sound absorption assembly includes the sound absorber and several character shape flow channel sound absorption box connected in proper order, constitutes secondary sound absorption and tertiary sound absorption structure. The utility model through in the inner wall, air outlet and export flow channel carry out multistage, compound type sound absorption and damping design, effectively widened the noise reduction frequency band, especially significantly reduced low frequency noise, guaranteed good ventilation performance simultaneously, compact structure, maintenance is convenient, effectively solved the problem that the frequency band is limited, the volume is heavy and the durability is poor in the existing fan box noise reduction technology.

The invention relates to the technical field of automobile sound-absorbing cotton detection, and particularly discloses a stretching detection device for automobile sound-absorbing cotton processing, which comprises an identification structure, a stretching device and a fixing device, and is characterized in that the identification structure is used for detecting the offset of the automobile sound-absorbing cotton after stretching; the stretching device is arranged at the front end of the top face of the bottom of the recognition structure and can synchronously stretch the two ends of the automobile sound-absorbing cotton. The number of the fixing devices is two, the two fixing devices are symmetrically arranged at the two output ends of the stretching device correspondingly, the two fixing devices can fix the two ends of the automobile sound-absorbing cotton, and the fixing devices have universality and can be suitable for automobile sound-insulating cotton of different thicknesses; the fixing device can be matched with the stretching device to carry out cotton stretching detection on automobile sound absorbers with different thicknesses; according to the invention, the stability, the detection precision and the detection quality of automobile sound-absorbing cotton detection data are effectively improved, and a reliable basis is provided for sound-absorbing cotton processing quality judgment.

The invention relates to a heat activatable, volume expandable and curable polymer composition for use as a sealant, an adhesive, a reinforcement, a dampener, and / or a sound absorber, preferably for automotive vehicles. The polymer composition is preferably pumpable and / or extrudable and has a high degree of volume expansion upon heat activation. The polymer composition is capable of bridging large gaps between substrates and filling cavities of large volume, respectively. The invention further relates to a method of producing an automotive vehicle assembly wherein a bead of the polymer composition is directly applied onto a surface of a vehicle component by means of an applicator, preferably a pump or an extruder, more preferably a pneumatic- or electric driven piston gun and optionally dispensing equipment. After immersing the vehicle component with the applied bead on its surface in one or more liquid baths and subsequently removing from said baths, the polymer composition is heated to an elevated temperature to induce curing and volume expansion of the polymer composition providing a cured foam with a low foam density.

The invention relates to a vehicle tyre (100) comprising: - a tyre inner side (101) which surrounds a tyre cavity (102), - a sound absorber (120), - an adhesive bond (140), wherein the sound absorber (120) is fastened to the tyre inner side (101) by means of the adhesive bond (140), and wherein the adhesive bond (140) has a reinforcing structure (141), - a grip region (150) which is coupled to the reinforcing structure (141) in order to release the adhesive bond (140) from the tyre inner side (101) by means of a movement of the grip region (150).

The invention discloses a micropore integrally-formed acoustic diffusion sound absorber and a preparation method. The micropore integrally-formed acoustic diffusion sound absorber comprises a sound absorption functional layer; the sound absorption structure comprises a base supporting layer, a sound absorption functional layer and a micropore diffusion layer, the sound absorption functional layer is arranged on the base supporting layer, the micropore diffusion layer is arranged at the bottom of the sound absorption functional layer, and a plurality of through diffusion holes are formed in the micropore diffusion layer, and the sound absorption structure has the following beneficial effects that through the sound absorption functional layer, the micropore diffusion layer and the base supporting layer, the sound absorption structure is integrally formed by multiple layers of composite materials; the three layers are a basic supporting layer, a micropore diffusion layer and a sound absorption function layer, all the layers are tightly combined through a specific technology to form an integrated structure, when sound waves are incident, diffusion holes can enable the sound waves to generate multiple times of reflection and scattering, sound amplification and gradient aperture design are carried out to promote uniform diffusion of sound wave energy, and the sound absorption function layer effectively converts the diffused sound energy into heat energy. Progressive attenuation of sound energy is formed by the whole structure, and it is guaranteed that the sound absorption structure can have the dual functions of sound wave diffusion and absorption at the same time.

The utility model discloses a rock wool space sound absorber with a composite structure, and belongs to the technical field of sound absorption structures, the rock wool space sound absorber with the composite structure is characterized by comprising an outer frame, and a composite sound absorption assembly is arranged in the outer frame. The interception structure reflects sound waves in a specific frequency band and converts part of sound energy into heat energy to be consumed according to the unique design of the interception structure and the reflection sound reduction principle, the high-frequency noise is remarkably weakened, the rock wool layer located in the outer frame gives full play to the porous sound absorption characteristic of the rock wool layer, sound shuttles among fiber pores of the rock wool layer, and the sound absorption effect is improved. Due to the effects of friction, viscosity and the like, a large amount of sound energy is converted and absorbed, the sound energy does not release any absorbable sound energy like a layer-by-layer filter screen, the sound energy and the sound energy supplement each other, and both high-frequency sharp noise and low-frequency dull roar can be effectively intercepted.

The pipeline silencer comprises a shell and a silencing assembly arranged in the shell, the silencing assembly comprises a first silencing section, a second silencing section and a third silencing section which are connected with one another, the first silencing section comprises a first silencing cylinder and a plurality of silencing pieces obliquely arranged in the first silencing cylinder, and the third silencing section comprises a second silencing cylinder and a plurality of silencing pieces obliquely arranged in the second silencing cylinder. The second silencing section comprises a first connecting cylinder, a second silencing cylinder and a second connecting cylinder which are connected with one another, the diameter of the second silencing cylinder is larger than that of the first silencing cylinder, the third silencing section is made of a third silencing cylinder, and a plurality of silencing holes are formed in the cylinder wall of the third silencing cylinder. According to the pipeline silencer, the silencing assembly is arranged, the silencing cotton is arranged on the inner cylinder wall of the first silencing cylinder, and the silencing sheet is obliquely arranged on the pipe wall of the first silencing pipe, so that the contact time of airflow and the sound absorption structure is longer, and the utilization rate of the sound absorption structure is higher; therefore, the sound absorption efficiency in the cavity of the whole sound absorber is high.

The invention discloses a 3D (three-dimensional) hollow composite roof applied to a large-span railway vehicle, which sequentially comprises an outer skin layer, an upper bearing layer, a three-dimensional hollow woven core layer, a lower bearing layer and an interior base layer from outside to inside, and is characterized in that the three-dimensional hollow woven core layer is formed by integrally weaving Z-direction penetrating fiber columns and X-direction or Y-direction space rib belts; a hollow cavity with a variable aperture can be formed, and aerogel, a micropore sound absorber, a phase change temperature control material, flame-retardant ceramic fibers or electromagnetic shielding metal fibers can be filled in the cavity according to requirements. The top plate is integrally formed by adopting a three-stage resin injection curing process, so that fibers are continuously penetrated in three directions, and the interlayer stripping risk is thoroughly eliminated. Through the synergistic effect of the three-dimensional overall structure design and the functional materials, remarkable light weight, excellent bending and shearing strength and good sound insulation and heat insulation performance are achieved, and the requirements for flame retardance and electromagnetic shielding can be met. The process can form a large-size integral top plate, and has the advantages of high structural reliability, high function integration level and the like.

The application relates to a combined acoustic black hole sound absorption body structure and a design method. The structure comprises a cross-shaped partition plate, a cylindrical cavity, a bottom plate, four groups of 1 / 4 annular thin plate arrays, the number ratio of the four groups of 1 / 4 annular thin plate arrays is 30:25:20:17, the plate thickness and the interval are equal, the cross-shaped partition plate divides the cylindrical cavity into four independent 1 / 4 cylindrical cavities with equal volumes, the four groups of 1 / 4 annular thin plate arrays are respectively located in the four 1 / 4 cylindrical cavities, and the bottom plate is located at one end of the 1 / 4 annular thin plate without an annular partition plate with the smallest inner diameter and seals the end. The application calculates the sound absorption coefficient of the combined acoustic black hole sound absorption body by constructing a transfer matrix model of a single 1 / 4 acoustic black hole sound absorption body, and optimizes the structure length of the single 1 / 4 acoustic black hole sound absorption body and the number of 1 / 4 annular thin plates, so that the structure can stably absorb the medium and high frequency noise. The application has the advantages of simple structure, low cost and stable wideband sound absorption.

This utility model discloses a decorative sound absorber, characterized in that it comprises an inner sound-absorbing soft pad and an outer sound-absorbing polyester body. The outer sound-absorbing polyester body has a cavity for accommodating the inner sound-absorbing soft pad. The inner sound-absorbing soft pad includes sound-absorbing cotton and an outer covering fabric, which has a comfortable feel to the touch, unlike the hard feel of traditional decorative paintings. In particular, it can prevent children from being scratched or bumped. It will not be damaged if dropped, nor will it damage any objects that come into contact with it. Its durability is higher than that of traditional decorative paintings. This utility model has good sound absorption effect and a comfortable feel.

1. Name of the product in this design: Ventilation frame sound absorber. 2. Purpose of this design: To be installed on an automotive ventilation frame to absorb noise transmitted into the vehicle through the ventilation frame. 3. The key design feature of this product is its shape. 4. The picture or photo that best illustrates the key design points: Design 1 3D diagram 1. 5. Design 1 is designated as the basic design.

The utility model relates to a green building with a light energy utilization device, which comprises a steel structure building main body part and a roof part fixed at the top of the steel structure building main body part, the roof part comprises a top surface unit, a porous panel, a sound absorber, a flexible photovoltaic panel, two groups of lighting units and two groups of roof skin steel plates, a plurality of mounting grooves are formed in the top surface unit, a porous panel fixedly connected with the top surface unit is arranged in each mounting groove, and sound absorbers are arranged on the inner sides of the porous panels. Through cooperative arrangement of the top surface unit, the porous panel, the sound absorber, the flexible photovoltaic panel and the illumination unit, the roof part can better utilize illumination to assist power generation and energy supply, noise generated when rainwater drips on the roof can be reduced in rainy days, in addition, the overall illumination effect of a building can be improved, and the construction cost is reduced. And therefore, the whole steel structure building can be greener and more environmentally friendly, and energy is saved.

The invention relates to the technical field of aircraft noise reduction, in particular to a duct noise reduction method and device based on electric vertical take-off and landing design, and the method comprises the steps: determining target noise to be subjected to noise reduction of an eVTOL aircraft duct; based on the target to-be-denoised noise and a preset resonant frequency expression of a Helmholtz resonator, target Helmholtz resonator units meeting different frequency requirements are obtained, and corresponding resonant noise reduction unit parameters are determined according to the target Helmholtz resonator units; based on the resonance noise reduction unit parameters, determining a distribution proportion corresponding to the target Helmholtz resonator unit so as to distribute the target Helmholtz resonator unit in an acoustic liner of an eVTOL aircraft duct, and constructing a target sound absorber; and noise reduction is performed on blade passing noise and tubular cavity resonance noise generated in the operation process of the eVTOL aircraft based on the target sound absorber. Therefore, the problems of serious noise pollution and the like caused by the eVTOL aircraft are solved.

Provided in the present invention are a method for designing a causally optimal broadband acoustic metamaterial sound absorber, and a sound absorber. A new method for designing and manufacturing a metamaterial sound absorber to realize causally optimal broadband absorption (COBA) is introduced. The method involves three key steps: (1) calculating a COBA spectral line by means of solving an optimization problem based on a causal constraint; (2) designing a resonator array, the modal density and resonance strength of which match the COBA spectral line; and (3) using a mass production method, such as a mold forming process, to manufacture a sound absorber. As a result, compared with conventional porous sound absorbers, a produced acoustic metamaterial sound absorber shows a better broadband absorption performance under a given thickness constraint, particularly within a low frequency range. The present invention represents a significant advancement in the development of a high-performance and space-saving noise control solution.

The invention relates to a combined muffler, which comprises a shell, a first small-hole muffler, a second small-hole muffler and a sound absorber, wherein the shell is provided with an inlet and an outlet for fluid, the first small-hole muffler is connected to the inlet of the shell, the second small-hole muffler is sleeved on the outside of the first small-hole muffler and forms a cavity with the first small-hole muffler, and the sound absorber is installed in the shell outside the second small-hole muffler to absorb the medium and high frequency noise in the fluid from the second small-hole muffler, characterized in that it further comprises a diffuser outside the shell, the diffuser is provided with an axial through taper hole, the cross section of the outlet end of the taper hole is larger than that of the inlet end, and the outlet end is fixed to the inlet of the shell and connected to the inlet of the shell. The muffler of the invention has the advantages of high sound absorption and low resistance, and can meet the use requirements of the system.

The invention provides a sound system and an in-vehicle communication support system, which can suppress the disadvantage of ultrasonic radiation through a parametric speaker and increase the reproduction level of audible sound. Ultrasonic waves, which have been amplitude-modulated with audible sound emitted from a parametric speaker (1), are incident on an audible sound collector (2) with high directivity. The audible sound collector (2) attenuates incident ultrasonic waves and ultrasonic waves in audible sound self-demodulated from the ultrasonic waves, reflects the audible sound, and collects sound at a position in the vicinity of a user. The audible sound collector (2) can be configured from a reflector (21) having a reflecting surface that is a paraboloid of revolution and a sound absorber (22) that absorbs sound of ultrasonic waves, and the sound absorber (22) can be configured using an inverter tube (221) and a sound absorbing material using a photonic crystal.

An absorber is positioned in a front volume of an audio speaker to minimize standing waves. An absorber may include a component that includes a channel with a length selected based on a characteristic (e.g., frequency) of the acoustical output of the audio speaker. Additionally, an absorber may include a resistive element to dampen the acoustical output of the acoustical output. Absorbers may be oriented horizontally or vertically in a front volume, and may be in a folded or fractal configuration.

The invention relates to a sound absorber comprising a frame with at least two opposing, elongated frame elements, at least one functional device arranged inside the frame, a cover which, in the assembled state, is stretched by the frame at least on one side facing a room, wherein the cover comprises or consists of a woven, knitted and / or crocheted fabric, and at least one strut which extends between the frame elements, wherein the frame elements each have at least two retaining grooves for selectively holding the strut, wherein the retaining grooves are arranged at different heights.

The objective of the present invention is to provide a broadband metamaterial silencer for ventilation ducts, a design method therefor, and applications thereof, which address the problems existing in broadband noise reduction technology for ventilation ducts, and belong to the noise processing technical field. One technical solution provided by the present invention is a broadband metamaterial silencer for ventilation ducts, which may be a broadband metamaterial silencer installed outside a pipe, a broadband split-flow metamaterial silencer built into a duct, or a broadband metamaterial degenerated sound absorber. The present invention also provides a design method for the broadband metamaterial silencer for ventilation ducts, as well as technical solutions related to its application in wearable devices, indoor and outdoor air conditioning equipment, and home appliances. The silencer of the present invention can effectively reduce broadband noise in pipes.

The utility model discloses a novel metal micropore acoustic metamaterial silencer which comprises a silencer shell, an ultra-micropore connecting plate is arranged on the inner side of the silencer shell, and a plurality of sound absorbers are detachably arranged on the inner side of the ultra-micropore connecting plate at intervals. The sound absorber is a rectangular ultra-micropore cavity silencing sheet with a cavity layer or a V-shaped ultra-micropore cavity silencing sheet with a cavity layer, and flanges are arranged on the periphery of the outer side of the silencer shell. The novel metal micropore acoustic metamaterial silencer is wide in sound absorption frequency band and good in noise reduction effect, the average sound absorption coefficient within the frequency range of 160-2000 HZ is larger than 0.75 or above, compared with a traditional silencer, the ventilation rate is improved by 30%, the internal flow speed and resistance are greatly reduced, the noise reduction and silencing effect and the economic benefit of equipment are greatly improved, and the novel metal micropore acoustic metamaterial silencer is suitable for popularization and application. And on the premise of ensuring the optimal sound absorption and noise reduction efficiency, the product manufacturing cost is low, the practical value is obviously improved, and large-area popularization and application are facilitated.

This invention provides a cavity-adjustable array micro-perforated sound absorber and its design method, belonging to the field of low-frequency vibration reduction and noise reduction. The sound absorber has a rectangular modular structure, consisting of an array of micro-perforated plates (assembled from multiple micro-perforated plates), a main frame, a sliding cavity plate assembly, and a rear-sealed large back plate, arranged sequentially along the sound wave incident direction. Here, and represent the number of rows and columns on one side of the independent cavity channels divided within the main frame. The perforated plates exhibit a perforation rate gradient distribution characteristic, and each cavity-adjustable sub-micro-perforated sound absorber has an effective cavity depth exhibiting an in-plane gradient distribution characteristic. Furthermore, the array of micro-perforated plates is arranged in a concentric matrix topology. This invention achieves extreme broadband impedance matching and targeted low-frequency absorption enhancement under finite thickness constraints by constructing an adjustable cavity, a dual-gradient evolution mechanism of perforation rate and cavity depth under constant aperture, and combining this with a concentric matrix topology arrangement radiating outwards from the low-frequency core.