7314 results about "Acoustic insulation" patented technology

The invention discloses a high-impact-resistant thermoplastic composite material bottom protection plate which comprises a lower surface layer, a first high-impact-resistant layer, a sound insulation and heat preservation layer and an upper surface layer which are sequentially bonded through adhesive films from bottom to top, and the upper surface layer and the lower surface layer are both made of multiple layers of continuous fiber reinforced thermoplastic composite materials. And the first high-impact-resistant layer is made of an ultra-high molecular weight polyethylene material. Metal plates are not needed, the weather resistance of the metal plates does not need to be considered, machining is convenient, and continuous production can be achieved; compared with a bottom protection plate with a metal plate, the weight is reduced by 30-60%, the sound insulation and heat insulation performance is improved, and the gain effect is provided for battery heat preservation and automobile body noise reduction.

The invention discloses sound-insulation and heat-insulation building mortar and a preparation method thereof, and relates to the technical field of building materials, the sound-insulation and heat-insulation building mortar comprises, by weight, 42-48 parts of a cementing material, 15-25 parts of an auxiliary material, 17-22 parts of lightweight aggregate, 30-35 parts of a functional filler, and 1-2 parts of an additive; the cementing material is a mixture of sulphoaluminate cement and Portland cement; the auxiliary material is a mixture of fly ash and quartz sand, the lightweight aggregate is a mixture of 20-40-mesh hollow vitrified microbeads and 70-90-mesh hollow vitrified microbeads, and the mass ratio of the hollow vitrified microbeads to the hollow vitrified microbeads is 1: (2-3); the functional filler is a mixture of modified waste rubber particles and modified fibers; the additive is a mixture of a polycarboxylate superplasticizer and hydroxypropyl methyl cellulose ether. The mortar disclosed by the invention is good in thermal insulation performance and excellent in mechanical property, the method disclosed by the invention is simple to operate and low in cost, and the prepared mortar is excellent in performance.

The invention relates to the field of building materials, and discloses a multifunctional foamed ceramic sound insulation and heat preservation material for buildings. Comprising the following raw materials in parts by weight: 42 to 48 parts of pottery clay tailings, 14 to 16 parts of fly ash, 10.5 to 12 parts of crushed stone materials, 2.8 to 3.2 parts of a silicon carbide foaming agent, 0.7 to 0.8 part of a borax fluxing agent, 7 to 8 parts of paraffin / silicon dioxide phase change microcapsules, 0.5 to 1.0 part of graphene, 2.0 to 2.5 parts of nano iron powder, 0.05 to 0.5 part of nano silver, 1.0 to 1.5 parts of photocatalytic titanium dioxide and 0.3 to 0.4 part of a fluorosilane coupling agent. A stable matrix structure is constructed through the argil tailings, the fly ash and the crushed stone materials, the silicon carbide foaming agent and the borax fluxing agent reduce the heat conductivity coefficient, the sound insulation performance is improved, the material is endowed with the antibacterial ability through nano-silver and photocatalytic titanium dioxide, indoor sanitation is guaranteed, and a super-hydrophobic layer is constructed through the fluorosilane coupling agent.

The invention relates to a modified polyurethane elastomer and application of the modified polyurethane elastomer in preparation of bimodal cellular structure foam, and belongs to the technical field of foam forming. The invention provides a modified polyurethane elastomer. The modified polyurethane elastomer comprises the following components: a thermoplastic polyurethane elastomer, a polyisocyanate-based chain extender and an antioxidant component, in the modified polyurethane elastomer, the mass ratio of the thermoplastic polyurethane elastomer to the polyisocyanate chain extender to the antioxidant component is 1: (0.01-3): (0.05-1). According to the modified polyurethane elastomer, non-uniform chain extension modification is carried out on the thermoplastic polyurethane elastomer by introducing an insufficient amount of a polyisocyanate group chain extender, and the thermoplastic polyurethane elastomer foam obtained by foaming the modified polyurethane elastomer has a bimodal (big and small holes) foam structure; and the material has various excellent performances of light weight, heat insulation, sound insulation, buffering, high resilience and the like.

The invention relates to the technical field of active noise reduction of ventilation pipelines, in particular to an active noise reduction ventilation device and method powered by solar energy. The active noise reduction assembly comprises a noise acquisition assembly, a noise reduction controller and a noise reduction microphone; the passive noise reduction assembly comprises a fan and blades; the control mechanism comprises a rotating shaft, a solar assembly and a sound insulation layer, the passive noise reduction state and the active noise reduction state of the fan are automatically adjusted through the rotating shaft according to the air inlet amount of the ventilation pipeline, and the control mechanism adapts to various application scenes, does not need manual switching, is simple and convenient, automatically adjusts the air inlet amount of the filter screen and assists in scraping dust filtered by the surface layer of the sound insulation layer. The motion state of the rotating shaft is automatically adjusted according to the air inlet amount and the wind noise, meanwhile, solar assembly power generation and wind power generation of the fan are switched, and normal work of the active noise reduction assembly is guaranteed.

The invention relates to the technical field of composite materials, in particular to a heat and sound insulation PVB intermediate film and a preparation method thereof. The problem that a PVB intermediate film is insufficient in heat insulation and aging resistance is solved. The preparation method comprises the following steps: pre-plasticizing PVB resin, shearing and mixing the pre-plasticized PVB resin and silane coupling agent modified enhanced nano cellulose, sequentially adding additives such as a plasticizer, molybdenum trioxide loaded lanthanum hexaboride, a composite light stabilizer and modified cerium oxide, and carrying out tape casting and hot pressing treatment to obtain the PVB intermediate film. Wherein the modified lanthanum hexaboride enhances infrared ray shielding, the composite light stabilizer and the modified cerium oxide synergistically improve the aging resistance, all the components are subjected to substance cooperation and process cooperation, comprehensive improvement of heat insulation, sound insulation and aging resistance of the PVB intermediate film is achieved, and the PVB intermediate film is suitable for the field of high-strength building glass.

The invention provides a thermoplastic resin composition as well as a preparation method and application thereof. The thermoplastic resin composition is prepared from the following components in parts by weight: 10 to 40 parts of acrylonitrile-butadiene-styrene resin material, 30 to 70 parts of polymethyl methacrylate, 1 to 10 parts of modified hollow ceramic microbeads and 1 to 20 parts of toughening agent, the modified hollow ceramic microbeads comprise hollow ceramic microbeads modified by a coupling agent and stearate. The thermoplastic resin composition disclosed by the invention has the advantages of excellent wear resistance, good sound insulation effect and high surface hardness and impact strength.

The utility model relates to a soundproof cover, a soundproof cover assembly and an energy storage cabinet, the soundproof cover comprises a cover body and at least one separator, the cover body is internally provided with a cavity, a first opening and a second opening, the first opening and the second opening are communicated with the cavity, the at least one separator is arranged in the cavity and divides the cavity into a plurality of sub-runners, one end of each sub-runner is communicated with the first opening, and the other end of each sub-runner is communicated with the second opening. The cover body is provided with a first arrangement area, the first arrangement area is located on the cavity wall of the cavity, and / or the first arrangement area is arranged in the cover body and communicated with the cavity, the partition piece is provided with a second arrangement area, the second arrangement area is located on the outer surface of the partition piece, and / or the second arrangement area is located on the outer surface of the partition piece. The second arrangement area is arranged in the partition piece and communicates with the cavity, and the first arrangement area and the second arrangement area are both used for arranging the noise reduction piece. Thus, the noise reduction part can make contact with airflow in the flow channel and absorb sound waves (medium-high-low-frequency sound waves) of the airflow, the noise reduction effect is achieved accordingly, the contact area of the airflow and the noise reduction part is large, and the noise reduction effect of the sound insulation cover is improved.

The artificial intelligent fireproof smoke exhaust window comprises a ventilation window body, a window sash is arranged on the right side of the ventilation window body, fireproof sound insulation glass is installed in the window sash, the bottom end of the window sash is hinged to the bottom end of the right side of the ventilation window body, and a driving assembly is arranged between the window sash and the ventilation window body; a smoke exhaust assembly used for exhausting smoke outwards is arranged between the upper end of the ventilation window and the window sash. The driving assembly and the smoke exhaust assembly are arranged between the ventilation window and the window sash, the smoke alarm, the temperature sensor and the equipment box are arranged on the right side of the ventilation window, the equipment box can receive signals transmitted by the smoke alarm and control the electric telescopic rod to be started, and the electric telescopic rod drives the window sash to be opened; and meanwhile, in the opening process of the window sash, a T-shaped groove, a T-shaped block and a guide block can drive a movable plate to be overturned and opened, so that a fan corresponds to an exhaust channel, the fan exhausts smoke, the smoke exhaust effect is improved, and safety accidents are avoided.

The invention provides a sound insulation coating, sound insulation glass and a preparation method thereof. The sound insulation coating comprises the following components in percentage by weight: 15%-35% of a high-molecular polymer, 3%-12% of an inorganic filler, 1%-10% of a cellulose dispersion liquid, 55%-70% of a solvent, 0.1%-1% of an auxiliary agent and 0.5%-1% of a coupling agent, wherein the inorganic filler comprises a hollow inorganic filler; the cellulose dispersion liquid comprises bacterial cellulose dispersion liquid and / or cellulose nanofiber dispersion liquid. The invention further provides sound insulation glass which is provided with a sound insulation coating formed by the sound insulation coating. The sound insulation coating provided by the invention has the advantages of light weight, good sound insulation, good weather resistance and the like, so that the sound insulation coating is suitable for sound absorption and noise reduction of vehicle glass such as automobile glass.

A wiring module includes: a functional sheet disposed between a roof panel forming a roof part of a vehicle and an interior member forming a ceiling shape of a vehicle interior to planarly extend over the roof panel and the interior member; a transmission member provided to the functional sheet; a roof-side apparatus provided to the functional sheet; and a rigid member provided to the functional sheet, wherein the functional sheet includes a layer having at least one selected from the group consisting of a heat insulation function, an acoustic insulation function, and a radio wave shielding function, and at least one end of the transmission member is provided along a wiring route connected to the roof-side apparatus in the functional sheet.

The invention relates to the technical field, in particular to an ultralight foamed ceramic hollow sphere prepared from iron lepidolite tailings and a preparation method and application of the ultralight foamed ceramic hollow sphere. The foamed ceramic hollow sphere is prepared from the following raw materials: iron lepidolite tailings, silicon carbide, bentonite, sodium carbonate and potassium carbonate; in percentage by mass, the content of the iron lepidolite tailings is 90 to 96.4 percent; the content of the silicon carbide is 0.1-1%; the iron lepidolite tailings are prepared from the following components in percentage by mass: 77 to 80 percent of SiO2, 10 to 13 percent of Al2O3, 1.3 to 1.6 percent of Fe2O3 and 0.1 to 0.17 percent of Li2O. The ultralight foamed ceramic hollow sphere is prepared by using the iron lepidolite tailings, the silicon carbide, the bentonite, the sodium carbonate and the potassium carbonate as raw materials, can meet various market requirements of heat preservation, heat insulation, sound insulation, noise reduction and the like, and brings remarkable economic benefits and social benefits.

The invention discloses a high-weatherability sound insulation wood plastic wallboard and a preparation method thereof, the high-weatherability sound insulation wood plastic wallboard comprises the following raw materials by weight: 30-40 parts of wood flour or plant fiber, 25-35 parts of a sound insulation functional filler, 35-45 parts of high density polyethylene, 2-2.5 parts of maleic anhydride grafted high density polyethylene, 1-1.5 parts of stearic acid, 3-4.5 parts of a weatherability auxiliary agent, and 1-1.5 parts of azodicarbonamide. The problems of cracking, deformation and the like caused by moisture absorption expansion are relieved by optimizing the proportion and compatibility of the wood flour and the plastic, and then the problems of weather resistance and sound insulation of the wallboard outdoors are solved by filling the porous sound absorption material.

The invention provides a box body structure and a hybrid power integrated system comprising the same, and the box body structure is characterized in that a box body space is divided into a hot space area and a cold space area, and high-temperature equipment is placed in the hot space area; equipment with low temperature (low heat productivity) can be placed in the cold space area, heat isolation can be guaranteed through the heat insulation layer, high temperature of the hot space area is prevented from being conducted to the cold space area, the environment temperature of the cold space area is prevented from being affected, and the low-temperature equipment such as a motor placed in the cold space area is further prevented from being affected. The material of the box body is preferably a heat dissipation or heat conduction material; the surface of each wall plate of the box body can be provided with structures such as heat dissipation teeth or heat dissipation grids, so that the heat dissipation area is increased, the strength of the box body is improved, and the weight of the box body is reduced. Sound insulation and / or heat transfer materials are further arranged on the inner side walls of the wall plates of the box body, and sound insulation and heat transfer materials are also arranged at the air inlets and the air outlets of all the heat spaces, so that sound insulation and heat dissipation are facilitated.

A microphone assembly for exterior use on vehicles having a housing base including at least one compartment, a PCBA (printed circuit board assembly) with at least one acoustic membrane, a sealing cover to at least partially overlap with the compartment is disclosed. The sealing cover has at least one opening with said opening at least partially aligned with said acoustic membrane. The assembly has a housing cover including a first grid at least partially aligned with said opening in the sealing cover, and a shielding cover. The shielding cover has a second grid at least partially aligned with said opening in the sealing cover. The first grid and the second grid are aligned in offset in order to provide a labyrinth path without straight passthrough passages from the exterior of the microphone assembly to the acoustic membrane.

The utility model relates to a modular building connecting node easy to assemble, which comprises a plurality of modules needing to be assembled mutually and connecting components used for connecting the modules, a box type node connecting box is arranged on the splicing corner of each module, bolt holes and positioning holes are respectively arranged on the splicing surface of the node connecting box, and the bolt holes and the positioning holes are connected with the connecting components. The other face of the node connecting box is further provided with an operation opening penetrating through an inner cavity of the node connecting box. The connecting assembly comprises a connecting plate and a positioning insertion block, a bolt hole and a positioning hole are formed in the connecting plate, and the positioning insertion block is inserted into the positioning hole of the connecting plate; connecting assemblies are arranged between the mutually-spliced modules, the two ends of the positioning inserting blocks are embedded into positioning holes of the joint connecting boxes on the mutually-spliced modules respectively, and the connecting plates and the mutually-spliced modules are fixedly connected through high-strength bolts. The module has the advantages that the module is convenient to hoist and align and easy to assemble, the assembling efficiency of a modular building can be improved, and a good sound insulation effect can be achieved.

The invention relates to a recyclable nuclear pore structure MOF nanometer flame retardant and a preparation method thereof, and belongs to the technical field of nanometer and flame retardant crossing. According to the MOF nano flame retardant with the nuclear pore structure, provided by the invention, after polyurethane foam is soaked in the high-concentration nano flame retardant, a foam material does not have a molten drop phenomenon, is self-extinguished after being away from fire and cannot be secondarily ignited, and the foam material shows good flame-retardant and heat-insulating effects and is outstanding in smoke suppression effect. And after being introduced into the foam material, the foam material has improved elasticity, and the nuclear pore structure endows the foam material with higher sound insulation and noise reduction effects.

The utility model discloses an off-axis door assembly, a door frame of the off-axis door assembly and a door leaf of the off-axis door assembly, the off-axis door assembly comprises the door leaf, the door frame and an inflation and deflation component, the door leaf is hinged to the door frame, at least one of the door leaf and the door frame is provided with a first sealing component capable of being inflated and deflated, and the door frame is provided with a second sealing component capable of being inflated and deflated. The inflating and deflating component is connected with the first sealing component, the inflating and deflating component is configured to be capable of inflating or deflating the first sealing component, the first sealing component has a bulging state and a deflated state, and the first sealing component in the bulging state is used for sealing between the door leaf and the door frame. The off-axis door assembly is good in sealing performance, and therefore the off-axis door assembly can have the good sound insulation performance, the good heat insulation performance and the like.

The invention relates to the technical field of motor test equipment, in particular to a high-efficiency noise reduction and shock absorption soundproof box, two supporting and lifting mechanisms are arranged on a machine table, and a test box main body is arranged on the two supporting and lifting mechanisms; a test base is arranged below the test box main body, and the test base can horizontally move on the machine table; a motor test frame is arranged on the test base, the motor test frame is used for placing a motor and electrifying the motor for operation, the support lifting mechanism can lift the test base in parallel, so that the test base and the test box main body form a sound insulation test space, and the running motor completes noise and vibration tests in the sound insulation test space. Compared with the prior art, the high-efficiency noise reduction and shock absorption soundproof box can realize seamless joint with an automatic production line, the test efficiency is improved, the labor can be saved, and the higher automation degree is realized.

The invention discloses a super-strong mute building drainage pipe and a preparation method thereof, and relates to the technical field of high polymer materials. Comprising the following raw materials in parts by mass: 100 parts of high-density polyethylene, 5-7 parts of a cold-resistant toughening agent, 8-12 parts of a synergist, 8-10 parts of a sound insulation filler and 0.3-0.5 part of an antioxidant. By introducing the synergist prepared from the components such as polyamine polyether methylene phosphonic acid, zinc nitrate hexahydrate, magnesium nitrate hexahydrate and the like, the sound insulation, flame retardance and smoke suppression capabilities of the drainage pipe can be effectively improved; by introducing the sound insulation filler prepared from the modified halloysite nanotubes, hydroxyl-terminated polydimethylsiloxane, aziridine cross-linking agent and the like, the sound insulation, flame retardance and smoke suppression capabilities of the drain pipe are further improved. Therefore, the drainage pipe prepared by the invention has a wider application prospect.

The invention belongs to the technical field of court ground materials, and particularly relates to a ground material of a ground throw court and a preparation method thereof. The ground material of the ground throwing field comprises the anti-skid surface layer, the elastic buffer layer and the sound insulation layer from top to bottom, and has excellent sound insulation, impact resistance and wear resistance. The polyvinyl butyral bonded acrylic sound insulation felt and the jute fiber board are used as a sound insulation felt composite material to be laid on the surface of the base layer, so that the sound insulation effect of the ground of the ground throwing field is enhanced, boric acid and phenylboronic acid are compounded to react with siloxane, and reinforced gel prepared by adding a reinforcing material has excellent shear hardening and thermal stability, so that the sound insulation effect of the ground of the ground throwing field is improved. An elastic reinforcing material is prepared by compounding alkali-treated straw fibers and a reinforcing body prepared by compounding the alkali-treated straw fibers and a hydrophobically modified sponge framework, and has remarkable creep resistance and excellent impact hardenability, and the esterified straw fibers prepared by reacting the alkali-treated straw fibers with citric acid are used as a toughening agent to be added into wear-resistant elastic microspheres prepared by rubber, so that the wear-resistant performance of the wear-resistant elastic microspheres is greatly improved. The material has excellent wear resistance, light weight and aging resistance.

The invention discloses a PVC (polyvinyl chloride) board with heat insulation, sound insulation and heat preservation functions. The PVC board is prepared from the following raw materials in parts by weight: 100 parts of PVC resin powder, 10-23 parts of plasticizer, 2.5-6 parts of stabilizer, 1-3 parts of barite powder, 4-15 parts of maleic anhydride grafted polypropylene and 3.5-10 parts of composite filler. The PVC board provided by the invention not only has excellent heat insulation and sound insulation properties, but also has good anti-aging and antistatic properties, and is high in mechanical strength and good in flame retardant property. The composite filler provided by the invention can significantly improve the heat insulation performance, sound insulation performance, flame retardant performance and aging resistance of PVC, also can ensure the mechanical strength of PVC, and can endow the PVC with good antistatic performance; the PVC board is endowed with excellent ultraviolet aging resistance and thermo-oxidative aging resistance through the composite filler, so that the PVC board can be better applied to an outdoor environment; the antistatic performance is endowed, so that the application scene can be widened.

The invention provides an in-vehicle noise optimization method and device, equipment and a medium. The method comprises the steps that at least one acoustic package strategy for an electric drive assembly of the vehicle is obtained; on the basis of a virtual acoustic environment created for the electric drive assembly in advance, the sound insulation amount of all the acoustic package strategies for noise generated by the electric drive assembly is determined; according to the data of each acoustic packet strategy on each of at least one preset dimension, determining a target acoustic packet strategy in the at least one acoustic packet strategy, the at least one preset dimension comprising the sound insulation amount; and according to the target acoustic package strategy, performing sound insulation treatment on the electric drive assembly. According to the method and the device, the acoustic package optimization based on the electric drive assembly can be quickly realized under the condition of shortage of resources and periods in the early stage of a project, the efficiency of in-vehicle noise optimization is remarkably improved, and the cost of in-vehicle noise optimization can be remarkably reduced.

The utility model provides a noise reduction and sound insulation assembly convenient to replace, relates to the technical field of sound insulation plates, and solves the problems that when the noise reduction and sound insulation assembly is applied to some temporary noise reduction and sound insulation positions, the noise reduction and sound insulation assembly often needs to be disassembled and assembled for multiple times, but the noise reduction and sound insulation assembly is inconvenient to replace after being disassembled for multiple times. The noise reduction and sound insulation assemblies collide with one another, so that sound insulation parts of the noise reduction and sound insulation assemblies are damaged, and the service life of the noise reduction and sound insulation assemblies is affected. The noise reduction and sound insulation assembly convenient to replace is characterized in that a connecting frame is mounted at the top of a protective frame; through the arrangement of a protective layer and a barrier layer, the noise reduction and sound insulation assembly is protected through the cooperation of the protective layer and the barrier layer, and when the protective layer and the barrier layer are excessively damaged and cannot be normally used, a fixed insertion block top plate can be separated from a fixed insertion groove, so that the limitation of a connecting frame is relieved, and the protective layer and the barrier layer on the connecting frame are replaced; therefore, the noise reduction and sound insulation assembly can be repeatedly used, and the service life is effectively prolonged.

The present invention discloses a household soundproof ceiling for soundproofing a roof, wherein a connecting component is installed on one side of a load-bearing keel, an installation groove is opened on one side of the load-bearing keel, a light steel keel is installed on the inner side of the installation groove, fixing columns are welded on both sides of an I-shaped plate, a torsion spring is welded on one side of the fixing column, an L-shaped rotating plate is installed on one side of the fixing column, a clamping plate is installed on one side of the L-shaped rotating plate, a limiting strip is welded on the top of the clamping plate, an auxiliary handle is fixedly installed on the middle part of the top of the L-shaped rotating plate, the load-bearing keel and the light steel keel are clamped and limited by the L-shaped rotation, the clamping plate and the limiting strip, thereby ensuring that the position of the light steel keel will not be offset when the light steel keel and the load-bearing keel are clamped and installed with each other, and further strengthening the connection stability between the load-bearing keel and the light steel keel, thereby ensuring that the keel is convenient to install while ensuring its stability and fixity.

The invention provides a sound-insulation porous ceramic tile and a preparation method thereof, and belongs to the field of building materials. The sound-insulation porous ceramic tile is prepared from the following raw materials: 20 to 30 parts of kaolin, 18 to 22 parts of quartz sand, 12 to 18 parts of potassium feldspar, 3 to 7 parts of talcum powder, 3 to 7 parts of silicon carbide powder, 2 to 4 parts of ferrosilicon alloy powder, 0.5 to 1.5 parts of sodium bicarbonate, 3 to 5 parts of hollow glass beads, 1 to 3 parts of zirconium oxide microspheres, 1 to 3 parts of silicon dioxide aerogel particles, 3 to 5 parts of acrylate emulsion, 1 to 3 parts of butadiene styrene rubber emulsion, 0.5 to 1.5 parts of polyvinyl alcohol solution and 1 to 2 parts of polyurethane dispersion. The composite material comprises the following components in parts by weight: 30-60 parts of polypropylene, 0.3-0.7 part of a dispersing agent, 0.2-0.4 part of a defoaming agent, 0.8-1.6 parts of reinforced fibers and 9-13 parts of deionized water. The raw materials of the porous ceramic tile are reasonably designed, the sound insulation performance of the porous ceramic tile is improved, and full-band efficient sound insulation is achieved.

The utility model relates to the technical field of electrical control boxes, in particular to an explosion-proof marine electrical control box which comprises a box body, the box body comprises an outer coating layer, an inner coating layer, an outer stainless steel plate, an inner stainless steel plate, a sound insulation cotton layer, a heat preservation plate layer and a screen plate, the sound insulation cotton layer is arranged on the outer side of the screen plate, and the outer stainless steel plate is arranged on the outer side of the sound insulation cotton layer. An outer coating layer is arranged on the outer side of the outer stainless steel plate, a heat preservation plate layer is arranged on the inner side of the screen plate, an inner stainless steel plate is arranged on the inner side of the heat preservation plate layer, and an inner coating layer is arranged on the inner side of the inner stainless steel plate. The utility model has the functions of sound insulation, noise reduction, heat preservation and moisture prevention, retains the original stainless steel plate design, designs the outer stainless steel plate and the inner stainless steel plate to play the roles of impact protection and supporting plasticity, coats the inner coating layer and the outer coating layer to realize the functions of insulation and moisture prevention, integrates the whole box body, reduces the thickness of the used stainless steel plate, and reduces the cost. The overall weight is reduced, the explosion-proof effect is better, and the moisture-proof effect is achieved from the two aspects of water insulation and heat preservation.

The invention relates to a multi-layer sound absorption and insulation material and a preparation method thereof.The multi-layer sound absorption and insulation material comprises an inner micropore sound absorption layer, a vibration attenuation damping layer, a sound insulation plate layer, a main frame layer, a sound absorption material layer and an outer steel plate layer which are sequentially arranged from inside to outside, a plurality of hollow glass balls are evenly arranged in the main frame layer, and the sound absorption material layer is obtained by pressing multiple layers of composite sound materials; the composite acoustic material comprises the following raw materials in parts by weight: 10-15 parts of fibers, 4-8 parts of an adhesive, 3-8 parts of a foaming agent, 1-3 parts of a flame retardant, 10-20 parts of a plasticizer, 10-20 parts of resin, 1-3 parts of a lubricant, 5-10 parts of an organic sound absorber and 1-5 parts of an antioxidant. According to the sound absorption and insulation material, the inner micropore sound absorption layer, the vibration reduction damping layer, the sound insulation plate layer and other multi-layer structures are arranged from inside to outside, all the layers have a synergistic effect, sound wave propagation can be dealt with from multiple aspects, and the sound absorption and insulation material is suitable for various places with requirements for the acoustic environment, such as the fields of building sound insulation, industrial equipment noise reduction and the like.

The invention discloses a sound barrier defect detection method and device, electronic equipment and a storage medium, and the method comprises the steps: collecting a sound barrier image through an unmanned aerial vehicle, marking a structure and defects of the sound barrier image, constructing a sound barrier detection data set, and designing a detection model comprising a multiple attention mechanism module, the model may be trained based on the detection data set. The sound barrier defect detection method based on the model comprises the following steps: inputting a target image of the sound barrier into the detection model to obtain an initial feature map; weighting the initial feature map based on the channel attention branch and the space attention branch to obtain a channel weighted feature map and a space weighted feature map, and splicing the channel weighted feature map and the space weighted feature map to obtain a target feature map; and determining a defect position of the soundproof barrier based on the target feature map. Therefore, the perceptivity of the model to the color and the structure of the defect is improved through two branches of the channel and the space contained in the multiple attention mechanism, so that the accuracy of defect detection is improved.

A method for forming an acoustic panel assembly for an aircraft propulsion system is provided that includes: forming a plurality of cell rows of an acoustic core by, for each cell row of the plurality of cell rows, cutting and folding a sheet to form each cell row with a plurality of cells, and each cell includes a first transverse panel, first and second longitudinal panels and an oblique panel, and the first and second longitudinal panels extend transversely from the first transverse panel; positioning the cell rows on an inner skin extending circumferentially about an axial centerline; attaching the longitudinal panels of a cell to the oblique panel of that cell, and attaching each cell row of the plurality of cell rows to at least one other cell row to form the acoustic core.