226 results about "Noise barrier" patented technology

The invention relates to a cement-matrix sound-absorption material used in road noise barriers and a preparation method thereof; the sound-absorption material is a noise barrier material which can be used in airports, high-speed railways, expressways, urban viaducts, subways and light rails; the components and weight ratios are as follows: 15.4 to 62.3 percent of Portland cement, 0.1 to 15.7 percent of mineral admixture, 18.9 to 79.9 percent of lightweight porous aggregate, 0.013 to 0.078 percent of foaming agents, 0.1 to 0.7 percent of water reducing agent and 0.4 to 2.6 percent of fiber. The sound-absorption material and the preparation method thereof have the advantages of large sound absorption coefficient, high strength, good anti-impact performance, excellent durability, fire resistance, moisture resistance, anti-corrosion and self-clean function; at the same time, the sound-absorption material is wide in sources of raw materials, convenient in preparation and processing, suitable for large-scale production, low in cost, environment-friendly and good in decorativeness.

An image sensor element includes a vertical overflow drain structure to eliminate substrate charge diffusion causing CMOS image sensor noise. An extra chemical mechanical polish step used to shorten the micro-lens to silicon surface distance in order to reduce optical cross talking. One embodiment uses N type substrate material with P− epitaxial layer to form a vertical overflow drain. Deep P well implantation is introduced to the standard CMOS process to prevent latch-up between an N well to an N type substrate. A photo diode is realized by stacked N well / Deep N well and stacked P well / Deep P well to improve performance.

The present invention provides a noise barrier apparatus for inhibiting external noise from causing the presence of noise in an audio chamber defined by a noise barrier device and including the user's ear canal. The noise barrier apparatus may be constituted by an in-ear noise barrier device or devices or an over-the-ear device or devices. An in-ear application of the present invention provides an in-ear-canal audio receiver comprising an in-ear-canal adapter body having a tapered ear plug portion that is inserted into the user's ear canal. The adapter body further has an opening in the plug portion, an exterior annular indent, and an inner chamber coupled to the opening of the plug portion. The inner chamber of the in-ear-canal adapter body holds a transducer assembly comprising a transducer housing and a transducer or speaker. The transducer is positioned in a passage extending through the transducer housing. A torus-shaped cushion is positioned in the annular indent of the in-ear-canal adapter body. The cushion provides comfort and establishes a good seal with the user's ear, and also provides mechanical damping to inhibit propagation of external acoustic pressure waves via the noise barrier device to an audio chamber including an interior of the noise barrier device and the user's ear canal. An over-the-ear application of the present invention provides an ear cup and has a torus-shaped cushion at an interface part thereof which bears against the side of the user's head at an area surrounding the user's ear. The cushion again provides comfort, establishes a good seal with the user's head and provides mechanical damping to inhibit propagation of external acoustic pressure waves via the noise barrier device to an audio chamber including an interior of the noise barrier device and the user's ear canal. The cushion is preferably formed of a material which is at least partially plastically deformable and provides a damping ratio greater than 0.75.

The invention discloses a rubber reinforced cement functional composite material and a preparation method thereof. The rubber reinforced cement functional composite material is prepared from waste rubber and cement or cement mortars by the following steps of: applying coupling adhesives to surfaces of waste rubber grains and / or powder by using coupling agents; mixing the waste rubber grains and / or powder with the cement or the cement mortars; adding water into the rubber-cement mixed materials for uniform stirring, and performing pavement, pressing, demoulding and maintaining to obtain the functional composite material product having a high mechanical strength and endurance. The composite material has the characteristics of noise reduction, sound isolation, high impact resistance, damping vibration attenuation, wear resistance, static resistance, water resistance and the like, has the advantages of insulation, environmental protection and the like and can be used in the field of functional materials, such as buildings, roads, railways, tunnels, noise barriers and the like. The functional composite material and the method thereof also provide a new way for solving the global problem of 'black pollution' of increasing waste tyres and have a wide application prospect.

A foam barrier heat shield is provided having a layer of foam adhesively disposed between opposing first and second metallic outer layers. The foam is expanded in between the outer layers and is adhesively formed to the outer layers without the use of a separate adhesive. In addition to shielding heat, the heat shield is effective as a noise barrier and is internally damped against vibration. In a preferred embodiment, the foam is a substantially rigid polyurethane foam that is sufficiently pliant to be bent to and accommodate a particular shape and contour to which the heat shield will conform in use, and it is reversibly deformable acoustical deflections.

The invention discloses a wood plastic substrate of a highway noise barrier, which is characterized by consisting of the following components in part by weight: 70 to 90 parts of wood fiber, 90 to 110 parts of plastics, 0.5 to 0.8 part of calcium stearate, 0.2 to 0.4 part of antioxidant, 0.2 to 0.4 part of ultraviolet resistant absorbent, 20 to 30 parts of inorganic particle and 0.2 to 0.4 part of flame retardant. The noise barrier manufactured by using the wood plastic substrate has the characteristics of weathering resistance, no crazing and cracks, low contractility or expansibility and freeness from the damage of molds or white ants. In addition, the wood plastic substrate of the highway noise barrier can be recycled so as to be safe and environmentally-friendly.

The invention relates to a component used in a railway, in particular to a high-speed railway noise barrier which comprises an H-shaped steel metal upright column, a precast concrete sound absorbing plate which is inserted into the H-shaped steel metal upright column, a transparent sound insulation plate installed above the precast concrete sound absorbing plate and an arc sound absorbing top part arranged at the top part of the transparent sound insulation plate. The high-speed railway noise barrier with the arc sound absorbing top part structure can efficiently absorb the noises of a high-speed railway train wheel rail, aerodynamic force of a train body and the like and prevent the noises from spreading to both sides of a line; and an insertion plate of a precast prestressed concrete unit at the lower part has no tensile stress under the load, thereby efficiently preventing the insertion plate from cracking and achieving the advantages of good anti-fatigue performance and durability, and the sound absorbing insertion plate of the prestressed concrete noise barrier has a low manufacturing cost and is convenient for installation and replacement. The high-speed railway noise barrier is suitable for places which have high requirements for noise isolation, such as urban regions, schools, hospitals, residential areas and the like.

The invention discloses a red mud porous material. In order to solve the problem of discharge of red mud, the invention adopts a synthetic technology of chemically bonded ceramics and a chemically entraining technology; and according to the invention, the porous material is prepared from red mud serving as a part of raw material of a synthetic material, as well as solid water glass, slags, coal ash, a foam stabilizer, water and a foamer. The porous material has the advantages of uniform aperture, light weight, good insulating property, low water absorption, high strength, high percentage of close area, environment-friendliness, high solid waste utilization rate and the like, and the percentage of close area of the prepared red mud porous material is over 95%, the dry density is 450-700kg / <m3>, the heat conducting coefficient can be lower than 0.13w / mk and the fire protection ability can reach 4 hours, so that the material can be widely applied to aspects such as chemical engineering, heating and heat insulating, building energy conservation, indoor sound isolation and noise barriers for expressways.

A screw compressor for acoustic resonance reduction and refrigeration systems including the screw compressor are disclosed. The screw compressor has an acoustic barrier integral with the compressor housing for use with a slide valve assembly that includes a piston connected to a slide valve. A shaft connecting the slide valve and the piston passes through an aperture in the barrier with the piston and the slide valve disposed on opposite sides of the barrier. The acoustic barrier protects the piston from discharge pulses of compressed fluid exiting the rotors of the screw compressor, thus attenuating acoustic resonance, reducing compressor noise and premature wear of the slide valve assembly and compressor housing.

The invention discloses a feed-forward active noise barrier, which comprises a passive noise barrier and a single-channel feed-forward active control system array. Each single-channel feed-forward active control system forming the array comprises a reference microphone, an error microphone, a secondary sound source and a single-channel controller. The secondary sound sources are arranged on the top of the passive noise barrier. The reference microphones are positioned on one side of a noise source and close to the top of the barrier. The error microphone is positioned on one side of an observation point and close to the top of the barrier. The controller of each single-channel feed-forward active control system is used for controlling the output of the corresponding secondary sound source so as to minimize a square value of sound pressure amplitude at the position of the corresponding error microphone, and adopts a feed-forward single-channel adaptive control algorithm. Each single-channel control system is compact, has low cost and is easy to implement. The problems of high implementing difficulty and high cost when a multi-channel control system is used are solved. Compared with the conventional feedback active noise barrier, the feed-forward active noise barrier has high system stability and a good control effect and does not have a water bed effect due to the adoption of the feed-forward control systems.

A composite membrane of wood floor diaphragm for construction of new buildings and strengthening of existing buildings to provide improved load transfer capacity and enhanced resistance to gravity and lateral loads, such as earthquake and / or wind for buildings with wood floor framing. The aforementioned composite membrane is a system, comprised of four-way interlocking mosaic end grain parquet floor attached to a plywood subfloor beneath. A floor to floor sound blocking barrier that can operate in high eighty decibel and above range may preferably be installed under the subfloor.

A traffic noise barrier system includes a longitudinal barrier and a traffic noise barrier wall. The traffic noise barrier wall is supported by the longitudinal barrier and is spaced apart from a back surface of the longitudinal barrier in a direction away from the path of traffic. Transverse beams attach the longitudinal barrier to the noise barrier wall, and a structure may be placed across the transverse beams for catching debris. Each panel in the plurality of panels may be interconnected by a cable to an adjacent panel or an upstanding post, and each post may be interconnected by a cable and / or bar. The traffic noise barrier wall is preferably positioned at a distance greater than about 18 inches from a front surface of the longitudinal barrier, and more preferably is positioned at a distance greater than about 34 inches from the front surface.

The invention relates to a plant noise barrier, which comprises a bracket upright column (4), wherein one or more plant cultivation boxes (2) are fixed on the bracket upright column (4); a plurality of sound insulation fins (3) are arranged outside the plant cultivation boxes (2); and an inclined angle is formed between each sound insulation fin (3) and the horizontal plane. The plant noise barrier has the effects of beautifying roads, preventing visual fatigue and absorbing carbon dioxide and harmful gases, can insulate sound and reduce noise by coacting the sound insulation fins and complexoverlapped plant stems and leaves, greatly reduces automobile and other noise pollution, and has better sound insulation and noise reduction effects than the traditional single noise barrier. Moreover, because each sound insulation fin has a noise reduction structure and is more effective than a wall which insulates sound and reduces noise through plants singly, the defects that the wall hardly has sound insulation and noise reduction effects in the absence of plants are overcome.

The invention discloses a rail holding type electromagnetic suspension track traffic box girder. The box girder comprises a top plate, a bottom plate and a web plate located between the top plate and the bottom plate. The top plate, the bottom plate and the web plate are of a reinforced concrete structure formed by overall pouring, an outer protrusion and a boss allowing an electromagnetic suspension track to be mounted are arranged at the two side ends of the top plate, and wing plates which stretch out towards the upper inclined portion are arranged on the two sides of the bottom plate. A mounting platform is arranged at the top ends of the wing plates, the mounting platform is of a boss structure which stretches out towards the outer side in the horizontal direction, can be used for arranging a pedestrian footpath and an evacuation exit and also can be used for arranging track traffic accessory facilities such as an inspection gallery, guardrails, a noise barrier, a signal machine and an AP antenna, and daily maintenance of a line is facilitated. The wing plates of the box girder shield on-bridge tracks, trackside equipment, cables and the like, and the landscape effect is obviously improved.

A noise structure having a barrier made of a generally sound redirecting material defining a surface of the barrier, and a plurality of sound absorbing boxes connected to this surface, each box comprising a rear wall and an extensively perforated front wall, the walls defining a longitudinal channel at least partially occupied by a filling made of a sound absorbing material, in which the rear wall is a substantially flat plane wall assembled parallel to and spaced apart from the surface of the barrier and is in its turn extensively perforated.

An object of the present invention is to provide a transparent noise-barrier wall which is slow to foul, easy to clean even when fouled, and capable of maintaining these effects over a long period of time. The transparent noise-barrier wall has brookite titanium dioxide substantially existing on the surface. The titanium dioxide particles preferably contain about 20% by mass or more of brookite titanium dioxide.

The invention relates to an acoustic barrier especially used for high speed railway. The acoustic barrier comprises multiple acoustic insulation components (2); the acoustic insulation components (2) comprises a plate shell (3) having an acoustic insulation liner (4) and a hollow transverse section crossing the longitudinal axis (5). The surrounding walls (6, 7, 8, 9) of the plate shell (3) consist of at least on plate (10, 11) formed by folding the hollow transverse section.

The invention discloses an acoustic design method for road noise barrier, which comprises the steps of: 1) importing a vector diagram with a Cad format for characterizing the terrains of noise barrier or grid maps with formats such as jpg, bmp, tif, and the like; 2) calibrating the imported graph to achieve the consistence of graphic proportion and actual proportion; 3) combining the actual situation to draw entities such as roads, terrains, houses, forests, grasslands, and the like based on the importing of the graph, and adopting a batch conversion function to finishing the basic work of acoustic modeling by adopting a batch conversion function if the graph is a Cad graph; 4) setting a noise prediction point at a protected sensitive point, calculating a noise value when no barrier exists, and determining an noise-reducing index of the barrier; 5) simulating the noise barrier, adjusting the height and the length of the barrier, and preliminarily calculating a geometrical dimension of the barrier which meets the requirement; and 6) re-calculating the noise-reducing effect of the barrier by combining the geometrical dimension of the sound barrier and simulating the barriers with different structures and sound absorption coefficients until the combination of the geometrical dimension, the structure and the sound absorption coefficient of the sound barrier which meets the requirement is calculated.

The invention discloses a drilling machine for drilling a hole in a polishing machine shell. The drilling machine comprises a base, wherein the top end of the base is fixedly connected with the bottom end of a support rack; a servo motor is fixedly mounted at the top end of the support rack; a sleeve box is fixedly connected to one side surface of the servo motor; one end of the output shaft of the servo motor penetrates and extends into the inner chamber of the sleeve box, and is fixedly sleeved by a transmission gear; the outer edge of the transmission gear is meshed with the inner side of a chain; one end of the chain penetrates and extends into the top end of the support rack and is mutually meshed with the outer edge of a positioning gear; and a driven gear above the positioning gear is meshed with the middle of the chain, and is movably mounted in one end of a lifting table. According to the drilling machine, a noise reduction device can effectively isolate impurities generated in machining, so that the impurities and dust can be prevented from splashing all around to influence the work environment, and the cleaning is facilitated; and a noise barrier is adopted for lowering noise generated in machining, so that the machining environment is improved.

The present invention provides a noise reduction structure of an outdoor unit of a large-sized air conditioner. The outdoor unit of the large-sized air conditioner of the present invention is provided with a constant-speed converter and an inverter converter for compressing a refrigerant so as to circulate the refrigerant through a refrigerating cycle to variably change air-cooling capacity of the air conditioner. In the outdoor unit, an anti-noise barrier provided with protrusions surrounds the inverter compressor, thereby preventing noise generated from the inverter compressor from being transmitted to the outside.

The invention discloses a noise barrier which comprises a plurality of columns and a plurality of wall plates which are arranged between the adjacent columns and are connected up and down, wherein a curved plate is arranged on the topmost wall plate; each wall plate is formed by arranging a noise absorbing plate between two noise insulation plates. According to the noise barrier, the noise is eliminated by using a way of insulation-absorption-insulation, and the effect is more ideal than the traditional single noise insulation or absorption effect.

The invention discloses a ribbed prestressed concrete plate type noise barrier unit plate. The noise barrier unit plate comprises a back plate and an overlapping layer, wherein the back plate is a ribbed concrete sheet made of high-strength concrete, the overlapping layer is formed by adhering a sound absorption material of light volcanic rock to one side of the back plate, the overlapping layer and the back plate are integrally poured to form an overlapping type component, the back plate is rectangular, end ribs are arranged at upper ends of long edges of the back plate respectively, prestressed wires are arranged in the end ribs at the upper and lower ends respectively, and side end ribs are arranged on two sides of short edges and equipped with constructional steel bars. According to the ribbed prestressed concrete plate type noise barrier unit plate, in the process of bearing aerodynamic force of high-speed railways, the production of fatigue stress and cracks can be avoided, the sound absorption coefficient is very high, the production cost is low, and the unit plate is adapted to the rapid development of high-speed railways.

An aircraft having reduced environmental impact includes at least one engine with at least one propeller carried, at the rear, on the top of the aircraft with the propeller(s) located in vertical alignment with the rear part of a noise barrier cell and the rear face of a burst zone situated forward of the central part of an empennage box.

The invention discloses a multi-channel active noise control system. The multi-channel active noise control system comprises a multi-channel active controller, a vibration sensor / reference sensor, a near-field error sensor array, a secondary sound source loudspeaker array and a remote control microphone array, wherein the secondary sound source loudspeaker array and the near-field error sensor array are distributed in a region, in which noises of large-sized equipment need to be controlled, so as to form a virtual noise barrier; the secondary sound source loudspeaker array is arranged on the internal side of the virtual noise barrier; the output of the secondary sound source loudspeaker array is controlled by the multi-channel active controller; the multi-channel active controller is connected with the vibration sensor / reference sensor, the near-field error sensor array, the secondary sound source loudspeaker array and the remote control microphone array; and as an open noise reducing facility, the control system disclosed by the invention has the advantages of no influence from field mounting space, good noise reducing performance, no burden increased to ventilation and heat radiation of the large-sized equipment, no influence on maintenance of the equipment, simple structure, convenience in use and convenience in promotion and application.

The invention discloses a dynamic traffic flow based forecast method of noise in the peripheral zone of a long straight road. According to the method, a microcosmic moving trajectory of a vehicle in a road section is defined accurately, a vehicle source emission model is established, a noise transmission model is established simultaneously, and a complete set of noise forecasting method is obtained. The forecast method comprises steps as follows: (1), dynamic traffic flow simulation vehicle models at a forecast location are classified, and a dynamic traffic flow simulation model is established; and (2), reference radiation sound levels of different vehicle models are determined, meanwhile, traffic composition, range attenuation and noise barrier insertion loss are considered to calculate forecast sound level of the noise, and the forecast sound level is amended with consideration of surface roughness, the slope and the roadside ground type. According to the forecast method, limitation of the conventional noise forecast method is broken through on the basis that correlation research ideas of other subjects are absorbed sufficiently, and the sound level of the noise in a sensitive area can be forecast accurately.

The invention relates to a perforated glass plate and various types of structures using the same. The invention adopts a technical scheme that: the perforated glass plate is provided with small holes penetrating the perforated glass plate in the thickness direction and evenly distributed in the direction of plane, the percentage of open area is between 0.5 and 30 percent, and the small holes are round or polygonal; and the structures using the perforated glass plate comprise windows of a building using the perforated glass plate, automobile windows using the perforated glass plate, fences using the perforated glass plate, noise barriers using the perforated glass plate, totally closed structures of traffic aisles using the perforated glass plate and windshields using the perforated glass plate. The perforated glass plate has the advantages of breathability, contribution to air circulation, sound absorption effects of a perforated plate and a micro perforated plate, certain sound insulating effect and effects of shielding wind, wind pressure reduction and rainproof and theft protection effects. The structures using the perforated glass plate are suitably used for windows or glass curtain walls of buildings, automobile windows, fences, sound barriers, closing structures of a communication passage, and windshields.

A co-injection molded air intake manifold shell comprises an inner and outer skin layer separated by a sound absorbing or sound insulation core. Each skin layer is composed of a polyamide resin which, optionally, contains glass fiber reinforcement and high specific gravity fillers such as barium sulfate or tungsten. The sound insulating core is composed of a high density material having a foam structure, such as a polyamide resin. Skin layers are provided with a plurality of pockets to permit distribution of localized lumped masses at predetermined locations tailored to increase noise transmission losses. A single layer air intake manifold shell having non-uniform thickness is also provided. The thickness of the single layer air intake manifold shell is larger over preselected noise sources of larger amplitude to maximize noise attenuation for a nominal air intake manifold shell thickness.

A noise barrier is described having noise barrier panels capable of being moved by the force of wind from a dosed to an open position to allow passage of wind, so that the noise barrier has limited wind load. The noise barrier can be light weight because wind load on the noise barrier is limited. This provides that the noise barrier is easy to erect, possibly without requiring heavy machinery. The noise barrier panel is mounted on a mounting pole to be slide-able on the mounting pole, so that the noise barrier panel can be pushed from ground up.