26 results about "Sound baffle" patented technology

The invention discloses a sound barrier sound insulation characteristic evaluation method suitable for a real ship complex sound field, and belongs to the technical field of real ship sound barriers, and the method comprises the steps: arranging hydrophone arrays at acoustic mirror symmetry positions at two sides of a real ship fairing sound barrier to form an in-situ measurement pair; controlling the ship to sail at a plurality of navigational speeds, and synchronously acquiring sound pressure time domain signals on two sides; carrying out preprocessing and time-frequency analysis on the signals, and calculating sound pressure levels of a sound facing surface and a sound backing surface to obtain an in-situ sound pressure level difference; and based on the sound pressure level difference at different navigational speeds, analyzing the change rule of the sound insulation performance along with the frequency and the navigational speed, and carrying out comprehensive evaluation. In addition, by arranging a vibration sensor and a turbulence measuring device, path separation of structural sound and flow-induced noise is achieved, spatial coherence weighted average is introduced, and the accuracy and representativeness of evaluation under a complex sound field are improved. The method overcomes the limitations of laboratory test environment distortion and single working condition, and can truly and comprehensively reflect the actual sound insulation efficiency of the sound baffle in the dynamic navigation of a real ship.

A compact silencer (suppressor) device for a firearm including 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 includes sound baffling materials or gas porting baffles which vent gases from the second chamber passing rearward. The second chamber includes 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 utility model relates to the technical field of wooden bridge opening plates, and discloses an anti-deformation wooden bridge opening plate with a multi-layer composite structure, which comprises a center plate, an upper side plate is arranged on one side of the outer surface of the center plate, and an upper side protection plate is arranged on one side of the outer surface of the upper side plate. A lower side plate is arranged on the side, away from the outer surface of the upper side plate, of the outer surface of the center plate, a lower side protection plate is arranged on one side of the outer surface of the lower side plate, a center shaft rod is arranged on one side of the outer surface of the center plate, the upper side plate comprises upper side filler, a buffer block is arranged in the upper side filler, and the lower side plate comprises lower side filler. And a sound insulation plate is arranged in the lower side filler. According to the utility model, the plurality of central shaft rods are arranged in the device, the plurality of central shaft rods are uniformly arranged in the central plate, and the central shaft rods are made of wood structures, so that when the plate is stressed, a certain supporting effect can be started, and the deformation is prevented.

The utility model discloses a railway engineering construction is with noise reduction device, including first support seat and second support seat, the bottom of first support seat and second support seat all is fixedly connected with base, first support seat and second support seat's front and back both sides all are fixedly connected with triangle steady block. The utility model discloses through setting up first sound baffle, second sound baffle, sliding slot, slide column, sliding sleeve etc. Structure makes the relative position between first sound baffle and second sound baffle can adjust, thereby realizes the length's adjustment of noise reduction device, can adapt to different construction scene and noise reduction demand, has improved the practicality of device greatly.

According to the portable ultra-short baseline transducer array and the underwater acoustic positioning system provided by the invention, the transmitting performance of the transmitting part is adjusted by utilizing the sound reflecting baffle, the mounting, positioning and watertightness of the transducer array are realized, and the transducer array can be used for the portable underwater acoustic positioning system. The portable ultra-short baseline transducer array comprises a sound reflecting baffle, a transmitting ceramic circular ring, a receiving ceramic circular ring, a receiving fixing frame and a receiving top cover plate, one end of the transmitting ceramic circular ring is coaxially arranged on the sound reflecting baffle through an insulating washer, and the other end of the transmitting ceramic circular ring is coaxially arranged with the receiving fixing frame; a plurality of receiving ceramic circular rings are distributed on the surface of the receiving fixing frame in an array manner; therefore, a transducer array main body structure is formed; a watertight layer is arranged outside the transducer array main body structure; and the bottom surface of the sound reflecting baffle is exposed out of the watertight layer and is provided with a wire outlet hole and a positioning mounting structure.

The utility model provides a mega bass horn damping structure used on a KTV all-in-one machine, comprising a box body, a horn and a damping assembly, the horn and the damping assembly are installed in the box body, the damping assembly comprises a sound insulation board and a reflector, the reflector is arranged on the opposite side of the horn, the reflector is provided with a reflection surface protruding towards the horn, and the sound insulation board is arranged on the sound insulation board. The sound insulation plates are arranged in the cavity of the box body and located on the two sides or the peripheral side of the loudspeaker piece and the reflector, a hollow sound guide cavity is formed between the loudspeaker piece and the reflector and used for transmitting sound emitted by the loudspeaker piece to the reflector through the sound guide cavity, and the reflecting face reflects the sound and dispersedly transmits the sound into the sound guide cavity. The damping structure of the mega bass horn effectively reduces resonance of a ktv all-in-one machine caused by the mega bass horn, and improves stability and durability of a sound box.

The application provides a piezoresistive sound pressure gradient hydrophone, which comprises two ceramic substrate printed circuit boards in the shape of a disc, four piezoresistive strain gauges, a base and a sound insulation barrier, the piezoresistive strain gauges are welded on the ceramic substrate printed circuit boards in the shape of a disc, the edges of the ceramic substrate printed circuit boards in the shape of a disc are supported on the base, a bending disc type vibration system with edges simply supported and a middle free is formed, the bending disc type vibration system does forced bending vibration under the action of underwater sound waves, the piezoresistive strain gauges welded thereon are extruded and stretched, and thus impedance change occurs; the ceramic substrate printed circuit boards simultaneously play a signal conditioning role, and the impedance change of the piezoresistive strain gauges is converted into voltage change through a Wheatstone bridge type circuit structure; the sound insulation barrier isolates the two ceramic substrate printed circuit boards in the shape of a disc, a sound path difference is formed, and the signals of the two ceramic substrate printed circuit boards are subtracted to obtain a sound pressure gradient signal. The application has the advantages that machine and electric integration is realized, and miniaturization is realized.

The invention relates to the technical field of fan noise reduction, in particular to an adjustable fan acoustic liner and a noise reduction method and system.The adjustable fan acoustic liner comprises a perforated plate, a honeycomb cavity layer, a cavity layer filling block and a supporting layer; the cavity layer filling blocks are arranged on the supporting layer in an array mode, the honeycomb-shaped cavity layer is arranged on the outer sides of the cavity layer filling blocks in a sleeving mode, and the perforated plate covers the honeycomb-shaped cavity layer; the cavity layer filling blocks are arranged in an array mode to form a plurality of cavity adjusting areas, and the cavity adjusting areas are arranged in the circumferential direction of the supporting layer at intervals. The cavity layer filling blocks are arranged in an array mode, the multiple cavity adjusting areas are obtained, the noise reduction requirements of noise of different frequencies can be met by changing the heights of the cavity layer filling blocks, the noise reduction frequency can be widened by arranging the multiple cavity layer filling blocks of different heights in the cavity adjusting areas, multi-section coverage from low frequency to high frequency is achieved, and the noise reduction effect is improved. The sound absorption coefficient in a target frequency band can reach 0.9 or above, and the noise reduction requirement is met.

A noise reducing baffle system for an indoor pickleball court includes a noise baffle cloud grid suspended above a surface of the indoor pickleball court. The indoor pickleball court includes an outer perimeter line which defines a playing area. The noise baffle cloud grid is suspended entirely within the outer perimeter line of the playing area and is suspended between about 18 feet and about 20 feet above the surface of the indoor pickleball court.

The invention provides a low-flow-resistance sound-transmission flow guide structure of an underwater unmanned vehicle and a manufacturing method, and belongs to the technical field of underwater unmanned vehicle carrier structures. The low-flow-resistance sound-transmission flow guide structure comprises a body shell plate and a sound-transmission dorsal fin flow guide cover; the body shell plate and the sound transmission dorsal fin fairing are of an integrated structure made of different materials, the body shell plate is installed on a carrier structure of the unmanned underwater vehicle, a load sound baffle is installed in the sound transmission dorsal fin fairing, and a hydrophone array element is installed between the load sound baffle and the sound transmission dorsal fin fairing. The low-flow-resistance sound-transmission flow guide structure provides a high-sound-transmission carrying environment for the hydrophone array elements and protects the hydrophone array elements in all directions, and meanwhile, the structure serves as a part of an unmanned underwater vehicle carrier structure to meet the requirements for strength, low flow resistance and low noise of the unmanned underwater vehicle carrier structure. According to the low-flow-resistance sound-transmitting flow guide structure, the incident flow area exceeding the envelope surface of the unmanned underwater vehicle is reduced to the maximum extent, and the influence of overall water resistance and navigation noise is reduced to a reasonable level.

A sound baffle assembly includes a plurality of walls defining a space between the walls. At least one acoustic scatterer is disposed within the space between the walls. The at least one acoustic scatterer has an opening and at least one channel. The at least one channel has a channel open end and a channel terminal end, wherein the channel open end is in fluid communication with the opening.

The application provides a damping and noise reduction device for a floating buoy sonar and belongs to the technical field of damping and noise reduction. The device solves the problem of double interference of floating buoy platform vibration and self-noise and flow noise, which leads to low signal-to-noise ratio, poor precision and poor environmental adaptability of the vector sonar detection, and the limited effect of the existing single damping or noise reduction means. The damping and noise reduction device comprises a fairing, a sound barrier and a sonar fairing, the vector sonar array is arranged in the sonar fairing, the sound barrier is arranged above the sonar fairing, the fairing is connected above the sound barrier, the damping disc is arranged in the cavity formed by the sound barrier and the fairing, the damping disc is connected with the cable, the cable is connected with the buoy, the sound barrier comprises a circular assembly and a plurality of spherical assemblies, the circular assembly is connected with the sonar fairing, and the plurality of spherical assemblies are arranged on the outer side of the circular assembly in the circumferential direction. The device is mainly used for damping and noise reduction of the floating buoy sonar.

The invention discloses a dynamic measurement system and method for the in-situ sound insulation performance of a ship sound baffle, and belongs to the technical field of ship sound baffle sound insulation performance measurement. The dynamic measurement system for the in-situ sound insulation performance of the ship sound baffle comprises an acquisition module which comprises a first hydrophone array and a second hydrophone array, the first hydrophone array is used for acquiring a time-domain sound pressure signal of a sound facing surface of the sound baffle, and the second hydrophone array is used for acquiring a time-domain sound pressure signal of a sound backing surface of the sound baffle; the data storage module is used for receiving and storing the time domain sound pressure signals, output by the acquisition module, of the sound facing surface and the sound backing surface of the sound baffle; and the data analysis module is used for calculating sound pressure levels of the sound-facing surface and the sound-backing surface according to the time domain sound pressure signals of the sound-facing surface and the sound-backing surface of the sound baffle, and obtaining a noise reduction effect of the sound baffle according to the sound pressure levels of the sound-facing surface and the sound-backing surface.

The application belongs to the technical field of underwater acoustic transducers, and particularly relates to an integrated vibration reduction mounting structure of a hydrophone and a sound barrier, which comprises a hydrophone, a vibration reduction frame and a sound barrier, the vibration reduction frame is provided with an accommodating opening at the top, and the vibration reduction frame is penetrated through at two sides, the hydrophone is mounted in the accommodating opening, the sound barrier is mounted in the vibration reduction frame and penetrates through the two sides of the vibration reduction frame, the sound barrier is provided with a mounting hole for accommodating the hydrophone, and the tail of the hydrophone penetrates through the mounting hole of the sound barrier and out of the vibration reduction frame, the rubber encapsulation structure outside the hydrophone and the vibration reduction frame are integrally vulcanized and formed, which is favorable for improving the connection reliability between the two and increasing the stability, and the rubber encapsulation structure provides the water-tight encapsulation function and the rubber vibration reduction function for the internal sensing elements of the hydrophone.

A kind of wideband anti-sound double-dot array structure based on additive manufacturing, manufacturing method and application belong to the technical field of dot array metal additive manufacturing.The structure is composed of three periodic minimal surface Gyroid structure and Split-P structure in series, is integrally generated using parameterized modeling method, and the two structures are gradually transitioned and smoothly regulated through Ramp function, the average anti-sound coefficient greater than 0.6 is realized in the wideband of 50Hz~4000Hz under water by controlling the structure parameters of the two three-periodic minimal surface dot array structures, and the two structures are coupled in series to compensate each other in acoustic response, and the band gap problem of single structure is solved, the material used is 316L stainless steel, the manufacturing method used is selective laser melting and welding, and high-precision double-dot array structure is realized by optimizing the additive manufacturing printing process parameters of the transition zone of the double structure, and is suitable for unmanned underwater vehicle, sonar structure sound barrier.

The utility model relates to the technical field of motor fitting detection, in particular to a stator detection device for a motor production line. A sound insulation plate covers the upper surface of the detection table, a vertical plate and a detector are installed on the detection table on the inner side of the sound insulation plate, an installation column is fixedly connected to the outer wall of the upper end of the vertical plate, sliding grooves are formed in the upper surface of the detection table on the two sides below the installation column, and supporting assemblies are installed on the sliding grooves and the detection table. Noise generated in the production line environment is isolated through the sound insulation plate, noise is absorbed through cooperation with the sound absorption cotton, noise transmitted into the inner side of the sound insulation plate is reduced, interference of environmental noise on acoustic detection is reduced, and the stator acoustic detection precision is guaranteed; various motor stators are supported by sliding, positioning and adjusting the supporting assembly, so that the stators are in a stable state during detection, the influence of instability of the stators on detection is reduced, and the detection precision of the device is ensured.

The invention discloses a low-resistance acoustic lining panel with elliptical holes and a design method thereof, the low-resistance acoustic lining panel comprises a perforated plate, a plurality of uniformly distributed through holes are formed in the perforated plate, the hole opening direction of the through holes is perpendicular to a fixed wall, and the through holes are elliptical holes; the short axis direction of the elliptical hole is the same as the airflow direction; the short axis length of the elliptical hole is greater than the thickness of the acoustic viscosity boundary layer corresponding to the target sound wave frequency; the elliptical holes are uniformly distributed in rows and columns on the fixed wall, and the elliptical holes in adjacent rows are distributed in a staggered manner, so that the elliptical holes in the middle row and the center connecting lines of the left and right adjacent elliptical holes in the front and back rows can form an equilateral triangle. According to the acoustic liner perforated plate, the hole shape of an existing acoustic liner perforated plate is changed into the oval shape from the original round shape, the size of the oval hole is designed, the flow resistance coefficient of the acoustic liner can be reduced on the premise that the overall acoustic performance of the acoustic liner is not changed, the considerable resistance reduction effect is achieved, and therefore oil consumption of an airplane can be reduced.

The invention discloses a low-resistance acoustic lining panel based on crescent inclined open pores and a design method thereof, the structure adopts a perforated plate with crescent inclined open pores to replace a circular perforated plate of an original acoustic lining, the crescent opening direction is consistent with the airflow direction, and by reducing the size of the open pores in the flow direction and reducing the airflow entering a cavity, the low-resistance acoustic lining panel is formed. Therefore, the flow resistance of the acoustic liner is reduced, the sectional area of the opening is kept unchanged, and the acoustic performance of the acoustic liner is ensured to be unchanged.

The earphone assembly comprises an earphone and a sound blocking plate, the earphone comprises a shell and a loudspeaker assembly, the shell is provided with a sound outlet hole, a containing cavity and a sound guiding channel are arranged in the shell, the sound outlet hole is communicated with the containing cavity through the sound guiding channel, and the loudspeaker assembly is arranged in the containing cavity. The loudspeaker assembly is arranged in the accommodating cavity so as to make a sound which is led out through the sound guide channel and the sound outlet hole in sequence; the sound baffle plate is arranged on one side of the shell provided with the sound outlet hole and extends away from the shell. The helmet comprises a helmet body and earphone assemblies, the earphone assemblies are arranged on at least one side of the helmet body, the sound outlet holes are used for conducting sound towards human ears, and the sound baffle is located on the outer side of the helmet body. According to the earphone assembly, the directional acoustic technology is utilized to control the transmission direction of the sound, so that the earphone assembly is applied to the helmet to open the two ears and transmit the sound to the human ears at high efficiency, a user can clearly hear the sound of the surrounding environment while enjoying music or conversation, the safety in the riding process is ensured, and the user experience is improved. Moreover, discomfort such as ear expansion and ear pressing can be avoided after long-time wearing.

The invention provides a gymnasium wall sound gate type invisible access hole device which structurally comprises a fusion layer, a positioning frame, an empty groove, a contact wall, a groove, a positioning block and a novel opening and closing structure, the fusion layer and the positioning frame are integrated, the empty groove penetrates through the surface of the positioning frame to expose the contact wall and the groove, and the positioning block is installed at the upper position and the lower position of the positioning frame to be communicated with the groove; on the basis of a novel opening and closing structure, two magnetic attraction blocks on a sound insulation plate are embedded into a groove and are overlapped with a contact wall in parallel, and then a control structure is combined with a sliding rail to drive a rubber block to slide, so that the rubber block is embedded into a positioning block to be fixed; therefore, the process of facilitating opening and closing and replacing original locking of a plurality of bolts on the edge can be effectively formed, the phenomenon of thread disengagement is completely avoided, the service life of the device is prolonged, and then a folding cover connected to the lower portion of a shifting block of the control structure can cover the surface of a sliding rail when the shifting block slides up and down. And an over-conspicuous area is avoided.

The utility model relates to a kind of airflow buffer type sound baffle sound barrier of sound absorption board, including sound absorption board body and the buffer assembly being set in the both sides of sound absorption board body, two described buffer assemblies are respectively set in the opposite side of two slot type columns;The buffer assembly includes inner gasket, frame clamping plate and positioning frame, the inner gasket is set as open frame structure, and is set in the side edge of sound absorption board body, the frame clamping plate is set in the outer periphery of inner gasket, and located inside positioning frame, the side plate of frame clamping plate is opposite side with the inner wall of slot type column Setting has compression spring piece;Multiple fasteners are screwed on the slot type column, and fastener is fixed and limited in the inside of slot type column with positioning frame.This utility model is by the buffer assembly and its cooperation structure of the both sides of sound absorption board body and the cooperation of slot type column, constitute independent buffer system, not only improve the long-term sound insulation and sound absorption performance of sound barrier, but also be convenient for and existing column adaptation replacement, can improve installation maintenance efficiency.

The invention discloses a broadband anti-sound double-lattice structure based on additive manufacturing and a manufacturing method and application thereof, and belongs to the technical field of additive manufacturing of lattice metal. The structure is formed by connecting a three-period minimal curved surface Gyandroid structure and a Spit-P structure in series and is integrally generated by adopting a parameterized modeling method, the two structures are gradually transited and smoothly regulated and controlled through a Ramp function, and the two structures are mutually compensated in acoustic response by controlling the structure parameters of the two three-period minimal curved surface lattice structures and adopting a series coupling design, so that the acoustic response of the Gyandroid structure and the Spit-P structure is enhanced, and the acoustic response of the Gyandroid structure and the Spit-P structure is enhanced. The problem that a single structure has a band gap is solved through series connection of the two structures, and the average anti-sound coefficient larger than 0.6 is achieved within the broadband of 50-4000 Hz underwater. The adopted material is 316L stainless steel, the adopted manufacturing mode is selective laser melting and welding, high-precision preparation of the double-lattice structure is achieved by optimizing double-structure transition area additive manufacturing printing process parameters, and the manufacturing method is suitable for unmanned underwater vehicles and sonar structure sound baffles.

A portable blockchain mining system has a portable enclosure having end walls, side walls, a base, and a roof, which collectively define an interior; an air inlet defined in a first end wall of the end walls; an air outlet defined in a second end wall of the end walls, opposite the first end wall; one or more air filters; a plurality of blockchain mining processors mounted on a rack downstream of the air filter; and sound baffles within the interior adjacent the air inlet and the air outlet.

The application discloses a sound barrier applied to a flooding transducer and the flooding transducer, which comprises a plurality of array-arranged air pipe assemblies, and a plurality of stepped working air pressures are arranged in the air pipes in the air pipe assembly array, so that the air pipe assembly array forms a plurality of specific air pressure air pipe arrays which are superimposed or nested; the sound barrier applied to the flooding transducer and the flooding transducer provided by the application are characterized in that: the protection pipes are arranged on the outer periphery of the air pipes to protect the air pipes; the plurality of stepped working air pressures are arranged in the air pipes in the air pipe assembly array, so that the air pipe assembly array forms a plurality of specific air pressure air pipe arrays which are superimposed or nested; the arrangement of the plurality of specific air pressure air pipe arrays can make the sound barrier have a better sound reflection effect in a wider depth range, so that the flooding transducer can have better acoustic performance.

The utility model provides a low noise mower relates to mower technical field, the utility model discloses a shell is installed with gyro wheel in the bottom of shell, wherein gyro wheel places in ground can drive shell to remove, the motor is installed in the inside of shell by means of support, the motor is installed with cutting knife by means of speed reducer, wherein the motor can drive cutting knife to rotate and clean the lawn, the sound insulation device is set up at the top of shell by means of auxiliary device, wherein the sound insulation device can isolate the noise of motor vibration, the sound insulation device includes sound insulation cover, the sound insulation cover is installed at the top of shell by means of auxiliary device, the top of sound insulation cover is installed with exhaust pipe, wherein the inside fixed connection of exhaust pipe has a plurality of spoon shape's sound baffle, the utility model reaches the effect of weakening the sound of motor vibration by sound insulation device, avoids the noise of mower, thereby influences people's normal rest or work.