41results about How to "Improved sound insulation" patented technology

The invention discloses a vehicle-used slowly-springback polyurethane foam composite material which is compounded from slowly-springback polyurethane foam and an ethylene-vinyl acetate copolymer. The slowly-springback polyurethane foam is prepared from following components including, by weight, an A material: 40-80 parts of a polyether polyol 1421, 5-40 parts of a polyether polyol 2000D, 5-40 parts of a polyether polyol POP-36 / 28, 0.5-5 parts of diethanolamine, 1-6 parts of water, 0.1-1.5 parts of a catalyst EF-600, 0.1-0.5 parts of a catalyst ZF-10 and 1-6 parts of a silicone oil L-580; a B material: 40-80 parts of a modified MDI. During preparation of the slowly-springback polyurethane foam, a weight usage amount ratio of the A material to the B material is 100:40-80. The vehicle-used slowly-springback polyurethane foam is high in reaction activity, is low in toxicity, is environmental-protective, is high in damp loss factor, is high in sound-insulation performance and is free of addition of a foam-forming agent.

The invention discloses a porous material-pored corrugated compound light multifunctional sandwich panel and a preparation method. The method comprises the following steps: successively welding a pored metal sheet, a pored corrugated sandwich structure and an unperforated metal sheet; filling an opening porous material into a space formed between the pored corrugated sandwich structure and the unperforated metal sheet; compounding the opening porous material and a pored corrugated sandwich panel. Compared with the single narrow band sound absorption or sound insulation property of the other traditional acoustic structure, the structure disclosed by the invention is capable of simultaneously realizing the sound absorption and sound insulation properties in low frequency and wide frequency. Due to the excellent mechanical properties, such as, specific stiffness, strength and shock resistance, of the sandwich panel, the structure disclosed by the invention is an ultra-light multifunctional structure with excellent acoustical and mechanical properties and has significant application prospect in the engineering field.

The invention discloses a middle-low frequency sound insulation and heat insulation composite wall plate which comprises a shell, a heat insulation and sound absorption layer and a combined plate which are connected with one another in sequence from outside to inside, wherein the combined plate consists of two first coupling vibration plates and a first sound absorption material arranged between the two first coupling vibration plates. To solve the problem that the conventional light-weight and thin sound insulation material cannot effectively insulate middle-low frequency noise, the middle-low frequency sound insulation and heat insulation composite wall plate adopts the coupling vibration plates, so that near field waves produced by the coupling vibration plates can repeatedly penetrate through the sound absorption material, and a large amount of sound energy is consumed; by virtue of the arrangement of distances between the coupling vibration plates and the shell, the performance of a sound insulation spectrum curve near to peaks and valleys can be improved; therefore, the middle-low frequency sound insulation and heat insulation composite wall plate has a better sound insulation effect in the whole middle-low frequency region; furthermore, under a condition that only the shell exists near to the peak frequency of a sound insulation amount, the sound insulation amount can be increased by about 25dB. The quality areal density of the middle-low frequency sound insulation and heat insulation composite wall plate is about 5.5kg / m<2>, so that the middle-low frequency sound insulation and heat insulation composite wall plate is suitable for being used as cabin wall plates of an airplane, a high-speed train and the like.

The invention relates to an autoclaved aerated concrete slab containing carbon fibers and an application thereof. The prior precast slabs have large specific gravity, resulting in high weight of buildings and very high cost of foundations. The autoclaved aerated concrete has low specific gravity but poor strength, so as not to be used as supporting parts. The inventive product comprises building concrete structural slabs (1), wherein the concrete is autoclaved aerated concrete, and the concrete in the structural slabs is provided with carbon fibers (2). The product can be used as precast elements for buildings, such as floor slabs, roof slabs and wall slabs, etc.

The invention discloses a slab structure optimal design method for improving low-frequency sound insulation performance. The method comprises the steps that a calculation equation suitable for sound transmission loss of a slab structure under arbitrary boundary conditions is established, and all known parameters are set; one or more structure low-frequency sound insulation performance evaluation indexes are selected; a calculation method corresponding to the selected indexes is established; an optimization objective of the slab structure is set according to the selected indexes; if the numberof the selected indexes in the step 4 is more than 1, corresponding weights of all the indexes are set; an optimization algorithm is selected; and optimal solution search is performed according to theset known parameters, a boundary parameter adjustable range and the optimization objective to obtain optimal boundary parameters and form the slab structure. The method can guide optimal design of the boundary conditions of the slab structure, the advantages of the optimization algorithm are utilized in the design process, an optimal solution to the boundary conditions is quickly searched out, and therefore the effect of maximizing the low-frequency sound insulation performance of the slab structure is achieved.

The invention relates to a layered composite light acoustical material for a rail train. The rail train adopts a multilayer structure which consists of an aluminum rail train aluminium section, an inner wall plate, and a heat preservation and flame retardant material between the aluminum rail train aluminium section and the inner wall plate. The layered composite light acoustical material is characterized by being arranged between the aluminum rail train aluminium section and the inner wall plate, wherein the acoustical material at least comprises a latticed rubber framework material layer. The layered composite light acoustical material also comprises a porous material layer or / and a damping layer. The layered composite light acoustical material and the inner wall plate are in an integrated structure. On the basis of an original heat preservation and flame retardant material applied to a carriage of a high-speed train, the novel composite material has the advantages that the properties of sound absorption, sound insulation and vibration reduction are good, and at the same time, less space in the carriage is occupied.

The invention discloses a PVC (polyvinyl chloride) carpet for a high-sound-insulation vehicle and a preparation method thereof. The PVC carpet for the high-sound-insulation vehicle is prepared by processing five layers of materials in a combined way and is in a five-layer structure including an upper anti-skidding layer, an upper sound insulation layer, a foaming layer, a lower sound insulation layer and a lower anti-skidding layer in sequence from a surface layer to a bottom layer, and all the layers are made of PVC materials with excellent fire resistance and sound insulation performance. The thickness, the density and the rigidity of all of the layers are selected and determined in accordance with vehicle noise spectrum characteristics. All of the layers are bonded through hot pressing, so as to form a sheet in a multi-layer constraint structure, and then the carpet used for the vehicle is manufactured through thermoforming and used in a vehicle cab. The carpet manufactured by using the method has good sound insulation performance, the sound insulation performance of the carpet can be regulated by utilizing the thickness, the density and the rigidity of all of the layers, the cab noise is reduced, and the acoustical quality of the vehicle cab is increased.

The invention relates to a soundproof wood-plastic composite material and a preparation method thereof and aims to solve the problem of lack of a soundproof function of existing soundproof wood-plastic composite materials. The soundproof wood-plastic composite material comprises a core wood-plastic layer and surface wood veneer layers on two sides. The preparation method includes: firstly, granulation; secondly, preparation of microsphere wood-plastic composite plates; thirdly, preparation of the soundproof wood-plastic composite material. The soundproof performance of the soundproof wood-plastic composite material prepared according to the method is improved greatly under each frequency band, sound reduction index reaches 39.659dB maximally when 10 parts of hollow glass microspheres are added, and accordingly the soundproof performance of the material is effectively improved. The soundproof wood-plastic composite material is applied to the field of wood-plastic composite materials.

The invention relates to a composite structure of autoclaved aerated concrete and reinforced concrete and an application thereof. The prior precast slabs have large specific gravity, resulting in high weight of buildings and very high cost of foundations. The autoclaved aerated concrete has low specific gravity but poor strength, so as not to be used as supporting parts. The inventive product comprises a building concrete structure member (1) containing reinforced steel bars, wherein the low stress part at the middle of the concrete structure member uses autoclaved aerated concrete (2). The product can be used as precast elements for buildings, such as floor slabs and roof slabs, etc.

The invention provides a preparation method of a graphene / furfuryl alcohol resin impregnated and modified poplar veneer for sound insulation. The preparation method comprises the following steps: 1) preparation, including delignification pretreatment of a poplar veneer and preparation of a graphene / furfuryl alcohol resin impregnation liquid, wherein in the delignification pretreatment of the poplar veneer, the poplar veneer is delignified by adopting a sodium chlorite method; 2) impregnation of the poplar veneer with the graphene / furfuryl alcohol resin: impregnating the poplar veneer into the graphene / furfuryl alcohol resin impregnation liquid, pressing the top by using a heavy object, and carrying out impregnation at normal temperature and normal pressure until the poplar veneer is permeated by the impregnation liquid after vacuum pressurization impregnation; and 3) drying until the weight of the poplar veneer does not change any more to obtain the graphene / furfuryl alcohol resin impregnated and modified poplar veneer. According to a designed preparation process in the invention, the modified poplar veneer with the best sound insulation performance can be obtained, a small amount of graphene oxide is added, and high-frequency-band average sound insulation index can be increased by 10%-50%; and compared with raw materials, the high-frequency-band average sound insulation index is increased by 77% through the designed preparation process.

The invention discloses a carbon fiber composite vehicle body structure and a design method thereof, and the method comprises the steps: taking a design space, a non-design space, a constraint condition, a calculation condition and an optimization target as the input of simulation software, and creating a vehicle body topological optimization structure model; and performing iterative calculation on the vehicle body topological optimization structure model by using a variable density method to obtain a vehicle body structure force transmission path meeting constraint conditions and working condition requirements under different material utilization degrees, and obtaining an optimal vehicle body structure configuration according to the force transmission path. The design method of the input parameters is given, it is ensured that the needed structural configuration can be obtained, and the simulation efficiency and the simulation precision are improved.

The invention relates to a movable silent generator room. The movable silent generator room comprises a movable room body, wherein the movable room body comprises a base, side walls and a roof; the side walls comprise a shutter and corrugated board wall bodies; sound absorbing and insulating boards are arranged on the inner sides of the corrugated board wall bodies and the inner side of the roof; a generator is placed in the movable room body; a silent grille is arranged between the generator and the shutter in the movable room body. The sound absorbing and insulating boards disclosed by the invention are formed by splicing modular sound absorbing and insulating modules, so that the sound absorbing and insulating boards are firm in structure, allow sound waves to easily pass through and facilitate noise absorption by sound absorbing and insulating materials; in addition, the sound-absorbing and insulating materials are formed by laminating glass wool and cement-fiber boards with different sound absorbing and insulating coefficients layer by layer, thereby fully absorbing noises with different wavelengths and being better in noise removing efficiency; the outsides of the sound absorbing and insulating materials are wrapped with glass fiber cloth or non-woven fabric, so air between every two layers of sound absorbing and insulating materials can be effectively extruded, and the condition that the noises are leaked without absorption is prevented.

The invention discloses a sound insulation plate-frame integrated floor plate structure and a production method thereof. The sound insulation plate-frame integrated floor plate structure comprises steel skeletons and a concrete layer, wherein the part between the steel skeletons is filled with the concrete layer, wherein the concrete layer sequentially comprises a decorating layer with the thickness being 5-15 mm, a fine aggregate concrete layer with the thickness being 30-50 mm, a foaming cement layer with the thickness being 100-140 mm, a foaming ceramic material layer with the thickness being 5-15 mm, and a cement mortar protecting layer with the thickness being 6-20 mm; and a sound insulation layer the thickness being 40-50 mm is arranged inside the foaming cement layer. The sound insulation layer comprises two building plates and a polymer damping material located between the two building plates. The sound insulation property of the sound insulation plate-frame integrated floor plate structure is significantly improved, meanwhile, the load bearing capability is greatly improved through the optimized steel skeletons, thus the sound insulation plate-frame integrated floor platestructure can serve as an assembling component of a large building for direct assembling, and a load bearing frame does not need to be prefabricated.

The invention provides a bulkhead sound insulation and thermal insulation composite structure. The bulkhead sound insulation and thermal insulation composite structure comprises a first panel, a firstcellular board, a first perforated board, a thermal insulation material layer, a second perforated board, a second cellular board and a second panel, wherein the first panel, the first cellular board, the first perforated board, the thermal insulation material layer, the second perforated board, the second cellular board and the second panel are sequentially connected in a bonding mode. A resonance sound absorption structure is formed in the composite structure, the sound absorption performance is improved obviously, compared with a traditional bulkhead structure, and the sound absorption performance of the composite structure is improved obviously due to the fact that sound absorption action enables sound waves penetrating through the composite structure to be reduced effectively. Meanwhile, the introduction of a cellular structure plays a role of obstructing heat transmission, the thermal insulation performance of the composite structure is improved, the rigidity of the composite structure is greatly improved, requirements for a supporting structure are greatly relieved, installation and application are facilitated, and the weight of a total structure is reduced. Compared with an existing sound insulation structure, the thermal insulation material layer is additionally arranged in the composite structure, and the thermal insulation performance of the integral structure is greatly improved and the sound insulation performance of the integral structure can be obviously improved at the same time.

The invention discloses a steel-concrete composite beam which comprises H-shaped steel, concrete and a reinforcing mesh disposed in the concrete, wherein the bottom of the concrete is clung with a bottom wing plate of the H-shaped steel; two side faces of the concrete are flush with edges of the bottom wing plate of the H-shaped steel; separation space is formed between the top of the concrete andthe top wing plate of the H-shaped steel; one section of a middle web of the H-shaped steel is embedded in the concrete, and the other section is located in the separation space; and multiple mutually isolated through holes used for passing of rebar are formed in the section, located in the separation space, of the middle web of the H-shaped steel. The steel-concrete composite beam disclosed by the invention has the beneficial effects that a building net height is saved; combined effects of the steel-concrete composite beam are enhanced; bearing force and rigidity of the steel-concrete composite beam are enhanced, so deflection of a horizontal structure can be controlled effectively, and comfort is enhanced; and problems of cracking of internal parting walls are reduced.

The invention relates to a sound insulation structure of an engine cabin and a passenger car using the same. The sound insulation structure of the engine cabin comprises a floor layer and a sound absorbing layer, and a sound insulation layer is arranged between the floor layer and the sound absorbing layer; and the sound insulation layer is internally provided with a sound insulation cavity and / ora damping body. Compared with multiple sound insulation layers pasted in a traditional sound insulation structure, the cavity structure formed in the sound insulation layer can effectively reduce thenoise volume, the damping body arranged in the sound insulation layer can effectively attenuate the structural vibration noise transmitting to a floor by a vehicle body frame, and thus the sound insulation effect of the sound insulation structure of the engine cabin can be greatly improved through the arrangement.

The invention relates to a test method and test system for sound insulation performance of a whole vehicle, and the method comprises the following steps: adjusting a sound source of a reverberation chamber to form a reverberation environment until the sound pressures of all parts of the outer surface of a test sample vehicle are basically equal; in-vehicle sound signals in multiple directions in the test sample vehicle are measured by using a spherical sound array, wherein the spherical sound array is arranged in the test sample vehicle; analyzing according to the in-vehicle sound signal to obtain sound pressure distribution data of the inner surface of the test sample vehicle; and analyzing according to the sound pressure distribution data to obtain weak parts of the sound insulation performance of the whole vehicle. Compared with a traditional test method, the method is simpler and higher in efficiency, the area with the weak sound insulation performance of the vehicle can be pointed out through one-time measurement, the arrangement difficulty is greatly reduced, limitation of the position of the measurement area can be avoided, sound pressure distribution of the inner surface of the whole vehicle is analyzed, and the weak area obtained through final measurement is more accurate; and the weak sound insulation performance area of the whole vehicle can be rapidly measured.

The invention relates to a double sound-insulating earplug, comprising a housing, a fixing structure and a sound-absorbing structure, the fixing structure is a conical rubber ring arranged on the outer wall of the housing, and the housing is horizontally arranged with a cavity The cylindrical shell, the shell includes a multi-layer sound insulation board, the sound insulation board is filled with sound insulation cotton, the present invention has chosen to improve the sound insulation structure, using the sound insulation board and sound insulation cotton for double sound insulation, thereby enhancing The sound insulation effect of the earplugs is improved, and at the same time, a new design for the shell and the fixing structure can improve the user experience at the same time, and there will be no pain during the fixing process.

The invention discloses a thermal insulation mortar and a preparation method thereof. Thethermal insulation mortar comprises 300 to 600 parts of cement, 100 to 250 parts of fine aggregate, 30 to 50 parts of fly ash, 20 to 40 parts of talcum powder, 0.5 to 2 parts of an organosilicon water repellent, 20 to 100 parts of zirconium oxide hollow spheres, 0.2 to 0.6 part of a water retention component, 5 to 10 parts of toner, 1 to 3 parts of transition metal oxide powder, 1 to 4 parts of an aerogel component, 2 to 5 parts of rubber powder and 150 to 300 parts of water. The thermal insulation mortar prepared by the invention is high in compressive strength, low in heat conductivity coefficient, low in water absorption rate and excellent in fireproof performance.

The invention discloses a PVC (polyvinyl chloride) carpet for a high-sound-insulation vehicle and a preparation method thereof. The PVC carpet for the high-sound-insulation vehicle is prepared by processing five layers of materials in a combined way and is in a five-layer structure including an upper anti-skidding layer, an upper sound insulation layer, a foaming layer, a lower sound insulation layer and a lower anti-skidding layer in sequence from a surface layer to a bottom layer, and all the layers are made of PVC materials with excellent fire resistance and sound insulation performance. The thickness, the density and the rigidity of all of the layers are selected and determined in accordance with vehicle noise spectrum characteristics. All of the layers are bonded through hot pressing, so as to form a sheet in a multi-layer constraint structure, and then the carpet used for the vehicle is manufactured through thermoforming and used in a vehicle cab. The carpet manufactured by using the method has good sound insulation performance, the sound insulation performance of the carpet can be regulated by utilizing the thickness, the density and the rigidity of all of the layers, the cab noise is reduced, and the acoustical quality of the vehicle cab is increased.

The invention provides a membrane-type acoustic metamaterial sound absorption and insulation device with perforated plates. The four cavity walls of the sound insulation device are enclosed into a frame wall with a square cross-section. The rear of the frame wall is installed with a perforated plate and the front is installed with The opening frame has a cavity formed in the middle, a film is fixed in the opening frame, a mass block is pasted in the center of the film, the film is circular, and the mass block is a solid cylindrical structure. To solve the problem that the existing thin-film acoustic metamaterials have limited effect on the sound wave in the mid-frequency range, a perforated plate with a perforated plate or a single-membrane acoustic metamaterial with a narrow sound absorption frequency band that is suitable for use in a wide frequency range is proposed. The membrane-type acoustic metamaterial sound absorption and insulation device is used in the design of sound absorption and insulation in ships and other fields to improve people's living environment, and has good engineering application prospects.

The invention discloses a construction material with the effects of sound absorption, sound insulation, heat preservation, anti-condensation, etc., a preparation method and the application thereof. The construction material consists of the following independent constituents: constituent I, constituent II and constituent III; wherein, the constituent I is a water-base interfacial agent; the constituent II mainly consists of the following constituents according to certain weight portion: 55 to 65 portions of plant fiber and 35 to 45 portions of caking agent; the constituent III is a sealing agent. The construction material of the invention is made of wood fiber by chemical treatment and the construction material is sprayed on the base surface of buildings, which has the effects of sound absorption, sound insulation, heat preservation and anti-condensation, fire protection, moulding prevention, etc. The construction material of the invention is completely suitable for being used on a base surface configuration of any building, such as arc form, waveform, etc., and also is suitable on large-scale public places needing sound absorption, sound insulation, heat preservation, anti-condensation, fire protection, etc. such as a gymnasium, a natatorium, an opera house, a cinema, an exhibition center, an airport, tunnel, an industrial factory building, a machinery room, etc.

The invention discloses a structure and a production method of a sound-insulating board frame combined with a floor board. The floor panel structure includes steel frames and concrete layers filled between the steel frames. The concrete layer successively includes a decorative layer with a thickness of 5-15mm, a fine stone concrete layer with a thickness of 30-50mm, a foamed cement layer with a thickness of 100-140mm, a foamed ceramic material layer with a thickness of 5-15mm and a thickness of 6‑20mm cement mortar protective layer; among them, a sound insulation layer with a thickness of 40‑50mm is set inside the foamed cement layer. The sound insulation layer includes two building boards and a polymer damping material located between the two building boards. The sound insulation board frame combined with a floor panel structure of the present invention significantly improves the sound insulation, and at the same time, the optimized steel frame greatly improves the load-bearing capacity, so that it can be directly assembled as an assembly component of a large building without prefabricating a load-bearing frame.

The invention relates to composition glass capable of preventing a sniper rifle bullet, which can be used for preventing smashing and can resist sniper rifle bullet attack. A transparent PC (Poly Carbonate) plate is arranged between two pieces of floating-process glass; two PU (Poly Urethane) films are arranged between the floating-process glass and the transparent PC plate; the two pieces of floating-process glass, the transparent PC (Poly Carbonate) plate, and the two PU films are bonded together by heating and pressurizing to form an anti-smashing transparent composite plate with a smashing prevention performance; a plane parallel overlapped composite structure is arranged between the anti-smashing transparent composite plate and F79 type bullet-proof composite glass; a cavity structure is formed between the anti-smashing transparent composite plate and F79 type bullet-proof glass; the cavity is internally provided with a molecular sieve, a molecular sieve framework and a silicone sealant in sequence from inside to outside; the disadvantages of the prevention capability of the F79 type bullet-proof glass are made up and the complementation between the cavity and the F79 type bullet-proof composite glass is formed; and a whole protection system of a solid transparent protection screen is completed and a barrier which cannot be passed by improper invasion of a person adopting a common mechanical manual tool is formed, so that safe and effective protection guarantees are provided for antiriot terrorist attacks.

The invention provides a composition structure of a sound absorption and insulation composite material. The composition structure is formed by closely pasting at least one fiber non-woven fabric layer to at least one closed foam layer having a plurality of independent closed pores, wherein the fiber non-woven fabric layer is a fiber lamination layer prepared from an environmentally-friendly recycled fiber material through using a non-woven fabric making method, has a thickness of 0.5mm or more and has a weight between 50g / m<2> and 3000g / m<2>, and the closed foam layer is a closed foam body having a plurality of independent closed pores and has a thickness of 1mm or more; a thermoplastic plastic film is closely pasted on the lateral surface of the fiber non-woven fabric layer to increase the sound absorption effect; the thermoplastic plastic film can be closely pasted on the surface layer of the closed foam layer no matter the surface layer of the closed foam layer is a split surface or not to increase the sound insulation effect; and the thickness of the closely pasted thermoplastic plastic film is between 0.009mm and 0.1mm.

The invention discloses a preparation method of a PIF foamed polymer sound insulation material, and the method comprises the following steps: preparing a PP blending material, carrying out pressure induced flow forming (PIF) treatment on the blending material, and carrying out a supercritical CO2 foaming process to prepare a periodic laminated structure high polymer material with gaps. The prepared material has the advantages of light weight, good processability, strong sound insulation performance and the like, and is expected to be widely applied to the fields of home decoration, traffic transportation, road sound insulation and the like.

The invention discloses a groove type perforated plate staggered soundproof structure with air interlayers. The structure comprises perforated plates, grooves and the air interlayers, and the perforated plates are in staggered arrangement according to perforating positions. The structure has advantages of ventilation, heat dissipation, light weight and freeness of energy consumption while a soundproof effect is achieved. In implementation, one side, with the grooves, of the groove type perforated plate staggered soundproof structure faces a noise sound. The perforated plates intrinsically havecertain soundproof performance, reflection of incident sound waves can be improved by the grooves, and the soundproof performance is further improved. A soundproof frequency range can be expanded bythe air interlayers, the perforated plates are staggered according to the perforating positions, and accordingly scattering and friction of sound waves in the structure can be increased to result in high loss, and the soundproof performance is further improved.

The invention discloses a comprehensive noise reduction and noise reduction structure for a ventilation duct, comprising: a composite sound insulation and sound absorption component, which is wrapped on the outer wall of the duct to reduce the vibration of the duct and absorb high-frequency noise; The plate surface of the orifice plate is perpendicular to the flow direction of the gas in the pipeline; the diameter of the expansion muffler section is larger than the diameter of the pipeline, and the two ends of the expansion muffler section are respectively connected with the pipeline, and the sound waves are reflected in the expansion muffler section to attenuate the noise; the elbow guide The flow sheet is arranged at the elbow of the pipeline, and the guide plate of the elbow matches the bending degree of the elbow of the pipeline, so as to equalize and stabilize the gas flow in the pipeline; the invention overcomes the incomplete noise reduction of the existing pipeline. , The transformation process is complicated and the cost is high. Through the combination of flow field optimization and anti-sound noise reduction, the problem of poor control effect of low-frequency noise generated by pipeline fluid flow is solved, which effectively reduces the ventilation resistance of fan pipelines, saves energy consumption, and eliminates The pipeline has low and medium frequency noise, improving the overall sound insulation performance.