46results about How to "Improve the attenuation effect" patented technology

The invention discloses an active and passive composite vibration reduction system, and particularly relates to the technical field of vibration reduction equipment, the active and passive composite vibration reduction system comprises a bottom shell, a load platform, a passive vibration reduction device and an active vibration reduction device, and the passive vibration reduction device and the active vibration reduction device are both arranged between the bottom shell and the load platform; the passive damping device comprises a positive stiffness mechanism and a negative stiffness mechanism which are arranged in parallel; the active damping device comprises a controller, a sensor, a piezoelectric actuator and a flat plate type voice coil motor, the sensor is fixed on the load platform, the sensor, the piezoelectric actuator and the flat plate type voice coil motor are all in signal connection with the controller, and the controller processes signals transmitted by the sensor and transmits commands to the piezoelectric actuator and the flat plate type voice coil motor. The method has higher control precision, stronger anti-interference capability and more excellent adaptability and flexibility, the inherent frequency and the formant peak value of the damping device are effectively reduced, the high attenuation of high-frequency vibration is ensured, and broadband vibration attenuation is realized.

The present invention provides a FeNiHo / carbon nanofiber composite absorber and a preparation method thereof, an absorbent material and a preparation method thereof, and belongs to the technical field of electromagnetic wave absorbing materials. The present invention first mixes iron salt, nickel salt, holmium salt and polyvinyl pyrrolidone in a mixed solvent, and electrostatically spins the obtained spinning precursor solution to obtain a nanofiber membrane; the nanofiber membrane is sequentially subjected to pre-oxidation treatment and carbonization treatment to obtain a FeNiHo / carbon nanofiber composite absorber. The FeNiHo / carbon nanofiber composite absorber, paraffin and petroleum ether are mixed, and then pressed and irradiated with ultraviolet light to obtain an absorbing material. The FeNiHo alloy nanoparticles in the composite absorber improve the impedance matching performance and electromagnetic wave attenuation ability of the carbon nanofiber. The obtained absorbing material can achieve the purpose of real-time adjustment of the absorption frequency by irradiation with ultraviolet light.

The invention provides a diamond trephine which comprises a steel base body and a tool bit, the tool bit comprises the following raw materials in percentage by weight: 50%-60% of superfine iron-nickel pre-alloy powder, 15%-30% of superfine copper powder, 2%-5% of tin powder, 15%-30% of superfine tungsten carbide powder, 5%-10% of yttrium oxide powder and the balance of diamond raw materials, and the diamond raw materials comprise the superfine iron-nickel pre-alloy powder, the superfine copper powder, the tin powder, the superfine tungsten carbide powder, the yttrium oxide powder and the diamond raw materials. The trephine is characterized in that the trephine comprises a steel base body, the steel base body is provided with a plurality of tool bits, the tool bits comprise 3%-6% by volume of yttrium oxide powder and 15%-50% by volume of diamond, the granularity of the tool bits is 400-700 microns, one faces of the tool bits are arranged on the steel base body at intervals through laser welding, the other faces of the tool bits are provided with U-shaped grooves, and the two side faces of the tool bits are further provided with V-shaped grooves. The method specifically comprises the steps of burdening, mixing, coating, cold press molding, hot press sintering, laser welding and the like. According to the trephine, the cutting speed of the trephine can be effectively increased, the service life of the trephine can be effectively prolonged, the U-shaped groove and the V-shaped groove are formed in the tool bit, the contact area between the tool bit and a cutting material is reduced, friction cutting resistance is reduced, and the chip removal capacity and sharpness of the trephine can be obviously improved.

The present invention relates to a damping system for a hydraulic coupling device, comprising: an output hub having a central axis and an annular portion around the central axis, wherein a first track is arranged in the annular portion; a plurality of turbine mass groups evenly distributed around the central axis, each turbine mass assembly comprising a turbine section, each turbine section carrying a plurality of blades and provided with a second track corresponding to the first track; a roller capable of rolling along a roller track defined by the first track and the corresponding second track, so that the turbine mass assembly can move relative to the output hub and apply torque on the output hub; wherein each turbine mass assembly also comprises a mass plate fixedly connected to the turbine section, and the output hub is arranged between the mass plate and the turbine section. The present invention also relates to a hydraulic coupling device comprising such a damping system and a motor vehicle comprising such a hydraulic coupling device.

The invention discloses a miniature bending-resistant low-loss high-temperature-resistant optical fiber and a preparation method thereof. The optical fiber comprises a fiber core, an inner cladding layer, a sunken layer, a first outer cladding layer, a second outer cladding layer, an inner coating layer and an outer coating layer, the relative refractive index difference delta 1 of the fiber core ranges from 0.30% to 0.89%, the relative refractive index difference delta 2 of the inner cladding ranges from-0.002% to-0.08%, the relative refractive index difference delta 3 of the sunken layer ranges from-0.3% to-0.015%, the relative refractive index difference delta 4 of the first outer cladding ranges from-0.1% to 0.02%, and the second outer cladding is a pure silicon dioxide glass layer. The optical fiber has high bending resistance, high temperature resistance and hydrogen loss resistance, and can solve the problems of narrow wiring space, stress concentration after aging and hydrogen loss increase of the traditional optical fiber in high temperature and other environments.

An antenna module is provided with: a substrate including a first dielectric layer and a second dielectric layer having a dielectric constant different from that of the first dielectric layer; a first antenna that is provided in the first dielectric layer and transmits and receives a signal of a first frequency band; a second antenna that is provided on the second dielectric layer and that transmits and receives a signal in a second frequency band that is a frequency band lower than the first frequency band; and a high-frequency circuit provided on the substrate and electrically connected to the first antenna.

The application discloses a semiconductor-dielectric-conductor type attenuation porcelain and a preparation method thereof, and relates to the technical field of electromagnetic wave absorption and attenuation materials. The attenuation porcelain is composed of a semiconductor phase, a dielectric phase, a conductor phase, a sintering aid and a binder; the conductor phase has a core-shell structure of a nickel-cobalt-cerium alloy solid solution inner core, a nitrogen-doped amorphous carbon intermediate layer and a silicon dioxide shell, and cerium atoms are doped in the nickel-cobalt alloy solid solution lattice in the form of lattice distortion. The preparation method comprises the following steps: preparation of a precursor solution, limited silicon dioxide coating, limited in-situ reduction and defect construction, mixing and forming, and high-temperature sintering. Through the synergistic effect of the semiconductor phase, the dielectric phase and the core-shell conductor phase, the application realizes comprehensive enhancement of impedance matching, interface polarization, conductive loss and multiple scattering attenuation, and can improve the high-temperature stability and electromagnetic wave attenuation performance of the attenuation porcelain.

The embodiment of the invention provides a display substrate and a display device. The display substrate comprises a grid signal line layer and a source and drain electrode layer. The gate signal line layer comprises a second signal line part of a gate signal line, and the source and drain electrode layer comprises a first signal line part of the gate signal line; in the same grid signal line, the second signal line part is connected with the first signal line part through the first via hole; the material resistivity of the first signal line part is smaller than that of the second signal line part; the grid signal line layer further comprises a fourth signal line part of the data signal line, and the source and drain electrode layer further comprises a third signal line part of the data signal line; in the same data signal line, the adjacent third signal line part and fourth signal line part are connected through a second via hole; the orthographic projection of the third signal line part and the orthographic projection of the first signal line part on an array substrate of the display substrate are not overlapped, and the orthographic projection of the fourth signal line part and the orthographic projection of the first signal line part on the array substrate are overlapped.

The invention provides MnxZn (1-x) Fe2O4 powder and a preparation method thereof, and belongs to the technical field of ferrite preparation. According to the invention, the ferrite material with excellent electromagnetic performance and wave-absorbing performance is obtained by directly performing high-temperature mechanochemical treatment on the oxide raw material. Compared with the prior art, the preparation method is simple in process, overcomes the defects of narrow absorption band, high density and poor weather resistance of ferrite as a wave-absorbing material, and has important significance.

The application discloses a kind of high resilience self-repairing polyurethane elastomer and preparation method thereof.The preparation method includes the pre-polymerization of secondary amine end-capped polyether amine and diisocyanate in organic solvent, to obtain isocyanate end-capped prepolymer;Diamine and / or hydrazine chain extender are added to the prepolymer to carry out chain extension reaction, to obtain chain extension product containing urea bond and hydrazine bond;Trifunctional isocyanate crosslinking agent is added to the chain extension product to carry out crosslinking reaction, and after reaction to gelation critical point, it is formed by pouring into shape.The application constructs the interpenetrating double network structure of high-density multiple hydrogen bond physical network and dynamic covalent bond chemical network interpenetration, so that the resilience of elastomer reaches 92.7%~95% under 100%~300% strain, and the self-repairing efficiency reaches more than 72% after 12h repair at room temperature without external stimulation, realizes the synergistic improvement of high resilience, high tensile and high-efficiency self-repairing performance, and can be used in flexible electronic devices, wearable sensors and flexible substrates in biological medical detection equipment.

The invention discloses a preparation method and application of a Co (at) G / CNT nanorod composite material with ultra-wide electromagnetic wave absorption performance, and the preparation method of the composite material comprises the following steps: adding an acetate solution of Co and Zn into a mixed solution of dimethylimidazole and CTAB, stirring at room temperature, carrying out a hydrothermal synthesis reaction on the obtained solution, washing and drying the synthesized product to obtain the Co (at) G / CNT nanorod composite material with ultra-wide electromagnetic wave absorption performance. And calcining in an Ar / H2 atmosphere to obtain a target product. The in-situ growth method is used, the carbon nanotubes are directly induced to grow on the carbon rod substrate, and the carbon nanotubes can form a continuous conductive network, so that electromagnetic parameters such as dielectric constant and magnetic conductivity of the material can be adjusted, and effective wave absorption in a wider frequency band can be realized. The magnetic metal for promoting the generation of the carbon nanotubes also provides magnetic loss, and the wave-absorbing performance is further improved through the good synergistic effect of the dielectric loss and the magnetic loss of the composite material.

The draught fan damping device comprises a damping unit, a first machine foot plate and a second machine foot plate, wherein the first machine foot plate and the second machine foot plate are parallel to each other. Each vibration reduction unit comprises at least three layers of coaxial vibration reduction cylinders and a plurality of connecting rings, the end faces of every two adjacent layers of vibration reduction cylinders are connected through one connecting ring, and every two adjacent connecting rings are connected with the two end faces of the same vibration reduction cylinder correspondingly. The first machine foot plate is connected with the vibration reduction cylinder on the innermost layer, is positioned outside the vibration reduction cylinder on the innermost layer and is used for mounting a fan; the second machine foot plate is connected with the vibration reduction cylinder on the outermost layer, located outside the vibration reduction cylinder on the outermost layer and used for being connected with the installation platform. The vibration of the fan is transmitted to the vibration reduction cylinder on the innermost layer from the first machine foot plate, sequentially transmitted to the vibration reduction cylinder on the outermost layer from inside to outside and then transmitted to the second machine foot plate, under the vibration reduction device with the same height, the transmission path of the vibration can be enlarged by more than three times, the good effect on energy consumption and attenuation of low-frequency vibration is achieved, and the service life of the fan is prolonged. The longitudinal space can be fully utilized, and the applicability of the device is improved.

The wave-absorbing foam prepreg comprises a pure resin adhesive film layer, a wave-absorbing foam layer with a double-foam structure and a wave-absorbing adhesive film layer, wherein the double-foam structure of the wave-absorbing foam layer with the double-foam structure is resin foam and pure electromagnetic matrix foam; the wave-absorbing adhesive film is a resin adhesive film added with a magnetic wave-absorbing agent or a dielectric wave-absorbing agent; and the resin adhesive film layer and the wave-absorbing adhesive film layer are made of the same resin. The invention also discloses a preparation method and application thereof. The wave-absorbing foam prepreg adhesive film provided by the invention has the advantages of good surface integrity, controllable adhesive film thickness, strippable processing, good resin processability, strong electromagnetic wave absorption capability, excellent use performance and wave-absorbing performance, and can be applied to the fields of aerospace, communication, electronic equipment, confidential building materials, shoe rubber soles and the like.

The invention provides a chip attenuator and a preparation method thereof, and belongs to the technical field of attenuators. The resistance layer comprises a first resistor, a third resistor and a second resistor which are sequentially connected in series, a fourth resistor and a sixth resistor which are connected in parallel between the joint of the first resistor and the second resistor and the ground, and a fifth resistor and a seventh resistor which are connected in parallel between the joint of the second resistor and the third resistor and the ground, and the resistance value of the first resistor is equal to that of the second resistor; the resistance value of the third resistor is the sum of the resistance value of the first resistor and the resistance value of the second resistor, and the resistance values of the fourth resistor, the fifth resistor and the seventh resistor are equal. The chip attenuator manufactured by the invention can meet the requirements of miniaturization, high attenuation and wide frequency band.

This utility model relates to the field of bridge technology and discloses a damping and vibration-damping multi-directional displacement comb-plate bridge expansion joint, including the main bridge side and the approach bridge side. This damping and vibration-damping multi-directional displacement comb-plate bridge expansion joint is equipped with a fixed frame, a fixed box, a disc spring assembly, a wear-resistant sleeve, a sphere, threaded holes, a mounting groove, a pad, and fixing bolts. Through the cooperative design of the wear-resistant sleeve and the sphere, the sphere can rotate freely within the wear-resistant sleeve. The threaded holes on its inner wall facilitate connection with the fixing bolts. When the fixed comb plate undergoes angular displacement, the rotation of the sphere and the elastic deformation of the disc spring assembly work together to effectively disperse stress and avoid localized stress concentration in the comb plate. Compared to existing technologies that rely solely on the elastic deformation of the disc spring assembly to achieve angular displacement, this device can better adapt to the longitudinal, lateral, and vertical composite deformations generated by bridges under complex working conditions, greatly reducing the risk of component damage.

The invention discloses a thermally-induced rigidity-variable high-performance mounting bracket and a control method thereof, relates to the technical field of vibration reduction equipment, and aims to solve the technical problem that an existing vehicle-mounted motor vibration reduction bracket cannot be adaptively adjusted along with temperature change. Through the TiNiNb shape memory alloy pull column, temperature self-adaption rigidity switching, low-temperature rigidity fixing impact resistance and normal-high-temperature flexible vibration reduction are achieved, and vibration characteristics of different temperature ranges of the motor are adapted; the vibration buffering gasket is matched with the air damping mechanism to form double vibration reduction, and the high-frequency broadband vibration attenuation effect is greatly improved through the triple damping effect; the ventilation air bag realizes forced air circulation by means of motor vibration, vibration reduction heat is quickly discharged, and high-temperature vibration reduction stability is guaranteed; the vibration wave mechanism is matched with the one-way shaft ring, vibration is converted into reverse rotation force of the radial vibration buffering ring, eccentric radial vibration force of the rotor is counteracted from the source, and accurate radial vibration reduction is achieved.

The utility model relates to a kind of wave-absorbing assembly and electromagnetic darkroom, belong to the technical field of electromagnetic compatibility test.It solves electromagnetic darkroom wave-absorbing efficiency and maintenance problem by grid-shaped arrangement modular unit;Specifically, each absorbing unit adopts split design: the first wave-absorbing part is fixed on the substrate, and the replaceable second wave-absorbing part with wedge shape is connected vertically above the first wave-absorbing part through interference fit convex-concave structure;Annular wave-absorbing cavity with built-in concave-convex surface is formed between adjacent units, forcing multi-path reflection attenuation of gap electromagnetic wave.The utility model is combined with the grid substrate of shielding wall integrated molding and configures absorbing unit on the substrate, realizes efficient absorption of electromagnetic wave and local replacement of wedge body, significantly reduces secondary reflection and maintenance cost.

The application discloses a glass frit for a single-crystal silicon solar cell front paste, a paste, and a single-crystal silicon solar cell. The glass frit comprises 1-30 mol% of lithium oxide, 5-40 mol% of bismuth oxide, 5-40 mol% of lead oxide, 1-40 mol% of silicon oxide, and X, wherein X is any one or a mixture of several of copper oxide, cesium oxide, rubidium oxide, sodium oxide, potassium oxide, aluminum oxide, magnesium oxide, strontium oxide, tin oxide, zinc oxide, or tungsten oxide, and the molar content of any one of the oxides in X is 1-10 mol%, and the content of X is not more than 50 mol%. The conductive paste prepared by using the glass frit contains a lead-bismuth-silicon oxide glass system, the system has enhanced resistance to acetic acid attenuation, ensures a sintering window at a high-temperature fast-firing sintering temperature, and X has strong corrosiveness, so that a lower contact area can be obtained. The conductive paste has high resistance to acetic acid in a wide sintering window.

The invention relates to the technical field of connector connection, in particular to an impedance-adjustable test connector which comprises a shell, an outer conductor and a first center conductor arranged on the shell and further comprises an insulation supporting piece arranged in the shell, a first resistor and a second resistor are arranged on the insulation supporting piece, the first resistor is electrically connected with the first center conductor, and a switch is arranged on the shell. The second center conductor comprises a fixing disc arranged on the insulating supporting piece, a rotating disc is rotationally installed on the fixing disc, a clockwork spring is arranged between the fixing disc and the rotating disc, an arc-shaped guide groove is formed in the rotating disc, a guide disc is arranged on the fixing disc, a guide straight groove is formed in the guide disc, and an extrusion piece is elastically installed on the guide disc. Each clamping claw comprises a clamping plate slidably mounted on the guide disc, a guide column is arranged on the clamping plate, a wavy conductive part is slidably mounted at the bottom of the clamping plate, and a reset assembly used for preventing the wavy conductive part from excessively deforming is arranged at the top of the clamping plate. Impedance testing can be conveniently carried out on the cable, and attenuation of the tested cable is more accurate.

The invention provides an organic compound and application thereof, the organic compound has a structure as shown in formula I. Through the design and mutual compounding of a boron-nitrogen multi-resonance mother nucleus structure and a specific anthracene-containing group RX, the narrow emission spectrum and high luminous efficiency of a multi-resonance material are maintained, and the luminous efficiency of the organic compound is improved. And the purposes of adjusting the light color and reducing the triplet state energy level are also achieved. The organic compound has excellent electroluminescent performance, narrow spectrum characteristic and thermal stability, is used for the organic electroluminescent device, can be used as a fluorescent doping material of a luminescent layer, effectively improves the service life attenuation and the efficiency roll-off of the device, improves the luminous efficiency of the device, prolongs the service life of the device, and enables the device to have higher color purity.

The application provides a bus driver structure and a control method, which comprise: a high-side drive circuit; the high-side drive circuit is connected between a power supply and a load. The high-side drive circuit comprises: a high-side first transistor, a high-side second transistor and a high-side reverse current blocking unit; the gate of the high-side first transistor and the gate of the high-side second transistor are respectively connected to a high-side gate control unit; the drain of the high-side first transistor is connected to the power supply, and the source of the high-side first transistor is connected to the positive electrode of the high-side reverse current blocking unit; the drain of the high-side second transistor is connected to the negative electrode of the high-side reverse current blocking unit, and the source of the high-side second transistor is a high-side signal end; and the high-side signal end is used for directly or indirectly connecting the load. The bus driver structure can solve the problems of complex control circuit, high cost and slow overcurrent protection reaction speed in the prior art.

The present invention discloses a solar cell with a composite dielectric passivation layer structure and a preparation process thereof, wherein a silicon oxide film, an aluminum oxide film, a silicon nitride or a silicon oxynitride film composite dielectric film layer are sequentially deposited on the front, back and peripheral surfaces of a P-type silicon substrate, and a window is opened locally for electrode extraction. The back surface passivation layer of aluminum oxide, silicon dioxide, silicon oxynitride, silicon nitride with different refractive indices and their laminated structures of the present invention greatly reduces the back surface recombination rate, improves the back reflectivity, and simultaneously reduces the component CTM, improves the cell light decay and thermally assisted light decay performance, and anti-PID performance; the structure can be made on boron-doped or gallium-doped P-type monocrystalline silicon, P-type polycrystalline silicon and P-type quasi-monocrystalline silicon substrates, and is compatible with the passivation method based on the composite dielectric film passivation structure for manufacturing PERC cells, double-sided PERC+ cells and shingled PERC cells; the preparation process steps and sequence of the laminated structure, the corresponding preparation method and the process parameter range can well complete the cell production.

The present invention relates to the technical field of shielded network cables, and specifically discloses a 6A double aluminum foil shielded network cable, the shielded network cable comprises a cable body, the cable body comprises a plurality of twisted pairs; each twisted pair comprises two core wires twisted together and a shielding layer sequentially wrapped around the two core wires; each core wire comprises a conductor and an insulating layer wrapped around the conductor. The double aluminum foil shielded network cable of the present invention adopts a plurality of twisted pairs of wires that are in contact with each other, and the plurality of twisted pairs of wires are in contact with a ground wire to form a cable body, a total shielding layer is coated around the outer periphery of the cable body, and an outer sheath is arranged around the outer periphery of the total shielding layer, and the outer sheath and the insulating layer are made of modified polymer materials, thereby optimizing the overall mechanical properties of the network cable product, the coordinated improvement of the attenuation performance, and the cold resistance and corrosion resistance stability are remarkable.

The application discloses a kind of unmanned vehicle remote sensing water pollution evaluation methods of fusion multispectral feature, belong to water pollution evaluation field, the system includes obtaining multispectral image data, obtain the multispectral image data after pre-processing;Based on the multispectral image data after pre-processing, the reflectivity of each band and characteristic spectral index of target water area are extracted;Based on the reflectivity of each band, construct uneven illumination correction factor and residual interference suppression factor;The core spectral feature is corrected using uneven illumination correction factor and residual interference suppression factor, and a water pollution evaluation quantitative model is constructed based on the corrected core spectral feature;The quantitative value calculated using the water pollution evaluation quantitative model, and the water pollution grade division threshold value preset, obtain the pollution evaluation grade of target water area.The application solves the problems of small coverage, insufficient feature utilization, weak anti-interference ability and unquantifiable pollution grade in existing water pollution monitoring technology.

The invention discloses a social network user emotion propagation model based on a game theory, and aims to overcome the technical defect that an emotion propagation model cannot accurately describe a real emotion propagation process in the existing emotion analysis and propagation simulation work in the prior art. According to the technical scheme provided by the invention, a model construction method of the social network user emotion propagation model based on the game theory comprises the following steps: performing emotion analysis on a target user node according to a preset emotion analysis method, and extracting an emotion label of the node; constructing an emotional game income matrix according to the emotional label of each node; adjusting the basic propagation probability in the SIR infectious disease model according to the emotional game income matrix; according to the social enhancement effect, the basic immune probability in the SIR infectious disease model is adjusted; and adjusting the structure of the SIR infectious disease model according to a forgetting mechanism to obtain a social network user emotion propagation model. The method is suitable for sentiment analysis and propagation simulation work.

The utility model discloses a filter for medical frequency converter, including connector J1 and connector J2, the one foot of connector J1 is connected respectively piezo -electric resistance MOV1, piezo -electric resistance MOV3, inductance L1 one foot, electric capacity C2 and electric capacity C3, piezo -electric resistance MOV1 other end connects inductance L1 three feet, piezo -electric resistance MOV3 other end connects gas discharge tube and piezo -electric resistance MOV2 respectively, gas discharge tube ground connection, piezo -electric resistance MOV2 other end connects inductance L1 three feet, electric capacity C2 other end connects electric capacity C1, electric capacity C1 ground connection, electric capacity C3 other end ground connection, inductance L1 two feet connects electric capacity C5, electric capacity C4, resistance R1 and inductance L2 one foot respectively, electric capacity C4 other end ground connection, resistance R1 other end connects electric capacity C10, electric capacity C10 ground connection, electric capacity C5 other end connects inductance L1 four feet.

A structure for improving steering stability comprises a front axle, a fixing support A, a fixing support B and a steering shock absorber, the fixing support B is installed on the left side of the front axle and connected with the lower end of the front axle through the fixing support A. The middle portion of the fixing support A is connected with one end of the steering shock absorber. And the other end of the steering shock absorber is connected with a fixed bracket B. According to the non-independent steering system, self-excitation shimmy of the steering wheels of the automobile is prevented by utilizing the characteristics of the steering shock absorber, the transient shimmy of the steering wheels caused by road impact is also strongly attenuated, and braking deviation is prevented. The torque fluctuation of the steering wheel end is obviously reduced, the hand feeling is good, and the controllability is enhanced.

The invention provides a sound insulation wall material which comprises a porous layer, an air cavity layer and a composite cavity layer, the porous layer is a polyurethane foam composite electrostatic spinning layer, the air cavity layer is an aerogel layer with one-way orientation, the composite cavity layer is an aerogel layer with one-way orientation, and the porous layer is a polyurethane foam composite electrostatic spinning layer. Micro-nano hollow particles are loaded in the aerogel, a porous layer and a composite cavity layer are arranged on the two sides of the air cavity layer respectively, the thickness of the porous layer is 3-6 mm, the thickness of the air cavity layer is 5-8 mm, and the thickness of the composite cavity layer is 3-5 mm. The composite mode of the sound insulation wall material is a porous-resonance composite material, and the sound absorption effect on the low-frequency position is improved.

The present invention provides a high-damping composition which has good processability and is capable of forming a viscoelastic body having excellent damping performance and little temperature dependency of the damping performance, and a viscoelastic damper which comprises a viscoelastic body formed from the high-damping composition, and is installed in a building and the like for use. A high attenuation composition is blended with silica and an OA-containing rosin derivative in a base polymer. The viscoelastic shock absorber comprises a viscoelastic body (1) formed from the high damping composition.