55results about How to "Attenuate sonic energy" patented technology

The invention discloses a composite heat-insulation and sound-insulation plate. The composite heat-insulation and sound-insulation plate comprises a first layer, a polyurea aerogel layer and a second layer which are stacked sequentially, wherein a first sound attenuation interface which is used for attenuating sound is formed between the first layer and the polyurea aerogel layer; and a second sound attenuation interface which is used for attenuating sound is formed between the second layer and the polyurea aerogel layer. In a sound transmission process, sound is transmitted in a cross-medium mode for several times, and energy of the sound is consumed greatly. In the next place, a micro-nano-level porous structure assembled by polyurea nano fibers and nano particles in the polyurea aerogel layer of the composite heat-insulation and sound-insulation plate can effectively attenuate energy of sound waves, and effects of insulating sound and reducing noises are achieved. Moreover, because the polyurea aerogel layer is a porous material, an insulation function can be fulfilled. In addition, the size of the polyurea aerogel layer is large, and the polyurea aerogel layer can serve as a building board directly. Therefore, the composite heat-insulation and sound-insulation plate can serve as a building material, and heat-insulation and sound-insulation functions are fulfilled.

The invention discloses cement-based self-leveling mortar and a preparation method thereof. The cement-based self-leveling mortar is prepared from a cement-based self-leveling mortar matrix and a mixture with sound insulation and waterproof functions, wherein the mixture with the sound insulation and waterproof functions comprises a sound absorption material, a waterproof material and a cementingmaterial. According to the invention, three important characteristics including water resistance, sound insulation performance and self-leveling performance are perfectly fused together, and performance conflicts in respective raw material performances are effectively solved, so the self-leveling mortar with excellent performance and sound insulation and water resistance functions is obtained.

The invention discloses a silencer of an automobile air-conditioning system pipeline. The silencer is installed in a refrigerant circulation pipeline, and comprises a shell (3), a gas intake pipe (1) and a gas exhaust pipe (2), wherein the gas intake pipe (1) and the gas exhaust pipe (2) are arranged on the same wall surface of the shell; the shell (3) is internally provided with a reflection plate (4) at the opposite side of the gas intake pipe (1) and the gas exhaust pipe (2). The silencer of the automobile air-conditioning system pipeline is simple in structure, is convenient to connect, and can well reduce noise generated by the flowing of an automobile air-conditioning system refrigerant in a pipeline, so that the influences on noise inside and outside an automobile by gas intake noise can be reduced, and the NVH performances of a finished automobile are improved.

The invention discloses a denoising and tail gas removing isolation room for automotive drum tests. The denoising and tail gas removing isolation room comprises a working chamber which is internally provided with a drum test platform, and the working chamber comprises two right opposite automatic doors; walls of the working chamber are sound insulation walls, and each sound insulation wall comprises a perlite sound absorption board, a vacuum glass layer and a cement and sawdust sound absorption board which are sequentially arranged from inside to outside; the portion between each perlite sound absorption board and the corresponding vacuum glass layer is filled with glass wool, and the portion between each vacuum glass layer and the corresponding cement and sawdust sound absorption board is filled with glass wool; a temperature adjusting device, a centrifugal fan, a filtering device and a three-way catalysis device are further arranged in the working chamber, an air inlet of the centrifugal fan is right opposite to the drum test platform, and an exhaust duct of the centrifugal fan is sequentially communicated to the filtering device and the three-way catalysis device. The denoising and tail gas removing isolation room is used for solving the problems of large noise pollution and tail gas pollution caused in a workshop in the existing drum test process and achieving the purposes of reducing the noise pollution and tail gas pollution in the workshop.

The invention relates to an aerogel anti-noise earplug comprising a body. The body includes at least one sound insulation section made of polyurea aerogel. The sound insulation sections of the aerogel anti-noise earplug are made of polyurea aerogel, and a micro-nano porous structure self-assembled with polyurea nanometer fibers and nanometer particles in the polyurea aerogel layer can effectively attenuate acoustic energy. Therefore, the aerogel anti-noise earplug of the invention can achieve the effects of sound insulation and noise reduction, and has a good sound insulation effect.

The invention discloses a silencing slope structure of an artificial landscape waterfall. The silencing slope structure comprises a slope, wherein N layers of multi-hole sound absorption plates which are outwards protruded and parallel to each other are arranged on the slope; a plurality of tile-shaped silencing tiles are fixed on the surface of the slope; the silencing tiles are made of rubber materials; the concave surfaces of the silencing tiles face to the slope; and N is an integer greater than or equal to 2. The invention aims at providing the silencing slope structure of the artificial landscape waterfall, so as to solve the problem that the landscape waterfall in a city makes great noise which disturbs residents nearby in the prior art and fulfill the aim of reducing the noise disturbance caused by the landscape waterfall in the city.

The invention discloses a strain pickup magnetic adsorption optical cable, which comprises a tightly packaged optical fiber. The outer surface of the tightly packaged optical fiber is closely providedwith an optical fiber outer sheath. A protective layer is arranged on the outer side of the optical fiber outer sheath, a plurality of adsorption elements wrapping the outer side of the optical fiberouter sheath are arranged in the protective layer, and the adsorption elements are distributed at intervals in the length direction of the tightly-packaged optical fiber. The adsorption element is tightly attached to the inner wall of the sleeve, external earthquake sound waves can directly act on the sensing optical cable after being transmitted to the sleeve, energy loss in the process from thesleeve to the optical cable is reduced, the weak earthquake signal pickup capacity of the optical cable is improved, and the weak earthquake signal response capacity of the system is improved. The tightly packaged optical fiber, the optical fiber outer sheath, the adsorption element and the protection layer are tightly attached without any gap, so that most of sound wave signals acting on the optical cable are loaded to the optical fiber, attenuation of sound wave energy by an ointment layer and an air layer in the optical cable is reduced, and the weak signal pickup capability of the opticalfiber is improved.

The invention discloses a multifunctional, heat-insulating, sound-insulating and waterproof interior and exterior wall putty and a preparation method thereof. The putty comprises 50-55 parts of a multifunctional emulsion, 15-20 parts of aluminum silicate ceramic fibers, 25-30 parts of zirconium oxide hollow microspheres, 1-2 parts of titanium dioxide, 2-5 parts of a dispersant, 0.5-1 part of a defoaming agent and 1-2 parts of a suspending agent. The putty is a comprehensive compatible material integrating heat insulation, damping, sound insulation, impermeability and waterproofness. The comprehensive compatible material integrating heat insulation, damping, sound insulation, impermeability and waterproofness is provided to solve the problems of hollowing, cracking, falling off, water seepage, function loss due to different shrinkage values and different adhesion degrees of the material in separate construction of different materials having heat-insulating, sound-insulating and waterproof functions, and the construction is completed at a time, so that the cost of materials and construction production is effectively reduced.

The invention discloses a sound isolation and noise reduction method for a washing machine. According to the method, a sound isolation coating is coated on the surface of an outer barrel of the washing machine, micro particles having a sound isolation effect are uniformly distributed in the sound isolation coating, and transmitting sound wave energy is reduced, so that the effect of sound isolation and noise reduction is achieved.

The invention relates to a preferable structure of a film bulk acoustic resonator with a high quality factor, and the structure comprises a substrate with a groove on the upper surface, a bottom electrode layer positioned above the substrate and a piezoelectric layer, and is characterized in that the structure also comprises a top electrode layer with a special-shaped air bridge structure; the special-shaped air bridge structure is internally provided with a sound springback structure which can play a role in springback of transverse sound waves and improve the quality factor of the film bulk acoustic wave resonator. The acoustic springback structure is made of a SiC and perovskite combined thin film medium or a SiN and perovskite combined thin film medium; the acoustic springback structure is a polyhedron opposite to a bridge cavity of the special-shaped air bridge structure and clings to the upper portion of the piezoelectric layer in a horizontal mode, and an air gap is reserved between the upper portion of the acoustic springback structure and a bridge cavity suspension structure of the special-shaped air bridge structure; the left side face and the right side face of the sound rebound structure are tightly attached to the grooves in the adjacent inner side faces of the bridge cavity supporting structure of the special-shaped air bridge structure respectively. The quality factor of the film bulk acoustic resonator can be remarkably improved.

The invention discloses an environment-friendly fireproof acoustic board which comprises a bottom board and a base board, the bottom board and the base board are made of metal materials, the thickness of the base board is 0.5-1 cm, a plurality of arc-shaped protruding blocks are arranged on the face, away from the bottom board, of the base board, and sound absorption holes are formed in the other face, opposite to the arc-shaped protruding blocks, of the base board. The sound absorption holes and the arc-shaped protruding blocks are coaxially arranged, holes are formed in the arc-shaped protruding blocks, the width of each arc-shaped protruding block is 2-3 cm, the height of each arc-shaped protruding block is 0.5-1 cm, the fillet of each arc-shaped protruding block is 0.2-0.5 cm, the sound absorption holes are funnel-shaped, the width of each sound absorption hole is 1-2 cm, and the angle of each sound absorption hole is 30-50 degrees. According to the invention, sound waves enter the sound absorption holes through the holes, and drive air to vibrate in the sound absorption holes, so that the vibrating air is continuously converted into heat energy, the sound wave energy is attenuated, the sound waves are reflected by the arc-shaped convex blocks to avoid sound gathering, and the bottom plate and the base plate made of metal materials have good fireproof performance and are environment-friendly.

Provided is a cooling system of a low-noise central control system. The cooling system comprises a cooling device for an internal power supply device of the central control system and a cooling device for a processor of the central control system. The cooling device for an internal power supply device of the central control system comprises a fan with radius more than 90mm. The fan is configured on one side facing the processor of the central-control system of the internal power supply device of the central control system. The surface of the fan and surface layers of all blades are coated with sound-insulating material. Microparticles with sound-insulating effect are uniformly distributed in sound-insulating material. An air outlet is arranged in the side wall of the internal power supply device of the central-control system. The cooling system of the low-noise central control system has following beneficial effects: ventilation quantity of the internal power supply device of the central control system is increased; noise of the central control system is decreased; mass production is achieved; and parts are easily replaced.

The invention discloses a car drum test soundproof room, comprising a work room internally provided with a drum test bench, wherein two opposite side faces of the work room are respectively provided with a room door, and door panels of the room door are made by adopting PVB sandwich glass; a wall body of the work room is a soundproof wall, and the soundproof wall comprises a perlite sound absorption panel, a vacuum glass layer and a cement and sawdust sound absorption panel which are arranged in sequence from inside to outside; a part between the perlite sound absorption panel and the vacuum glass layer is filled with glass wool, and a part between the vacuum glass layer and the cement and sawdust sound absorption panel is filled with glass wool; the work room is further internally provided with a temperature adjusting device. The invention aims to provide the car drum test soundproof room for solving the problem that greater noise pollution is generated in a workshop in an existing drum test process, and achieving the aim of isolating drum test to reduce noise pollution in the workshop.

The invention relates to the technical field of electric power engineering, in particular to a fire protection and noise reduction device of an indoor transformer substation. The fire protection and noise reduction device comprises a transformer room which is provided with an opening in the top, and a fire-fighting noise reduction box which covers the top of the transformer room; a transformer isarranged in the transformer room; the interior of the fire-fighting noise reduction box is divided into a plurality of cavities arranged side by side, and the cavities comprise the noise reduction cavity and the fire-fighting cavity; a noise reduction film sheet is arranged in the noise reduction cavity, and a sound radiation inlet hole used for being communicated with the interior of the transformer room is formed in the bottom of the noise reduction cavity; and a transmission mechanism used for driving the fire-fighting noise reduction box to fall off from the top of the transformer room isarranged in the fire-fighting cavity, and a smoke sensing hole used for being communicated with the interior of the transformer chamber is formed in the bottom of the fire-fighting cavity. Compared with the prior art, the device provided by the invention can simultaneously realize fire protection and noise reduction functions.