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

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 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 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 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 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 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 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 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.