65 results about "Noise attenuation" patented technology

The invention relates to the technical field of aircrafts, and discloses a noise-considered urban low-altitude unmanned aerial vehicle path optimization method, which comprises the steps of urban environment rasterization and environment parameter setting; constructing an unmanned aerial vehicle noise attenuation model; calculating a noise interference critical distance and building sensitivity weight assignment; solving a noise interference grid matrix; a low-altitude unmanned aerial vehicle path planning model; and improving A * algorithm design. According to the method, the urban environment is rasterized, environmental parameters are set, an outdoor noise attenuation model is established by integrating geometric divergence, atmospheric absorption, ground effect and other factors, the propagation law of unmanned aerial vehicle noise in a complex environment is accurately described, the overall noise exposure and the sensitive area noise exposure are remarkably reduced while the flight safety is guaranteed, and the unmanned aerial vehicle noise attenuation performance is improved. The calculation efficiency is improved through the critical distance, path redundancy is avoided, collaborative optimization of noise control and operation efficiency is achieved, and technical support is provided for standardized operation of urban ultra-low-altitude unmanned aerial vehicles.

The utility model belongs to the technical field of reactors, and particularly relates to an extra-high voltage shunt reactor oil tank composite noise reduction structure which comprises a rubber plate fixedly installed in an oil tank wall, the outer side of the rubber plate is attached to the surface of the inner side wall of the oil tank wall, and a sound absorption hole-free paperboard is fixedly installed on the inner side of the rubber plate. A double-layer composite perforated plate sound absorption mechanism is fixedly installed on the inner side of the sound absorption hole-free paperboard, gaps are reserved among the rubber plate, the sound absorption hole-free paperboard and the double-layer composite perforated plate sound absorption mechanism, and a gap is reserved between two layers of perforated plates of the double-layer composite perforated plate sound absorption mechanism. The double-layer composite perforated plate sound absorption mechanism comprises a first perforated paperboard and a second perforated paperboard. The composite noise attenuation structure composed of the rubber plate and the multiple layers of insulating paper plates is arranged on the inner side wall of the oil tank, vibration waves transmitted from insulating oil are blocked and weakened through material combination of different media, vibration noise can be reduced, and the composite noise attenuation oil tank is an important measure for solving the problem of noise of an electric reactor.

This application discloses a novel noise reduction structure for a pressure cooker, comprising: a noise reduction seat with openings at both the top and bottom, and a noise reduction cover that can be opened and closed and is disposed above the noise reduction seat. The noise reduction seat and the noise reduction cover are fitted together to form a receiving cavity covering the pressure vent cap. The noise reduction cover has a vent hole, and the inner sidewall of the noise reduction cover protrudes towards the receiving cavity corresponding to the position of the vent cap, forming a reflux wall. This embodiment, through the enveloping receiving cavity formed by the noise reduction seat and the noise reduction cover, completely covers the pressure vent cap within a closed space, forming a physical barrier layer to directly weaken noise propagation. Simultaneously, the reflux wall forces steam to swirl downwards, reducing steam velocity and impact energy before it is discharged outwards through the vent hole. This dual effect attenuates high-frequency impact noise by over 40%, and the compact integrated structure avoids the volume defects of traditional screw-on devices.

The invention relates to an acoustic insulation panel (1) based on Helmholtz single-cavity resonators, designed to effectively attenuate low-frequency noise generated by industrial equipment. The panel (1) is formed by a front wall (2) and a rear wall (3), both U-shaped, enclosing a hollow space (4) that acts as a resonator cavity. The shorter sides (2', 3') of these walls are folded inwards, forming channels that function as inlets (5) to the resonator. Furthermore, an acoustic insulation system composed of several of these panels (1) is described, in which the panels are arranged so as to allow both ventilation and noise attenuation. The associated acoustic insulation method consists of facing the resonators to maximize noise absorption at specific frequencies, ensuring a laminar air flow that improves the efficiency of the system without the need for large volumes or additional silencers.

A method that includes determining a level of sound within an acoustic environment captured by a microphone; receiving, from a headset worn by a user, data indicating an audio processing mode in which the headset is operating; determining a level of attenuation of the sound based on the audio processing mode and the level of sound; estimating sound exposure based on at least the level of attenuation and the level of sound; and transmitting the sound exposure to an application program.

The invention belongs to the technical field of house decoration, and particularly relates to a sound insulation wall for house decoration, which comprises a wall body base layer, a sound insulation functional layer is fixedly connected to the surface of one side of the wall body base layer, and the side, deviating from the wall body base layer, of the sound insulation functional layer is covered with a decorative surface layer; the counterweight base is fixedly arranged on the side, away from the sound insulation functional layer, of the bottom of the wall base layer, a butt joint block is fixedly arranged on one side of the counterweight base, an inner cavity is formed in the other side of the counterweight base, and the inner cavity and the butt joint block are located at the same height position and matched with each other; and the butt joint positioning mechanism comprises a threaded rod, a movable block, a clamping arm and a transverse column, and the threaded rod is assembled in the inner cavity through a bearing. According to the invention, full-dimensional dead-corner-free noise reduction is realized, the noise attenuation amplitude can be greatly improved, the construction noise can be controlled within an environmental protection standard limit value, the interference to the surrounding environment is effectively reduced, and the environmental protection compliance of construction is improved.

The table top range hood comprises a machine body and a draught fan, the machine body is provided with a first flow guide cavity, a second flow guide cavity and a third flow guide cavity which are sequentially communicated, the first flow guide cavity, the second flow guide cavity and the third flow guide cavity are arranged in a U shape, and an inlet of the draught fan is communicated with the third flow guide cavity; oil smoke is suitable for sequentially flowing through the first flow guide cavity, the second flow guide cavity and the third flow guide cavity when the fan works. According to the technical scheme, the first flow guide cavity, the second flow guide cavity and the third flow guide cavity are designed to be arranged in a U shape to form the U-shaped flow channel, the U-shaped flow channel is provided with the corner part, the flowing direction of oil smoke needs to be changed for multiple times in the conveying process, the propagation path of noise is also changed, noise attenuation is achieved, and the noise reduction effect is improved. And therefore, the noise of the table top range hood can be reduced.

The utility model discloses an insulation noise reduction structure of an extra-high voltage oil-immersed shunt reactor, which comprises a plurality of layers of insulation partition plates, a cork rubber pad, a non-adhesive laminated wood fastener, a hot-pressed polyester resin plastic laminated board fastener and a lastrum laminated wood bracket, and the two adjacent layers of insulation partition plates are separated by the cork rubber pad. And the insulating partition plate is fixed on the box wall of the extra-high-voltage oil-immersed shunt reactor through the cork rubber pad, the non-adhesive laminated wood fastener, the hot-pressed polyester resin plastic laminated board fastener and the Lushi laminated wood bracket. The insulation noise reduction structure has enough mechanical strength and certain flexibility, integrates the advantages of reliable mechanical structure, reliable insulation, noise absorption and the like, and solves the problems of high ground potential field intensity and low noise attenuation in a high-voltage line end outgoing line area. The low-noise electric reactor has the advantages of being capable of improving the ground insulation strength of the high-voltage line end and absorbing and attenuating noise, and is suitable for the design of low-noise electric reactors with the grade of 750 kV to 1100 kV.

An acoustic panel for an aircraft providing noise attenuation over a wide frequency band by combining two resonators, and acoustic panel manufacturing method. The acoustic panel includes a rear skin, a cellular structure, an intermediate layer including perforations, a cellular structure, a cellular structure and a resistive skin including perforations. The acoustic panel combines quarter-wave resonators with Helmholtz resonators to provide noise attenuation over a wide frequency range.

This invention proposes a design method for a full-band compact hybrid EMI filter circuit based on current feedback. The method includes: constructing an electromagnetic interference test circuit to obtain the common-mode EMI spectrum required for attenuation by the PWM converter, and establishing a high-frequency equivalent circuit for the PWM converter; obtaining the optimal hybrid EMI filter topology based on the high-frequency equivalent models of active and passive EMI filter circuits and the noise attenuation characteristics of the hybrid EMI filter circuit topology; designing the active EMI filter topology and its high-frequency equivalent model based on the noise cancellation principle of the active EMI filter and the common-mode EMI spectrum; designing the active EMI filter topology based on the noise cancellation principle of the active EMI filter and the common-mode EMI spectrum; designing the passive EMI filter structure based on the common-mode EMI noise spectrum after adding the active EMI filter; and designing the hybrid EMI filter circuit based on the hybrid EMI filter topology, the active EMI filter topology, the passive EMI filter structure, and the high-frequency equivalent models of the active and passive EMI filter circuits.

The application relates to a noise analysis method, in particular to a noise reduction analysis method and system based on urban green land form. The method comprises the following steps: obtaining three-dimensional data of a target green land, and determining three-dimensional form data corresponding to the target green land according to the three-dimensional data, wherein the three-dimensional form data corresponding to the target green land comprises spatial geometric form of the target green land and vegetation three-dimensional form data corresponding to the target green land; constructing a sound propagation-vegetation attenuation coupling model based on the three-dimensional form data; the sound propagation-vegetation attenuation coupling model is used for predicting expected noise at a target position according to a noise source and three-dimensional form data of the target green land; and noise at the target position is predicted based on the sound propagation-vegetation attenuation coupling model, so as to realize high-precision noise attenuation result prediction according to the three-dimensional form of the urban green land, and provide reliable data support for maintenance or planning of the target green land.

A personal acoustic device with passive noise blocking or noise attenuation characteristics for use in high noise environments or for acoustic isolation from an external environment allowing for continuous sound blocking without any power or additional infrastructure. Passive systems have limited ways to fail versus active systems such as active noise cancellation with their complexity that can fail unexpectedly or are unavailable when power is absent. The device comprises an outer cup with an inner cup connected by one or more elements for at least one of locating, retaining and limiting motion of the inner cup with respect to the outer cup, wherein the inner cup fits over a user's car.

A tangible, non-transitory, machine-readable media, includes instructions configured to cause a processor to determine a residual associated with input seismic data received from a seismic source. The residual is indicative of a difference between expected input seismic data and the input seismic data, and wherein the input seismic data is configured to be combed with an expanded window such that the expanded window comprises data generated by an earlier seismic source excitation and received before a time of a seismic source excitation that generated an input seismic trace corresponding to the input seismic data. The instructions are also configured to cause the processor to determine a deblended output based at least in part on the residual. In addition, the instructions are configured to cause a processor to update the deblended output based at least in part on a result from performing one or more recovery operations configured to recover coherent signals from non-coherent signals of the deblended output. The coherent signals comprise a matching parameter. Further, the instructions are configured to cause a processor to filter the deblended output to remove a portion of the deblended output that is before the time of the seismic source excitation or before a predicted earliest arrival time of a seismic wave travelling from the seismic source to a receiver, to generate an improved deblended output comprising less noise than the deblended output. Still further, the instructions configured to cause a processor to transmit the filtered deblended output for use in generating a seismic image. The seismic image represents hydrocarbons in a subsurface region of Earth or subsurface drilling hazards.

The invention relates to the technical field of seismic dispersion surface wave attenuation, in particular to a seismic surface wave attenuation method. The seismic surface wave attenuation method comprises the following steps: firstly, establishing a surface gradient model according to surface elevation information after smoothing processing; secondly, according to the change relation between the earth surface gradient model and the surface wave dispersion, surface wave dispersion characteristics are counted; thirdly, establishing a frequency dispersion surface wave model according to surface wave frequency dispersion characteristics; then, matching the frequency dispersion surface wave model with actual seismic data to obtain surface wave information in the actual seismic data; and finally, separating the surface waves through a subtraction method on the basis of the surface wave information. According to the method, surface waves are effectively attenuated on the premise of ensuring that effective reflection is not lost, and the purpose of high-fidelity noise attenuation is achieved.

The invention relates to the technical field of polymer composite material synthesis, and discloses a noise-reduction skin material and a preparation method thereof.According to the noise-reduction skin material and the preparation method thereof, the multi-layer structure design of a surface layer, a sound absorption layer and a sound insulation layer is adopted, and the surface layer is subjected to electrolytic oxidation treatment to generate a porous oxidation film, so that sound wave scattering and interface impedance matching are enhanced; the gradient pores are formed in the sound absorption layer, so that wide-frequency-band noise can be effectively absorbed, and the noise reduction efficiency is improved; the sound insulation layer is formed by compounding nanoscale silicon dioxide aerogel and graphene and has the characteristics of high acoustic impedance and low density, the isolation effect of the material on high-frequency noise is further enhanced, and the noise attenuation rate of the material within the frequency range of 50-5000 Hz reaches 30 dB or above.

The invention relates to the field of silencers, and discloses an exhaust silencing system which comprises a first silencer, a second silencer and a third silencer which are sequentially connected in series. The first silencer comprises a first resonant cavity and a first filling cavity which are sequentially arranged in the airflow direction, and the first resonant cavity is configured to attenuate noise of a first target frequency band; the second silencer comprises a second resonant cavity and a second filling cavity, and the second resonant cavity is configured to attenuate noise of a second target frequency band; the third silencer comprises a resistant silencing cavity and a third filling cavity, and the resistant silencing cavity is configured to attenuate noise of a third target frequency band; the first filling cavity, the second filling cavity and the third filling cavity are filled with sound absorption materials, and any two of the first target frequency band, the second target frequency band and the third target frequency band at least comprise different frequency ranges. According to the exhaust and noise elimination system, the exhaust and noise elimination system is connected in series in structure and complementary in acoustic function, and a full-band coverage noise attenuation path with complementary frequency bands is jointly formed.

A cooling fan assembly for a nuclear imaging system is provided, wherein the fan assembly may include: a fan; an air inlet opening; an air outlet opening; and a honeycomb structured sheet mounted across the air inlet opening whereby when the fan is in operation and air flows through the air inlet opening, the honeycomb structured sheet promotes laminar flow of air at the air inlet opening and attenuates acoustic noise generated by the fan.

This disclosure relates to the field of petroleum geophysical exploration technology, and particularly to a method, apparatus, device, and medium for strong stacking noise attenuation analysis. The method includes: dividing the original pre-stack seismic data into time windows to obtain target time windows; statistically analyzing the amplitude energy characteristics, velocity characteristics, and frequency characteristics corresponding to the original pre-stack seismic data in each target time window; constructing a dynamic feature matrix based on the amplitude energy characteristics, velocity characteristics, and frequency characteristics; fitting the feature data in the dynamic feature matrix to obtain a stacked noise model; adaptively attenuating the stacked noise model using the original pre-stack seismic data; when the denoised signal does not meet the denoising standard, returning to the step of dividing the original pre-stack seismic data into time windows to obtain target time windows, until the denoised signal meets the denoising standard; and outputting the denoised signal when the denoised signal meets the denoising standard. This invention can improve the accuracy of strong stacking noise attenuation.

The application discloses a wind-fish integration layout optimization method and device considering offshore wind power underwater noise, equipment and storage medium, relates to the seawater culture engineering technical field, and comprises the following steps: based on the linear relationship between wind speed and noise source sound source level and the noise attenuation model with underwater distance, an underwater noise propagation model of a wind turbine generator unit is established; based on the wake effect of the wind turbine generator unit, a power generation calculation model of a wind farm is established; based on a target function with the purpose of maximizing total power generation, a wind turbine generator unit spacing constraint and a noise limit constraint of a culture area, an optimization model is constructed; the wind turbine generator unit coordinates and the culture net cage coordinates are taken as inputs of the optimization model, the optimization model is solved, and the optimized layout positions of the wind turbine generator unit and the culture area are obtained, so that the single economic perspective of only considering power generation efficiency in traditional wind farm planning is broken through, the underwater noise pollution is taken as a core constraint and integrated into the layout optimization, and therefore, the contradiction between marine energy and resources is reduced.

The preparation method of the automobile cotton felt sound insulation pad with the multi-layer composite structure comprises the following steps: step 1, surface layer raw material pretreatment: 35-40 parts of polyester chips, 4-7 parts of nano silicon dioxide and 3-5 parts of a flame retardant are uniformly mixed, and modified polyester staple fibers are prepared through melt spinning, drafting and cutting, the fiber length is 38-51 mm, and the linear density is 1.5-3.0 dtex; the sound insulation and noise reduction effects are remarkable, broadband noise is covered, the middle layer is of a sound absorption cotton and sound insulation film composite structure, glass fiber / basalt fiber sound absorption cotton can efficiently absorb medium-high frequency noise (such as tire noise and wind noise), and the EVA and TPU sound insulation film can block low frequency noise. The polyurethane foaming cotton of the buffer transition layer further weakens sound wave conduction, and full-band noise attenuation is achieved in cooperation with the damping effect of the modified polyester acupuncture cotton on the surface layer.

The invention relates to a noise analysis method, in particular to a noise reduction analysis method and system based on urban green land morphology, and the method comprises the steps: obtaining the three-dimensional data of a target green land, and determining the three-dimensional morphology data corresponding to the target green land according to the three-dimensional data, the three-dimensional shape data corresponding to the target green land comprises a spatial geometric shape of the target green land and vegetation three-dimensional shape data corresponding to the target green land; constructing an acoustic propagation-vegetation attenuation coupling model based on the three-dimensional form data; the sound propagation-vegetation attenuation coupling model is used for predicting expected noise of a target position according to a noise source and the three-dimensional form data of the target green land; and performing noise prediction on the target position based on the sound propagation-vegetation attenuation coupling model, thereby realizing high-precision noise attenuation result prediction according to the three-dimensional form of the urban green land, and providing reliable data support for maintenance or planning of the target green land.

This application discloses an electrical device and an energy storage system. The electrical device includes at least one first electrical module, a silencing duct, and a fan. The first electrical module has a first accommodating cavity, a first duct, and a second duct. The first duct is located on at least one of the two ends of the first accommodating cavity in a first direction, and both extend along a second direction. The second duct extends along the first direction and communicates with the first duct. The first vent of the silencing duct communicates with the second duct, and the second vent of the silencing duct communicates with the external environment. The second vent is located away from the first vent within the silencing duct. The fan is located at the first vent. Fan noise needs to propagate outward through the silencing duct or the first and second ducts, effectively extending the sound wave transmission path and increasing the number of sound wave reflections, thus achieving noise attenuation and ultimately reducing the noise of the air-cooled heat dissipation system of the electrical device.

The utility model discloses a capacitor noise test box which comprises a box body, a box door hinged to the side wall of the box body, an adjusting assembly arranged at the top of an inner cavity of the box body, a sound receiver arranged at the top of the inner cavity of the box body, and a plurality of vibration reduction assemblies arranged at the bottom of the box body. A motor is turned on to drive a rotating shaft to rotate, so that a winding roller drives a pull rope to wind, then the position of a moving seat is adjusted, noise attenuation data of the capacitor changing along with the distance is conveniently tested, an electric push rod is turned on to drive a connecting plate to move, a clamping block moves to clamp a gear, locking is facilitated, and the capacitor is prevented from sliding down; the box body drives the supporting block to vibrate, buffering and vibration reduction are facilitated through the vibration reduction assembly, and the influence of a sound source caused by external environment vibration on a noise test result is conveniently reduced.

The application relates to the technical field of audio processing, and discloses a sound recognition method and system based on a neural network, which comprises the following steps: firstly, obtaining a target scene real-time audio stream, extracting a time-frequency feature group, analyzing a pulse code sequence, and constructing a sound network architecture; then, recognizing acoustic feature clusters by using the sound network architecture, matching a preset framework hierarchical topological relationship, optimizing node weights to generate an adaptive mapping network; based on the adaptive mapping network, analyzing a sound source propagation path, recognizing a multipath effect factor, calculating a frequency domain coupling coefficient, and hierarchically fusing to obtain a hybrid feature tensor; querying a tensor adaptive response track, extracting a phase distortion feature and a signal-to-noise ratio index, and calculating a signal-to-noise attenuation entropy; finally, judging a robust recognition level according to the signal-to-noise attenuation entropy, reconstructing a sound source collection dimension, and formulating a sound recognition scheme. The application can improve the sound recognition precision in a complex environment.

The invention discloses a system and a method for measuring a noise source in a complex three-dimensional environment, and relates to the technical field of data processing, and the number of required equipment is obtained through analysis according to horizontal projection area data of an environment to be measured and effective detection radius and detection angle threshold parameters in the horizontal direction of noise source measuring equipment. And horizontal coordinates of the equipment are obtained through GPS positioning, a coverage area geometric model is established in combination with detection parameters, an overlapping area is obtained through intersection operation, a geometric center is analyzed, and noise attenuation calibration equipment is arranged to provide a unified calibration reference. A calibration device emits a standard sound signal, a target measurement device calculates an actually measured signal-to-noise ratio through signal processing, the actually measured signal-to-noise ratio is compared with a theoretical signal-to-noise ratio to obtain an attenuation value, and accordingly, the center frequency of a filter circuit is adjusted, the gain of an amplification circuit is corrected, and an analog-to-digital conversion threshold value is set. The calibration interval is determined through trend extrapolation prediction calibration, the deviation caused by equipment aging and thermal noise is dynamically corrected, and the measurement precision is continuously guaranteed.

The utility model discloses a shock absorption and sound absorption cotton structure for an automobile, and relates to the technical field of shock absorption and sound absorption cotton, the shock absorption and sound absorption cotton structure comprises an outer top plate, an inner sound absorption mechanism is fixedly connected below the outer top plate, and a plurality of groups of fixed rotating seats are fixedly connected above the inner sound absorption mechanism; through the telescopic synergistic effect of the multiple sets of damping rods and the supporting springs, directional attenuation is conducted on vibration energy perpendicular to the outer top plate, and energy dispersion caused by multi-degree-of-freedom vibration is avoided; a double-side rotating seat, a first damping rod and a second damping rod are matched, a multi-stage dissipation path of vibration energy in the vertical direction is formed, the damping efficiency is remarkably improved, the vibration energy enters the sound absorption cotton layer in a directional mode through the hard dense-hole bottom plate, and high-frequency noise attenuation is achieved; the high-density sponge layer absorbs low and medium frequency sound waves through pore resonance, the aluminum foil layer forms a sound and heat isolation barrier through the dual functions of sound reflection and heat radiation blocking, and finally the integrity of a sound wave gradient attenuation path is guaranteed through supporting of the rubber supporting columns.

The present application relates to the technical field of path planning, in particular to a multi-unmanned aerial vehicle low-noise path planning method and system, comprising: modeling the flight environment of the unmanned aerial vehicle; establishing a sound source directivity model of the unmanned aerial vehicle, and evaluating the noise influence of the unmanned aerial vehicle flight on a noise-sensitive area according to a noise attenuation formula; utilizing an acoustic-driven artificial potential field algorithm to perform path planning, generating a flight path of the unmanned aerial vehicle by calculating an attractive potential field, a repulsive potential field and the interaction force between the unmanned aerial vehicles, and updating the path planning in real time. The present application converts noise characteristics into a repulsive force mechanism, combines noise characteristics with an artificial potential field, simplifies the noise evaluation process, not only realizes rapid and real-time path planning, but also dynamically avoids noise-sensitive areas when planning a path, greatly reducing the influence on noise-sensitive areas.

The invention discloses a spatially selective active noise control method and system for a fan-shaped region, and the method comprises the steps: a signal collection and acoustic modeling module builds an acoustic propagation model of a target and non-target fan-shaped region, and carries out the processing of a collected signal, and obtains a frequency domain spectrum; the spatial acoustic feature extraction module is used for extracting phase difference features, energy level difference features and logarithmic power spectrum features; the deep learning modeling module is used for processing different types of acoustic features and generating a frequency domain mask after feature fusion and time sequence modeling; the secondary acoustic compensation module introduces a loudspeaker nonlinear simulation function and performs forward compensation in combination with a secondary path acoustic response; and the dual-target optimization module is used for realizing end-to-end network training by a weighted loss function through jointly optimizing target fan-shaped signal distortion and non-target fan-shaped noise attenuation. According to the method, the region selectivity of noise control is improved, the target signal quality is ensured, and meanwhile, the suppression capability on the noise in the non-target direction is remarkably enhanced.

The present invention discloses systems and methods for attenuation of coherent environmental and source-generated noise in a continuously recorded domain of seismic survey testing. Rather than applying universal de-noising techniques to conventional gathers after source de-blending, the system and methods discussed herein focus on estimating and removing noise directly on continuous records by leveraging the noise characteristics in the domain of natural recording. Such techniques may equally be applied to coherent environmental and source-generated noises on seismic data as well as other data and noise types. Driven by the noise types encountered in the field, the methods of noise attenuation may be based upon time-frequency domain rank reduction techniques. Further, to model signal and / or noise, low-rank approximations are employed in conjunction with other techniques such as operator design and unsupervised learning.

The present invention relates to an automotive sound attenuating trim component having both sound-insulating and sound-absorbing properties. The trim component has mass spring characteristics and thus includes a spring layer and a mass layer. The mass layer is composed of a barrier layer and a porous fiber layer adjacent to each other and is laminated with the barrier layer located between the spring layer and the porous fiber layer, the radiation frequency of the mass layer is at least 3 kHz, and the average sound absorption value is at least 0.40.