88results about How to "Strong sound absorption" patented technology

The invention discloses environment-friendly diatom ooze wall material powder and a wall material as well as a preparation method and application thereof. The diatom ooze wall material with macromolecule sieve structure is prepared by taking a plurality of natural environment-friendly non-metal material having strong adsorbability and good plasticity as main materials through a simple process. The environment-friendly diatom ooze wall material powder has the advantages of low cost, air purification, moisture absorption, deodorization, inflaming retarding, heat insulation, easy popularization,and the like.

The invention provides a zeolite-like lightweight heat preservation and sound insulation board applied to a building outer wall, or wall filling of a nonbearing wall or a building top layer. The board comprises dry powder slurry and lightweight aggregate, wherein the dry powder slurry is a zeolite-like geopolymer formed by the excitation of a composite alkali excitant and comprises the following components in percentage by weight: 70-85 percent of coal ash, 5-15 percent of phosphorus slag, 8-20 percent of composite alkali excitant and 0.1-0.3 percent of anticracking fiber; the lightweight aggregate is EPS (Expandable Polystyrene) granules; and the charge ratio of the dry powder slurry to the lightweight aggregate is (89-95): (5-15). The zeolite-like lightweight heat preservation and soundinsulation board has low volume weight, high compression strength, favorable heat preservation and heat insulation properties and good sound absorption effect on various frequency bands of sound waves. The invention also provides a production method of the zeolite-like lightweight heat preservation and sound insulation board. The method has simple process conditions and is easy to realize.

The animal leather yarn consists of mechanically opened animal leather fiber in 1-100 wt% and other textile fiber in 0-99 wt%, and the animal leather fiber and other textile fiber in the same weight ratio are crossed and twisted to form the animal leather yarn. Leather processed through traditional leather processing process is further processed through sorting, swelling, opening, deguming, decolorizing, impurity eliminating, grading, mixing, finishing, carding into sliver, twisting and spinning to produce the animal leather yarn. The present invention raises the utilization of leather, expands leather application and, especially, solves the problem of waste leather utilization.

The invention relates to a plant configuration used for urban road traffic noise reduction. Configured plants comprise evergreen tree species, deciduous tree species, evergreen shrub species, deciduous shrub species and a lawn, wherein the evergreen tree species comprise Cinnamomum camphora and Ligustrum lucidum; the deciduous tree species comprise gingko, Zelkova serrate and Prunus cerasifera; the evergreen shrub species comprise sweet-scented osmanthus and oleander; the deciduous shrub species comprise Hibiscus syriacus L, Chinese redbud, flowering peach and multiflora rose; and the lawn is a Manila lawn. The evergreen tree species, the deciduous tree species, the evergreen shrub species and the deciduous shrub species used for the plant configuration are called by a nursery stock and respectively come from a nursery garden. The plant configuration used for the urban road traffic noise reduction has the advantages that the environment is beautified; the service life is long; the operability is strong; the landscape property is good; the ecological value is high; the cost is low; planting and maintenance are easy; the noise reduction effect is good; and the noise reduction function is efficient. Better noise reduction can also be performed on zones of which road green belts are not sufficient or stained in width because of the limitations of geographic locations or the ambient environments, and a very good action is performed in creating an urban favorable living environment.

The invention discloses a light-quality high-strength hyper-insulating architectural block, which comprises the following parts: 20%-40% cement, 19%-25% coal slag, 12%-25% basalt, 5%-15% mineral slag and 6%-15% doped material, wherein the doped material is composed of 80%- 90% modifier material and 10%-20% composite additive; the modifier material is one or two or more composition of vermiculite, pumice, foam glass, pearlite or diatomite according to random proportion; the compound additive is composed of 2.3% sodium hexametaphosphate, 0.7% triethanolamine and residual calcium oxide or sodium sulphate or their composition according to certain proportion.

The invention discloses a loudspeaker module, and relates to the technical field of electroacoustic products. The loudspeaker module comprises a module shell, and a loudspeaker monomer is contained in the module shell and divides a whole module inner cavity into a front acoustic cavity and a back acoustic cavity; a sound absorption cavity is arranged in the back acoustic cavity in a hanging mode and filled with sound absorption materials, a shell of the sound absorption cavity is provided with a filling opening used for filling the sound absorption materials, and the filling opening is covered with a sealing sheet; the two opposite sides of the shell are each provided with a net-shaped part, and gaps are formed between the two sides, provided with the net-shaped parts, of the shell and the module shell respectively. The loudspeaker module solves the technical problem that in the prior art, the sound absorption effect of sound absorption materials of a loudspeaker module is poor. The loudspeaker module has the advantages that the sound absorption function of the sound absorption materials can be fully achieved, the sound absorption effect is good, F0 is lower, the acoustic performance is obviously improved, and the sound quality is better.

The present invention discloses one kind of foamed aluminum material. The foamed aluminum material is prepared through a particle permeating process, and the preparation process includes the following steps: preparing mixed RE pellet with kaolin, white carbon black, expanded clay and calcium carbonate in certain weight proportion and through mixing, pelletizing and drying; pre-heating the mold and the mixed RE pellet to 550 deg.c-650 deg.c, near the temperature for aluminum liquid to permeate; permeating aluminum liquid at 8-45 MPa into the gaps of mixed RE pellet; cooling and washing the taken casting with water solution at 45-65 deg.c to obtain foamed aluminum material. The foamed aluminum material with separated and continuous foams has excellent sound absorbing effect.

The invention discloses anti-cracking plastering gypsum mortar. The anti-cracking plastering gypsum mortar is prepared from the following raw materials: high-temperature calcined gypsum, ash calcium powder, composite portland cement, expanded perlite, fly ash, hydroxypropyl methyl cellulose ether, a retarder, a water reducing agent, starch ether, redispersible latex powder, polypropylene fibers and a waterproof agent. The invention provides the environment-friendly type lightweight bottom-layer plastering gypsum mortar which has good anti-cracking performance, has good heat insulation performance and can automatically adjusting temperature and humidity. By adopting the anti-cracking plastering gypsum mortar, the density of the mortar and the self weight of buildings can be effectively reduced; the anti-cracking plastering gypsum mortar has good sound insulation and noise reduction effects and has the advantages of uniformity in material preparation, convenience for construction, capability of being firmly stuck with a base layer, no hollowing, no falling, no cracks, fireproof and heat-resisting performance, heat insulation and sound insulation, greenness and environment protection,low cost and the like.

The invention relates to colored asphalt, particularly to a colored asphalt road applicable to various environments and a construction process thereof. The construction process comprises the following steps: preparing materials; heating aggregates; feeding color powder; producing colored asphalt; discharging and detecting. The colored asphalt road prepared by adopting the production process and the construction process is good in road application performance and good in high temperature stability, water damage resistance and durability at different temperatures and in different external environments, has no phenomenon such as deformation, dropping of the asphalt and the like, has good binding property with a basic layer, has bright and durable color, is not faded, can resist the high temperature of 77 DEG C and low temperature of -23 DEG C and is fast in construction period, convenient and rapid to produce, fast to construct, high in efficiency and capable of effectively reducing the traffic delay caused by the construction.

The invention relates to the technical field of building materials, in particular to an energy-saving environment-friendly light security fire door core plate applied to a steel structure, a wooden structure and a steel wooden structure. The energy-saving environment-friendly light security fire door core plate comprises magnesium chloride, fly ash and water, which is characterized by further comprising magnesium oxide, waterproof glue, industrial-grade hydrochloric acid and magnesite plate material vesicant, wherein the energy-saving environment-friendly light security fire door core plate comprises the following components according to parts by weight: 15 to 25 parts of magnesium chloride, 10 to 15 parts of fly ash, 20 to 30 parts of water, 35 to 45 parts of magnesium oxide, 0.5 to 1.5 parts of waterproof glue, 0.5 to 1.5 parts of industrial-grade hydrochloric acid and 0.5 to 1.5 parts of magnesite plate material vesicant. The energy-saving environment-friendly light security fire door core plate has the advantages of energy saving, environment protection, no toxicity and harm to a human body, favorable properties of fire prevention, water prevention, insulation and heat insulation, good sound-absorbing effect, high strength, long service life, and the like; and the manufacturing method of the energy-saving environment-friendly light security fire door core plate has the advantages of simple technology, short procedure, minimum cost, and the like.

The invention relates to a fireproof plate, in particular to a fireproof door core plate. The invention discloses the energy-saving, environment-protection and light-weight fireproof door core plate with the advantages that the energy is saved, the environment is protected, nontoxicity and harmlessness are realized on human bodies, the fireproof and heat insulation performance is good, the sound absorption effect is good, the intensity is high, the service life is long, and the cost is low. The invention also provides a manufacture method of the door core plate, and the manufacture method has the advantages that the process is simple, and the flow process is short. The fireproof door core plate is made from following materials in parts by mass: 100 parts of magnesium oxide, 40 to 50 parts of magnesium chloride, 30 to 40 parts of water, 0.3 to 1 parts of modifying agents, 0.3 to 0.5 parts of foaming agents and the like.

A building sound absorbing material is disclosed. The building sound absorbing material comprises 10-15 parts by weight of phenolic resin, 10-15 parts by weight of polypropylene, 5-20 parts by weight of diatomite, 6-8 parts by weight of hollow glass microbeads, 5-15 parts by weight of perlite, 1-3 parts by weight of barium sulfate, 1-5 parts by weight of titanium dioxide, 6-10 parts by weight of straw, 1-5 parts by weight of a coupling agent and 1-2 parts by weight of a thickening agent. The building sound absorbing material has an excellent sound absorbing function and is capable of effectively absorbing noise in the environment and reducing noise hazards. The building sound absorbing material is nontoxic and harmless, can be used as inner wall and outer wall materials, and is wide in uses.

The invention discloses a micro-perforated corrugated-honeycomb metamaterial plate structure capable of improving sound insulation and absorption performance, belongs to the technical field of engineering vibration and noise reduction, and aims at solving the problems that: the mechanical property and acoustic property of traditional sandwich plate type components are limited, and the sound insulation quantity and sound absorption capacity are poor in engineering application. The corrugated-honeycomb metamaterial sandwich plate comprises a top plate, N corrugated honeycomb sandwich units and a bottom plate, the N corrugated honeycomb sandwich units are periodically arranged between the top plate and the bottom plate, every two adjacent corrugated honeycomb sandwich units are separated through a partition plate, the top of each corrugated honeycomb sandwich unit is fixedly connected with the lower surface of the top plate, the bottom of each corrugated honeycomb sandwich unit is fixedly connected with the upper surface of the bottom plate, four local resonance mechanisms are periodically distributed between each corrugated honeycomb sandwich unit and the bottom plate, and each local resonance mechanism is fixedly connected to the upper surface of the bottom plate.

The invention provides environment protective and sound absorbing and insulative indoor decorative coating which adopts the raw materials with the following weight percentage: 8 percent to 30 percent of small cork particles, 75 percent to 90 percent of adhesive and 0 percent to 17 percent of water. The small cork particles are made of oak bark; the adhesive is glue or water soluble resin. The decorative coating prepared by the method of the invention has the advantages of strong sound absorbing and insulating performance, environmental protection and energy saving, anti-cracking and anti-insect, anti-mildew and anti-moisture, excellent insulating performance, and very good wall surface decorative effect.

The invention discloses an oil tank structure capable of effectively reducing power transformer noise. The oil tank structure is characterized in that an oil tank wall adopts a double-layer structure; an outer wall of the double-layer oil tank consists of U-shaped reinforcing ribs and steel plates arranged at intervals; dry sand is filled between the inner wall and the outer wall of the double-layer oil tank and in inner cavities of the U-shaped reinforcing ribs. A scientific principle of the oil tank structure is that a sound wave is an energy wave, when the sound wave meets a barrier, friction is generated between the barrier and the sound wave, energy of the sound wave is converted into heat energy, the energy of the sound wave is reduced, and the noise is reduced. The transformer noise can be effectively reduced by about 10dB under the premise that any other noise reduction measure is not taken, and high-capacity power transformer noise is greatly reduced.

The invention provides a device for measuring gas pressure by using ultrasonic wave. The device comprises a sonic apparatus, a wire, a controlling and processing device and a display, wherein the sonic apparatus comprises a shell, a closing cover, an upper coal clamping plate, a lower coal clamping plate, a sonic emitter, a standard test coal pillar and a sonic receiver; one end of the shell is closed, and the other end of the shell is open; the opening is sealed by using the sealing cover; the standard test coal pillar is placed in the middle of the shell; one end of the standard test coal pillar is clamped by using the lower coal clamping plate, and the other end of the standard test coal pillar is clamped by using the upper coal clamping plate; the lower coal clamping plate is provided with the sonic emitter; one end of the sonic emitter is in contact with the standard test coal pillar, and the other end of the sonic emitter is connected with the controlling and processing device through the wire; the upper coal clamping plate is provided with the sonic receiver; one end of the sonic receiver is in contact with the standard test coal pillar, and the other end of the sonic receiver is connected with the controlling and processing device through the wire. The device provided by the invention has the advantages of accuracy in measurement, convenience in operation, time saving effect, labor saving effect and the like. The invention also provides a method for measuring the gas pressure by using the device.

The invention provides a sound-absorbing ceramic material and a preparation method thereof. The composition and the preparation method include: firstly grinding feldspar, clay and quartz sand into powder and conducting mixing; mixing gelatin, guar gum and water, and stirring the mixture into a paste, then mixing the material with ascorbyl palmitate, sodium citrate, sodium hexametaphosphate, guar gum, sodium dodecyl sulfate, sodium alcohol ether sulphate, sodium silicate, Tween 80, polyacrylate, and cetyltrimethylammonium chloride, adding the mixture into a ball mill to conduct ball milling, subjecting the milled slurry to water bath, then using a high speed mixer to conduct stirring foaming; pouring the foaming material into a mold to conduct curing molding; and carrying out demolding and drying, and finally raising the temperature to 1700-1800DEG C under nitrogen protection at a rate of 10DEG C / min, and carrying out dumping and sintering, thus obtaining the sound-absorbing ceramic material. The sound-absorbing ceramic material provided by the invention has strong compressive strength, good mechanical properties, strong sound absorption ability and good effect, and is an ideal sound-absorbing material.

The invention discloses a foamed aluminum material. The foamed aluminum material is prepared by a particle infiltration method. The preparation method is as follows: the filling material consists of 80% to 92% of kaolin, 3% to 7% of white carbon black, 4% to 9% % of expansive soil and 1% to 4% of calcium carbonate, by weight, use a granulator to make the filler into a spheroid, and dry the spheroid naturally or at low temperature; preheat the mold and the spheroid , the preheating temperature is 550 ℃ ~ 650 ℃, which is close to the temperature to be infiltrated into the molten aluminum; infiltrate the molten aluminum into the gap of the spheroid at 8 ~ 45 × 106 Pa; after cooling, take out the casting and use a The spheroids are washed with an aqueous solution, after which aluminum foam is obtained. The aluminum foam material of the invention has both independent cells and continuous cells, has a strong sound-absorbing effect, the formed holes are uniform in size, beautiful in appearance, and can save preparation cost and energy consumption.

The invention discloses an indoor wall board having a sound absorption function, which includes the following components, by weight: 20-25 parts of phenolic resin, 6-14 parts of an acrylic emulsion, 10-15 parts of wood fiber, 4-12 parts of gypsum, 5-8 parts of zeolite, 5-10 parts of perlite, 2-6 parts of titanium dioxide, 1-5 parts of chlorinated paraffin and 1-3 parts of xanthan gum. The indoor wall board has an excellent sound absorption function, can effectively absorb noise in environment and reduce the damage due to the noise, and meanwhile is high in surface hardness, is not liable to scratch, is good in toughness and can be widely used in various indoor decorations.

The invention discloses a processing method for producing a formaldehyde-free environmentally-friendly ecological board from rice straw, and belongs to the field of ecological boards. The processing method comprises the following steps of S1, cleaning straw; S2, crushing the straw; S3, modifying the straw; S4, preparing straw material; and S5, feeding the straw material, bamboo powder material, adhesive material, flame retardant material, calcium carbonate, magnesium hydroxide, nano sponge, carboxymethyl cellulose, glass fiber, water and ethyl alcohol in a stirrer, performing uniform stirring,then performing laying, prepressing and hot-pressing, and finally sawing edges, thereby obtaining the ecological board. The formaldehyde-free environmentally-friendly ecological board produced according to the processing method has the advantages that the straw is recycled, replaces wood, does not contain harmful substances, can resist fire and water, has certain sound absorption performance, protects the ecological environment, and increases the social benefits.

The invention discloses an indoor decorative diatomite coating and a preparation method thereof, wherein the indoor decorative diatomite coating comprises the following components in parts by weight:30-50 parts of diatomite, 3-5 parts of glass fibers, 4-6 parts of modified bentonite, 2.5-3.5 parts of magnesium sulfate, 1-3 parts of modified shell powder, 1.5-3.5 parts of water-soluble resin, 4-6parts of plant fibers, and 1-3 parts of an adhesive. The content of SiO2 contained in diatomite is more than or equal to 90% by weight, and the particle size of diatomite is 100-160 mesh. The diatomite material has large specific surface area and strong adsorption capacity, is combined with various mixed materials, light reflection is enhanced by the glass fibers, absorption of moisture and formaldehyde is enhanced by addition of the plant fibers, indoor air pollutants are greatly reduced, and the indoor environment is initiatively improved; diatomite has permeable pore diameter, the indoor decorative diatomite coating has extremely strong heat preservation property and sound absorption, and moreover, diatom mud can eliminate static electricity in indoor air, has a function of killing parasites and microorganisms, prevents a wall surface from getting mildew and changing color, and obviously reduces indoor peculiar smell.

The invention discloses a nonwoven fabric composite sound-absorbing lamination fabric for automobile internal decoration and a manufacturing method thereof. The sound-absorbing lamination fabric comprises a micropore sound-absorbing thin film layer, a connecting layer and an automobile internal decoration nonwoven fabric layer. The manufacturing method comprises the steps: unwinding the automobile internal decoration nonwoven fabric layer and the micropore sound-absorbing thin film layer, arranging the connecting layer on the micropore sound-absorbing thin film layer, laminating the micropore sound-absorbing thin film layer on at least one surface of the automobile internal decoration nonwoven fabric layer through the connecting layer for composite, carrying out hot-pressing, winding, carrying out room temperature ripening, unwinding, carrying out edge cutting and shunt winding, inspecting, and packing. According to the above method, the sound-absorbing lamination fabric can obviously absorb various frequency noises inside an automobile, greatly reduces the automobile internal noise value, gives a person a quiet driving and riding environment, and allows occurrence of traffic accidents caused by fatigue driving due to the automobile noises to be greatly reduced. The novel fabric is allowed to have more significant and remarkable sound-absorbing function, and allows an only beauty decorating effect of a conventional automobile internal decoration nonwoven fabric to be changed.

The invention relates to the field of exhausting and silencing equipment, in particular to a damping-adjustable magneto-rheological piezoelectric exhaust silencer. The damping-adjustable magneto-rheological piezoelectric exhaust silencer comprises a hollow barrel, and an air inlet pipe and an air outlet pipe are arranged along the two ends of the barrel. The barrel comprises a shell, glass wool and a perforated plate. The interior of the barrel is divided into a first cavity, a second cavity and a third cavity by a left separation plate and a right separation plate in the direction perpendicular to the axis of the barrel. The air inlet pipe communicates with the first cavity, and the air outlet pipe communicates with the third cavity. A rotary shaft coaxial with the barrel is arranged on the left separation plate, and a sound absorption blade is mounted on the rotary shaft stretching into the first cavity. The sound absorption blade is formed by bonding a piezoelectric crystal plate and a metal substrate, and a damping unit is arranged on the rotary shaft stretching into the second cavity. The damping-adjustable magneto-rheological piezoelectric exhaust silencer has the beneficialeffects that the kinetic energy of airflow is converted into mechanical energy through the sound absorption blade, and the sound absorption capacity is high; and power is supplied to the damping unitthrough electric energy generated through the piezoelectric effect, the structure is simple, and cost is reduced.

The invention provides a zeolite-like lightweight heat preservation and sound insulation board applied to a building outer wall, or wall filling of a nonbearing wall or a building top layer. The board comprises dry powder slurry and lightweight aggregate, wherein the dry powder slurry is a zeolite-like geopolymer formed by the excitation of a composite alkali excitant and comprises the following components in percentage by weight: 70-85 percent of coal ash, 5-15 percent of phosphorus slag, 8-20 percent of composite alkali excitant and 0.1-0.3 percent of anticracking fiber; the lightweight aggregate is EPS (Expandable Polystyrene) granules; and the charge ratio of the dry powder slurry to the lightweight aggregate is (89-95): (5-15). The zeolite-like lightweight heat preservation and soundinsulation board has low volume weight, high compression strength, favorable heat preservation and heat insulation properties and good sound absorption effect on various frequency bands of sound waves. The invention also provides a production method of the zeolite-like lightweight heat preservation and sound insulation board. The method has simple process conditions and is easy to realize.

The invention relates to a double-hollow steel wire frame heat-preservation board and belongs to the field of building materials. The double-hollow steel wire frame heat-preservation board comprises a middle heat-preservation board and two side heat-preservation boards, wherein convex groove checks and limiting tables are evenly distributed on the surface of the middle heat-preservation board. Concave groove checks corresponding to the convex groove checks are evenly formed in the inner surfaces of the two side heat-preservation boards. The outer surfaces of the two side heat-preservation boards are rough and are evenly distributed with convex points. The bonding force between the heat-preservation board and concrete is effectively increased, and the double-hollow steel wire frame heat-preservation board has sound insulation and absorption functions. The double-hollow steel wire frame heat-preservation board achieves that a heat-preservation wall body is equal to a beam in width. The double-hollow steel wire frame heat-preservation board has more excellent heat-preservation heat-insulation and sound-absorption functions. A heat-preservation layer of the heat-preservation board is isolated from the outside, so that the durability of a heat-preservation material is ensured. The double-hollow steel wire frame heat-preservation board has the advantages of being capable of preserving heat, and being fire-proof, weather-proof, water-proof, sound-insulating, crack-resistant and anti-seismic structurally.

The invention discloses a waste rubber powder dry micro-surfacing mixed material and a preparation method thereof. The waste rubber powder dry micro-surfacing mixed material is prepared from, by masspercent, 100% of basalt aggregate, 12%-13% of SBR (styrene butadiene rubber) modified emulsified asphalt, 1%-2% of ordinary Portland cement, 1%-3% of waste rubber powder and water in a weight ratio of5%-7% to the aggregate; the waste rubber powder dry micro-surfacing mixed material is in an MS-3 medium grading; the ordinary Portland cement is P.O42.5 ordinary Portland cement. The preparation method of the waste rubber powder dry micro-surfacing mixed material includes steps of detecting raw materials according to the technical requirements in Micro-surfacing and Slurry Seal Technical Manual,according to the proportional ratio, weighing out the basalt aggregate, the cement and the waste rubber power which are qualified, and manually uniformly mixing the raw materials inside a mixing pot;pouring water of the specified weight into the mixing pot, uniformly mixing for about 15 seconds; then pouring the SBR modified emulsified asphalt of the specified weight into the mixing pot, and continuing to manually uniformly mixing for 15 seconds to obtain the waste rubber powder dry micro-surfacing mixed material.

The invention discloses a novel engine exhaust pipe, comprising a drum core, an air inlet and an air outlet. The drum core is a sealed hollow cylinder structure formed by the air inlet and air outlet which extend into the drum core and a plurality of noise reducing chambers composed of a plurality of separating mesh plates; each noise reducing chamber is internally and peripherally provided with a mesh plate with meshes and noise reducing cotton; a plurality of noise reducing holes are arranged around the air inlet end extending into the hollow cylinder structure of the drum core; and the individually sealed noise reducing chamber with noise reducing cotton is arranged around the position of the noise reducing hole. The invention adopts a small quantity of separating mesh plates in the hollow cylinder structure of the drum core and a large amount of noise absorbing cotton to form a plurality of noise reducing chambers so as to efficiently realize the best noise absorbing effect on the basis of keeping unobstructed air exhaust; the unobstructed air exhaust reduces the load of the engine and causes the combustion chamber to get more sufficient air supply so as to guarantee that the air in the combustion chamber is completely combusted to best explore the power, thus realizing the effects of ultra silence, strong power and low oil consumption.

The invention provides a simple foamed aluminum silencer. The simple foamed aluminum silencer comprises a hollow cylindrical housing. A silencer inlet is formed in one end of the cylindrical housing, and a silencer outlet is formed in the other end of the cylindrical housing. A perforated pipe and two foamed aluminum plates are arranged in the cylindrical housing. The foamed aluminum plates are provided with holes and are both perpendicular to the axis of the cylindrical housing. The two foamed aluminum plates are fixed to the inner wall of the cylindrical housing in a sealed mode. The perforated pipe and the cylindrical housing are coaxially arranged. The two ends of the perforated pipe penetrate through the two foamed aluminum plates respectively. Silencing holes are formed in the portion, between the two foamed aluminum plates, of the perforated pipe. The simple foamed aluminum silencer aims to solve the problem that existing silencer materials can cause environment pollution and endanger human health, are prone to moisture absorption and weathering, and are short in service life and poor in effect. The invention belongs to the technical field of silencers.