64 results about "Sound baffle" patented technology

A light weight fully assembled speaker enclosure is provided that includes a backbox having a peripheral edge; a grill that is crimped around the peripheral edge of the backbox, and a sound-baffle sheet disposed between the backbox and the grill, the sound-baffle sheet having an opening for placement of a speaker. Also provided is a speaker system having an audio speaker; a backbox having a peripheral edge; a grill that is crimped around the peripheral edge of the backbox and that is affixed to the speaker; and a sound-baffle sheet disposed between the backbox and the grill, the sound-baffle sheet having an opening for placement of the speaker.

A sound baffle attached to a telephone handset comprises a pair of telescopically connected members shaped and dimensioned to act as a sound guide in combination with a reflecting cover plate that can be obliquely adjusted to direct the sound waves emitted by the user toward the handset microphone, and to muffle his conversation to the surroundings for improved privacy.

A speaker having a generally linear response by configuring two elastic members opposite one another so that any non-linearlity in the spring constant between an outward displacement versus an inward displacement are substantially cancelled. The present invention provides a pseudo linear spring constant throughout the range of travel of the cone and voice coil, or the sound baffle for a passive radiator. This minimizes the flexing of the cone and the wobble of the voice coil tube, or the baffle, as each travels to reproduce the audio waves.

A cooling system for light emitting diodes (LEDs) is provided that may comprise acoustic baffle members, a micro-channel heatsink that includes fins adjacent to the LEDs, and a fluid flow generator adjacent to the micro-channel heatsink that directs a fluid in a flow direction. The fluid flow generator may include an input to receive the fluid and an exit to exhaust the fluid, which may contact a surface area of the fins. The sound emitted by the fluid flow generator may be substantially cancelled by the acoustic baffle members, which may reflect the sound to a source location as reflected sound waves defined by a substantially inverted phase.

A sound-baffling arrangement for use in conjunction with an air-handling unit. One or more sound baffle columns are mounted for rolling or sliding movement within the interior of the air handling unit housing. Each baffle column may be selectively moved between a use position proximate to the fan assemblies, and a non-use position more distal from the fan assemblies. The movable sound baffles permit the air-handling unit to be fabricated to fit within a smaller housing, and thus to have a smaller, more economical footprint.

Disclosed is a compressible sound attenuation core, having one or more flexible, inflatable chambers, having one or more internal sound baffles. The chamber(s) can have at least one sound attenuation material affixed to a first pre-dominant surface of the inflatable chamber(s). The sound attenuation core can be further framed by a novel extruded frame system that provides, inter-connectivity, support and integrity to form portable, modular sound attenuation panels that can be used to construct a variety of soundproofing devices, including but not limited to, partitions, walls, enclosures, structures, offices, aircraft hangars, and booths.

The invention relates to a porous foam dual-surface sound adsorption ultra-thin sound baffle, belonging to the noise control technique. It comprises: two layers of porous plates, two layers of chambers, two groups of non-fiber sound adsorption porous material, a trapezium chamber, a folded baffle plate, and the frame. Wherein, two layers of chambers are arranged between the two layers of porous plates and two groups of non-fiber sound adsorption porous material; the trapezium chamber is arranged between two groups of non-fiber sound adsorption porous material and the folded baffle plate; the frame can fix the porous plates and the folded baffle plate; two groups of non-fiber sound adsorption porous material are fixed on the folded baffle plate; each back of said groups of non-fiber sound adsorption porous plates has a group of trapezium chamber; and two groups of trapezium chambers are meshed and filled by non-fiber sound adsorption porous material. the invention can be mounted between the upper and lower rails of railway or city road or between the driveways to reduce the traffic noise.

The invention discloses a multifunctional composite pipe silencer which comprises an exhaust barrel body, an expansion pressure-reduction device, a temperature-reducing energy-absorbing device, a frequency modulation and sound absorption device, a low-frequency sound elimination device, a high-frequency sound elimination device and a sound baffle device. The expansion pressure-reduction device, the temperature-reducing energy-absorbing device, the frequency modulation and sound absorption device, the low-frequency sound elimination device, the high-frequency sound elimination device and the sound baffle device are located in the cavity of the exhaust barrel body. A plurality of air through holes are formed in the peripheral face of the expansion pressure-reduction device. The temperature-reducing energy-absorbing device comprises a cooling liquid circulating chamber with a ventilation cavity and a cooling liquid coil arranged in the ventilation cavity, wherein the cooling liquid coil is filled with cooling liquid. The frequency modulation and sound absorption device comprises a plurality of air guide barrels, wherein air guide holes are distributed in the peripheral faces of the air guide barrels. The low-frequency sound elimination device comprises a plurality of single low-frequency sound elimination bodies. The high-frequency sound elimination device comprises a plurality of single high-frequency sound elimination bodies located among the adjacent single low-frequency sound elimination bodies, wherein the cross sections of the single high-frequency sound elimination bodies are V-shaped. The sound baffle device comprises a plurality of single sound baffle bodies located between two adjacent single high-frequency sound elimination bodies, wherein sound absorption layers are arranged in the sound baffle bodies. The multifunctional composite pipe silencer can reduce hot air flows and noise pollution of a fan or a chimney pipeline during exhausting.

The invention discloses an acoustic baffle composite structure for underwater detection equipment. The acoustic baffle composite structure comprises an acoustic baffle body, the acoustic baffle body comprises a cavity steel plate, a damping layer and a sound absorption layer, the cavity steel plate is of a main body supporting structure, the sound absorption layer and the damping layer are both pasted to the two sides of the cavity steel plate through mucilage glue, the cavity steel plate is formed by overlapping cavity steel plate units through flanges, each cavity steel plate unit is formedby welding a vertical face, a flange face and a bottom plate, a cavity is formed in each cavity steel plate unit, the damping layer is made of polyurethane underwater acoustic damping materials, and the sound absorption layer is of a wedge structure. According to the acoustic baffle composite structure for the underwater detection equipment in the invention, the cavity steel plate is adopted as asound insulation structure, propeller noise, mechanical noise and hull vibration radiation sound from the stern are reflected through an impedance mismatch effect, the reflection sound insulation effect is achieved, the influence of the noise on the underwater detection equipment is reduced, and therefore the detection performance of the equipment is improved.

The invention provides an underwater acoustic emission transducer and a making method thereof. The underwater acoustic emission transducer comprises an acoustic transmission main body (2), an emission-used piezoelectric element (3), a receiving-used piezoelectric element (8) and an anti-sound baffle (7), wherein the emission-used piezoelectric element (3) and the receiving-used piezoelectric element (8) are arranged in the acoustic transmission main body (2); and the receiving-used piezoelectric element (8) is configured to receive underwater acoustic signals emitted by the emission-used piezoelectric element (3). The problem that the working state of the emission transducer can not be judged during a use process can be effectively solved, and in application, the working condition of the emission transducer can be detected or recorded in real time.

The invention discloses a method for noise reduction of a working environment of an underwater detection device. The method comprises the following steps of analyzing noise spectrums generated in a bulbous bow flow guide cover by using a noise source spectrum characteristic analysis device; determining noise influences of noises on the interior of the bulbous bow flow guide cover according to thedivided noise values; comparing the noise influences generated in the bulbous bow flow guide cover with the maximum noise influence value which can be borne by the underwater detection device; and selecting and reasonably arranging a sound insulation baffle and a sound absorption baffle according to a comparison result. According to the method, three-dimensional modeling and acoustic simulation analysis are carried out on the bulbous bow flow guide cover for mounting the underwater detection device, and different noise reduction processing is selected according to noise characteristics and values, so that the noise reduction effect can be improved; and the noise influences generated in the bulbous bow flow guide cover are compared with the maximum noise influence value which can be borne by the underwater detection device, and arrangement and noise reduction measures are reasonably selected for the bulbous bow flow guide cover according to the comparison result, so that the noise reduction effect is high in stability.

The invention discloses a tricycle range extender. The tricycle range extender comprises a tricycle rack and a driving box, wherein a storage battery device and a driving motor are arranged in the driving box; the storage battery device comprises a storage battery group and a charging engine structure; the charging engine structure comprises a general-purpose engine body; an oil storage tank, a mounting panel, a stator tray, stators, a rotor, and a controller connected with the power-supply output end of the general-purpose engine body are arranged on the general-purpose engine body; the rotor is arranged in the stator tray and fixedly connected with an output shaft; the controller is connected with the storage battery group; sound isolation nets are arranged on the inner walls of the stator tray; a sound baffle screen is arranged in a protective cover; a heat dissipating fan is arranged between the sound baffle screen and the protective cover; a heat dissipating window is formed in the protective cover. The tricycle range extender disclosed by the invention is simple in structure, and convenient and rapid to operate. Through the adoption of the tricycle range extender, energy sources can be effectively saved; the service life of the storage battery group is prolonged; the service life of the stators and the service life of the rotor are prolonged. The tricycle range extender is high in stability and applicability.

The invention relates to a composite sound-proof baffle for a sonar array. The composite sound-proof baffle for the sonar array comprises a sound absorption baffle and an acoustic reflection baffle connected with the back of the sound absorption baffle, wherein the sound absorption baffle is made of porous material, the acoustic reflection baffle is composed of a foam core layer and an acoustic transmission composite shell which coats the foam core layer, the foam core layer is made of low-density polystyrene foam with reinforcing posts, and the acoustic transmission composite shell is composed of epoxy resin and glass fiber in a composite curing mode. When being used in water, water would completely enter pores of the porous material, when sound wave enters the porous material, the sound wave can be well absorbed by the foamed aluminum of the porous material, and the sound energy would be well converted into heat effect to be absorbed. The composite sound-proof baffle for the sonar array has the performances of the sound absorption material and acoustic reflection material, and through using the air-rich, light and low-impedance low-density polystyrene foam material as the acoustic reflection material, the composite sound-proof baffle is capable of resisting a high water pressure. The composite sound-proof baffle for the sonar array has a good sound insulation effect.

The invention relates to a light-weight composite sound baffle for a ship and a manufacturing method. The light-weight composite sound baffle comprises a lower panel located at the lower part, whereina rock wool layer is arranged at the upper part of the lower panel reticular glass fiber cloth is arranged on the top surface of the rock wool layer; the light-weight composite sound baffle further comprises an upper panel located at the upper part; the upper panel is parallel to the lower panel; a glass wool layer is arranged on the bottom surface of the upper panel; reticular glass fiber clothis arranged on the bottom surface of the glass wool layer; the reticular glass fiber cloth of the rock wool layer and the reticular glass fiber cloth of the glass wool layer are arranged by keeping aninterval; an air layer is formed in the interval; side panels are welded on the two sides of the upper panel and the lower panel respectively; and a quadrilateral structure is defined by the upper panel, the lower panel and the two side panels. On a basis of a transmission and reflection mechanism in air sound wave propagation, impedance mismatch is achieved using a structural form with materialson the two sides having different densities and thicknesses; no connection is made in the middle of a structure; vibration transmission is reduced; and sound insulation of the structure is further improved.

A compact silencer device for a firearm comprising of multiple chambers which trap the gases from a projectile exiting the barrel of a gun to slow down the gases and reduce the temperature, sound, and flash associated with the projectile. In one embodiment, the first chamber which attaches to the barrel of the firearm comprises of sound baffling materials or gas porting baffles which vent gases from the second chamber passing rearward. The second chamber comprises of a chamber which can accommodate a retractable third chamber of the device, the second and third chamber of the device can have sound baffles to slow down the gases from the projectile.

The invention relates to a modular underwater pressure-resistant sound insulation baffle. The baffle structure is formed through pasting multiple modules, the modules include spherical shells which are hollow and sealed inside, outer peripheral surfaces of the spherical shells are coated with silicone rubber, an outer casing is coated on the outer periphery of the silicone rubber, and a vulcanizedrubber sheet is bonded to the outer periphery of the outer casing. The baffle structure is advantaged in that the structure is simple and is convenient to use, through optimizing the thickness of thestainless steel spherical shells as well as the rubber density, the overall equivalent density of the baffle structure is the same as the water, the weight of a carrier in an underwater use state isnot increased, the good middle and low frequency sound insulation effect is achieved, the modular structure facilitates batch processing and modular cutting, and the environment in which the scale changes can be effectively adapted.

An assembly type acoustic metamaterial comprises a membrane type acoustic metamaterial and an assembly part, the membrane type acoustic metamaterial comprises one or more membrane type acoustic metamaterial units, and the assembly part is arranged on the membrane type acoustic metamaterial and used for achieving assembly connection between the multiple assembly type acoustic metastructures and/or between the assembly type acoustic metastructures and a supporting structure so that an assembly type acoustic metastructure layer can be formed through assembly connection. An acoustic baffle comprises an acoustic metamaterial layer, the acoustic metamaterial layer comprises a plurality of the assembly type acoustic metamaterial bodies, and the assembly type acoustic metamaterial bodies are assembled and connected together through the assembly parts. The performance of a large-size sound insulation board constructed based on the assembly type acoustic metamaterial tends to the performance of a small-size assembly type acoustic metamaterial in a designed frequency band, and the sound insulation effect of a designed target frequency band, especially a low frequency band, is improved.

The invention discloses a noise-reducing shipboard sonar array sound baffleplate device, mounted with a sound isolating layer, a sonar array and depression bar from a base array frame to outside; mounted with a sound baffleplate and a rubber pad form inside to outside between the sound isolating layer and the sonar array, two surfaces of the sound baffleplate are both pasted with above a pair of piezoelectric pieces, which connect with lead wires, where the lead wires near to the sonar array are led out through the rubber pad and the base array frame, and the lead wires of the piezoelectric piece near to the ship casing are led out through the sound isolating layer and the base array frame. It effectively reduces the noise radiated from the ship casing to the sonar array and increases the detection distance of the sonar.

The invention relates to the technical field of noise reduction for a transformer, and discloses a noise reduction device for the transformer, through which noises produced during operation of the transformer can be effectively reduced. The noise reduction device for the transformer comprises two sound insulation layers, a sound insulation reinforcing plate, a middle sound insulation plate, an upper sound insulation plate, a plurality of T-shaped sound absorption interlayers, intermediate sound insulation plates, outer sound insulation plates, sound baffling plates shaped like broken lines, asound absorption plate, and a plurality of oval sound absorption layers, wherein the two ends of the sound insulation reinforcing plate are respectively fixed on the two sound insulation layers; the two ends of the middle sound insulation plate are respectively fixed on the two sound insulation layers, and the middle sound insulation plate is located above the sound insulation reinforcing plate; the two ends of the upper sound insulation plate are respectively fixed on the two sound insulation layers, and the upper sound insulation plate is located above the middle sound insulation plate; theT-shaped sound absorption interlayers are arranged between the middle sound insulation plate and the upper sound insulation plate; the intermediate sound insulation plates are adhered to the outer walls of the sound insulation layers; the outer sound insulation plates are connected with the intermediate sound insulation plates; the sound baffling plates shaped like the broken lines are arranged between the intermediate sound insulation plates and the outer sound insulation plates; the sound absorption plate is fixed on an upper end surface formed by the intermediate sound insulation plates andthe outer sound insulation plates; and the oval sound absorption layers are embedded in the sound absorption plate and arranged in sequence. The noise reduction device for the transformer provided bythe invention has the advantages of high simplicity in structure, low cost, and high easiness in mounting and dismounting.

The invention discloses an underwater pressure-releasing sound-reflecting baffle which comprises a sound-reflecting structure, a sealing pressure-releasing structure and a limiting vibration-reducingmounting structure; the sound-reflecting structure is mounted in the sealing pressure-releasing structure through the limiting vibration-reducing mounting structure to form a sound reflection baffle plate; the sealing pressure-releasing structure comprises a displacement compensation frame, and the sound reflection baffle plate can achieve underwater pressure relief through elastic deformation ofthe displacement compensation frame. The sound reflection baffle plate is based on acoustic characteristics of a porous material; a liquid saturated open-cell foam metal is used as a main sound-reflecting functional material; a pressure release structure is packaged on the outer layer of the liquid saturated open-cell foam metal; through the position compensation structure and the liquid filled inthe position compensation structure, internal and external pressure balance can be realized, underwater pressure release of the sound reflection baffle plate under high hydrostatic pressure is further realized, and compared with the prior art, under the same high hydrostatic pressure, the weight and the thickness of the sound reflection baffle plate can be remarkably reduced, and the sound insulation effect is improved.