51 results about "Sound energy" patented technology

The utility model discloses a kind of transcranial ultrasound stimulation devices, it is related to medical instrument and ultrasonic treatment technical field, comprising: ultrasonic transducer;Tightening assembly, it is set to the bottom outside of ultrasonic transducer, and the quick disassembly and installation of ultrasonic transducer are realized by tightening assembly;Ultrasonic coupling assembly, it is set to the bottom of tightening assembly and is matched with ultrasonic transducer, and by ultrasonic coupling assembly, air gap when fitting is reduced to reduce sound energy loss.The utility model is matched by ultrasonic transducer, tightening assembly and ultrasonic coupling assembly, not only can realize accurate ultrasonic wave conduction, can also adapt to complex head shape, especially at complex target point such as binaural area, the flexible characteristic of its soft bag guarantees close fitting with head tissue, so that it can provide consistent sound wave conduction, avoid the interference of air or other material, significantly improve the effect of treatment.

This invention discloses a reconstituted bamboo sound barrier and its manufacturing method, relating to the field of sound barrier technology. Specifically, it is a reconstituted bamboo sound barrier comprising spaced, inclined columns, with standard modular screen bodies fixed between the columns by clamping angle steel. The screen body uses a reconstituted bamboo main screen body as the core sound-absorbing body, combined with reconstituted bamboo panels, reconstituted bamboo cavities, reinforcing frames, and other components. The reconstituted bamboo panels have 0.3mm-1.0mm micro-perforations, forming an auxiliary sound-absorbing structure with the sealed reconstituted bamboo cavities, enhancing the sound absorption effect of the reconstituted bamboo main screen body. The diffusion texture of the reconstituted bamboo main screen body disperses reflected sound waves, improving the uniformity of the sound field, allowing more sound energy to "penetrate" into the sound-absorbing material and be consumed. The manufacturing process involves bamboo bundle pretreatment, shaping, and assembly, resulting in a product with low cost, light weight, good durability, environmental friendliness, and excellent acoustic performance, suitable for noise control on highways, railways, and other road sections.

The utility model discloses a kind of surface sound source auxiliary sound systems, including frame, vibrating sound board, driver, sound insulation board and backboard being set to the rear side of the frame;The driver is set on the vibrating sound board, the vibrating sound board and the sound insulation board are set in the frame, the sound insulation board is set between the vibrating sound board and the backboard;First shock absorber is arranged between the vibrating sound board and the frame, second shock absorber is arranged between the sound insulation board and the frame.The surface sound source auxiliary sound system of the utility model passes through reasonable structural design, effectively blocks and absorbs the sound diffused to back, reduces the waste of sound energy, improves the propagation efficiency and directivity of sound, improves tone quality and sound propagation effect.

The application provides an aircraft environmental control pipeline air outlet with uniform air outlet and excellent noise reduction performance, relates to the field of aviation pipelines, and solves the problems of concentrated air outlet and large noise at the air outlet of an aircraft environmental control pipeline system. The air outlet comprises a perforated shell, a guide flow distribution plate and a main body shell, the perforated shell is fixed in the main body shell, and a perforated sound absorption medium layer is clamped and fixed between the perforated shell and the inner wall of the main body shell; sound holes are uniformly arranged on the shell wall of the perforated shell, the perforated shell comprises an air outlet plate, the air outlet plate is uniformly provided with air outlet holes, and the air outlet plate is fixed at the air outlet of the main body shell; the guide flow distribution plate is fixed in the perforated shell and is used for distributing and guiding airflow to the air outlet plate. Sound waves produce viscous friction in the sound holes, the perforated sound absorption medium layer efficiently dissipates sound energy through internal friction and heat conduction, the air outlet plate enables airflow to be uniformly discharged from the air outlet, and the above structure can improve the uniformity of the air outlet flow and the sound absorption and noise reduction performance.

The application discloses a movable membrane-shaped metamaterial sound barrier, which comprises a thin film noise reduction unit and a structure fixing unit for arranging and fixing the thin film noise reduction unit, wherein the thin film noise reduction unit comprises a microporous membrane, a first cavity, a first sound insulation layer, a second cavity and a second sound insulation layer arranged along the sound wave propagation direction, and the microporous membrane is provided with a plurality of micropores for absorbing sound waves; when sound waves enter the first cavity through the microporous membrane, the micropores and the first cavity are used for preliminary noise reduction to reduce reflected sound generated by the sound waves; the sound energy of the transmitted sound waves is reduced through the first sound insulation layer and the second sound insulation layer; and the sound energy of the transmitted sound waves is further reduced through the second cavity. The application further provides an installation method. The sound barrier provided by the application is convenient to disassemble and assemble and has the effects of sound insulation and sound absorption, so that the noise pollution of construction equipment in a construction site can be effectively reduced.

This invention relates to the field of bearings, specifically to a noise-reducing bearing with an integrated micro-perforated plate sound-absorbing structure. Rolling elements are disposed between the inner and outer rings of the bearing, and these rolling elements are positioned at intervals by a cage. A sealing ring is disposed on one side of the outer ring. The sealing ring has a mounting structure for installing the micro-perforated plate. The micro-perforated plate is annular and installed at the sealing ring, with a uniform array of micropores. An air cavity is formed between the micro-perforated plate and the sealing ring, constituting the back cavity of the sound-absorbing structure. In this invention, by setting a micro-perforated plate sound-absorbing structure at the bearing's sealing structure, the bearing maintains its original sealing function while possessing active sound absorption capability. When noise generated during bearing operation propagates to the micro-perforated plate, sound waves enter the micropores, generating viscous friction and heat exchange between the air and the pore walls within the micropore channels, thereby converting some of the sound energy into heat energy and dissipating it.

The utility model discloses a movable container generator room noise reduction silencer, related to container technology field, including the box, the box one side is equipped with the air inlet and the air outlet, the air inlet and the air outlet are located the both ends of box respectively, be provided with two groups of ventilation pipeline on the box inner wall, two groups ventilation pipeline end part are arranged respectively in the air inlet and the air outlet's cavity mouth department, the ventilation pipeline includes the inner tube and the outer tube of fixed cover set in the outer side of inner tube, this movable container generator room noise reduction silencer, set up vacuum area around ventilation pipeline to this block part sound wave propagation medium and realize the noise reduction, at the same time, set up the S shape ventilation cavity of sound insulation baffle group, utilize the curved path extension sound wave propagation distance, increase the reflection number to improve the absorption efficiency of sound energy of sound absorption material to the noise, therefore reduce the noise of air outlet or air inlet, reach the effect of improving movable container generator room noise reduction silencer.

The utility model belongs to door and window technical field provides heat -proof aluminium alloy multi -cavity structure window, include: frame body, the frame body is hollow structure, the frame body inside fixed mounting has glass, the glass is multilayer hollow structure, the frame body inside is provided with a plurality of cavity, the cavity constitutes square matrix structure, the cavity inside inserts sealed equal pressure adhesive tape, the sealed equal pressure adhesive tape inside inserts has soundproofing cotton, the cavity inside inserts heat -proof strip, the heat -proof strip sets up between sealed equal pressure adhesive tape, the cavity edge is provided with isotherm, the utility model discloses frame body inside provided with a plurality of cavity constitutes multi -cavity square matrix structure, and this structure can effectively disperse and absorb sound energy, when the outside noise is transmitted into the door and window, the sound will be constantly reflected, refracted and attenuated between multiple cavities, greatly reduce the propagation intensity of sound, compared with traditional single -cavity or simple structure's door and window, and multi -cavity structure can block the incoming noise more effectively.

The utility model discloses a tooth chair headrest that can alleviate stimulation relates to medical equipment technical field, including headrest, the headrest one side of installation on the dental chair is equipped with the controller, and the controller also is installed on the dental chair, the headrest includes the pillow core, and the pillow core outside sleeve has the pillowcase, and the pillowcase lower extreme is located bottom shell inside and is fixedly connected with bottom shell inner wall, and the pillowcase top portion both ends symmetry is equipped with two baffle, and two baffle inside one end all are installed with directional loudspeaker, and two baffles all are equipped with the sound insulation layer in, after the patient head extrusion pillow core, and the pressure sensor in the pillow core passes on the signal to the controller, and the controller can control two directional loudspeaker and play the preset audio that can alleviate nervous mood, thereby reduces the patient anxiety, the psychology of fear, reduces the doctor's work difficulty, in addition, two directional loudspeaker can gather the sound energy in the ear nearby of patient, improves the pacification effect to patient, also can avoid the sound that plays influences the normal operation of doctor.

The application discloses a rail transit wall-attached sound-absorbing layer structure and a design method thereof. The sound-absorbing layer structure is composed of three layers of curlable sound-absorbing materials, and is respectively a noise capturing layer, an acoustic corridor layer and a low-frequency suppression layer along the radial direction of a tunnel. A plurality of regular hexagonal micro-porous channel units are arranged in an array on the noise capturing layer. The acoustic corridor layer is provided with staggered cavity corridor structures in an array, so that sound waves are reflected multiple times to convert sound energy into internal energy. The low-frequency suppression layer is provided with arrayed mass concentration units. Due to the difference in density between the arrayed mass concentration units and the film, the vibration of the system composed of the arrayed mass concentration units and the film is opposite, so that the sound-absorbing performance of the whole material is improved. According to the psychoacoustic annoyance degree, the sound-absorbing layer structure can be optimized, so that the design of the sound-absorbing layer structure meets the comfort of drivers and passengers during train driving, prevents work errors of train staff due to hearing insensitivity, and guarantees safe operation of the train.

The utility model discloses a fireproof door with sound insulation function, including door frame and fireproof door body, the inside one end of door frame is hinged in one end of fireproof door body, and the inside one end of door frame is installed with baffle, and one side of baffle is installed with sealing strip, and the steel material is used to fireproof door body and baffle, and the fireproof door body is rotated, so that fireproof door body is fitted in the baffle installed in the inside one end of door frame, and the sealing strip installed on one side of baffle is extruded to fireproof door body, and the sound insulation soft board installed on the bottom of fireproof door body is fitted on the ground and moves to the bottom of door frame, and the gap between door frame and fireproof door body is sealed, effectively insulating noise, and the rock wool layer and glass wool layer filled in the inside one end of fireproof door body have good fireproof performance and can withstand the invasion of high temperature flame, when the sound is transmitted into these materials, the sound wave will continuously reflect and refract in the pore, so that the sound energy is converted into heat energy and is consumed, and the sound absorption effect is achieved.

This application provides an audio speaker, relating to the field of acoustic equipment technology. The speaker includes: a cabinet; a loudspeaker connected to the cabinet; a partition disposed inside the cabinet, dividing the space within the cabinet into a main cavity and a secondary cavity, with the loudspeaker opposite the main cavity; multiple passive radiators, each disposed on an opposing surface of the cabinet and the partition; a linkage connecting the multiple passive radiators, used to actuate the multiple passive radiators; and a perforated component disposed within at least one of the main cavity and the secondary cavity. This speaker can reduce the resonant frequency of the acoustic system, while absorbing standing waves and excess reflected sound energy, reducing acoustic interference and nonlinear distortion, and preventing noticeable bass trailing and muddiness.

The application discloses a modular acoustic black hole energy dissipation unit for a tunnel and a system and a maintenance method thereof. The energy dissipation unit comprises at least one of a wall-mounted unit and a trackside clamping unit; the wall-mounted unit comprises an ABH thinning area with a power-law function thickness distribution and a first damping layer covering a residual thickness area in an energy gathering center of the ABH thinning area; and the trackside clamping unit comprises a clamp assembly, an ABH plate with a power-law function thickness distribution and a second damping layer laid on an energy gathering area of the ABH plate. The application dissipates reverberation sound energy through the wall-mounted unit, suppresses rail vibration through the trackside clamping unit, and realizes sound field-vibration source cooperative control; the clamp contact surface of the trackside clamping unit is subjected to hardening treatment or a friction-enhancing coating, cooperates with high-reliability fasteners and a secondary safety structure, and improves long-term service reliability; and state-based predictive maintenance is realized in combination with intelligent bolts. The application is suitable for modular installation, quick replacement and intelligent operation and maintenance in a tunnel.

The application discloses a kind of based on porous material's double-side phase gradient composite sound absorption metasurface structure and design method, it is related to acoustic metamaterial and sound absorption metasurface technical field, structure includes: rigid metal frame and multiple periodic arrangement sound absorption metasurface subunit, each subunit is divided into acoustically isolated first, second functional area along the thickness direction, respectively control transmission, reflection sound wave phase, functional area is equipped with rigid baffle and the sound channel of porous sound absorption material in it. By differentiating design subunit parameter, make it form 0~2π phase distribution at target frequency, form phase gradient on both sides, in combination with the period design of λ / d>2, convert high-order diffraction wave into surface wave, cooperate porous material to realize sound energy efficient dissipation.The total thickness of the application is less than 1 / 8 of target wavelength, predetermined frequency band sound absorption coefficient α≥0.8, the performance is stable from-50° to +50° incident angle, adapts to a variety of porous materials and target frequency, widely used in noise control scene.

The present application relates to internal combustion engine, specifically provide a kind of muffler for aviation internal combustion engine and aviation internal combustion engine, to solve the problem that the exhaust muffler of existing internal combustion engine is too large in size and too heavy in weight, not suitable for the needs of low-altitude aircraft.For this purpose, the muffler of the present application includes air inlet, air outlet and multiple layers of pleated partition, air inlet and air outlet form airflow passage, multiple layers of pleated partition are arranged in airflow passage in spaced-apart, each layer of pleated partition is configured to scatter, reflect, refract and diffract the sound waves of airflow, multiple layers of pleated partition are configured to continuously reflect and refract sound waves in multiple stages, so that sound waves collide with each other to cancel sound energy and reduce sound intensity, so that sound energy concentrated sound waves are scattered and attenuated step by step when passing through multiple layers of pleated partition, so that the muffler of the present application has obvious noise reduction effect, and the muffler of the present application is made of metal 3D printing, so that the effect of small size and light weight can be realized.

This invention discloses a sound-absorbing and flame-retardant multilayer woven fabric, its preparation method, and its application in interior decorative fabrics, relating to the field of functional textile materials technology. The multilayer woven fabric comprises a surface layer, a middle layer, and an inner layer, which are integrally connected via a bottom-to-top joint. The surface layer employs a honeycomb weave based on a twill weave, characterized by a regular, convex-concave cell structure. The middle and inner layers employ a plain weave. The interlayer joints between the surface, middle, and inner layers are periodically distributed along the warp or weft direction. Each period includes several consecutive non-jointed areas with no joints and at least one joined area with a joint, forming a periodic strip-shaped hollow layer between the three layers. Through the synergistic design of the honeycomb surface structure, the multilayer porous weave structure, and the periodic hollow layer structure, the multilayer woven fabric of this invention creates multi-level sound energy dissipation paths within the fabric, thereby improving the overall sound absorption performance of the fabric.

The application relates to the field of intelligent traffic and public safety, and particularly discloses an emergency sound range coverage strategy optimization method and system. The method comprises the following steps: constructing a dynamic three-dimensional acoustic attention domain for a moving target in real time according to a video event and geographic information; based on the attention domain, calculating parameters for driving multiple sound columns to work cooperatively through a beam forming algorithm, so as to focus sound waves in a target area and suppress sound energy in a non-target area; collecting real sound field data for comparison and feedback, and online calibrating driving parameters to ensure coverage effect; when multiple events occur simultaneously, generating a global scheduling strategy through priority evaluation and conflict arbitration, and orderly allocating sound column resources; the system comprises four functionally corresponding modules. The application realizes accurate acoustic tracking and adaptive coverage of a moving target, effectively solves the problems of poor broadcast effect and resource conflict in multiple events in a complex environment, and significantly improves the intelligent level and intervention efficiency of an emergency broadcast system.

This invention proposes a dynamic baffle speaker enclosure for enhancing sound energy, comprising a speaker unit, a speaker mounting plate, a speaker enclosure frame, a dynamic baffle, a suspension system, and a mechanical coupling component. The speaker unit includes a cone, a frame, and a magnetic circuit. The speaker mounting plate has sound-permeable holes, and the speaker unit's frame is fixedly mounted on the mounting plate. The speaker enclosure frame supports the speaker mounting plate. The dynamic baffle is located in front of the speaker unit. The suspension system connects the dynamic baffle to the speaker enclosure frame, allowing the dynamic baffle to vibrate and shift relative to the speaker enclosure frame. The mechanical coupling component connects the edge of the speaker unit's cone to the center area of ​​the dynamic baffle, transmitting the cone's vibration to the dynamic baffle. This invention directly transmits speaker vibration to the dynamic baffle through the mechanical coupling component, combined with the elastic support of the suspension system, significantly enhancing low-frequency sound wave radiation efficiency and solving the problems of insufficient low-frequency energy and poor transient response in traditional speakers.

The utility model belongs to the technical field of sound energy conversion discloses a kind of sounding device and electronic equipment, sounding device includes shell, magnetic circuit system and vibration system, magnetic circuit system is connected in shell, and magnetic circuit system is equipped with magnetic gap;Vibration system includes diaphragm and the voice coil for driving diaphragm vibration, and diaphragm includes ring folding part, the sealing structure connected in shell and the vibration plate connected in ring folding part;Sealing structure is arranged around ring folding part;Sealing structure includes the abutting portion and the first connecting portion of connection, the included angle between the inside surface of abutting portion and the virtual line extending along second direction is first included angle, the included angle between the outside surface of abutting portion and the virtual line extending along second direction is second included angle, and first included angle is less than second included angle;First connecting portion is connected in ring folding part, and second direction is perpendicular to the axial direction of sealing structure.The utility model has preferable acoustics performance.

The application is a kind of coal mine spontaneous combustion multi-parameter monitoring system and method, relating to the technical field of coal mine safety monitoring, comprising: gas sound coupling and hardware isolation module; low frequency band sound wave excitation module; acoustic echo receiving and front end conditioning module; TDR pure logic ranging and fault qualitative module. In the application, a special integrated forged tee cavity is used in combination with a high molecular sound-transparent isolation film structure, which not only realizes the physical isolation of flammable and explosive gases such as gas, toxic and harmful gases in the pipeline, but also ensures that the sound transmission rate and sound energy loss meet the preset requirements, meeting the stringent requirements of intrinsic safety and explosion prevention in coal mine underground, eliminating safety hazards caused by gas leakage, and not affecting the normal coupling transmission of sound waves.

The application discloses a kind of collaborative noise reduction control methods of distributed air conditioner cluster, it is applied to by collaborative control center and multiple air conditioning units consisting of cluster.Collaborative control center is through data convergence module and parallel acquisition the noise sound pressure level of each unit at the same time, fan speed, compressor frequency and operating state information;Establish space sound field model and calculate the contribution degree weight of unit's average sound energy contribution to the region of interest;With the lowest total noise sound pressure level of cluster as target to build global optimization model, constraint conditions include fan speed, compressor frequency, noise reduction ability and cluster total energy consumption;Solve to obtain the fan speed of each unit, compressor frequency and noise reduction sound wave parameter target value by heuristic optimization algorithm, as collaborative control instruction is issued to execute.The application is dynamically regulated and controlled by global collaborative optimization and model predictive control, avoids the noise superposition effect caused by single machine independent noise reduction, improves the real-time performance and accuracy of multi-parameter collaborative control.

This application discloses a thermally broken aluminum alloy casement window, belonging to the field of doors and windows. It includes an outer frame, an inner frame installed inside the outer frame via a thermally broken strip, a side frame mounted on the inner wall of the inner frame via two hinges, a sash frame fixedly installed on one side of the side frame, and a glass assembly installed inside the sash frame. Both the inner frame and the sash frame are equipped with Helmholtz resonators. The sound insulation layer filled inside the sash frame effectively isolates external noise and reduces the impact of internal noise. At the same time, some sound energy can be absorbed by the outer tempered glass and the intermediate PVB film, while the air layer of the inner double-glazed glass can further block the transmission of sound waves. Furthermore, the Helmholtz resonator can be used to specifically absorb noise of a certain frequency.

This utility model discloses a sound-absorbing and noise-reducing foam, relating to the field of foam technology. The utility model includes a cushioning sponge, with an upper foam fixedly connected to the bottom of the cushioning sponge, and a lower foam disposed at the bottom of the upper foam. This utility model forms a dynamic sound-absorbing structure through the synergistic effect of the horizontal and vertical sound-absorbing cotton and the micro-springs in the noise-reducing component. When sound waves enter the foam, the horizontal and vertical sound-absorbing cotton absorb high-frequency noise through their porous structure, while the micro-springs vibrate under the action of sound waves, converting sound energy into mechanical energy and further dissipating it, effectively enhancing the absorption of low-frequency noise. Simultaneously, the composite component adopts a three-layer composite structure of a sound-absorbing layer, a transition layer, and a damping layer. By matching the acoustic impedance of different materials, the transmission loss of sound waves between different media is optimized, thereby broadening the sound absorption band and making the overall sound absorption and noise reduction performance more balanced.

The utility model provides a kind of ultrasonic sensor, second matching layer is integrated with piezoelectric ceramic in the accommodating space of first matching layer, form integrated packaging structure, i. e. first matching layer is used as the shell of ultrasonic sensor, also as matching layer, eliminate the acoustic wave reflection interface between the shell of traditional ultrasonic sensor and matching layer, make sound energy transmission efficiency significantly improve;At the same time, the inner wall of accommodating space and second matching layer directly abut, reduce the acoustic impedance mismatch problem between multilayer medium, reduce liquid-sensor interface echo loss, improve the signal-to-noise ratio of flow detection signal;Use 0-3 type composite piezoelectric ceramic, the composite structure of its polymer matrix and piezoelectric ceramic particle can widen sensor operating bandwidth, have lower QM value and faster response rate, eliminate the pulse broadening problem caused by the QM value of traditional PZT piezoelectric ceramic in liquid medium is too high, further improve detection precision.

This invention relates to the field of coating technology, specifically to a sound-insulating and heat-insulating dual-effect curtain fabric coating and its preparation method, comprising the following raw materials in parts by weight: 50-60 parts epoxy resin, 18-20 parts curing agent, 4-6 parts diluent, 28-32 parts filler, 0.8-1.2 parts antioxidant, and 2-4 parts flame retardant. In this invention, the bamboo chopsticks in the filler are treated to form a porous structure, enabling sound waves to undergo multiple reflections and refractions within the pores, converting sound energy into heat energy for dissipation. The combination of powder and additives enhances the surface properties of the powder and strengthens its adhesion to the matrix. The hollow glass microspheres in the filler can combine with the resin matrix, locally resonating and scattering sound wave energy. The presence of additives ensures moderate and uniform bonding strength between the filler and the matrix interface, guaranteeing sound wave reflection and scattering at the interface. These synergistic effects improve the sound insulation performance of the coating.

This invention relates to the field of ventilation therapy equipment and discloses a ventilation therapy equipment and its noise reduction device. The noise reduction device includes a housing (1) with an airflow channel inside the housing (1) for transmitting airflow within the housing (1). A sound-absorbing component is disposed outside the airflow channel, the sound-absorbing component comprising a sound-absorbing material, and the sound-absorbing component is configured to be mutually isolated from the airflow within the housing (1). This noise reduction device allows noise waves inside the housing to have their sound energy absorbed by the sound-absorbing material of the sound-absorbing component when propagating through the sound-absorbing component outside the airflow channel, thereby effectively reducing the generation and transmission of noise. Since the sound-absorbing component is configured to be mutually isolated from the airflow within the housing, it can largely prevent particles that may exist in the sound-absorbing component from contacting the airflow within the housing, thereby reducing the risk of these particles being supplied to the patient with the airflow and ensuring the patient's ventilation safety.

This utility model provides a hollow, one-time injection-molded composite fencing, relating to the field of fencing technology. It includes a fencing body and two sound-absorbing components, both fixedly installed on the exterior of the fencing body, for quickly absorbing noise generated during construction. In this utility model, when noise contacts the surface sound-absorbing panel, some sound waves are directly absorbed and reflected, achieving initial attenuation. The remaining sound waves enter the cavity through the sound inlet holes and undergo multiple reflections under the action of a specially designed corrugated plate, significantly extending the propagation path and converting most of the sound energy into heat energy. Finally, the residual sound waves are completely absorbed by the sound-absorbing cotton and the inner wall sound-absorbing panel, achieving noise reduction across the entire frequency band. The structure adopts a multi-layer composite noise reduction design, achieving efficient sound energy absorption through a stepped noise reduction mechanism. This not only effectively reduces noise pollution and harms residents' health but also significantly improves the traffic environment and reduces the risk of accidents caused by noise interference for drivers.

This invention provides a thermoacoustic power generation system that uses a simple structure to control pressure and prevent damage to a linear generator due to abnormal pressure increases. The thermoacoustic power generation system includes: a linear generator with a piston and a housing; the piston vibrates back and forth within the cylinder to convert sound energy into electrical energy; the housing houses a coil and a permanent magnet; an annular tube connected to the linear generator via a resonant tube; and a prime mover disposed within the annular tube and including a cooler, a heat accumulator, and a heater arranged in sequence. The piston includes a valve body that separates the annular tube from the housing, separating the sound pressure within the annular tube from the pressure within the housing. The valve body has a connecting hole for connecting the annular tube and the housing. The thermoacoustic power generation system also includes a rupture-type safety valve disposed within the valve body and closing the connecting hole; the rupture-type safety valve opens the connecting hole when the pressure acting on the piston exceeds a predetermined value.

This invention belongs to the field of acoustic noise reduction and sound absorption materials technology, and discloses a thin-film coupled embedded neck cascaded sound absorption structure. The structure includes a top thin-film assembly and a lower embedded neck cascaded resonant cavity. The thin-film assembly includes a support frame and a thin film, which is suspended above the resonant cavity via the support frame, forming an air layer with the top wall of the resonant cavity. The resonant cavity is enclosed by a solid wall with sidewalls, a top wall, a middle partition, and a bottom wall. The middle partition divides it into upper and lower cavities. A first-stage embedded neck tube penetrates the top wall to the first cavity, and a second-stage embedded neck tube penetrates the middle partition and extends into both cavities. This invention combines the characteristics of thin-film vibration and cascaded resonant cavities, achieving broadband and efficient sound energy absorption in a compact space through multiple coupled resonances and viscous dissipation mechanisms. It significantly improves mid-to-low frequency sound absorption performance and is suitable for noise reduction in building, transportation, and industrial applications.

This invention discloses a processing technology for noise-reducing Y-type tees, belonging to the field of Y-type tee processing technology, including the following steps: S1, composite tube blank preparation step: a three-layer composite tube blank is formed by co-extrusion process. The three-layer composite tube blank consists of a micro-perforated plate layer, a cavity layer, and a structural layer from the inside to the outside. The micro-perforated plate layer has multiple through-holes. The effect is that the co-extrusion process forms a three-layer composite tube blank consisting of a micro-perforated plate layer, a cavity layer, and a structural layer from the inside to the outside, and after integrated molding, the cavity layer forms a closed sound-absorbing cavity, thus constructing a "micro-perforated plate-resonant sound-absorbing cavity" composite noise reduction structure. This structure utilizes the Helmholtz resonance principle. When the low-to-medium frequency noise generated by the fluid flowing through the Y-type tee enters the micropores, the air generates viscous friction and sound energy consumption within the micropores, while resonance consumes sound energy within the cavity, achieving efficient absorption of fluid dynamic noise.